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PSYCHOMETRICS INTRODUCTION INTRODUCTION: INDEXES PSYCHOMETRICS IS THE STUDY OF MOIST AIR. PSYCHOMETRIC CHART 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. PSYCHOMETRIC CHART PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART PSYCHOMETRIC CHART PSYCHOMETRICS INTRODUCTION INDEXES DRY-BULB WET-BULB DEW POINT HUMIDITY RATIO RELATIVE HUMIDITY SENSIBLE HEAT LATENT HEAT ENTHALPY SPECIFIC VOLUME PSYCHOMETRIC CHART PSYCHOMETRIC CHART 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. 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 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. 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 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. PSYCHOMETRICS INTRODUCTION INDEXES DRY-BULB WET-BULB DEW POINT HUMIDITY RATIO RELATIVE HUMIDITY SENSIBLE HEAT LATENT HEAT ENTHALPY SPECIFIC VOLUME PSYCHOMETRIC CHART HUMIDITY RATIO 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. PSYCHOMETRICS INTRODUCTION INDEXES DRY-BULB WET-BULB DEW POINT HUMIDITY RATIO RELATIVE HUMIDITY SENSIBLE HEAT LATENT HEAT ENTHALPY SPECIFIC VOLUME PSYCHOMETRIC CHART RELATIVE HUMIDITY 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. 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. PSYCHOMETRICS INTRODUCTION INDEXES DRY-BULB WET-BULB DEW POINT HUMIDITY RATIO RELATIVE HUMIDITY SENSIBLE HEAT LATENT HEAT ENTHALPY SPECIFIC VOLUME PSYCHOMETRIC CHART LATENT HEAT PSYCHOMETRICS INTRODUCTION INDEXES DRY-BULB WET-BULB DEW POINT HUMIDITY RATIO RELATIVE HUMIDITY SENSIBLE HEAT LATENT HEAT 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. SPECIFIC VOLUME PSYCHOMETRIC CHART ENTHALPY PSYCHOMETRICS INTRODUCTION INDEXES DRY-BULB WET-BULB DEW POINT HUMIDITY RATIO RELATIVE HUMIDITY SENSIBLE HEAT LATENT HEAT ENTHALPY SPECIFIC VOLUME PSYCHOMETRIC CHART ENTHALPY PSYCHOMETRICS INTRODUCTION SPECIFIC VOLUME: INDEXES DRY-BULB WET-BULB SPECIFIC VOLUME IS THE RECIPROCAL OF DENSITY OR THE VOLUME/WEIGHT. DEW POINT HUMIDITY RATIO RELATIVE HUMIDITY THESE LINES SHOW HOW THE DENSITY OF AIR VARIES AS ITS TEMPERATURE AND MOISTURE CONTENT VARIES. SENSIBLE HEAT LATENT HEAT ENTHALPY SPECIFIC VOLUME PSYCHOMETRIC CHART SPECIFIC VOLUME IS A USEFUL QUANTITY IN AIR CONDITIONING CALCULATIONS . PSYCHOMETRIC CHART PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES HEATING & COOLING PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES HEATING PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES COOLING PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES DEHUMIDIFICATION BY COOLING PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES DEHUMIDIFICATION BY ABSORPTION PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES HUMIDIFICATION WITH STEAM PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES DETERMINING DEW POINT & WET-BULB TEMPERATURE PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES EVAPORATIVE COOLING PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES COMFORT ZONE PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE . . WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES . . . . . . . . . PASSIVE COOLING . PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING . HUMIDITY . DEW POINT TEMPERATURE WET-BULB TEMPERATURE . . . . . EVAPORATIVE COOLING OTHER USES . . . PASSIVE COOLING PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES . . . . . . . . . . PASSIVE COOLING . PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE . EVAPORATIVE COOLING . OTHER USES . . . .. . . . . . ... PASSIVE & ACTIVE HEATING PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING . . . . . . . . . OTHER USES . . . . . PASSIVE COOLING . . . PSYCHOMETRICS INTRODUCTION INDEXES PSYCHOMETRIC CHART HEATING & COOLING HUMIDITY DEW POINT TEMPERATURE WET-BULB TEMPERATURE EVAPORATIVE COOLING OTHER USES PSYCHOMETRIC CHART SUMMARY