A heat exchanger is a device that transfers heat between two or more fluids. There are several types of heat exchangers, including parallel-flow, counter-flow, cross-flow, double pipe, shell and tube, plate, and spiral. Heat exchangers are widely used in applications like heating, cooling, chemical processes, and power generation to efficiently exchange heat between fluids. Proper selection and maintenance of heat exchangers depends on factors such as temperature ranges, pressure, materials, fouling potential, and cleanability.
Single and multiple effective evaporator (mee)Sumer Pankaj
A multiple-effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water.[1] In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. Because the boiling temperature of water decreases as pressure decreases, the vapor boiled off in one vessel can be used to heat the next, and only the first vessel (at the highest pressure) requires an external source of heat. While in theory, evaporators may be built with an arbitrarily large number of stages, evaporators with more than four stages are rarely practical except in systems where the liquor is the desired product such as in chemical recovery systems where up to seven effects are used.
The multiple-effect evaporator was invented by an African-American inventor and engineer Norbert Rillieux. Although he may have designed the apparatus during the 1820s and constructed a prototype in 1834, he did not build the first industrially practical evaporator until 1845. Originally designed for concentrating sugar in sugar cane juice, it has since become widely used in all industrial applications where large volumes of water must be evaporated, such as salt production and water desalination.
Multiple effect evaporation commonly uses sensible heat in the condensate to preheat liquor to be flashed. In practice the design liquid flow paths can be somewhat complicated in order to extract the most recoverable heat and to obtain the highest evaporation rates from the equipment.
Multiple-effect evaporation plants in sugar beet factories have up to eight effects. Six effect evaporators are common in the recovery of black liquor in the kraft process for making wood pulp.
This document discusses ice cream freezers and their functions. It describes the factors that influence freezing time and the different types of freezers, including batch and continuous freezers. Batch freezers freeze ice cream in batches using a cylindrical drum with an inner cooling jacket. Continuous freezers continuously pump and freeze the ice cream mix using systems like disk type, Vogt jet, or creamey package freezers to freeze and aeriate the mix. The document provides details on the construction, working principles, and types of both batch and continuous ice cream freezers.
Mass and energy balances must be completed for each piece of equipment before detailed design can begin. A mass balance is done for each unit shown on the process flowsheet, while an energy balance is done over groups of units where energy is transferred between process fluids. Even at the design stage, some flowrates and temperatures may only be estimates. The mass and energy balances will need updating after detailed design is complete. Calculations are included as an appendix and provide details like mass flowrates, compositions, temperatures, pressures, and enthalpy contents of all streams.
The document discusses different types of moisture measurement and their applications. There are several common methods for measuring moisture content, including drying methods like thermogravimetric analysis and oven drying, the Karl Fischer titration method, dielectric and infrared absorption techniques, and neutron analysis. Each method has advantages and limitations depending on the material and desired accuracy. Understanding moisture content is important for many industries as it can impact material properties and quality control.
This document provides information on the design of freezers and cold storages. It discusses the three main methods of freezing food: air blast, contact/plate, and immersion/spray. It describes the design and types of air blast, plate, liquid nitrogen, carbon dioxide, and immersion freezers. It also covers the classification, construction, insulating materials, types of loads, and vapor barriers used for cold storages. The document is an educational text providing technical details on freezer and cold storage design.
Advance in mass transfer in food applicationDayanand Raj
This document discusses advances in mass transfer processes for food applications. It begins by defining mass transfer and providing examples such as evaporation, absorption, and distillation. The fundamentals of mass transfer are then explained, noting that concentration gradients provide the driving force for mass to move between phases. Several key mass transfer operations for separating mixtures are described in detail, including distillation, gas absorption, dehumidification, liquid extraction, leaching, and drying. A variety of industrial and food processing applications that employ these operations are also outlined.
This document provides information on different types of heat exchangers:
- Multiple pass heat exchangers allow fluids to pass each other more than once using U-bend tubes or shell-side baffles, improving heat transfer.
- Plate heat exchangers use corrugated metal plates separated by gaskets to transfer heat between fluids in alternating channels. They are compact and efficient.
- Scraped surface heat exchangers have an internal rotating cylinder fitted with blades that continuously scrape the heating surface, used for viscous fluids.
- Double pipe heat exchangers consist of two concentric pipes for countercurrent flow, used in boilers, coolers, condensers and evaporators.
A heat exchanger is a device that transfers heat between two or more fluids. There are several types of heat exchangers, including parallel-flow, counter-flow, cross-flow, double pipe, shell and tube, plate, and spiral. Heat exchangers are widely used in applications like heating, cooling, chemical processes, and power generation to efficiently exchange heat between fluids. Proper selection and maintenance of heat exchangers depends on factors such as temperature ranges, pressure, materials, fouling potential, and cleanability.
Single and multiple effective evaporator (mee)Sumer Pankaj
A multiple-effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water.[1] In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. Because the boiling temperature of water decreases as pressure decreases, the vapor boiled off in one vessel can be used to heat the next, and only the first vessel (at the highest pressure) requires an external source of heat. While in theory, evaporators may be built with an arbitrarily large number of stages, evaporators with more than four stages are rarely practical except in systems where the liquor is the desired product such as in chemical recovery systems where up to seven effects are used.
The multiple-effect evaporator was invented by an African-American inventor and engineer Norbert Rillieux. Although he may have designed the apparatus during the 1820s and constructed a prototype in 1834, he did not build the first industrially practical evaporator until 1845. Originally designed for concentrating sugar in sugar cane juice, it has since become widely used in all industrial applications where large volumes of water must be evaporated, such as salt production and water desalination.
Multiple effect evaporation commonly uses sensible heat in the condensate to preheat liquor to be flashed. In practice the design liquid flow paths can be somewhat complicated in order to extract the most recoverable heat and to obtain the highest evaporation rates from the equipment.
Multiple-effect evaporation plants in sugar beet factories have up to eight effects. Six effect evaporators are common in the recovery of black liquor in the kraft process for making wood pulp.
This document discusses ice cream freezers and their functions. It describes the factors that influence freezing time and the different types of freezers, including batch and continuous freezers. Batch freezers freeze ice cream in batches using a cylindrical drum with an inner cooling jacket. Continuous freezers continuously pump and freeze the ice cream mix using systems like disk type, Vogt jet, or creamey package freezers to freeze and aeriate the mix. The document provides details on the construction, working principles, and types of both batch and continuous ice cream freezers.
Mass and energy balances must be completed for each piece of equipment before detailed design can begin. A mass balance is done for each unit shown on the process flowsheet, while an energy balance is done over groups of units where energy is transferred between process fluids. Even at the design stage, some flowrates and temperatures may only be estimates. The mass and energy balances will need updating after detailed design is complete. Calculations are included as an appendix and provide details like mass flowrates, compositions, temperatures, pressures, and enthalpy contents of all streams.
The document discusses different types of moisture measurement and their applications. There are several common methods for measuring moisture content, including drying methods like thermogravimetric analysis and oven drying, the Karl Fischer titration method, dielectric and infrared absorption techniques, and neutron analysis. Each method has advantages and limitations depending on the material and desired accuracy. Understanding moisture content is important for many industries as it can impact material properties and quality control.
This document provides information on the design of freezers and cold storages. It discusses the three main methods of freezing food: air blast, contact/plate, and immersion/spray. It describes the design and types of air blast, plate, liquid nitrogen, carbon dioxide, and immersion freezers. It also covers the classification, construction, insulating materials, types of loads, and vapor barriers used for cold storages. The document is an educational text providing technical details on freezer and cold storage design.
Advance in mass transfer in food applicationDayanand Raj
This document discusses advances in mass transfer processes for food applications. It begins by defining mass transfer and providing examples such as evaporation, absorption, and distillation. The fundamentals of mass transfer are then explained, noting that concentration gradients provide the driving force for mass to move between phases. Several key mass transfer operations for separating mixtures are described in detail, including distillation, gas absorption, dehumidification, liquid extraction, leaching, and drying. A variety of industrial and food processing applications that employ these operations are also outlined.
This document provides information on different types of heat exchangers:
- Multiple pass heat exchangers allow fluids to pass each other more than once using U-bend tubes or shell-side baffles, improving heat transfer.
- Plate heat exchangers use corrugated metal plates separated by gaskets to transfer heat between fluids in alternating channels. They are compact and efficient.
- Scraped surface heat exchangers have an internal rotating cylinder fitted with blades that continuously scrape the heating surface, used for viscous fluids.
- Double pipe heat exchangers consist of two concentric pipes for countercurrent flow, used in boilers, coolers, condensers and evaporators.
RETORT PROCESSING BY Dr.P.RAJKUMAR-HOD (F&PE)kurinchisiva
The document discusses retort packaging and processing. It defines retort as a closed chamber that can withstand high temperatures and pressures used for sterilization. It describes the various types of retorts including batch, continuous, steam, water spray, and agitating retorts. It also discusses retort pouches, their construction and materials, products packaged in pouches, and the advantages of retort packaging over other methods.
Membrane separation process and its applications in food processingPriya darshini
This document summarizes key concepts in membrane separation processes used in food engineering applications. It defines membrane separation as selectively separating materials through a semi-permeable barrier based on molecule size and properties. It then discusses membrane transport mechanisms and important membrane properties like permeability and retention. Finally, it provides examples of membrane processes and materials commonly used in food industries like dairy, fruit juice, sugar, and brewing.
Freezing helps to Inhibit the growth of microorganisms hence help in preservation of foods. So, freezing is a very easy and effective method for the preservation of fruits and vegetables and to retain them for longer duration.
This document discusses key aspects in designing food processing plants, including plant layout and feasibility studies. It covers:
1) Distinct design considerations for food industries due to seasonal raw materials, stringent hygiene, and social cost-benefit analysis.
2) Components of a feasibility study including market potential, technical requirements, and financial projections.
3) Key factors in plant layout including flow patterns, equipment arrangement to minimize costs, and secondary considerations like climate and waste disposal.
Freezing curve, freezing system & freezing timeMuneeb Vml
The document discusses freezing as an operation to preserve food by lowering its temperature below the freezing point. It describes the freezing process and freezing curve, including nucleation, crystal growth, and how solute concentration changes. It discusses factors that influence freezing time like thermal conductivity and size/shape of food pieces. Methods to calculate freezing time are presented, including Planck's equation and Pham's method. Different freezing systems are outlined like air blast freezers, plate freezers, and fluidized bed freezers.
Freezing is a key step in ice cream production that incorporates air into the mix to give it a light, creamy texture. There are two main types of freezers - batch and continuous. Batch freezers freeze individual batches while continuous freezers continuously feed and freeze the mix. Both utilize a freezing cylinder and dasher to freeze and incorporate air into the mix, though continuous freezers operate under pressure. Proper freezing results in small ice crystals that give ice cream a smooth body and texture.
The document discusses plate heat exchangers. It describes how plate heat exchangers use metal plates to transfer heat between two fluids flowing in alternating passages. They are classified as plate and frame, brazed, or welded depending on how the plates are joined. Benefits include compact size and high efficiency. Limitations include limited operating pressures and temperatures as well as susceptibility to fouling. In conclusion, plate heat exchangers offer advantages over shell and tube exchangers and their performance can be further enhanced through design.
The document discusses the design of a rotary dryer, noting that the best design uses pilot plant test data, full-scale operating data from similar dryers if available, and available design equations. There are many variables to consider such as the solid throughput, inlet and exit moisture contents of the solid, critical and equilibrium moisture contents, and the temperature and humidity of the drying gas. The document provides an example case study where the solid has only unbound moisture and in one stage reaches the wet bulb temperature of the gas.
Dehydration is a method of food preservation that involves removing water from foods through the application of heat. This reduction in water content inhibits microbial growth and enzyme activity, extending the shelf life of foods. However, dehydration also causes deterioration in food quality attributes like texture, flavor, and nutrition. Various factors influence the dehydration process, and different equipment like cabinet dryers, tunnel dryers, and spray dryers are used depending on the type of food being dried.
There are two main methods of freezing food commercially - fast freezing at temperatures below -25°C which forms small ice crystals, and slow freezing above -24°C which forms larger crystals that can damage the food. Common freezing techniques include air blast, fluidized bed, plate or belt, immersion, and cryogenic freezing using liquid nitrogen or carbon dioxide. The freezing method chosen depends on factors like the food quality desired, type and shape of the food, package used, required flexibility, and costs. Equations can be used to estimate freezing times based on properties of the food and freezing conditions.
The document discusses the process of freeze concentration. Freeze concentration involves freezing a liquid food which causes ice crystals to form and separate out pure water, leaving a more concentrated liquid product. It can concentrate fruit juices, coffee, tea, beer and wine while better preserving quality and nutrients compared to other concentration methods. Key steps involve nucleation and growth of ice crystals followed by separation of the crystals from the concentrated liquid.
This document defines mechanical separation and describes the key processes involved. Mechanical separation uses machines to separate mixtures based on differences in density or size/shape. There are four main types of mechanical separation: sedimentation, centrifugal separation, filtration, and sieving. Sedimentation involves settling solids to the bottom of a liquid. Centrifugal separation uses centrifugal force to separate mixtures based on density differences. Filtration passes a solid-liquid mixture through a porous medium to separate insoluble solids. Sieving involves mechanically shaking a sample to separate particles by size as they pass through mesh screens. Mechanical separation is used extensively in food processing due to its ability to efficiently separate materials in a timely manner.
The document discusses unit operations in food process engineering. It describes the objectives as studying principles and laws governing physical, chemical, or biochemical process stages and related equipment. It classifies unit operations into physical, chemical, and biochemical stages involving operations like grinding, sieving, filtration, and fermentation. It also discusses mass transfer, heat transfer, and simultaneous mass-heat transfer unit operations. The document then focuses on heat exchangers, describing types like plate, tubular, and shell-and-tube heat exchangers. It discusses parameters for heat exchanger design like overall heat transfer coefficient, log mean temperature difference, and fouling factor.
Ultra High Temperature Processing of Food ProductsSourabh Bhartia
The document discusses ultra high temperature (UHT) processing of food products. UHT processing involves heating food to 135°C for 2-5 seconds to kill microorganisms and spores. This allows for longer shelf life without refrigeration. There are two main methods - direct heating which applies steam directly to the food, and indirect heating which uses a partition between the food and steam. Indirect heating includes plate heat exchangers, tubular heat exchangers, and scraped surface heat exchangers. UHT processing offers benefits like longer shelf life and packaging flexibility but requires complex sterile processing equipment.
Frying is a cooking method that uses hot oil to alter the eating quality and extend the shelf life of foods. There are different types of frying including deep fat frying, where the food is completely submerged in hot oil, and shallow frying, where only a thin layer of oil is used. Frying involves the application of heat to the food which causes water to evaporate and a crust to form. The temperature and time of frying affects properties like color, flavor, and oil content of the fried food. Frying can increase fat and calorie content but also enhances texture and preserves foods for longer shelf life. New methods like air frying use convection to crisp foods with less oil absorption than deep f
This document discusses mass balances (also called material balances) and energy balances. It explains that mass balances play a bigger role in this course, as many calculations are based on material balances. The concept of a material balance is that what comes in must come out. A general mass balance equation and procedure for solving material balance problems is provided. Additionally, the document outlines energy balances and notes they can be more complex than mass balances since energy exists in many forms.
EVAPORATION AND CONCENTRATION OF FOOD.pptxUnnimayaK4
Evaporation is commonly used to remove water from dilute foods to produce concentrated liquid products. It involves boiling the food to evaporate water. This increases microbiological stability and reduces costs of transportation and storage. Various methods are used including open kettle, thin film evaporation, and vacuum evaporation. Multiple effect evaporators connect several evaporators together to improve efficiency by using vapor from one effect to heat the next. Factors like heat transfer rate and viscosity influence the evaporation process. Common applications are producing concentrated juices, coffee extracts, evaporated milk, and reducing volumes of foods prior to further processing.
A psychrometric chart graphically represents psychrometric processes of air. It can be used to plot multiple data points representing air conditions at a time and identify the comfort zone where occupants are satisfied. The chart contains lines for dry bulb temperature, wet bulb temperature, and relative humidity. A psychrometric chart can evaluate systems like air heating, cooling towers, evaporative condensers, and evaporative cooling and analyze energy usage in dryers.
The process of freeze drying with greater emphasis on the uses in the fisheries food processing sector. The presentation shows the process involved and the different steps involved and the effect of the process on the food material.
The document discusses evaporation as a process to remove water from dilute liquids to produce concentrated liquids. It describes how an evaporator uses a heat exchanger and vacuum chamber to boil liquids at low temperatures, minimizing heat damage. Various types of evaporators are covered, including single-effect, multiple-effect, batch, natural circulation, rising film, falling film, and forced circulation evaporators. Key factors that affect evaporation rates like heat transfer, boiling point, pressure, and changes to products are also summarized.
1. A process model was developed to determine the net energy ratio (NER) for regular and steam-pretreated biomass pellet production. NER is the ratio of net energy output to total non-renewable energy input.
2. The model analyzed scenarios with different steam pretreatment temperatures and levels. The base case NER was 1.29 for steam-pretreated pellets and 5.0 for regular pellets.
3. Steam pretreatment at 200°C with 50% of feedstock undergoing pretreatment yielded the optimum NER. Drying and steam units require the most energy.
Methods to minimise energy use in food processingMdShakibulIslam7
The food and drink industry is a major user of energy in a large number of diverse applications, which include the provision of steam or hot water, drying, other separation processes such as evaporation and distillation, refrigeration, and baking. Although energy costs have increased considerably in the last few years and other energy-related factors such as emissions are becoming increasing costly to remedy, in many cases the energy consumed is not effectively used which has a considerable impact on the competitiveness of individual processing plants and the economic wellbeing of the whole food and drink sector. The effect of increasing the efficiency of energy use is to reduce operating costs, lower production costs, increase productivity, conserve limited energy resources, and reduce emissions, most especially in the case of greenhouse gases such as CO2
RETORT PROCESSING BY Dr.P.RAJKUMAR-HOD (F&PE)kurinchisiva
The document discusses retort packaging and processing. It defines retort as a closed chamber that can withstand high temperatures and pressures used for sterilization. It describes the various types of retorts including batch, continuous, steam, water spray, and agitating retorts. It also discusses retort pouches, their construction and materials, products packaged in pouches, and the advantages of retort packaging over other methods.
Membrane separation process and its applications in food processingPriya darshini
This document summarizes key concepts in membrane separation processes used in food engineering applications. It defines membrane separation as selectively separating materials through a semi-permeable barrier based on molecule size and properties. It then discusses membrane transport mechanisms and important membrane properties like permeability and retention. Finally, it provides examples of membrane processes and materials commonly used in food industries like dairy, fruit juice, sugar, and brewing.
Freezing helps to Inhibit the growth of microorganisms hence help in preservation of foods. So, freezing is a very easy and effective method for the preservation of fruits and vegetables and to retain them for longer duration.
This document discusses key aspects in designing food processing plants, including plant layout and feasibility studies. It covers:
1) Distinct design considerations for food industries due to seasonal raw materials, stringent hygiene, and social cost-benefit analysis.
2) Components of a feasibility study including market potential, technical requirements, and financial projections.
3) Key factors in plant layout including flow patterns, equipment arrangement to minimize costs, and secondary considerations like climate and waste disposal.
Freezing curve, freezing system & freezing timeMuneeb Vml
The document discusses freezing as an operation to preserve food by lowering its temperature below the freezing point. It describes the freezing process and freezing curve, including nucleation, crystal growth, and how solute concentration changes. It discusses factors that influence freezing time like thermal conductivity and size/shape of food pieces. Methods to calculate freezing time are presented, including Planck's equation and Pham's method. Different freezing systems are outlined like air blast freezers, plate freezers, and fluidized bed freezers.
Freezing is a key step in ice cream production that incorporates air into the mix to give it a light, creamy texture. There are two main types of freezers - batch and continuous. Batch freezers freeze individual batches while continuous freezers continuously feed and freeze the mix. Both utilize a freezing cylinder and dasher to freeze and incorporate air into the mix, though continuous freezers operate under pressure. Proper freezing results in small ice crystals that give ice cream a smooth body and texture.
The document discusses plate heat exchangers. It describes how plate heat exchangers use metal plates to transfer heat between two fluids flowing in alternating passages. They are classified as plate and frame, brazed, or welded depending on how the plates are joined. Benefits include compact size and high efficiency. Limitations include limited operating pressures and temperatures as well as susceptibility to fouling. In conclusion, plate heat exchangers offer advantages over shell and tube exchangers and their performance can be further enhanced through design.
The document discusses the design of a rotary dryer, noting that the best design uses pilot plant test data, full-scale operating data from similar dryers if available, and available design equations. There are many variables to consider such as the solid throughput, inlet and exit moisture contents of the solid, critical and equilibrium moisture contents, and the temperature and humidity of the drying gas. The document provides an example case study where the solid has only unbound moisture and in one stage reaches the wet bulb temperature of the gas.
Dehydration is a method of food preservation that involves removing water from foods through the application of heat. This reduction in water content inhibits microbial growth and enzyme activity, extending the shelf life of foods. However, dehydration also causes deterioration in food quality attributes like texture, flavor, and nutrition. Various factors influence the dehydration process, and different equipment like cabinet dryers, tunnel dryers, and spray dryers are used depending on the type of food being dried.
There are two main methods of freezing food commercially - fast freezing at temperatures below -25°C which forms small ice crystals, and slow freezing above -24°C which forms larger crystals that can damage the food. Common freezing techniques include air blast, fluidized bed, plate or belt, immersion, and cryogenic freezing using liquid nitrogen or carbon dioxide. The freezing method chosen depends on factors like the food quality desired, type and shape of the food, package used, required flexibility, and costs. Equations can be used to estimate freezing times based on properties of the food and freezing conditions.
The document discusses the process of freeze concentration. Freeze concentration involves freezing a liquid food which causes ice crystals to form and separate out pure water, leaving a more concentrated liquid product. It can concentrate fruit juices, coffee, tea, beer and wine while better preserving quality and nutrients compared to other concentration methods. Key steps involve nucleation and growth of ice crystals followed by separation of the crystals from the concentrated liquid.
This document defines mechanical separation and describes the key processes involved. Mechanical separation uses machines to separate mixtures based on differences in density or size/shape. There are four main types of mechanical separation: sedimentation, centrifugal separation, filtration, and sieving. Sedimentation involves settling solids to the bottom of a liquid. Centrifugal separation uses centrifugal force to separate mixtures based on density differences. Filtration passes a solid-liquid mixture through a porous medium to separate insoluble solids. Sieving involves mechanically shaking a sample to separate particles by size as they pass through mesh screens. Mechanical separation is used extensively in food processing due to its ability to efficiently separate materials in a timely manner.
The document discusses unit operations in food process engineering. It describes the objectives as studying principles and laws governing physical, chemical, or biochemical process stages and related equipment. It classifies unit operations into physical, chemical, and biochemical stages involving operations like grinding, sieving, filtration, and fermentation. It also discusses mass transfer, heat transfer, and simultaneous mass-heat transfer unit operations. The document then focuses on heat exchangers, describing types like plate, tubular, and shell-and-tube heat exchangers. It discusses parameters for heat exchanger design like overall heat transfer coefficient, log mean temperature difference, and fouling factor.
Ultra High Temperature Processing of Food ProductsSourabh Bhartia
The document discusses ultra high temperature (UHT) processing of food products. UHT processing involves heating food to 135°C for 2-5 seconds to kill microorganisms and spores. This allows for longer shelf life without refrigeration. There are two main methods - direct heating which applies steam directly to the food, and indirect heating which uses a partition between the food and steam. Indirect heating includes plate heat exchangers, tubular heat exchangers, and scraped surface heat exchangers. UHT processing offers benefits like longer shelf life and packaging flexibility but requires complex sterile processing equipment.
Frying is a cooking method that uses hot oil to alter the eating quality and extend the shelf life of foods. There are different types of frying including deep fat frying, where the food is completely submerged in hot oil, and shallow frying, where only a thin layer of oil is used. Frying involves the application of heat to the food which causes water to evaporate and a crust to form. The temperature and time of frying affects properties like color, flavor, and oil content of the fried food. Frying can increase fat and calorie content but also enhances texture and preserves foods for longer shelf life. New methods like air frying use convection to crisp foods with less oil absorption than deep f
This document discusses mass balances (also called material balances) and energy balances. It explains that mass balances play a bigger role in this course, as many calculations are based on material balances. The concept of a material balance is that what comes in must come out. A general mass balance equation and procedure for solving material balance problems is provided. Additionally, the document outlines energy balances and notes they can be more complex than mass balances since energy exists in many forms.
EVAPORATION AND CONCENTRATION OF FOOD.pptxUnnimayaK4
Evaporation is commonly used to remove water from dilute foods to produce concentrated liquid products. It involves boiling the food to evaporate water. This increases microbiological stability and reduces costs of transportation and storage. Various methods are used including open kettle, thin film evaporation, and vacuum evaporation. Multiple effect evaporators connect several evaporators together to improve efficiency by using vapor from one effect to heat the next. Factors like heat transfer rate and viscosity influence the evaporation process. Common applications are producing concentrated juices, coffee extracts, evaporated milk, and reducing volumes of foods prior to further processing.
A psychrometric chart graphically represents psychrometric processes of air. It can be used to plot multiple data points representing air conditions at a time and identify the comfort zone where occupants are satisfied. The chart contains lines for dry bulb temperature, wet bulb temperature, and relative humidity. A psychrometric chart can evaluate systems like air heating, cooling towers, evaporative condensers, and evaporative cooling and analyze energy usage in dryers.
The process of freeze drying with greater emphasis on the uses in the fisheries food processing sector. The presentation shows the process involved and the different steps involved and the effect of the process on the food material.
The document discusses evaporation as a process to remove water from dilute liquids to produce concentrated liquids. It describes how an evaporator uses a heat exchanger and vacuum chamber to boil liquids at low temperatures, minimizing heat damage. Various types of evaporators are covered, including single-effect, multiple-effect, batch, natural circulation, rising film, falling film, and forced circulation evaporators. Key factors that affect evaporation rates like heat transfer, boiling point, pressure, and changes to products are also summarized.
1. A process model was developed to determine the net energy ratio (NER) for regular and steam-pretreated biomass pellet production. NER is the ratio of net energy output to total non-renewable energy input.
2. The model analyzed scenarios with different steam pretreatment temperatures and levels. The base case NER was 1.29 for steam-pretreated pellets and 5.0 for regular pellets.
3. Steam pretreatment at 200°C with 50% of feedstock undergoing pretreatment yielded the optimum NER. Drying and steam units require the most energy.
Methods to minimise energy use in food processingMdShakibulIslam7
The food and drink industry is a major user of energy in a large number of diverse applications, which include the provision of steam or hot water, drying, other separation processes such as evaporation and distillation, refrigeration, and baking. Although energy costs have increased considerably in the last few years and other energy-related factors such as emissions are becoming increasing costly to remedy, in many cases the energy consumed is not effectively used which has a considerable impact on the competitiveness of individual processing plants and the economic wellbeing of the whole food and drink sector. The effect of increasing the efficiency of energy use is to reduce operating costs, lower production costs, increase productivity, conserve limited energy resources, and reduce emissions, most especially in the case of greenhouse gases such as CO2
WASTE HEAT RECOVERY IN DOMESTIC REFRIGERATION SYSTEM IN THE APPLICATION OF WA...Journal For Research
Heat is the energy, so energy saving is one of the key matters for the protection of global environment. Heat also radiated from our domestic refrigerator. This waste heat from refrigerator will affect the environmental because as heat in the environment will increases it will cause global warming. So it is necessary that a significant effort should be made for conserving energy through waste heat recovery too. So An attempt has been made to utilize waste heat from condenser of refrigerator. This heat can be used for various of domestic and industrial purposes. In minimum constructional, maintenance and running cost, this system is very useful for domestic purpose. It is valuable alternative approach to increase overall efficiency and reuse the waste heat. The study has shown that such a system is technically feasible and economical. This system is a cabin that we are going to install over the head of the simple refrigerator, this cabin will be an arrangement of coils that will work as a heat exchanger for reuse of waste heat. These coils are hot coils of condenser of the refrigerator that will be modified and will put in the cabin. It can serve the purpose of cooking, geysers etc. Besides, the refrigerator may be used as conventional refrigerator. Further COP will also increase. Heat rejection may occur directly to the air in the case of a conventional household domestic refrigerator having air-cooled condenser. This system rejected less heat to the environment so it is safer in environmental aspects also.
Energy Audit in the Dairy Industry - Sitaram Gokul Dairy Nepaleecfncci
This document summarizes an energy audit conducted at Sita Ram Gokul Milk in Kathmandu, Nepal. The audit identified opportunities to reduce waste and improve energy efficiency in areas like waste water management, energy usage, insulation, and equipment upgrades. Recommendations included installing trigger nozzles, timers, high pressure cleaners, and modifying CIP facilities to reduce water waste. Upgrades to boilers, installing variable frequency drives, and recovering heat and condensate from processes were also recommended. The company has implemented some recommendations and is working to complete other proposed upgrades.
The contract Research and Development (R&D) team of Guires Food Research Lab (FRL) has vast experience designing and developing new food products tailored to the client’s goals.
More Info >> https://www.foodresearchlab.com/what-we-do/new-product-development-service/new-food-product-development/
The document presents a project on producing pyrolysis oil from mahogany wood. It discusses (1) designing and constructing a batch type pyrolysis reactor to produce the oil, (2) carrying out experiments at different temperatures and recording yields, and (3) analyzing the pyrolysis oil to determine its combustible hydrocarbons, calorific values, flashpoint, and pour point. The results found the oil to be an alternative fuel source. It was thus concluded that pyrolyzing biomass can contribute to a country's economy, renewable energy needs, and a cleaner environment by converting waste wood to pyrolysis oil.
Design &Analysis of Waste Heat Recovery System for Domestic RefrigeratorIJMER
Heat is energy, so energy saving is one of the key matters from view point of fuel consumption
and for the protection of global environment. So it is necessary that a significant and concrete effort should
be made for conserving energy through waste heat recovery too. The main objective of this paper is to study
“Waste Heat recovery system for domestic refrigerator”. An attempt has been made to utilize waste heat
from condenser of refrigerator. This heat can be used for number of domestic and industrial purposes. In
minimum constructional, maintenance and running cost, this system is much useful for domestic purpose. It
is valuable alternative approach to improve overall efficiency and reuse the waste heat. The study has
shown that such a system is technically feasible and economically viable.
It's a initial report on a hybrid solar dryer used in traditional drying applications. Here Dryer is automated using electronic & semiconductor applications(Arduino UNO, relay switching module, humidity sensor, digital thermometer etc.). It will be an efficient report for those who will start their work on solar dryer used in drying various seasonal crops.
This document provides an overview of energy from waste (EfW) technologies for decision-makers. It describes the different EfW technologies including combustion, gasification, pyrolysis, anaerobic digestion, and landfill gas capture. It explains that EfW can help reduce the UK's dependency on energy imports, reduce carbon emissions, and contribute to renewable energy targets. However, barriers to the uptake of EfW include difficulties obtaining planning permission for large EfW plants and inconsistencies in financial incentives like the Renewable Heat Incentive that need to be addressed.
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(1) Vegetable waste generated from processing operations in India presents waste management challenges due to the large volumes generated and lack of infrastructure.
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2. ▪ The food processing industry sector is large, growing, and competitive contributing millions to
nation’s economy.
▪ The products manufactured in these industries includes meat products, dairy products, preserved
fruits and vegetables, grain mill products, bakery products, sugar and confectionery products, fats
and oils, beverages, and other miscellaneous food products.
▪ Energy use in the food industry is examined by cost of fuels and electricity.
3. ▪ Heating and cooling process was the most energy consuming
process in the food industry taking up 44.6% of the total
energy inputs.
▪ Boiler losses accounted for an average of about 22% of energy
inputs.
▪ Wet corn milling is the most energy intensive industry in food
processing sector with a 15% share of the total energy used.
▪ The beet sugar industry is second in energy use with 7%
weightage.
▪ Soy-bean oil mills, malt beverage, and meat packing plants
take about 5% each of the total energy use in this sector.
Image Source: Energy Conservation
http://www.sustainablefoodservice.com
4. Typical mass and energy flows in a food processing facility.(Reprinted
from Muller,D.C.A., Marechal,F.M.A.,Wolewinski,T., and Roux, P.J.,Appl.
Thermal Eng.,
• Horizontal flows represent
the transformation of raw
materials into food products
and by-products.
• Vertical flows represent
energy and water.
• Maximizing the horizontal
flows and minimizing the
vertical flows will minimize
the production costs and
environmental impact.
5. ▪ High-grade or high-quality energy sources
provide more organized forms of energy
than low-grade sources.
▪ The energy sources that have a high grade
include kinetic energy of moving matter,
gravitational potential energy, and electrical
energy, which can be converted into
another energy form with small energy
losses.
▪ Chemical energy has an intermediate grade,
followed by high-temperature heat and low-
temperature heat. Image source: Energy management and efficiency for Food
Processing Industries Alan P Rossiter, Beth P Jones 2015 by the
American Institute of Chemical Engineers, WILEY
6. ▪Increase in energy efficiency is accomplished mainly
by the integration of complex heat flows within
processing facilities.
▪This can be achieved by making a wise choice of
production routes, raw materials, and energy carriers
is required to significantly improve energy efficiency
and process economics simultaneously.
7. ▪According to the first law of thermodynamics, the sum of
anergy (lost energy) and exergy (available energy) is
constant.
▪Exergy eventually ends up in the desired products.
▪Also, exergy can always be converted into anergy while
anergy can never be converted into exergy.
▪Therefore, it is important to delay the degradation of
exergy as long as possible in a processing facility.
8. ▪ In thermodynamics, the exergy of a system is the
maximum useful work possible during a process that
brings the system into equilibrium with a heat
reservoir, reaching maximum entropy.
▪ Can be lost in two ways:
✓Internal energy losses due to the irreversibility of
the process itself.
✓External energy losses in the waste streams that do
not reach equilibrium with the environment. Energy and Exergy:A Comparative difference
9. ▪ The exergy destruction due to irreversibility is
Exdestruction = Exin − Exout = T0ΔS
Where,
T0 is the environmental temperature in Kelvin
ΔS is the generated entropy during conversion
▪ The exergy stored in the waste steams is determined
by
Exwaste = Exout − Exproduct
10. Process Energy Efficiency Exergy Efficiency
Source: Adapted from Dincer, I., Hussain, M.M., and Al-Zaharnah, I., Energy Policy, 33, 1461, 2005.
11. Process Energy Efficiency Exergy Efficiency
Source: Adapted from Dincer, I., Hussain, M.M., and Al-Zaharnah, I., Energy Policy, 33, 1461, 2005.
12. ▪ Thermal processes such as pasteurization and
sterilization, chilling and freezing, and evaporation and
drying are energy-intensive unit operations used in the
food industry for food preservation and safety.
▪ The energy saving opportunities for each unit operations
include three aspects:
1. Improvement of energy efficiency in existing units
2. Replacement of energy-intensive units with novel
units
3. Use of renewable energy sources, particularly food
processing wastes
Image Source: Unit Operations in Food Processing,
R L Earle
13. ▪ According to the results from Simpson et al. (2006), retort insulation can
reduce 15%–25% of current energy consumption depending on selected
conditions.
▪ An increase in the initial temperature of food products can reduce the peak
energy demand in the order of 25%–35%.
▪ Thus, operating practice can also reduce the peak energy demand during
retorting.
14. ▪ Ozyurt et al. (2004) designed a liquid-to-liquid heat pump for
pasteurization.
▪ Hot pasteurized milk is cooled by the evaporator of the heat pump while
the cold raw milk is heated by the condenser of the heat pump.
▪ For the pasteurization temperature at 72°C and coagulation
temperature at 32°C, the measured COP of the heat pump ranged from
2.3 to 3.1.
▪ In this way, The heat pump system can save 66% of the primary energy
compared to traditional plate and double jacket milk pasteurization
systems.
15. ▪ Heat pumps have been used to increase the drying efficiency of
convectional air dryers (Perera and Rahman, 1997).
▪ A heat pump can also be used to extract heat from a low-temperature
energy source such as geothermal energy through its evaporator and
upgrade the extracted heat to a high-temperature heat source at its
condenser for drying (Kuzgunkaya and Hepbasli, 2007).
▪ Supercritical fluids such as supercritical carbon dioxide can be used to
remove moisture from foods (Brown et al., 2007).
▪ Supercritical CO2 drying has been found to generate more favorable re-
hydrated textural properties than the air-dried equivalents.
16. ▪Food processing facilities make heavy use of refrigeration. It is
estimated that the refrigeration systems use as much as 15% of the
total energy consumed worldwide.
▪Generally, energy conservation for refrigeration unit operations
can be achieved by:
✓ Improved insulation
✓ Best practice
✓ Use of novel refrigeration cycles powered by waste heat
17. ▪ Biot number is the ratio of the internal resistance to the external resistance,
which is expressed as (Singh and Heldman, 2001)
Bio=
hl
𝑘
where
l is a characteristic dimension of the food body
m is the radius of a round shaped body and half of the thickness of a fl at shaped body
h is the surface convective heat transfer coeffi cient (W/m2 °C)
k is the thermal conductivity of foods (W/m°C)
▪ For higher efficiency in cooling and freezing, the Bio value should not exceed 5
(Mattarolo, 1976)
18. ▪ The increasing energy prices and efforts for the reduction of CO2 emission,
improving the energy efficiency had become an important consideration in
sustainable establishment of food processing plants.
▪ For this reason, Energy efficiency improvement and waste-heat recovery in
the food industry have been a focus in the current scenarios.
▪ This can be achieved by replacement of conventional energy with novel
technologies as well as techniques to replace traditional energy-intensive unit
operations for pasteurization and sterilization, evaporation and dehydration,
and chilling and freezing in the food industry.