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# AIR CONDITIONING #2

### ABC'S OF AIRCONDITIONING

TermDefinition
WHAT IS AIR CONDITIONING? 1) The process of treating the air, so as to control Simultaneously, its temperature, humidity, cleanliness,and distribution to meet the requirements of the conditioned space.
WHAT ARE 4 CONDITIONS THAT DIRECTLY AFFECT THE BODY'S COMFORT IN THE CONDITIONED SPACE? a) Temperature b) Relative Humidity c) Air Cleanliness d) Air Distribution or Circulation
THE THREE WAYS THAT THE BODY REJECTS HEAT ARE? 1) Convection- Through air flow. 2) Radiation- Through the use of waveform energy. 3) Evaporation- Through normal perspiration and sweat. Normally the body gives off heat by all three ways at the same time.
WHAT IS RELATIVE HUMIDITY? 1) A comparison of the actual moisture in the air, to the amount of moisture that the air can hold @ any given temperature. 2) It is expressed as a percentage. 3) The higher the RH= less comfortable. The lower the RH= more comfortable it feels.
WHAT ARE THE 2 TYPES OF LOADS? 1) Cooling Load: Condition where the Conditioned Space has too much heat. 2) Heating Load: Condition where the Conditioned Space has too little heat.
WHAT IS PRESSURE 1) Pressure is measured in force/unit area....lbs/in^2...PSI 2) Pressures above 14.7 psi is measured in psi Pressures below 14.7 psi is measured in (in.HG)(mercury), or inches of vacuum. (in.Vac) 3) Pressure determines the boiling point of a liquid.
WHAT IS A PERFECT VACUUM? 30 in.Vac is a perfect vacuum.
WHAT DIRECTION IS THE FORCE OF SOLIDS Downward
WHAT DIRECTION IS THE FORCE OF LIQUIDS? Downward and Sidewards
WHAT DIRECTION IS THE FORCE OF VAPORS OR GAS? Exerts pressure in all directions
HOW DO YOU CONVERT GAUGE PRESSURES (PSIG) TO ABSOLUTE PRESSURES (PSIA)? Must add 14.7 psi to the gauge pressure.
WHAT ARE TWO CLASSIFICATIONS OF AN AIR DISTRIBUTION SYSTEM? 1) RETURN AIR: CONDITIONED SPACE TO AIR CONDITIONING UNIT 2) SUPPLY AIR: TREATED AIR GOING TO CONDITIONED SPACE; DESIGNED TO RETURN AT 60° .
WHAT IS DEW POINT TEMPERATURE? THE TEMPERATURE AT WHICH WATER VAPOR (MOISTURE) CONDENSES AND SEPARATES FROM THE AIR.
WHAT ARE THE TWO OPERATING PRINCIPLES OF A REFRIGERATION SYSTEM? 1) A LIQUID ABSORBS A LARGE QUANTITY OF HEAT (IN BTUS) WHEN IT EVAPORATES INTO A VAPOR. 2) A VAPOR GIVES UP (LOSES) A LARGE QUANTITY OF HEAT (IN BTUS) WHEN IT CONDENSES INTO A LIQUID.
WHAT ARE 4 BASIC COMPONENTS OF AN AIR CONDITIONER? 1) COMPRESSOR 2) CONDENSER 3) METERING DEVICE 4) EVAPORATOR
WHAT DOES THE COMPRESSOR DO? A DEVICE THAT CHANGES A LOW PRESSURE AND COLD TEMPERATURE VAPOR INTO A HIGHER PRESSURE AND HIGH TEMPERATURE VAPOR. THE RISE IS DUE TO THE HEAT OF THE COMPRESSOR PROCESS TURNS COLD VAPOR TO HOT GAS
WHAT DOES THE CONDENSER DO? A DEVICE USED TO REJECT HEAT FROM THE REFRIGERATION SYSTEM
WHAT DOES A METERING DEVICE DO? 1) USED TO CONTROL THE FLOW OF REFRIGERANT TO THE EVAPORATOR. 2) IT HAS A SMALL ORIFICE, THROUGH WHICH LIQUID IS FORCED, CAUSING THE REFRIGERANT TO FLASH, AND DROPS THE PRESSURE AND TEMPERATURE. 3) CHANGES A HOT LIQUID TO A COLD LIQUID / VAPOR MIX
WHAT DOES THE EVAPORATOR DO? A DEVICE USED TO ABSORB HEAT INTO THE REFRIGERATION SYSTEM. IT IS DESIGNED TO LOWER THE AIR TEMPERATURE AND MOISTURE FROM THE AIR
Created by: michafnl

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