What is a heat exchanger? The exchange of heat is necessary in order for HVAC to perform its job. Convection, conduction and convention have to occur. These energy processes must occur to allow HVAC to function. For instance, an example could be the sun. Air and water comprise the two principal fluids that are used found in HVAC systems. In an HVAC system can use water or air to operate. If you are installing HVAC systems it is necessary to select either a coil or plate model. There are also two tubes. The heat gets transferred into the fluid that is outside from the hot inner liquid. Thin plates are constructed out of steel and held onto one side. Another fluid is then used to carry the metal away for convection. It’s quite common to have a cooling or heating coil. Steam or water flows within or out when it is heating air. The wall on the side is responsible for the transfer of heat energy. Everything is linked to pipes. Heat exchanges in duct place use heat without the need for water. They are constructed of tiny sheets of aluminum and typically, air is used in both processes. gm1eulj2xg.