SlideShare a Scribd company logo
Psychrometric Chart
How to read
Dr. K. S. Baig
Department of Chemical Engineering
WEC, Wah University
We have 100 lbs of dry air at relative humidity of 40 % , its dry bulb
temperature is 87 oF
When humid air cools it each to a temperature when saturated vapors begin to
condense called dew point.
This cooling process decrease the dry bulb temperature.
Draw horizontal lines from right to left
at a constant humidity ratio,
reaching the saturation line.
As a result of cooling dry bulb
temperature decrease.
How to work ?
Locate a point …
Locate a point
At least 2 values are required.
Here we have
Dry Bulb Temperature
and % relative humidity
To find out Humidity ratio or moisture contents
… move along dry-bulb temperature line
(x-axis) towards right hand side
To find Dew Point
Draw a horizontal line to the left
All the way to the saturation curve
To find out Enthalpy
Follow the wet bulb line upward line to the left
To the saturation curve to obtain
Wet Bub Temperature and
To the Enthalpy in saturation
To find out Enthalpy Deviation
Move along Enthalpy Deviation Lines
To find out Humid Volume
Move along humid volume lines
and interpolate if necessary
Locate the point
To find out
Humidity Ratio or
Moisture Contents
To find out Dew Point
To find out Relative Humidity
Enthalpy at saturation
Follow the wet bulb line to Enthalpy Scale
to get Enthalpy at Saturation
Follow the Enthalpy Deviation Line
to get actual enthalpy of the air
Humid Volume by
interpolating
Procedure to read
Psychometric Chart
Step 1. Locate the dry bulb temperature along the bottom axis and the associated
vertical line for each temperature. This scale will be in degrees F or degrees C.
Step 2. Locate the ‘humidity ratio’ along the right vertical axis. Humidity ratio units are
grains of moisture per pound of dry air or grams of moisture per kilogram of dry air.
The term ‘humidity ratio’ is sometimes used interchangeably with the term ‘mixing
ratio’.
Step 3. Locate the left most curved line. This is the saturation curve where the relative
humidity is 100%.
Other properties of the saturation curve include; dew point temperature = dry bulb
temperature; wet bulb temperature = dry bulb temperature; partial pressure of water
vapor = saturation vapor pressure.
Step 4. Locate the interior curved lines. Each of the lines represents a certain level of
relative humidity in percent.
Step 5. On the right side of the chart, locate the vertical line labeled ‘Dew Point’. Dew
point is expressed as a temperature. The dew point lines traverse the chart as horizontal
lines. What this tells you is that dew point does not change as the dry bulb temperature
varies.
Step 6. On the other side of the vertical line where you located dew point is the scale for
vapor pressure expressed in inches of mercury or millibars. Vapor pressure lines also
traverse the chart as horizontal lines.
Step 7. Look at the information on all sides of the chart that is on the most extreme edge.
These scales represent enthalpy expressed in BTU per pound of dry air. If you take a
ruler, you could match the scales diagonally across the chart.
Step 8. Look closely and find a second set of diagonal lines representing web bulb
temperature expressed as degrees F or degrees C. Although the wet bulb lines are close
to the enthalpy lines, they are not actually parallel to each other.
Tips and tricks for the psychrometric chart
As long as you have any 2 parameters where the lines will cross each other, you can
determine all other parameters.
For example, let’s say you know the dry bulb temperature is 70 degrees F and the
dew point is 50 degrees F. Take a ruler and draw a vertical line at the dry bulb temperature
of 70 and draw a horizontal line where the dew point is 50. The point where two lines
intersect is known as a ‘state point’. Plot the state point and you can also read the relative
humidity, wet bulb, enthalpy, vapor pressure and humidity ratio.
As another example, let’s say you know that the wet bulb temperature is 50 and the dry
bulb temperature is 75. Plot the state point and read the rest of the parameters
If you wanted to know the cooling effect of an evaporative cooler,
plot the state point where the dry bulb temperature line and the wet bulb
temperature line intersect. Or
you could plot the point where the dry bulb temperature and the relative humidity
intersect.
Follow the wet bulb line all the way to the saturation curve. Then read the dry
bulb temperature at that saturation point.
The difference between the temperature at the original point and the final
point is your effective cooling of the air.

More Related Content

What's hot

Humidity control
Humidity controlHumidity control
DEW POINT
DEW POINTDEW POINT
DEW POINT
Ali baloch
 
factors affecting Evaporation
factors affecting Evaporationfactors affecting Evaporation
factors affecting Evaporation
deepak190
 
EVAPORATION
EVAPORATIONEVAPORATION
EVAPORATION
Binuja S.S
 
Presentation
PresentationPresentation
Presentation
maa924gourav
 
Evaporation presentation
Evaporation presentationEvaporation presentation
Evaporation presentation
Zulcaif Ahmad
 
Evaporator performance
Evaporator performanceEvaporator performance
Evaporator performance
Mamta Sahurkar
 
1.Humidification-Lec. 1.pptx
1.Humidification-Lec. 1.pptx1.Humidification-Lec. 1.pptx
1.Humidification-Lec. 1.pptx
TaqqiHaider
 
1.2 Flash distillation
1.2 Flash distillation1.2 Flash distillation
Fans and blower
Fans and blowerFans and blower
Fans and blower
Abhishek Mendhe
 
Heat transfer By Ankita Yagnik
Heat transfer By Ankita YagnikHeat transfer By Ankita Yagnik
Heat transfer By Ankita Yagnik
Ankita Yagnik
 
venturi_meter ppt(2)
venturi_meter ppt(2)venturi_meter ppt(2)
venturi_meter ppt(2)
Syed Ali Ikram
 
Refrigeration and Air Conditioning System Components
Refrigeration and Air Conditioning System ComponentsRefrigeration and Air Conditioning System Components
Refrigeration and Air Conditioning System Components
Ajaypalsinh Barad
 
Presentation cooling tower
Presentation cooling towerPresentation cooling tower
Presentation cooling tower
ALOK KUMAR SWAIN
 
cooling towers
cooling towerscooling towers
cooling towers
Khalid Nawaz
 
Refrigeration cycle
Refrigeration cycleRefrigeration cycle
Refrigeration cycle
vidya Alex
 
Orifice Meter
Orifice Meter Orifice Meter
Orifice Meter
ARUNANGSHU CHAKRABORTY
 
Venturimeter,orificemter and pitot tube
Venturimeter,orificemter and pitot tubeVenturimeter,orificemter and pitot tube
Venturimeter,orificemter and pitot tube
Pranit Mehta
 
Chiller water systems
Chiller water systemsChiller water systems
Chiller water systems
RIDDHESH VARIK
 
Hvac psychrometry and concepts
Hvac psychrometry and conceptsHvac psychrometry and concepts
Hvac psychrometry and concepts
Aishwarya Deopujari
 

What's hot (20)

Humidity control
Humidity controlHumidity control
Humidity control
 
DEW POINT
DEW POINTDEW POINT
DEW POINT
 
factors affecting Evaporation
factors affecting Evaporationfactors affecting Evaporation
factors affecting Evaporation
 
EVAPORATION
EVAPORATIONEVAPORATION
EVAPORATION
 
Presentation
PresentationPresentation
Presentation
 
Evaporation presentation
Evaporation presentationEvaporation presentation
Evaporation presentation
 
Evaporator performance
Evaporator performanceEvaporator performance
Evaporator performance
 
1.Humidification-Lec. 1.pptx
1.Humidification-Lec. 1.pptx1.Humidification-Lec. 1.pptx
1.Humidification-Lec. 1.pptx
 
1.2 Flash distillation
1.2 Flash distillation1.2 Flash distillation
1.2 Flash distillation
 
Fans and blower
Fans and blowerFans and blower
Fans and blower
 
Heat transfer By Ankita Yagnik
Heat transfer By Ankita YagnikHeat transfer By Ankita Yagnik
Heat transfer By Ankita Yagnik
 
venturi_meter ppt(2)
venturi_meter ppt(2)venturi_meter ppt(2)
venturi_meter ppt(2)
 
Refrigeration and Air Conditioning System Components
Refrigeration and Air Conditioning System ComponentsRefrigeration and Air Conditioning System Components
Refrigeration and Air Conditioning System Components
 
Presentation cooling tower
Presentation cooling towerPresentation cooling tower
Presentation cooling tower
 
cooling towers
cooling towerscooling towers
cooling towers
 
Refrigeration cycle
Refrigeration cycleRefrigeration cycle
Refrigeration cycle
 
Orifice Meter
Orifice Meter Orifice Meter
Orifice Meter
 
Venturimeter,orificemter and pitot tube
Venturimeter,orificemter and pitot tubeVenturimeter,orificemter and pitot tube
Venturimeter,orificemter and pitot tube
 
Chiller water systems
Chiller water systemsChiller water systems
Chiller water systems
 
Hvac psychrometry and concepts
Hvac psychrometry and conceptsHvac psychrometry and concepts
Hvac psychrometry and concepts
 

Similar to Psychrometric chart, How to read

chemical.pptx
chemical.pptxchemical.pptx
chemical.pptx
LAXMI DEEPAK BHATLU M
 
5 Common Questions Involving Psychrometrics
5 Common Questions Involving Psychrometrics5 Common Questions Involving Psychrometrics
5 Common Questions Involving Psychrometrics
Alaa Alsaqer
 
Graduation project presentation
Graduation project presentationGraduation project presentation
Graduation project presentation
Bright Benjamin
 
basics of psychrometrics-f.ppt
basics of psychrometrics-f.pptbasics of psychrometrics-f.ppt
basics of psychrometrics-f.ppt
vinothkumar557149
 
Sychrometric.pptx
Sychrometric.pptxSychrometric.pptx
Sychrometric.pptx
Muhammad Shoaib
 
Psychometry
PsychometryPsychometry
Psychometry
Pranit Mehta
 
5 200
5 2005 200
245887main meteorology teacherres-ch11.r3
245887main meteorology teacherres-ch11.r3245887main meteorology teacherres-ch11.r3
245887main meteorology teacherres-ch11.r3
Tanvir Shovon
 
Psychrometrics
Psychrometrics Psychrometrics
Psychrometrics
WasifRazzaq2
 
UNIT-2_Part1_NOTES-PKNAG-SPATI.pdf
UNIT-2_Part1_NOTES-PKNAG-SPATI.pdfUNIT-2_Part1_NOTES-PKNAG-SPATI.pdf
UNIT-2_Part1_NOTES-PKNAG-SPATI.pdf
YOGESH AHIRE
 
Chapter 7 pure substance
Chapter 7 pure substanceChapter 7 pure substance
Chapter 7 pure substance
Aaba Tambe
 
Instrumentation and control
Instrumentation and controlInstrumentation and control
Instrumentation and control
Salih Abker Adam Musa
 
Sychrometrc.pptx
Sychrometrc.pptxSychrometrc.pptx
Sychrometrc.pptx
Muhammad Shoaib
 
Sheet1Initial Popluation0Rate 10Rate 20Rate 30Time (years)Future P.docx
Sheet1Initial Popluation0Rate 10Rate 20Rate 30Time (years)Future P.docxSheet1Initial Popluation0Rate 10Rate 20Rate 30Time (years)Future P.docx
Sheet1Initial Popluation0Rate 10Rate 20Rate 30Time (years)Future P.docx
lesleyryder69361
 
Pure Substance Pure substance is a chemically homogenous s.docx
Pure Substance Pure substance is a chemically homogenous s.docxPure Substance Pure substance is a chemically homogenous s.docx
Pure Substance Pure substance is a chemically homogenous s.docx
amrit47
 
Building Services (HVAC)
Building Services (HVAC)Building Services (HVAC)
Building Services (HVAC)
KishAgrwa1
 
Module (1.2) psychometrics-air parameters-hvac_by ss-eng. juma
Module (1.2) psychometrics-air parameters-hvac_by ss-eng. jumaModule (1.2) psychometrics-air parameters-hvac_by ss-eng. juma
Module (1.2) psychometrics-air parameters-hvac_by ss-eng. juma
Juma Yousef J. Saleh جمعة يوسف جمعة صالح
 
BC Chemistry 162 Laboratory Manual Experiment 6 Vapor Press.docx
BC Chemistry 162 Laboratory Manual Experiment 6 Vapor Press.docxBC Chemistry 162 Laboratory Manual Experiment 6 Vapor Press.docx
BC Chemistry 162 Laboratory Manual Experiment 6 Vapor Press.docx
rosemaryralphs52525
 
Distillation i
Distillation iDistillation i
Distillation i
Pradipta Lenka
 
chapter-4.pptx
chapter-4.pptxchapter-4.pptx
chapter-4.pptx
dejene1234567
 

Similar to Psychrometric chart, How to read (20)

chemical.pptx
chemical.pptxchemical.pptx
chemical.pptx
 
5 Common Questions Involving Psychrometrics
5 Common Questions Involving Psychrometrics5 Common Questions Involving Psychrometrics
5 Common Questions Involving Psychrometrics
 
Graduation project presentation
Graduation project presentationGraduation project presentation
Graduation project presentation
 
basics of psychrometrics-f.ppt
basics of psychrometrics-f.pptbasics of psychrometrics-f.ppt
basics of psychrometrics-f.ppt
 
Sychrometric.pptx
Sychrometric.pptxSychrometric.pptx
Sychrometric.pptx
 
Psychometry
PsychometryPsychometry
Psychometry
 
5 200
5 2005 200
5 200
 
245887main meteorology teacherres-ch11.r3
245887main meteorology teacherres-ch11.r3245887main meteorology teacherres-ch11.r3
245887main meteorology teacherres-ch11.r3
 
Psychrometrics
Psychrometrics Psychrometrics
Psychrometrics
 
UNIT-2_Part1_NOTES-PKNAG-SPATI.pdf
UNIT-2_Part1_NOTES-PKNAG-SPATI.pdfUNIT-2_Part1_NOTES-PKNAG-SPATI.pdf
UNIT-2_Part1_NOTES-PKNAG-SPATI.pdf
 
Chapter 7 pure substance
Chapter 7 pure substanceChapter 7 pure substance
Chapter 7 pure substance
 
Instrumentation and control
Instrumentation and controlInstrumentation and control
Instrumentation and control
 
Sychrometrc.pptx
Sychrometrc.pptxSychrometrc.pptx
Sychrometrc.pptx
 
Sheet1Initial Popluation0Rate 10Rate 20Rate 30Time (years)Future P.docx
Sheet1Initial Popluation0Rate 10Rate 20Rate 30Time (years)Future P.docxSheet1Initial Popluation0Rate 10Rate 20Rate 30Time (years)Future P.docx
Sheet1Initial Popluation0Rate 10Rate 20Rate 30Time (years)Future P.docx
 
Pure Substance Pure substance is a chemically homogenous s.docx
Pure Substance Pure substance is a chemically homogenous s.docxPure Substance Pure substance is a chemically homogenous s.docx
Pure Substance Pure substance is a chemically homogenous s.docx
 
Building Services (HVAC)
Building Services (HVAC)Building Services (HVAC)
Building Services (HVAC)
 
Module (1.2) psychometrics-air parameters-hvac_by ss-eng. juma
Module (1.2) psychometrics-air parameters-hvac_by ss-eng. jumaModule (1.2) psychometrics-air parameters-hvac_by ss-eng. juma
Module (1.2) psychometrics-air parameters-hvac_by ss-eng. juma
 
BC Chemistry 162 Laboratory Manual Experiment 6 Vapor Press.docx
BC Chemistry 162 Laboratory Manual Experiment 6 Vapor Press.docxBC Chemistry 162 Laboratory Manual Experiment 6 Vapor Press.docx
BC Chemistry 162 Laboratory Manual Experiment 6 Vapor Press.docx
 
Distillation i
Distillation iDistillation i
Distillation i
 
chapter-4.pptx
chapter-4.pptxchapter-4.pptx
chapter-4.pptx
 

More from K. Shahzad Baig

Income tax
Income taxIncome tax
Income tax
K. Shahzad Baig
 
Nominal and Effective Interest Rate
Nominal and Effective Interest RateNominal and Effective Interest Rate
Nominal and Effective Interest Rate
K. Shahzad Baig
 
Interest Why Engineers should know ?
InterestWhy Engineers should know ?InterestWhy Engineers should know ?
Interest Why Engineers should know ?
K. Shahzad Baig
 
Projects, Investment, Profitability
Projects, Investment, ProfitabilityProjects, Investment, Profitability
Projects, Investment, Profitability
K. Shahzad Baig
 
Taxes and Insurance Engineering point of view
Taxes and InsuranceEngineering point of viewTaxes and InsuranceEngineering point of view
Taxes and Insurance Engineering point of view
K. Shahzad Baig
 
Estimation of Fixed Capital Cost
Estimation of Fixed Capital CostEstimation of Fixed Capital Cost
Estimation of Fixed Capital Cost
K. Shahzad Baig
 
Summary of Production Costs
Summary of Production CostsSummary of Production Costs
Summary of Production Costs
K. Shahzad Baig
 
Purchase Cost of Miscellaneous Equipment
Purchase Cost of Miscellaneous EquipmentPurchase Cost of Miscellaneous Equipment
Purchase Cost of Miscellaneous Equipment
K. Shahzad Baig
 
Mass Transfer Equipment Cost
Mass Transfer Equipment CostMass Transfer Equipment Cost
Mass Transfer Equipment Cost
K. Shahzad Baig
 
HEAT-TRANSFER EQUIPMENT COSTS
HEAT-TRANSFER EQUIPMENT COSTSHEAT-TRANSFER EQUIPMENT COSTS
HEAT-TRANSFER EQUIPMENT COSTS
K. Shahzad Baig
 
Gross Profit, Net Profit
Gross Profit, Net ProfitGross Profit, Net Profit
Gross Profit, Net Profit
K. Shahzad Baig
 
Manufacturing Costs
Manufacturing Costs Manufacturing Costs
Manufacturing Costs
K. Shahzad Baig
 
Capital Investment
Capital InvestmentCapital Investment
Capital Investment
K. Shahzad Baig
 
Cost Indices for Industrial Application
Cost Indices for Industrial ApplicationCost Indices for Industrial Application
Cost Indices for Industrial Application
K. Shahzad Baig
 
Estimation of Capital Investments
Estimation of Capital  Investments Estimation of Capital  Investments
Estimation of Capital Investments
K. Shahzad Baig
 
Production Costs
Production CostsProduction Costs
Production Costs
K. Shahzad Baig
 
Location of an industry
Location of an industryLocation of an industry
Location of an industry
K. Shahzad Baig
 
Fluctuation of money value with time
Fluctuation of money value with timeFluctuation of money value with time
Fluctuation of money value with time
K. Shahzad Baig
 
Economics for Engineers, Why ?
Economics for Engineers, Why ?Economics for Engineers, Why ?
Economics for Engineers, Why ?
K. Shahzad Baig
 
The Scientific Methods
The Scientific MethodsThe Scientific Methods
The Scientific Methods
K. Shahzad Baig
 

More from K. Shahzad Baig (20)

Income tax
Income taxIncome tax
Income tax
 
Nominal and Effective Interest Rate
Nominal and Effective Interest RateNominal and Effective Interest Rate
Nominal and Effective Interest Rate
 
Interest Why Engineers should know ?
InterestWhy Engineers should know ?InterestWhy Engineers should know ?
Interest Why Engineers should know ?
 
Projects, Investment, Profitability
Projects, Investment, ProfitabilityProjects, Investment, Profitability
Projects, Investment, Profitability
 
Taxes and Insurance Engineering point of view
Taxes and InsuranceEngineering point of viewTaxes and InsuranceEngineering point of view
Taxes and Insurance Engineering point of view
 
Estimation of Fixed Capital Cost
Estimation of Fixed Capital CostEstimation of Fixed Capital Cost
Estimation of Fixed Capital Cost
 
Summary of Production Costs
Summary of Production CostsSummary of Production Costs
Summary of Production Costs
 
Purchase Cost of Miscellaneous Equipment
Purchase Cost of Miscellaneous EquipmentPurchase Cost of Miscellaneous Equipment
Purchase Cost of Miscellaneous Equipment
 
Mass Transfer Equipment Cost
Mass Transfer Equipment CostMass Transfer Equipment Cost
Mass Transfer Equipment Cost
 
HEAT-TRANSFER EQUIPMENT COSTS
HEAT-TRANSFER EQUIPMENT COSTSHEAT-TRANSFER EQUIPMENT COSTS
HEAT-TRANSFER EQUIPMENT COSTS
 
Gross Profit, Net Profit
Gross Profit, Net ProfitGross Profit, Net Profit
Gross Profit, Net Profit
 
Manufacturing Costs
Manufacturing Costs Manufacturing Costs
Manufacturing Costs
 
Capital Investment
Capital InvestmentCapital Investment
Capital Investment
 
Cost Indices for Industrial Application
Cost Indices for Industrial ApplicationCost Indices for Industrial Application
Cost Indices for Industrial Application
 
Estimation of Capital Investments
Estimation of Capital  Investments Estimation of Capital  Investments
Estimation of Capital Investments
 
Production Costs
Production CostsProduction Costs
Production Costs
 
Location of an industry
Location of an industryLocation of an industry
Location of an industry
 
Fluctuation of money value with time
Fluctuation of money value with timeFluctuation of money value with time
Fluctuation of money value with time
 
Economics for Engineers, Why ?
Economics for Engineers, Why ?Economics for Engineers, Why ?
Economics for Engineers, Why ?
 
The Scientific Methods
The Scientific MethodsThe Scientific Methods
The Scientific Methods
 

Recently uploaded

SWOT analysis in the project Keeping the Memory @live.pptx
SWOT analysis in the project Keeping the Memory @live.pptxSWOT analysis in the project Keeping the Memory @live.pptx
SWOT analysis in the project Keeping the Memory @live.pptx
zuzanka
 
Nutrition Inc FY 2024, 4 - Hour Training
Nutrition Inc FY 2024, 4 - Hour TrainingNutrition Inc FY 2024, 4 - Hour Training
Nutrition Inc FY 2024, 4 - Hour Training
melliereed
 
Jemison, MacLaughlin, and Majumder "Broadening Pathways for Editors and Authors"
Jemison, MacLaughlin, and Majumder "Broadening Pathways for Editors and Authors"Jemison, MacLaughlin, and Majumder "Broadening Pathways for Editors and Authors"
Jemison, MacLaughlin, and Majumder "Broadening Pathways for Editors and Authors"
National Information Standards Organization (NISO)
 
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
PECB
 
How to Setup Warehouse & Location in Odoo 17 Inventory
How to Setup Warehouse & Location in Odoo 17 InventoryHow to Setup Warehouse & Location in Odoo 17 Inventory
How to Setup Warehouse & Location in Odoo 17 Inventory
Celine George
 
BÀI TẬP BỔ TRỢ TIẾNG ANH LỚP 9 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2024-2025 - ...
BÀI TẬP BỔ TRỢ TIẾNG ANH LỚP 9 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2024-2025 - ...BÀI TẬP BỔ TRỢ TIẾNG ANH LỚP 9 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2024-2025 - ...
BÀI TẬP BỔ TRỢ TIẾNG ANH LỚP 9 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2024-2025 - ...
Nguyen Thanh Tu Collection
 
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPLAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
RAHUL
 
Gender and Mental Health - Counselling and Family Therapy Applications and In...
Gender and Mental Health - Counselling and Family Therapy Applications and In...Gender and Mental Health - Counselling and Family Therapy Applications and In...
Gender and Mental Health - Counselling and Family Therapy Applications and In...
PsychoTech Services
 
Bonku-Babus-Friend by Sathyajith Ray (9)
Bonku-Babus-Friend by Sathyajith Ray  (9)Bonku-Babus-Friend by Sathyajith Ray  (9)
Bonku-Babus-Friend by Sathyajith Ray (9)
nitinpv4ai
 
UGC NET Exam Paper 1- Unit 1:Teaching Aptitude
UGC NET Exam Paper 1- Unit 1:Teaching AptitudeUGC NET Exam Paper 1- Unit 1:Teaching Aptitude
UGC NET Exam Paper 1- Unit 1:Teaching Aptitude
S. Raj Kumar
 
Mule event processing models | MuleSoft Mysore Meetup #47
Mule event processing models | MuleSoft Mysore Meetup #47Mule event processing models | MuleSoft Mysore Meetup #47
Mule event processing models | MuleSoft Mysore Meetup #47
MysoreMuleSoftMeetup
 
Pengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptxPengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptx
Fajar Baskoro
 
Electric Fetus - Record Store Scavenger Hunt
Electric Fetus - Record Store Scavenger HuntElectric Fetus - Record Store Scavenger Hunt
Electric Fetus - Record Store Scavenger Hunt
RamseyBerglund
 
Leveraging Generative AI to Drive Nonprofit Innovation
Leveraging Generative AI to Drive Nonprofit InnovationLeveraging Generative AI to Drive Nonprofit Innovation
Leveraging Generative AI to Drive Nonprofit Innovation
TechSoup
 
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptxRESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
zuzanka
 
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptxPrésentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
siemaillard
 
Wound healing PPT
Wound healing PPTWound healing PPT
Wound healing PPT
Jyoti Chand
 
Stack Memory Organization of 8086 Microprocessor
Stack Memory Organization of 8086 MicroprocessorStack Memory Organization of 8086 Microprocessor
Stack Memory Organization of 8086 Microprocessor
JomonJoseph58
 
مصحف القراءات العشر أعد أحرف الخلاف سمير بسيوني.pdf
مصحف القراءات العشر   أعد أحرف الخلاف سمير بسيوني.pdfمصحف القراءات العشر   أعد أحرف الخلاف سمير بسيوني.pdf
مصحف القراءات العشر أعد أحرف الخلاف سمير بسيوني.pdf
سمير بسيوني
 
How to Make a Field Mandatory in Odoo 17
How to Make a Field Mandatory in Odoo 17How to Make a Field Mandatory in Odoo 17
How to Make a Field Mandatory in Odoo 17
Celine George
 

Recently uploaded (20)

SWOT analysis in the project Keeping the Memory @live.pptx
SWOT analysis in the project Keeping the Memory @live.pptxSWOT analysis in the project Keeping the Memory @live.pptx
SWOT analysis in the project Keeping the Memory @live.pptx
 
Nutrition Inc FY 2024, 4 - Hour Training
Nutrition Inc FY 2024, 4 - Hour TrainingNutrition Inc FY 2024, 4 - Hour Training
Nutrition Inc FY 2024, 4 - Hour Training
 
Jemison, MacLaughlin, and Majumder "Broadening Pathways for Editors and Authors"
Jemison, MacLaughlin, and Majumder "Broadening Pathways for Editors and Authors"Jemison, MacLaughlin, and Majumder "Broadening Pathways for Editors and Authors"
Jemison, MacLaughlin, and Majumder "Broadening Pathways for Editors and Authors"
 
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
 
How to Setup Warehouse & Location in Odoo 17 Inventory
How to Setup Warehouse & Location in Odoo 17 InventoryHow to Setup Warehouse & Location in Odoo 17 Inventory
How to Setup Warehouse & Location in Odoo 17 Inventory
 
BÀI TẬP BỔ TRỢ TIẾNG ANH LỚP 9 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2024-2025 - ...
BÀI TẬP BỔ TRỢ TIẾNG ANH LỚP 9 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2024-2025 - ...BÀI TẬP BỔ TRỢ TIẾNG ANH LỚP 9 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2024-2025 - ...
BÀI TẬP BỔ TRỢ TIẾNG ANH LỚP 9 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2024-2025 - ...
 
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPLAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
 
Gender and Mental Health - Counselling and Family Therapy Applications and In...
Gender and Mental Health - Counselling and Family Therapy Applications and In...Gender and Mental Health - Counselling and Family Therapy Applications and In...
Gender and Mental Health - Counselling and Family Therapy Applications and In...
 
Bonku-Babus-Friend by Sathyajith Ray (9)
Bonku-Babus-Friend by Sathyajith Ray  (9)Bonku-Babus-Friend by Sathyajith Ray  (9)
Bonku-Babus-Friend by Sathyajith Ray (9)
 
UGC NET Exam Paper 1- Unit 1:Teaching Aptitude
UGC NET Exam Paper 1- Unit 1:Teaching AptitudeUGC NET Exam Paper 1- Unit 1:Teaching Aptitude
UGC NET Exam Paper 1- Unit 1:Teaching Aptitude
 
Mule event processing models | MuleSoft Mysore Meetup #47
Mule event processing models | MuleSoft Mysore Meetup #47Mule event processing models | MuleSoft Mysore Meetup #47
Mule event processing models | MuleSoft Mysore Meetup #47
 
Pengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptxPengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptx
 
Electric Fetus - Record Store Scavenger Hunt
Electric Fetus - Record Store Scavenger HuntElectric Fetus - Record Store Scavenger Hunt
Electric Fetus - Record Store Scavenger Hunt
 
Leveraging Generative AI to Drive Nonprofit Innovation
Leveraging Generative AI to Drive Nonprofit InnovationLeveraging Generative AI to Drive Nonprofit Innovation
Leveraging Generative AI to Drive Nonprofit Innovation
 
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptxRESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
RESULTS OF THE EVALUATION QUESTIONNAIRE.pptx
 
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptxPrésentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
 
Wound healing PPT
Wound healing PPTWound healing PPT
Wound healing PPT
 
Stack Memory Organization of 8086 Microprocessor
Stack Memory Organization of 8086 MicroprocessorStack Memory Organization of 8086 Microprocessor
Stack Memory Organization of 8086 Microprocessor
 
مصحف القراءات العشر أعد أحرف الخلاف سمير بسيوني.pdf
مصحف القراءات العشر   أعد أحرف الخلاف سمير بسيوني.pdfمصحف القراءات العشر   أعد أحرف الخلاف سمير بسيوني.pdf
مصحف القراءات العشر أعد أحرف الخلاف سمير بسيوني.pdf
 
How to Make a Field Mandatory in Odoo 17
How to Make a Field Mandatory in Odoo 17How to Make a Field Mandatory in Odoo 17
How to Make a Field Mandatory in Odoo 17
 

Psychrometric chart, How to read

  • 1. Psychrometric Chart How to read Dr. K. S. Baig Department of Chemical Engineering WEC, Wah University
  • 2.
  • 3. We have 100 lbs of dry air at relative humidity of 40 % , its dry bulb temperature is 87 oF When humid air cools it each to a temperature when saturated vapors begin to condense called dew point. This cooling process decrease the dry bulb temperature.
  • 4.
  • 5. Draw horizontal lines from right to left at a constant humidity ratio, reaching the saturation line. As a result of cooling dry bulb temperature decrease.
  • 6.
  • 7. How to work ? Locate a point …
  • 8. Locate a point At least 2 values are required. Here we have Dry Bulb Temperature and % relative humidity
  • 9. To find out Humidity ratio or moisture contents … move along dry-bulb temperature line (x-axis) towards right hand side
  • 10. To find Dew Point Draw a horizontal line to the left All the way to the saturation curve
  • 11. To find out Enthalpy Follow the wet bulb line upward line to the left To the saturation curve to obtain Wet Bub Temperature and To the Enthalpy in saturation
  • 12. To find out Enthalpy Deviation Move along Enthalpy Deviation Lines
  • 13. To find out Humid Volume Move along humid volume lines and interpolate if necessary
  • 14.
  • 15.
  • 17. To find out Humidity Ratio or Moisture Contents
  • 18. To find out Dew Point
  • 19. To find out Relative Humidity
  • 20. Enthalpy at saturation Follow the wet bulb line to Enthalpy Scale to get Enthalpy at Saturation
  • 21. Follow the Enthalpy Deviation Line to get actual enthalpy of the air
  • 24. Step 1. Locate the dry bulb temperature along the bottom axis and the associated vertical line for each temperature. This scale will be in degrees F or degrees C. Step 2. Locate the ‘humidity ratio’ along the right vertical axis. Humidity ratio units are grains of moisture per pound of dry air or grams of moisture per kilogram of dry air. The term ‘humidity ratio’ is sometimes used interchangeably with the term ‘mixing ratio’. Step 3. Locate the left most curved line. This is the saturation curve where the relative humidity is 100%. Other properties of the saturation curve include; dew point temperature = dry bulb temperature; wet bulb temperature = dry bulb temperature; partial pressure of water vapor = saturation vapor pressure. Step 4. Locate the interior curved lines. Each of the lines represents a certain level of relative humidity in percent.
  • 25. Step 5. On the right side of the chart, locate the vertical line labeled ‘Dew Point’. Dew point is expressed as a temperature. The dew point lines traverse the chart as horizontal lines. What this tells you is that dew point does not change as the dry bulb temperature varies. Step 6. On the other side of the vertical line where you located dew point is the scale for vapor pressure expressed in inches of mercury or millibars. Vapor pressure lines also traverse the chart as horizontal lines. Step 7. Look at the information on all sides of the chart that is on the most extreme edge. These scales represent enthalpy expressed in BTU per pound of dry air. If you take a ruler, you could match the scales diagonally across the chart. Step 8. Look closely and find a second set of diagonal lines representing web bulb temperature expressed as degrees F or degrees C. Although the wet bulb lines are close to the enthalpy lines, they are not actually parallel to each other.
  • 26. Tips and tricks for the psychrometric chart As long as you have any 2 parameters where the lines will cross each other, you can determine all other parameters. For example, let’s say you know the dry bulb temperature is 70 degrees F and the dew point is 50 degrees F. Take a ruler and draw a vertical line at the dry bulb temperature of 70 and draw a horizontal line where the dew point is 50. The point where two lines intersect is known as a ‘state point’. Plot the state point and you can also read the relative humidity, wet bulb, enthalpy, vapor pressure and humidity ratio. As another example, let’s say you know that the wet bulb temperature is 50 and the dry bulb temperature is 75. Plot the state point and read the rest of the parameters
  • 27. If you wanted to know the cooling effect of an evaporative cooler, plot the state point where the dry bulb temperature line and the wet bulb temperature line intersect. Or you could plot the point where the dry bulb temperature and the relative humidity intersect. Follow the wet bulb line all the way to the saturation curve. Then read the dry bulb temperature at that saturation point. The difference between the temperature at the original point and the final point is your effective cooling of the air.