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The summative assessment for this unit is an essay in which you will explain how

by | Jun 4, 2022 | Chemistry

 

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The summative assessment for this unit is an essay in which you will explain how the
ideas we have studied so far this unit apply to air source heat pumps. Heat Pumps have the
potential to facilitate a shift from using carbon emitting fuels such as oil and natural gas for
heating to using renewable sources of electricity. Heat Pumps deliver up to four times the
electrical energy they use to operate as heat energy. They do this by moving heat from outdoors
As you explain how heat pumps work, you need to incorporate answers to the guiding questions
into your essay. The essay must be written in complete sentences and may not consist of bullet-point answers to the questions. Links to sources on heat pumps are provided at the bottom of the
page..
• What are the four major working parts of a heat pump?
• What are some common chemicals that are used for refrigerants?
• What properties do materials used for refrigerants have?
• Where does the gas decrease its volume?
• Discuss how the combined gas law explains the relationship between temperature and
pressure when the gas is compressed.
• Discuss how the combined gas law explains the relationship between volume and
pressure when the gas is compressed.
• Where does a change of phase from gas to liquid occur?
• Where is heat transferred from and where is it transferred to during condensation?
• Explain how evaporative cooling works and where it occurs in the cycle.
• Where does a gas increase its volume?
• Discuss how the combined gas law explains the relationship between pressure and
volume when the gas expands.
• Discuss how the combined gas law explains the relationship between pressure and
temperature when the gas expands.
• Where does a change of phase from liquid to gas occur? (This happens twice)
• Where is heat transferred from and where is it transferred to during evaporation?
• What are the two places where energy enters the heat pump?
• Where does energy exit the heat pump?

 

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