Instead of having to use the Print Screen button and then paste into Paint (or a similar application), you can now automatically save a screenshot to the Pictures folder as a png with just the touch of a couple of buttons. Here's how. 1.
Thermostatic expansion valve or TEV is one of the most commonly used throttling devices in the refrigerator and air conditioning systems. The thermostatic expansion valve is the automatic valve that maintains proper flow of the refrigerant in the evaporator as per the load inside the evaporator.
A thermostat is an instance of a  bang-bang controller  as the heating or cooling system output is not proportional to the difference between actual temperature and the set temperature; the equipment runs at full capacity until the set temperature is reached, then shuts off.