This document proposes a novel latent heat storage system for solar space heating and cooling systems using refrigerant storage. The system utilizes an absorption refrigeration cycle using a heat source such as solar energy to generate refrigerant gas. The refrigerant is condensed and stored for later use, providing improved energy storage capacity over sensible heat storage methods. When heating or cooling is needed, the stored refrigerant is evaporated to power the cycle. For heating, the absorber heat is used to heat buildings. The refrigerant storage concept provides high energy density, near-ambient storage temperatures, and low storage pressures. This system could improve the viability of solar heating and cooling if extended for combined year-round operation.
A B S T R A C T
In the present paper, an experimental analysis of a solar water heating collector with an integrated latent heat storage unit is presented. With the purpose to determine the performance of a device on a lab scale, but with commercial features, a flat plate solar collector with phase change material (PCM) containers under the absorber plate was constructed and tested. PCM used was a commercial semi-refined light paraffin with a melting point of 60°C. Tests were carried out in outdoor conditions from October 2016 to March 2017 starting at 7:00 AM until the collector does not transfer heat to the water after sunset. Performance variables as water inlet temperature, outlet temperature, mass flow and solar radiation were measured in order to determine a useful heat and the collector efficiency. Furthermore, operating temperatures of the glass cover, air gap, absorber plate, and PCM containers are presented. Other external variables as ambient temperature, humidity and wind speed were measured with a weather station located next to the collector. The developed prototype reached an average thermal efficiency of 24.11% and a maximum outlet temperature of 50°C. Results indicate that the absorber plate reached the PCM melting point in few cases, this suggests that the use of a PCM with a lower melting point could be a potential strategy to increase thermal storage. A thermal analysis and conclusions of the device performance are discussed.
CONTEMPORARY URBAN AFFAIRS (2017) 1(3), 7-12. Doi: 10.25034/ijcua.2018.3672
www.ijcua.com
With the introduction of the government’s Renewable Heat Incentive (RHI), there is an increasing interest in all the technologies associated with the scheme. This CPD gives an overview of a range of policy initiatives in Renewable Heat, an introduction to the different technologies and looks at some of the benefits and issues you need to consider when using renewable heat.
This CPD seminar covers the following topics: Introduction to REHAU, DECC Heat Strategy & Renewable Heat Incentive (RHI), Ground Source Heat Pumps, Biomass Boilers (incl. district heating), Biogas/Anaerobic Digestion, Solar Thermal & Underground Thermal Energy Storage.
Thermal energy storage materials and systems for solar energy applicationsSivanjaneya Reddy
How to enhance thermal conductivity for phase change materials and selection of phase change material and about systems for solar energy application has been presented
Review on latent heat storage and problems associated with phase change mater...eSAT Journals
Abstract Energy storage devices have important role in the energy system as they minimize the mismatch between the supply and demand. This leads to improvement of the performance and the reliability of the systems. In thermal energy storage systems the Latent heat type thermal energy storages (LHTES) are attractive since they have high energy storage density and nearly isothermal operation at the phase transition temperature of the material usedthat is commonly known as phase change material (PCM). In this paper PCMs with solid-solid and solid-liquid phase transition are discussed. Though PCMs with solid-solid phase transition seem attractive due to their less stringent containment requirements but they are not widely used because of their low latent heat. PCMs with solid-liquid phase transition are the most studied and used latent heat storage materials. Those are discussed in details with their selection criterion, classification and applications. The steps involved in development of the energy storage systems and problems associated with PCMs are discussed in the next part of the paper. This will give better understanding of the latent heat storage systems to the reader. KeyWords: Latent heat storage (LHS), Phase change materials (PCM), Thermal conductivity, Thermal cycling.
Experimental analysis of a flat plate solar collector with integrated latent heat thermal storage
*Mauricio, Carmona1, Mario Palacio2, ArnoldMartínez3
1 Mechanical Engineering Department, Universidad del Norte, Colombia
2 Faculty of Mechanical and Industrial Engineering, Universidad PontificiaBolivariana, Colombia
3 Mechanical Engineering Department, Universidad de Córdoba, Colombia
1E mail: mycarmona@uninorte.edu.co,2E mail: mario.palaciov@upb.edu.co
A B S T R A C T
In the present paper, an experimental analysis of a solar water heating collector with an integrated latent heat storage unit is presented. With the purpose to determine the performance of a device on a lab scale, but with commercial features, a flat plate solar collector with phase change material (PCM) containers under the absorber plate was constructed and tested. PCM used was a commercial semi-refined light paraffin with a melting point of 60°C. Tests were carried out in outdoor conditions from October 2016 to March 2017 starting at 7:00 AM until the collector does not transfer heat to the water after sunset. Performance variables as water inlet temperature, outlet temperature, mass flow and solar radiation were measured in order to determine a useful heat and the collector efficiency. Furthermore, operating temperatures of the glass cover, air gap, absorber plate, and PCM containers are presented. Other external variables as ambient temperature, humidity and wind speed were measured with a weather station located next to the collector. The developed prototype reached an average thermal efficiency of 24.11% and a maximum outlet temperature of 50°C. Results indicate that the absorber plate reached the PCM melting point in few cases, this suggests that the use of a PCM with a lower melting point could be a potential strategy to increase thermal storage. A thermal analysis and conclusions of the device performance are discussed.
A B S T R A C T
In the present paper, an experimental analysis of a solar water heating collector with an integrated latent heat storage unit is presented. With the purpose to determine the performance of a device on a lab scale, but with commercial features, a flat plate solar collector with phase change material (PCM) containers under the absorber plate was constructed and tested. PCM used was a commercial semi-refined light paraffin with a melting point of 60°C. Tests were carried out in outdoor conditions from October 2016 to March 2017 starting at 7:00 AM until the collector does not transfer heat to the water after sunset. Performance variables as water inlet temperature, outlet temperature, mass flow and solar radiation were measured in order to determine a useful heat and the collector efficiency. Furthermore, operating temperatures of the glass cover, air gap, absorber plate, and PCM containers are presented. Other external variables as ambient temperature, humidity and wind speed were measured with a weather station located next to the collector. The developed prototype reached an average thermal efficiency of 24.11% and a maximum outlet temperature of 50°C. Results indicate that the absorber plate reached the PCM melting point in few cases, this suggests that the use of a PCM with a lower melting point could be a potential strategy to increase thermal storage. A thermal analysis and conclusions of the device performance are discussed.
CONTEMPORARY URBAN AFFAIRS (2017) 1(3), 7-12. Doi: 10.25034/ijcua.2018.3672
www.ijcua.com
With the introduction of the government’s Renewable Heat Incentive (RHI), there is an increasing interest in all the technologies associated with the scheme. This CPD gives an overview of a range of policy initiatives in Renewable Heat, an introduction to the different technologies and looks at some of the benefits and issues you need to consider when using renewable heat.
This CPD seminar covers the following topics: Introduction to REHAU, DECC Heat Strategy & Renewable Heat Incentive (RHI), Ground Source Heat Pumps, Biomass Boilers (incl. district heating), Biogas/Anaerobic Digestion, Solar Thermal & Underground Thermal Energy Storage.
Thermal energy storage materials and systems for solar energy applicationsSivanjaneya Reddy
How to enhance thermal conductivity for phase change materials and selection of phase change material and about systems for solar energy application has been presented
Review on latent heat storage and problems associated with phase change mater...eSAT Journals
Abstract Energy storage devices have important role in the energy system as they minimize the mismatch between the supply and demand. This leads to improvement of the performance and the reliability of the systems. In thermal energy storage systems the Latent heat type thermal energy storages (LHTES) are attractive since they have high energy storage density and nearly isothermal operation at the phase transition temperature of the material usedthat is commonly known as phase change material (PCM). In this paper PCMs with solid-solid and solid-liquid phase transition are discussed. Though PCMs with solid-solid phase transition seem attractive due to their less stringent containment requirements but they are not widely used because of their low latent heat. PCMs with solid-liquid phase transition are the most studied and used latent heat storage materials. Those are discussed in details with their selection criterion, classification and applications. The steps involved in development of the energy storage systems and problems associated with PCMs are discussed in the next part of the paper. This will give better understanding of the latent heat storage systems to the reader. KeyWords: Latent heat storage (LHS), Phase change materials (PCM), Thermal conductivity, Thermal cycling.
Experimental analysis of a flat plate solar collector with integrated latent heat thermal storage
*Mauricio, Carmona1, Mario Palacio2, ArnoldMartínez3
1 Mechanical Engineering Department, Universidad del Norte, Colombia
2 Faculty of Mechanical and Industrial Engineering, Universidad PontificiaBolivariana, Colombia
3 Mechanical Engineering Department, Universidad de Córdoba, Colombia
1E mail: mycarmona@uninorte.edu.co,2E mail: mario.palaciov@upb.edu.co
A B S T R A C T
In the present paper, an experimental analysis of a solar water heating collector with an integrated latent heat storage unit is presented. With the purpose to determine the performance of a device on a lab scale, but with commercial features, a flat plate solar collector with phase change material (PCM) containers under the absorber plate was constructed and tested. PCM used was a commercial semi-refined light paraffin with a melting point of 60°C. Tests were carried out in outdoor conditions from October 2016 to March 2017 starting at 7:00 AM until the collector does not transfer heat to the water after sunset. Performance variables as water inlet temperature, outlet temperature, mass flow and solar radiation were measured in order to determine a useful heat and the collector efficiency. Furthermore, operating temperatures of the glass cover, air gap, absorber plate, and PCM containers are presented. Other external variables as ambient temperature, humidity and wind speed were measured with a weather station located next to the collector. The developed prototype reached an average thermal efficiency of 24.11% and a maximum outlet temperature of 50°C. Results indicate that the absorber plate reached the PCM melting point in few cases, this suggests that the use of a PCM with a lower melting point could be a potential strategy to increase thermal storage. A thermal analysis and conclusions of the device performance are discussed.
A (brief) preview of Phase-change material as Thermal energy storage.
Energy demands vary on daily, weekly and seasonal bases. TES is helpful for balancing
between the supply and demand of energy.
Thermal energy storage (TES) is defined as the temporary holding of thermal energy in the form of hot or cold substances for later utilization.
TES systems deal with the storage of energy by cooling, heating, melting, solidifying or vaporizing a material and the thermal energy becomes available when the process is reversed.
TES system for a particular application depends on storage duration, economics, supply and utilization temperature requirements, storage capacity, heat losses and available
Space.
“SEMINAR REPORT ON SOLAR ASSISTED VAPOUR ADSORPTION REFRIGERATION SYSTEM”Bhagvat Wadekar
SUMMARY
The range of COP for the Solar VAdRS is 0.2 - 0.7. The development of adsorption system for refrigeration is promising. An overall thermodynamics-based comparison of sorption systems shows that the performance of adsorption systems depends highly on both the adsorption pairs and processes. The technology continues to develop and the cost of producing power with solar thermal adsorption refrigeration is falling. If the costs of fossil fuels, transportation, energy conversion, electricity transmission and system maintenance are taken into account, the cost of energy produced by solar thermal adsorption systems would be much lower than that for conventional refrigeration systems.
The intermittent system has its simplicity and cost effectiveness. However, the main disadvantages such as long adsorption/desorption time have become obstacles for commercial production of the system. Hence, to compete with conventional vapor compression technologies, more efforts should be made in enhancing the COP and SCP. The environmental benefits of this technology and its non-dependence on conventional energy sources makes it highly attractive for further developments and a potential alternative to conventional systems in the future. The future of solar refrigeration and air conditioning seems to be a very good proposition and no doubt will find its place in future industrial applications. The major limiting factor at present is the shape of energy so as to make it available whenever it is required, for example at nights and extended cloudy days when we cannot attain a high enough temperature.
“PRESENTATION ON SOLAR ASSISTED VAPOUR ADSORPTION REFRIGERATION SYSTEM”Bhagvat Wadekar
SUMMARY
The range of COP for the Solar VAdRS is 0.2 - 0.7. The development of adsorption system for refrigeration is promising. An overall thermodynamics-based comparison of sorption systems shows that the performance of adsorption systems depends highly on both the adsorption pairs and processes. The technology continues to develop and the cost of producing power with solar thermal adsorption refrigeration is falling. If the costs of fossil fuels, transportation, energy conversion, electricity transmission and system maintenance are taken into account, the cost of energy produced by solar thermal adsorption systems would be much lower than that for conventional refrigeration systems.
The intermittent system has its simplicity and cost effectiveness. However, the main disadvantages such as long adsorption/desorption time have become obstacles for commercial production of the system. Hence, to compete with conventional vapor compression technologies, more efforts should be made in enhancing the COP and SCP. The environmental benefits of this technology and its non-dependence on conventional energy sources makes it highly attractive for further developments and a potential alternative to conventional systems in the future. The future of solar refrigeration and air conditioning seems to be a very good proposition and no doubt will find its place in future industrial applications. The major limiting factor at present is the shape of energy so as to make it available whenever it is required, for example at nights and extended cloudy days when we cannot attain a high enough temperature.
• Design and fabrication of a Vapor absorption Refrigeration using solar energy.Nagaraja D Shenoy
The use of solar energy to power refrigeration with replacing the compression cycle with vapor absorption cycle strives to minimize the negative impacts refrigerators have on the environment and energy. Replacing the electrical energy with solar energy will reduce the consumption of high grade electrical energy. Ammonia being an environmentally friendly gas reduces the effect of ozone layer depletion and global warming by artificial refrigerants. This project deals with a model solar thermal refrigeration system using NH3-H2O vapor absorption system
Performance Improvement of Solar PV Cells using Various Cooling Methods: A Re...rahulmonikasharma
the operating surface is a key operational factor to take into consideration to achieve higher efficiency when operating solar photovoltaic system. Proper cooling can improve the electric efficiency and decrease the rate of cell degradation with time, resulting in maximization of the life span of photovoltaic modules. The excessive heat removed by the cooling system used in domestic, commercial or industrial applications. Various cooling methods available for PV cells Such as Active and Passive cooling system. In this paper use various cooling methods for PV panel. Just like it heat pipe, floating, PCM used in back side of PV panel, evaporative cooling for PV panel.
electricity generation from waste heat of gas.Vikas Rathod
Waste heat is by necessity produced both by machines that do work and in other processes that use energy, for example in a refrigerator warming the room air or a combustion engine releasing heat into the environment.
The need for many systems to reject heat as a by-product of their operation is fundamental to the laws of thermodynamics. Waste heat has lower utility (or in thermodynamics lexicon a lower exergy or higher entropy) than the original energy source.
Introduction to solar thermal system
Working of solar thermal system
Solar collector
Type of solar collector
Solar water heater
Solar heating and cooling
Solar refrigeration and air conditioning
Advantage and Disadvantages
A (brief) preview of Phase-change material as Thermal energy storage.
Energy demands vary on daily, weekly and seasonal bases. TES is helpful for balancing
between the supply and demand of energy.
Thermal energy storage (TES) is defined as the temporary holding of thermal energy in the form of hot or cold substances for later utilization.
TES systems deal with the storage of energy by cooling, heating, melting, solidifying or vaporizing a material and the thermal energy becomes available when the process is reversed.
TES system for a particular application depends on storage duration, economics, supply and utilization temperature requirements, storage capacity, heat losses and available
Space.
“SEMINAR REPORT ON SOLAR ASSISTED VAPOUR ADSORPTION REFRIGERATION SYSTEM”Bhagvat Wadekar
SUMMARY
The range of COP for the Solar VAdRS is 0.2 - 0.7. The development of adsorption system for refrigeration is promising. An overall thermodynamics-based comparison of sorption systems shows that the performance of adsorption systems depends highly on both the adsorption pairs and processes. The technology continues to develop and the cost of producing power with solar thermal adsorption refrigeration is falling. If the costs of fossil fuels, transportation, energy conversion, electricity transmission and system maintenance are taken into account, the cost of energy produced by solar thermal adsorption systems would be much lower than that for conventional refrigeration systems.
The intermittent system has its simplicity and cost effectiveness. However, the main disadvantages such as long adsorption/desorption time have become obstacles for commercial production of the system. Hence, to compete with conventional vapor compression technologies, more efforts should be made in enhancing the COP and SCP. The environmental benefits of this technology and its non-dependence on conventional energy sources makes it highly attractive for further developments and a potential alternative to conventional systems in the future. The future of solar refrigeration and air conditioning seems to be a very good proposition and no doubt will find its place in future industrial applications. The major limiting factor at present is the shape of energy so as to make it available whenever it is required, for example at nights and extended cloudy days when we cannot attain a high enough temperature.
“PRESENTATION ON SOLAR ASSISTED VAPOUR ADSORPTION REFRIGERATION SYSTEM”Bhagvat Wadekar
SUMMARY
The range of COP for the Solar VAdRS is 0.2 - 0.7. The development of adsorption system for refrigeration is promising. An overall thermodynamics-based comparison of sorption systems shows that the performance of adsorption systems depends highly on both the adsorption pairs and processes. The technology continues to develop and the cost of producing power with solar thermal adsorption refrigeration is falling. If the costs of fossil fuels, transportation, energy conversion, electricity transmission and system maintenance are taken into account, the cost of energy produced by solar thermal adsorption systems would be much lower than that for conventional refrigeration systems.
The intermittent system has its simplicity and cost effectiveness. However, the main disadvantages such as long adsorption/desorption time have become obstacles for commercial production of the system. Hence, to compete with conventional vapor compression technologies, more efforts should be made in enhancing the COP and SCP. The environmental benefits of this technology and its non-dependence on conventional energy sources makes it highly attractive for further developments and a potential alternative to conventional systems in the future. The future of solar refrigeration and air conditioning seems to be a very good proposition and no doubt will find its place in future industrial applications. The major limiting factor at present is the shape of energy so as to make it available whenever it is required, for example at nights and extended cloudy days when we cannot attain a high enough temperature.
• Design and fabrication of a Vapor absorption Refrigeration using solar energy.Nagaraja D Shenoy
The use of solar energy to power refrigeration with replacing the compression cycle with vapor absorption cycle strives to minimize the negative impacts refrigerators have on the environment and energy. Replacing the electrical energy with solar energy will reduce the consumption of high grade electrical energy. Ammonia being an environmentally friendly gas reduces the effect of ozone layer depletion and global warming by artificial refrigerants. This project deals with a model solar thermal refrigeration system using NH3-H2O vapor absorption system
Performance Improvement of Solar PV Cells using Various Cooling Methods: A Re...rahulmonikasharma
the operating surface is a key operational factor to take into consideration to achieve higher efficiency when operating solar photovoltaic system. Proper cooling can improve the electric efficiency and decrease the rate of cell degradation with time, resulting in maximization of the life span of photovoltaic modules. The excessive heat removed by the cooling system used in domestic, commercial or industrial applications. Various cooling methods available for PV cells Such as Active and Passive cooling system. In this paper use various cooling methods for PV panel. Just like it heat pipe, floating, PCM used in back side of PV panel, evaporative cooling for PV panel.
electricity generation from waste heat of gas.Vikas Rathod
Waste heat is by necessity produced both by machines that do work and in other processes that use energy, for example in a refrigerator warming the room air or a combustion engine releasing heat into the environment.
The need for many systems to reject heat as a by-product of their operation is fundamental to the laws of thermodynamics. Waste heat has lower utility (or in thermodynamics lexicon a lower exergy or higher entropy) than the original energy source.
Introduction to solar thermal system
Working of solar thermal system
Solar collector
Type of solar collector
Solar water heater
Solar heating and cooling
Solar refrigeration and air conditioning
Advantage and Disadvantages
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Evolution of Quality Control, concept change, TQM Modern concept, Quality concept in design, Review of design, Evolution of proto type. Control on Purchased Product: Procurement of various products, evaluation of supplies, capacity verification, Development of sources, procurement procedure. Manufacturing Quality: Methods and techniques for manufacture, inspection and control of product, quality in sales and services, guarantee, analysis of claims.
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Did you mean: Evolution of Quality Control, concept change, TQM Modern concept, Quality concept in design, Review of design, Evolution of prototype. Control on Purchased Product: Procurement of various products, evaluation of supplies, capacity verification, Development of sources, procurement procedure. Manufacturing Quality: Methods and techniques for manufacture, inspection and control of product, quality in sales and services, guarantee, analysis of claims.
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Willie Nelson is a name that resonates within the world of music and entertainment. Known for his unique voice, and masterful guitar skills. and an extraordinary career spanning several decades. Nelson has become a legend in the country music scene. But, his influence extends far beyond the realm of music. with ventures in acting, writing, activism, and business. This comprehensive article delves into Willie Nelson net worth. exploring the various facets of his career that have contributed to his large fortune.
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Introduction
Willie Nelson net worth is a testament to his enduring influence and success in many fields. Born on April 29, 1933, in Abbott, Texas. Nelson's journey from a humble beginning to becoming one of the most iconic figures in American music is nothing short of inspirational. His net worth, which estimated to be around $25 million as of 2024. reflects a career that is as diverse as it is prolific.
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Humble Origins
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A novel latent heat storage for solar space heating system: Refrigeration storage
1. A NOVEL LATENT HEAT STORAGE FOR SOLAR SPACE
HEATING SYSTEMS: REFRIGERANT STORAGE
2. Introduction
• Solar absorption refrigeration systems 1 - 3 used for comfort cooling of buildings
are gaining in popularity since the energy crisis. Because solar input is variable and
intermittent and the demand for heating/cooling is time dependent, energy storage
is an essential part of any solar energy system for space heating/cooling.
• A solar absorption refrigerator is a heat operated machine which includes a
generator, a condenser, an evaporator and an absorber together with a heat
exchanger, a mechanical pump and an expansion valve (Fig. 1).
• In the absorber, gaseous refrigerant from the evaporator is dissolved in an
absorbent liquid with a strong affinity for the gas and a low concentration of it.
• After the absorber, this liquid, now rich in refrigerant, is pumped to a generator at
the high pressure of the system and heated by solar energy to produce superheated
refrigerant gas and a solution, weak in refrigerant. The latter is returned to the
absorber to complete its cycle while the former flows to the condenser where it is
liquefied by ambient cooling.
4. • After the absorber, this liquid, now rich in refrigerant, is pumped to a
generator at the high pressure of the system and heated by solar energy
to produce superheated refrigerant gas and a solution, weak in
refrigerant. The latter is returned to the absorber to complete its cycle
while the former flows to the condenser where it is liquefied by ambient
cooling.
• After passing through an expansion valve, the fluid is evaporated at the
low pressure of the system by withdrawing heat from the room air. The
resulting gas goes to the absorber to complete its cycle.
• Since the absorption process is exothermic, heat must be removed from
the absorber to keep its temperature low and ensure continued
absorption of the incoming gas.
5. Novel Latent Heat Storage
• In solar absorption refrigeration systems, the amount of refrigerant
generated is dependent on the heat transferred to the generator from the
solar collector and hence on the solar insolation. Thus, the amount of
refrigerant generated tends to reach a peak at about noon when the solar
flux is high. However, due to the thermal inertia of the building structure,
the cooling load reaches a peak some time afterwards.
• In winter, the heating load reaches a peak during the night. Thus, for
year-round air-conditioning, some form of heat/cold storage is always
necessary to compensate for the phase difference between energy input
and demand.
6. Conventional Storage Systems
• Solar energy can be stored as sensible heat in water or rocks; however, the storage capacity per unit
volume of these systems is limited by the specific heat of the storage material and the relatively small
temperature differences available in building applications. Although the rock pile system is a re-
generative heat exchanger and promises a good effectiveness, the energy recovery at usual
temperatures is not as high as is desirable. Moreover, the storage systems are bulky and have a poor
thermal response.
• Recently, some latent heat storage systems, involving phase change in solids, have been proposed and
investigated for low temperature thermal storage in solar energy applications; however, even for these
systems there are some major drawbacks, as follows.
(i) Loss of performance on recycling, due to separation of components in the case of salt hydrates
and to decomposition in the case of some paraffins.
(ii) The poor thermal conductivity of the medium necessitates a large contact surface with the heat
exchange fluid and increases the gross storage volume.
(iii) The systems are expensive.
• Thus, at present, although solar energy is cost competitive with other energy sources for space
heating/cooling of buildings, there are practical difficulties with available means of thermal energy
storage. A storage system with improved performance could enhance the viability of solar heating and
cooling systems.
7. Concept of Refrigerant Storage
• For cooling applications using solar absorption refrigeration systems, the concept of
refrigerant storage is basically to provide, in association with the condenser, a
storage volume where the refrigerant can be accumulated during the hours of high
solar insolation.
• The stored liquid refrigerant is released into the evaporator as necessary to satisfy
the cooling load. Storage is also needed in the absorber to store not only the
refrigerant but also sufficient absorbent to keep the concentration within allowable
limits (Fig. 2).
• By careful matching of the system components, operational advantages, such as
early start up with low concentration solution and use of high concentrations when
the highest temperatures are available, can produce an improved daily performance.
A suitable working fluid for solar space cooling systems is lithium bromide-water
solution.
8. Fig. 2. Solar absorption refrigeration system for space cooling with refrigerant storage
9. • The calculated energy transfer rates for various components of the refrigeration system
(QG-generator heat input; Qc condenser heat output; QE--evaporator heat input and the
desired QB—building cooling load) are shown in Fig. 3.
Fig. 3. Hourly variation of heat transfer rate in various
components of the cooling system with a given building load.
It is seen that generation starts early in
the morning as a result of the low
concentration. For a short period after
starting, the refrigerant generated is
nearly all required to meet the building
load. Thus the storage rate is small, as is
the concentration change
10. • The system temperatures (Tt -generator temperature; TA absorber temperature and Te-
evaporator temperature) are shown in Fig. 4.
Fig. 4. Hourly variation of the system
temperature with a given building load
The evaporator temperature continues to rise
until the building demand starts to increase
after 10.00h (Fig. 4). At that time, the
combination of generator temperature and
absorber temperature allows the evaporator
temperature to decrease, with the result that
the load capability of the evaporator is
increased. The storage rate also increases from
the low value at the commencement of
generation.
11. • To understand the operation of refrigerant storage, the variation of the refrigerant
mass in the store is given as a function of time (Fig. 5); the variation of the incident
solar radiation intensity has also been depicted in the fig. below
Fig. 5. Hourly variation of mass of refrigerant in
store and solar radiation intensity incident on the
collector with a given building load.
It can be seen that generation of
refrigerant ceases several hours before
sunset although a significant amount of
energy is still being collected; the stoppage
occurs because of the high boiling point of
the solution which has become highly
concentrated with so much refrigerant in
the store. During the night, as the
refrigerant flows from the store to the
absorber, the evaporator cooling rate
continually decreases as the solution
concentration decreases and causes a high
pressure and temperature in the
evaporator.
12. Concept of Solar Heat Pump Operation with Refrigerant
Storage
• As the heating load of a building is out of phase with the solar energy input,
generally larger storage capacities will be required than for equivalent space cooling
systems.
• Storage in solar space heating systems can be improved by using the concept of a
solar powered absorption heat pump. Because the absorber temperature in an
absorption heat pump system can be as high as 50 °C and heat must be removed
from the absorber to keep the temperature (and the corresponding refrigerant
vapour pressure) low, it appeared to the authors that the heat pump system with
refrigerant storage was worth investigating for winter heating.
• In the storage mode, refrigerant will be boiled from solution by solar energy in the
daytime and condensed for storage in the condenser store as in the cooling cycle.
• When space heating is needed, the condensed refrigerant will be evaporated in an
outdoor air or water coil before being dissolved back into the solution in the
absorber.
13. • The heat of solution in the absorber will be the energy source for space heating. Thus
it is possible to utilise the latent heat of the refrigerant solution as internal storage in
a solar absorption heat-pump system (Fig. 6).
Fig. 6. Solar absorption refrigeration system
for space heating with refrigerant storage.
A suitable absorbent-refrigerant combination
for solar heating may be water ammonia. A
first approximation of heat transfer rates in
the proposed system can be made by steady
state-thermodynamic analysis. The basic
mass balance and energy balance equations
for the various components of the system can
be solved to give a numerical estimate of the
rates of heat transfer and system
temperatures for winter heating conditions
and given building load. However, a more
dynamic transient model to optimise the
system parameters is needed in the realistic
situation.
14. Solar Absorption Refrigeration System’s Advantages
(over other storage)
The concept of refrigerant storage in solar absorption refrigeration systems is
fundamentally sound and has the following advantages over other storage systems:
(i) The energy storage per unit volume is large as the latent heat of vaporisation of the
refrigerant/absorbent is high.
(ii) The refrigerant is stored at near ambient temperatures where heat losses from the
storage are minimal.
(iii) A further advantage is achieved in the lithium-bromide-water cycle that the storage
pressure is low so that the strength of the storage vessel is not critical.
While the LiBr-H20 system has some advantages for cooling, it is possible that other
combinations may be more successful for a heating system or where combined heating and
cooling is needed. If the system can be extended for year-round operation--cooling in summer
and heating in winter--there is a better chance of economic viability as a greater amount of
useful energy will be produced from substantially the same investment.