Quote:
Originally Posted by teoman
What is a txv?
You want to build a swamp cooler for the condenser or have the air vents blow through a swamp cooler?
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A TXV is a thermal expansion valve. Basically it is a valve that restricts the flow of refrigerant through the system to create a pressure difference between the high and low side of the system, which is what makes it work. How far it is open is controlled by the temperature of the return refrigerant. As it gets colder, it closes to reduce refrigerant flow.
The alternative is a fixed orifice, which is basically nothing more than a small hole that the refrigerant passes through to restrict its flow. A TXV is a better design because it can adjust itself to optimize the system's performance under a wider range of conditions than a simple fixed orifice can. Also, systems with a TXV don't tend to cycle the compressor as much.
Since a TXV is a variable valve that constantly adjusts itself to get the most performance and efficiency out of the system under the conditions its operating in, they tend to respond better to lower ambient conditions (or simulating a lower ambient by spraying the condenser with water) than a system with a fixed orifice would. I hope this helps