Unit 16.docx - 1 What is the purpose of the evaporator in...

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1. What is the purpose of the evaporator in the refrigeration system? Device used for absorbing heat into the refrigeration system. 2. Why does the heat flow into the evaporator? The temperature of the refrigerant is lower than the temperature of the product being cooled. 3. What is the difference between sensible and latent cooling? Sensible is the amount of temperature change in the air as it passes through the coil and the temperature change can be measured by a thermometer. Water vapor will condense to a liquid as it passes over the evaporator if the evaporator temperature is below the dew point. 4. Explain how an evaporator can dehumidify the air Removes water from the air because 970 btu’s has to be removed when water vapor condenses on the evaporator the cooling capacity that is used to condense water vapor out of the air does not change the air temperature. 5. Define product as it relates to refrigeration. Refer to anything that is being cooled or frozen 6. List four broad types of evaporator application Domestic refrigeration, commercial refrigeration, air conditioning, chillers 7. List the types of water cooling evaporator construction Bare pipe evaporators, plate evaporators tube and fin coil evaporators 8. Where are plate-type evaporator used? Refrigeration and freezer applications 9. Why are fins added Why are fins added to the copper tubing on tube and fin coils?
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