Draw a sketch of the following situations identifying the system or control volume, and the boundary of the system or the contro
1 answer:
Answer:
Attached below
Explanation:
a) combustion gases in a cylinder during the power stroke is A closed system
b) Combustion gases in a cylinder during the exhaust stroke is an Open system
c) A balloon exhausting air is an Open system
d) It is a system
e) This is a control volume
Attached below is the sketch of the following situations
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Answer:
a) Ql=33120000 kJ
b) COP = 5.6
c) COPreversible= 29.3
Explanation:
a) of the attached figure we have:
HP is heat pump, W is the work supplied, Th is the higher temperature, Tl is the low temperature, Ql is heat supplied and Qh is the heat rejected. The worj is:
W=Qh-Ql
Ql=Qh-W
where W=2000 kWh
Qh=120000 kJ/h
b) The coefficient of performance is:
c) The coefficient of performance of a reversible heat pump is:
Th=20+273=293 K
Tl=10+273=283K
Replacing:
