Flash gas formed in the liquid line of a...

Question 1 / 270705eccef9dbacbc34ba4d45fa2

Question 1 of 270705eccef9dbacbc34ba4d45fa2

Flash gas formed in the liquid line of a direct reciprocating air conditioning system may cause what condition?

Question 1 of 27070

Flash gas formed in the liquid line of a direct reciprocating air conditioning system may cause what condition?

🔍 Key Concepts

• Flash gas formation in a liquid refrigerant line • How expansion valves are designed to work with subcooled liquid refrigerant • Effect of vapor bubbles on flow, pressure, and erosion in valves

💭 Think About

• Think about what should normally be entering the expansion valve in a properly designed system: is it all liquid, all vapor, or a mix? • If vapor bubbles are present in the liquid line, how does that affect the actual mass of liquid reaching the valve and the way the valve meters flow? • Would the presence of flash gas tend to increase or decrease the effective pressure drop and flow of liquid through the valve?

✅ Before You Answer

• Confirm what flash gas is: liquid refrigerant that has boiled off into vapor before the expansion valve • Consider whether vapor in the liquid line would cause erosion of metal parts, or is erosion more associated with high velocity liquid/solid impacts and cavitation? • Carefully compare each choice against what happens to pressure at the valve inlet, actual liquid flow, and valve metering capacity when some of the liquid has already turned to vapor.

Question 1 of 27070

Flash gas formed in the liquid line of a direct reciprocating air conditioning system may cause what condition?

pressure at expansion valve inlet to increase

expansion valve pins and seats to erode

expansion valve capacity to increase

pressure difference across the expansion valve to increase

Question 1 / 270705eccef9dbacbc34ba4d45fa2

Question 1 of 270705eccef9dbacbc34ba4d45fa2

Flash gas formed in the liquid line of a direct reciprocating air conditioning system may cause what condition?

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Question 1 of 27070

Flash gas formed in the liquid line of a direct reciprocating air conditioning system may cause what condition?