What is the rule of thumb for BTU per hour of heat rejection for a condenser?

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Multiple Choice

What is the rule of thumb for BTU per hour of heat rejection for a condenser?

Explanation:
Heat rejected by a condenser isn’t just the cooling load handled by the evaporator; it also has to carry the heat produced by the compressor. A handy rule of thumb is that the condenser rejects about 1.25 times the evaporator’s capacity. For a typical 1-ton system (12,000 BTU/h) this comes out to roughly 15,000 BTU/h. That’s why 15,000 is the best estimate. Choosing 10,000 or 12,000 would ignore the extra heat from the compressor, while 18,000 is a larger multiplier than the common rule of thumb.

Heat rejected by a condenser isn’t just the cooling load handled by the evaporator; it also has to carry the heat produced by the compressor. A handy rule of thumb is that the condenser rejects about 1.25 times the evaporator’s capacity. For a typical 1-ton system (12,000 BTU/h) this comes out to roughly 15,000 BTU/h. That’s why 15,000 is the best estimate.

Choosing 10,000 or 12,000 would ignore the extra heat from the compressor, while 18,000 is a larger multiplier than the common rule of thumb.

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