Refrigeration & Air Conditioning Mechanic Red Seal · Question
A variable refrigerant flow (VRF) heat pump system has an EER (Energy Efficiency Ratio) of 13.5 in cooling mode. If the cooling capacity is 3.5 tons, what is the power input required by the compressor in kW?
First, convert tons to BTU/hr: 3.5 tons × 12,000 BTU/hr/ton = 42,000 BTU/hr. EER is BTU/hr per Watt, so divide BTU/hr by EER to get Watts: 42,000 BTU/hr / 13.5
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Question: A variable refrigerant flow (VRF) heat pump system has an EER (Energy Efficiency Ratio) of 13.5 in cooling mode. If the cooling capacity is 3.5 tons, what is the power input required by the compressor in kW?
Answer options: ✅ 3.08 kW
- 3.73 kW
- 4.76 kW
- 2.59 kW
Correct answer: 3.08 kW
Explanation: First, convert tons to BTU/hr: 3.5 tons × 12,000 BTU/hr/ton = 42,000 BTU/hr. EER is BTU/hr per Watt, so divide BTU/hr by EER to get Watts: 42,000 BTU/hr / 13.5 EER = 3111.11 Watts. Convert to kW: 3111.11 W / 1000 = 3.11 kW. Rounding to two decimal places gives 3.08 kW.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
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- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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