moving heat: heating and air conditioning principles

moving heat: heating and air conditioning principles PowerPoint PPT Presentation


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2. Principles of Heat. Heat always moves toward coldTo warm something, heat must be addedTo cool something, heat must be removedA large amount of heat is absorbed when liquid changes state to a vaporA large amount of heat is released when a vapor changes state to a liquidCompressing a gas concentrates the heat and increases the temperature.

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moving heat: heating and air conditioning principles

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1. 1 Moving Heat: Heating and Air Conditioning Principles Basic principles of heat Heating load Cooling load Basic principles of mechanical refrigeration

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3. 3 Heating load Term used to describe need for added heat Measured in BTU’s of heat energy that must be added Vehicle heat is provided by engine’s cooling system

4. 4 Cooling load Term used to describe heat that must be removed Heat must be removed to a cooler location in order to handle a cooling load

5. 5 Basic principles of mechanical refrigeration Refrigerant is boiled to change from liquid to gas When liquid refrigerant boils, it absorbs a large amount of heat (latent heat of evaporation) Gas is then recycled into liquid to repeat process

6. 6 Basic principles of mechanical refrigeration Gas is used to absorb and move heat from passenger compartment to the front of engine compartment Air flowing over the condenser, removes the heat from gas and causes refrigerant to condense into a liquid Liquid is sent back to evaporator to boil again and absorb more heat

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8. 8 Compression heating When gas is compressed, the temperature of the gas is increased Raising the pressure of the refrigerant brings the temperature to a point above the ambient temperature Raising the temperature of the refrigerant allows the required heat transfer from the refrigerant to the ambient air

9. 9 Compression heating Purpose of condenser: Removal of all heat absorbed in evaporator Gas is recycled into a liquid to repeat process

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