Inside, the refrigerant collects more heat to carry outside. It is that change in pressure that causes refrigerant to flow through the system – from high pressure in the outdoor unit to low pressure in the indoor unit. From physics, we understand that substances flow from a place of high pressure toward lower pressure. This raises the pressure of the refrigerant. Secondly, and here is the answer to the question at hand, the compressor compresses the refrigerant. It has fins to maximize surface area for fast heat transfer to outside air. The heat is transferred through the outdoor coil, which is also radiator-like. That is essential for heat to leave the refrigerant, since heat likes to balance out, flowing from hotter to cooler space. It gets so hot that the outside air, even on a hot summer day, is cooler than the refrigerant. First, as the refrigerant vapor is compressed, its temperature rises – the same amount of heat in less “space” makes it hotter. The compressor has one hugely important purpose – it compresses the high-pressure gas vapor back into a low-pressure gas. This is where our discussion gets to the topic at hand. The Condensing unit outside contains the compressor. The other line carries cooled refrigerant from the condenser unit to the indoor/evaporator coil.Ĥ). One line carries refrigerant vapor from the evaporator coil to the condensing coil outside. Refrigerant line set: The lines running between coils are often copper, but synthetic materials are used in some AC types. AC makes the air in your home cooler and drier, and dry air is more comfortable than damp air.ģ). The water runs down the slope of the A-coil, and is drained away. That chilled air is pushed into your ductwork by the blower motor, and the blower also pulls in warm air to be cooled.Īs a side note, the evaporator coil gets really cold, and moisture from the air condenses on it. As it does that, it collects surrounding heat to carry from your home – and the air in your home gets cooler.
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