- AHeat that causes a phase change
- Heat that can be measured as a temperature change
- CHeat stored in refrigerant oil
- DHeat that cannot be detected
Correct answer
Heat that can be measured as a temperature change
Why
Sensible heat is heat that causes a measurable change in temperature without a phase change occurring.
The concept behind this question
The refrigeration cycle moves heat rather than creating cold, and every question about pressures and temperatures comes back to it. The compressor raises the refrigerant's pressure and temperature; the condenser rejects heat and the refrigerant becomes liquid; the metering device drops the pressure; the evaporator absorbs heat from the space and the refrigerant boils back to vapour. Because pressure and temperature are related for a saturated refrigerant, a pressure reading plus a P/T chart tells you the saturation temperature — which is the basis for measuring superheat and subcooling.
More questions on this topic
- Which component separates the high-pressure and low-pressure sides of a refrigeration system?
- What is the function of the compressor in a refrigeration system?
- What is the function of the evaporator in a refrigeration system?
- What is the function of the condenser in a refrigeration system?
- What is the 'superheat' in a refrigeration system?
- What is 'subcooling' in a refrigeration system?
Exam-style practice question. Not an official EPA exam question.