If mass of air in a house is 278.6376kg. And the specific heat of air is 1.0kj/kgK. How much heat energy is needed to heat air by 10K?   Use Q=mc∆T

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If mass of air in a house is 278.6376kg. And the specific heat of air is 1.0kj/kgK. How much heat energy is needed to heat air by 10K?

 

Use Q=mc∆T

A heat pump is a heating system installed on some newer houses. It works by pumping heat from outside to
inside. The efficiency of the heat pump is given by
QH
where W is the work done by an electric motor. The maximum theoretical efficiency of a heat pump is
TH
NHP maz
TH – Tc
1. If the temperature outside is 44°F and the temperature inside is 65°F (these are the current temperatures
outside and inside my apartment as I write this problem) what is the maximum possible efficiency of a heat
pump. (Hint: You need to convert both temperatures to Kelvin first. Google can do this conversion for you.)
Transcribed Image Text:A heat pump is a heating system installed on some newer houses. It works by pumping heat from outside to inside. The efficiency of the heat pump is given by QH where W is the work done by an electric motor. The maximum theoretical efficiency of a heat pump is TH NHP maz TH – Tc 1. If the temperature outside is 44°F and the temperature inside is 65°F (these are the current temperatures outside and inside my apartment as I write this problem) what is the maximum possible efficiency of a heat pump. (Hint: You need to convert both temperatures to Kelvin first. Google can do this conversion for you.)
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