The greatest amount of heat that is given up from the refrigerant is while the condensing process is taking place, de superheating
5.After heat is absorbed into a condenser medium in a water cooled condenser,the heat can be deposited in one of two places.What are they?
Answer : The water can be used once, then wasted down the drain or where large amounts of water are being used, it is more economical to save water, cool it in an outside water tower and reuse it.
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7.When a standard efficiency air cooled condenser is used the condensing refrigerant will normally be....F higher in temperature than the entering air temp .
Answer : High efficiency would be to have the condenser head pressure as close to the ambient air as possible.
Answer : The discharge gas can be passed to the rooftop condenser or to a coil mounted in the duct work that supplies heat to the store.
14.Briefly describe what is meant by floating head pressure and tell why it is used in refrigeration and AC system
Answer : An industry term for attaining the lowest possible condensing pressure is called Floating head pressure. Floating head pressure systems simply let the condensing pressure follow the ambient temperature as the seasons swing from summer to winter.
15.Explain how to flush impurities from a water regulating valve that is on a water cooled condenser.
16.Explain the basic operations of a combination ORI and ORD low ambient head pressure control valve.
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Answer : ORD valve sense a factory preset pressure difference of 20 psi between the receiver and compressor disfee , It will start to open and bypass hot compressor discharge gas to the receivers inlet The ORI valve stows refrigerant in the condenser to maintain the correct head pressure. Both the ORI and the ORD will work in conjunction of one another to maintain proper receiver pressure, regardless of outside temperature.
17.Name two problems a refrigeration system may have if the condensing unit is exposed to low ambient condition when it is not using a low ambient head pressure control valve
Answer : When the condensing medium is cold enough to reduce the head pressure to the point that the expansion device will starve the evaporator. And less head pressure cause less heat to be available for the heat reclaim coils to heat buildings
20.What must be added to the system to help water when it is evaporating from over concentrating minerals ?