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PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART INTRODUCTION:  PSYCHOMETRICS IS THE STUDY OF MOIST AIR.  THE PSYCHOMETRIC CHART IS A GRAPHIC REPRESENTATION.

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Presentation on theme: "PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART INTRODUCTION:  PSYCHOMETRICS IS THE STUDY OF MOIST AIR.  THE PSYCHOMETRIC CHART IS A GRAPHIC REPRESENTATION."— Presentation transcript:

1 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART INTRODUCTION:  PSYCHOMETRICS IS THE STUDY OF MOIST AIR.  THE PSYCHOMETRIC CHART IS A GRAPHIC REPRESENTATION OF THE THERMODYNAMICS AND THERMAL PROPERTIES OF MOIST AIR.  THE LATENT HEAT IN WATER VAPOR IS THE LARGEST OF ANY COMMON LIQUID.  AS A RESULT, THE SMALL AMOUNT OF WATER VAPOR IN THE AIR MIXTURE OFTEN CONTAINS THE MAJOR PART OF THE TOTAL ENERGY OF THE MIXTURE.

2 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART

3 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART

4 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART WET-BULB TEMPERATURE:  THE TEMPERATURE REGISTERED BY A THERMOMETER WHOSE BULB IS COVERED BY A WETTED WICK AND EXPOSED TO A CURRENT OF RAPIDLY MOVING AIR.

5 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART WET-BULB TEMPERATURE

6 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART DEW POINT TEMPERATURE:  THE TEMPERATURE AT WHICH CONDENSATION OF MOISTURE BEGINS WHEN AIR IS COOLED.

7 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART DEW POINT TEMPERATURE

8 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART HUMIDITY RATIO:  THE AMOUNT OF WATER IN THE AIR AND IS MEASURED IN GRAINS (7000 GRAINS = ONE POUND) OR POUNDS PER POUND OF DRY AIR.  ALSO KNOW AS ABSOLUTE HUMIDITY.

9 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART HUMIDITY RATIO

10 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART RELATIVE HUMIDITY:  THE RATIO OF THE ACTUAL WATER CONTENT TO THE MAXIMUM POSSIBLE MOISTURE CONTENT AT A GIVEN TEMPERATURE.  RELATIVE HUMIDITY IS EXPRESSED AS A PERCENTAGE.

11 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART RELATIVE HUMIDITY

12 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART SENSIBLE HEAT:  HEAT ASSOCIATED WITH CHANGE IN DRY-BULB TEMPERATURE.

13 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART LATENT HEAT:  HEAT ASSOCIATED WITH THE CHANGE OF STATE OF THE MOISTURE IN AIR.  LATENT HEAT OF VAPORIZATION IS APPROXIMATELY 1000 BTU/LB OF WATER.  WHEN MOISTURE IS CONDENSED FROM AIR, THE AIR IS REDUCING ITS LATENT HEAT.  WHEN MOISTURE IS EVAPORATED INTO THE AIR, THE AIR IS INCREASING ITS LATENT HEAT.

14 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART LATENT HEAT

15 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART ENTHALPY ENTHALPY:  A THERMAL PROPERTY INDICATING THE QUANTITY OF HEAT IN THE AIR EXPRESSED IN BTU/LB OF DRY AIR.  ENTHALPY REPRESENTS THE SUM OF THE LATENT AND SENSIBLE HEAT OF AIR.

16 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART ENTHALPY

17 PSYCHOMETRICS INTRODUCTION INDEXES  DRY-BULB  WET-BULB  DEW POINT  HUMIDITY RATIO  RELATIVE HUMIDITY  SENSIBLE HEAT  LATENT HEAT  ENTHALPY  SPECIFIC VOLUME PSYCHOMETRIC CHART SPECIFIC VOLUME:  SPECIFIC VOLUME IS THE RECIPROCAL OF DENSITY OR THE VOLUME/WEIGHT.  THESE LINES SHOW HOW THE DENSITY OF AIR VARIES AS ITS TEMPERATURE AND MOISTURE CONTENT VARIES.  SPECIFIC VOLUME IS A USEFUL QUANTITY IN AIR CONDITIONING CALCULATIONS.

18 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES HEATING & COOLING

19 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES HEATING

20 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES COOLING

21 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES DEHUMIDIFICATION BY COOLING

22 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES DEHUMIDIFICATION BY ABSORPTION

23 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES HUMIDIFICATION WITH STEAM

24 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES DETERMINING DEW POINT & WET-BULB TEMPERATURE

25 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES EVAPORATIVE COOLING

26 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES COMFORT ZONE

27 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES PASSIVE COOLING

28 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES PASSIVE COOLING

29 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES PASSIVE COOLING......

30 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES PASSIVE & ACTIVE HEATING

31 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES PASSIVE COOLING

32 PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART  HEATING & COOLING  HUMIDITY  DEW POINT TEMPERATURE  WET-BULB TEMPERATURE  EVAPORATIVE COOLING  OTHER USES PSYCHOMETRIC CHART SUMMARY


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