Question 1 of 2707066636eee28f7522a1c51ecd6

Which of the listed statements describes the method used to determine the amount of superheat present in the suction gas leaving the evaporator coil? Illustration GS-RA-16

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Question 1 of 27070
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Q

Which of the listed statements describes the method used to determine the amount of superheat present in the suction gas leaving the evaporator coil? Illustration GS-RA-16

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šŸ” Key Concepts

ā€¢ Superheat is the difference between the actual vapor temperature and the saturation temperature at the same pressure. ā€¢ On a refrigeration system, the low-side gauge lets you determine the refrigerantā€™s saturation temperature from the measured suction pressure. ā€¢ The sensing bulb of a thermostatic expansion valve is normally placed on the suction line leaving the evaporator, where you want to control superheat.

šŸ’­ Think About

ā€¢ Ask yourself: to get superheat, do you add or subtract the saturation temperature from the measured line temperature? Which one should be higher in a properly operating evaporator outlet line? ā€¢ Which locationā€™s temperature will best represent the suction gas leaving the evaporator coilā€”right at the thermostatic expansion valve sensing bulb or further downstream at the compressor inlet? ā€¢ Look at the gauge illustration: how do you use that pressure reading and the inner temperature scale together to find the saturation temperature before comparing it with the thermometer reading?

āœ… Before You Answer

ā€¢ You must be comparing temperature and saturation temperature at the SAME location in the system. ā€¢ The math must follow the definition: Superheat = Actual vapor temperature āˆ’ Saturation temperature at that pressure. ā€¢ The statement you choose should explicitly relate to the suction gas leaving the evaporator, not somewhere else in the suction line.