Refrigeration & Air Conditioning Mechanic Red Seal · Question
A residential client in Calgary reports that their furnace struggles to maintain a comfortable temperature during winter. The heat loss calculation reveals a design condition heat loss of 28,000 BTU/hr at -30°C outdoor temperature. What is the minimum furnace output capacity (in kW) required, assuming a safety factor of 15% and taking into account typical furnace efficiency of 92%?
First, convert BTU/hr to kW: 28,000 BTU/hr ÷ 3412.14 BTU/hr/kW ≈ 8.206 kW. Apply the safety factor: 8.206 kW × 1.15 ≈ 9.437 kW. Now, account for furnace efficie
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Question: A residential client in Calgary reports that their furnace struggles to maintain a comfortable temperature during winter. The heat loss calculation reveals a design condition heat loss of 28,000 BTU/hr at -30°C outdoor temperature. What is the minimum furnace output capacity (in kW) required, assuming a safety factor of 15% and taking into account typical furnace efficiency of 92%?
Answer options: ✅ 11.8 kW
- 10.2 kW
- 9.3 kW
- 13.5 kW
Correct answer: 11.8 kW
Explanation: First, convert BTU/hr to kW: 28,000 BTU/hr ÷ 3412.14 BTU/hr/kW ≈ 8.206 kW. Apply the safety factor: 8.206 kW × 1.15 ≈ 9.437 kW. Now, account for furnace efficiency: Required Output = 9.437 kW / 0.92 ≈ 10.25 kW. This is the required input to the furnace to realize the desired heat output.
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