一台内燃机的输出功率是2.94kW,热机效率是25%.若汽油能够完全燃烧,则这台内燃机每小时消耗多少汽油?损失多少热能?(汽油的热值为4.6×107J/kg)
2023-04-27
问题描述:
一台内燃机的输出功率是2.94kW,热机效率是25%.若汽油能够完全燃烧,则这台内燃机每小时消耗多少汽油?损失多少热能?(汽油的热值为4.6×107J/kg)最佳答案:
由P=
W |
t |
W有用=Pt=2.94kW×1h=2.94kW•h=1.0584×107J;
由η=
W |
Q放 |
Q放=
W |
η |
1.0584×107J |
25% |
由Q放=mq得,
m汽油=
Q放 |
q |
4.2336×107J |
4.6×107J/kg |
损失的热能:W损=Q放-W有用=4.2336×107J-1.0584×107J=3.1752×107J.
答:这台内燃机每小时消耗0.92kg的汽油;损失的热能为3.1752×107J.
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