18-2 The heat pump and structure whose characteristics are shown in Fig. 18-6 are in a region where the design outdoor temperature is -15°C. The compressor of the heat pump uses two cylinders to carry the base load and brings a third into service when needed. The third cylinder has a capacity equal to either of the other cylinders. How much supplementary resistance heat must be available at an outdoor temperature of -15°C? Ans. 5.8 kW. Energy flow rate, kW 24 22 20 18 16 14 12 10 8 00 T New balance point -20 Balance point -10 Additional capacity Heat loss of structure 10 Outdoor-air temperature, "C Figure 18-6 Balance points of heating capacity and heating load. Heating capacity 20
18-2 The heat pump and structure whose characteristics are shown in Fig. 18-6 are in a region where the design outdoor temperature is -15°C. The compressor of the heat pump uses two cylinders to carry the base load and brings a third into service when needed. The third cylinder has a capacity equal to either of the other cylinders. How much supplementary resistance heat must be available at an outdoor temperature of -15°C? Ans. 5.8 kW. Energy flow rate, kW 24 22 20 18 16 14 12 10 8 00 T New balance point -20 Balance point -10 Additional capacity Heat loss of structure 10 Outdoor-air temperature, "C Figure 18-6 Balance points of heating capacity and heating load. Heating capacity 20
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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Heat Pumps
Transcribed Image Text:18-2 The heat pump and structure whose characteristics are shown in Fig. 18-6 are
in a region where the design outdoor temperature is -15°C. The compressor of the
heat pump uses two cylinders to carry the base load and brings a third into service
when needed. The third cylinder has a capacity equal to either of the other cylinders.
How much supplementary resistance heat must be available at an outdoor temperature
of -15°C? Ans. 5.8 kW.
Energy flow rate, kW
24
22
20
18
16
14
N
10
00
6
4
2
0
1
-20
New balance
point
Balance
point
Additional
capacity
-10
Heat loss of structure
10
Outdoor-air temperature, C
Figure 18-6 Balance points of heating capacity and heating load.
Heating capacity
T
T
20
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