Any noncondensable gases in a TXV controlled refrigeration system will eventually accumulate in the top of the system condenser. What condition does this cause?
• Behavior of noncondensable gases in a condenser • Effect on heat transfer and condensing temperature/pressure • Relationship between condenser pressure and the rest of the system pressures
• Think about what happens to the refrigerant’s ability to reject heat when noncondensables collect at the top of the condenser. • If the condenser has to operate at a higher temperature to get rid of heat, what happens to the pressure on that side of the system? • How would a change on the condenser (high side) affect the evaporator (low side) in a TXV system?
• Identify which side of the system (high side vs low side) the condenser is on. • Decide whether noncondensables make heat rejection easier or harder in the condenser. • From that, determine whether condenser (high side) pressure will rise or fall and how that compares to the options.
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