Getting heat from inside a box to outside a box sounds like work. It is precisely that, and represents the first half of the refrigeration cycle.
The Refrigeration Cycle, Part One
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Roberts
The Role of the Thermal Expansion Valve (TXV)
The TXV performs two tasks. First, it monitors the temperature of the evaporator core outlet. Second, it controls the amount of refrigerant entering the evaporator core inlet.
The Principle of Latent Heat
Latent heat disappears, but that heat does not cease to exist, just that we cannot measure it with a thermometer. Understand how making use of latent heat is what makes an HVAC system efficient.
HVAC Systems: So, What Is a Micron, Part 2
Do you need a micron gauge? That is an economic decision, but if you are conscientious as well as under time constraints, you may find that a micron gauge saves time by avoiding either over pumping to be on the safe side or just hoping that you get enough of the air out.
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