Rate of evaporator heat transfer, kW 20 18 16 14 12 -20°C -10°C -10 Compressor oc 18-3 The air-source heat pump referred to in Figs. 18-4 and 18-5 operates 2500 h during the heating season, in which the average outdoor temperature is 5°C. The efficiency of the compressor motor is 80 percent, the motor for the outdoor air fan draws 0.7 kW, and the cost of electricity is 6 cents per kilowatthour. What is the heating cost for the season? Ans. $724 0 10°C 10 Evaporating temperature, "C Outdoor-air temperature, 20°C 20 Figure 18-4 Evaporator heat-transfer rates of a heat pump with varying outdoor temperature. condensing temperature is constant at 40°C. Energy flow rate, kW 24 22 20 18 16 14 12 10 8 00 6 4 2 0 I -20 Heating capacity -10 Evaporator heat-transfer rate Compressor power 10 Outdoor-air temperature, °C 20 b Figure 18-5 Heating capacity, evaporator heat-transfer rate, and compressor power of an air-source heat pump as a function of outdoor-air temperature.
Rate of evaporator heat transfer, kW 20 18 16 14 12 -20°C -10°C -10 Compressor oc 18-3 The air-source heat pump referred to in Figs. 18-4 and 18-5 operates 2500 h during the heating season, in which the average outdoor temperature is 5°C. The efficiency of the compressor motor is 80 percent, the motor for the outdoor air fan draws 0.7 kW, and the cost of electricity is 6 cents per kilowatthour. What is the heating cost for the season? Ans. $724 0 10°C 10 Evaporating temperature, "C Outdoor-air temperature, 20°C 20 Figure 18-4 Evaporator heat-transfer rates of a heat pump with varying outdoor temperature. condensing temperature is constant at 40°C. Energy flow rate, kW 24 22 20 18 16 14 12 10 8 00 6 4 2 0 I -20 Heating capacity -10 Evaporator heat-transfer rate Compressor power 10 Outdoor-air temperature, °C 20 b Figure 18-5 Heating capacity, evaporator heat-transfer rate, and compressor power of an air-source heat pump as a function of outdoor-air temperature.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
Heat Pumps
Transcribed Image Text:Rate of evaporator heat transfer, kW
20
18
16
14
12
-20°C
-10°C
-10
Compressor
oc
18-3 The air-source heat pump referred to in Figs. 18-4 and 18-5 operates 2500 h
during the heating season, in which the average outdoor temperature is 5°C. The
efficiency of the compressor motor is 80 percent, the motor for the outdoor air fan
draws 0.7 kW, and the cost of electricity is 6 cents per kilowatthour. What is the
heating cost for the season? Ans. $724
0
10°C
10
Evaporating temperature, "C
Outdoor-air temperature, 20°C
20
Figure 18-4 Evaporator heat-transfer rates of a heat pump with varying outdoor temperature.
condensing temperature is constant at 40°C.
Energy flow rate, kW
24
22
20
18
16
14
12
10
8
00
6
4
2
0
I
-20
Heating capacity
-10
Evaporator heat-transfer rate
Compressor power
10
Outdoor-air temperature, °C
20
b
Figure 18-5 Heating capacity, evaporator heat-transfer rate, and compressor power of an air-source
heat pump as a function of outdoor-air temperature.
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