Question

Problem #3: By supplying energy at a rate of 20,250 kJ/h, a heat pump is able to maintain the temperature of a dwelling at 20 °C. The heat pump receives energy by heat transfer from the outdoor air at -5 °C. Assume that electricity costs $0.10/kWh. (a) Determine the minimum theoretical operating cost for each day of operation. (b) What is the actual coefficient of performance for the heat pump if the utility bills indicate that the actual cost is 32% higher than the minimum theoretical cost?

          Problem #3: By supplying energy at a rate of 20,250 kJ/h, a heat pump is able to maintain the
temperature of a dwelling at 20 °C. The heat pump receives energy by heat transfer from the
outdoor air at -5 °C. Assume that electricity costs $0.10/kWh.
(a) Determine the minimum theoretical operating cost for each day of operation.
(b) What is the actual coefficient of performance for the heat pump if the utility bills indicate
that the actual cost is 32% higher than the minimum theoretical cost?

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Problem #3: By supplying energy at a rate of 20,250 kJ/h, a heat pump is able to maintain the
temperature of a dwelling at 20 °C. The heat pump receives energy by heat transfer from the
outdoor air at -5 °C. Assume that electricity costs 0.10/kWh.
(a) Determine the minimum theoretical operating cost for each day of operation.
(b) What is the actual coefficient of performance for the heat pump if the utility bills indicate
that the actual cost is 32% higher than the minimum theoretical cost?

Added by Alexander H.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Christopher Dzorkpata

Step 1

First, let's convert the energy supply rate from kJ/h to kWh/day: 20,250 kJ/h * (1 kWh / 3,600 kJ) * 24 h/day = 135 kWh/day Show more…

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Problem #3: By supplying energy at a rate of 20,250 kJ/h, a heat pump is able to maintain the temperature of a dwelling at 20Â°C. The heat pump receives energy by heat transfer from the outdoor air at -5Â°C. Assume that electricity costs $0.10/kWh. a) Determine the minimum theoretical operating cost for each day of operation. b) What is the actual coefficient of performance for the heat pump if the utility bills indicate that the actual cost is 32% higher than the minimum theoretical cost?

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