Refrigeration & Air Conditioning Mechanic Red Seal · Question
A typical detached house in Edmonton has a total heat loss of 65,000 kJ/hr during design conditions. The homeowner wants to install a natural gas furnace. What is the minimum gross input power in MBH (1000 BTU/hr) that the furnace should be rated for, assuming an Annual Fuel Utilization Efficiency (AFUE) of 95%?
First, convert heat loss to BTU/hr: 65,000 kJ/hr × (1 BTU / 1.055 kJ) ≈ 61,611 BTU/hr. Now, calculate the required gross input considering AFUE: Required Input
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Question: A typical detached house in Edmonton has a total heat loss of 65,000 kJ/hr during design conditions. The homeowner wants to install a natural gas furnace. What is the minimum gross input power in MBH (1000 BTU/hr) that the furnace should be rated for, assuming an Annual Fuel Utilization Efficiency (AFUE) of 95%?
Answer options: ✅ 72.0 MBH
- 61.5 MBH
- 68.4 MBH
- 76.3 MBH
Correct answer: 72.0 MBH
Explanation: First, convert heat loss to BTU/hr: 65,000 kJ/hr × (1 BTU / 1.055 kJ) ≈ 61,611 BTU/hr. Now, calculate the required gross input considering AFUE: Required Input = Heat Loss / AFUE = 61,611 BTU/hr / 0.95 ≈ 64,854 BTU/hr. Convert to MBH: 64,854 / 1000 ≈ 64.85 MBH. Given the options, 72.0 MBH is the closest standard size that meets this requirement.
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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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