The closed loop system

Heat naturally flows from warmer to cooler temperatures. In the framework of this agreement, therefore, the refrigerant absorbs heat from outdoor air and refuses the warmth of the air in the room. Space will soon reach a temperature of external air. What is really needed is a way to move the heat from the lower temperature region (air) to higher (outdoor). Like moving water uphill, it works against the laws of nature and therefore requires mechanical energy.

Also note that this closed cycle cooling "system" has an outdoor coil boiling point of liquid refrigerant in pairs, while the internal heat exchanger steam condenses, the refrigerant in the liquid. We must rearrange the pressures and temperatures in the cooling system so that just the opposite occurs. The internal heat exchanger must evaporate the liquid refrigerant gases, absorbing heat from the air in the room. He will cool the air in the process. Outdoor coil must condense a gas-refrigerant in the liquid through the transfer of heat from the refrigerant in the outer air.

Adding a compressor and a metering device solves the problem, making it a mechanical refrigeration system. These two components will allow us to do two things that were not possible without them. First, compressor allows us to add into mechanical energy for the refrigerant so that the heat can be forced to flow "in the mount." Secondly, they allow us to create two pressure zones in the same system.

Our system must absorb heat from the air in the room to keep it cooler than indoors and outdoors. Refrigerant in the system to absorb heat by evaporation (boils). We need a system that will evaporate refrigerant at a low enough temperature, the heat will flow from the indoor air in the refrigerant in the evaporator. In a comfort air conditioning system, normal saturation temperature of the refrigerant in the evaporator 40F. Heat will flow down from 75F of air flowing through the coil 40F refrigerant inside. As the pressure and evaporating temperature is directly linked to all liquids, the refrigerant can be done to evaporate to the desired temperature, simply by changing the pressure at the right level. For R-22, saturation temperature of 40F happens under the pressure of about 69 pounds per square inch.

Our system also must reject heat from the refrigerant in outside air to move the heat from the building and make reusable refrigerant in the evaporator next time it goes around the system. Refrigerant directs the heat when it is condensed from the gas to a liquid. We need a system that will condense in the refrigerant at a sufficiently high temperature, heat will flow from the refrigerant inside the heat exchanger of the condenser in the fresh air flowing through the coil. Normal saturation temperature of the refrigerant in the air-cooled condenser 95F outdoors near 120F. in the evaporator, water pressure will change the state of the refrigerant at the right temperature. For R-22, saturation temperature of 120F happens at a pressure of about 263 PSIG...