The heat exchanger of the chiller is a heat exchanger in which the refrigerant boils and, due to this, cools the coolant, which is then fed to the fan coil units. With an increase in the chiller capacity, the heat exchange surfaces in all heat exchange elements of the chiller increase. But the biggest change in heat transfer surface area is required from the evaporator (water-refrigerant heat exchanger).
Microchannel heat exchanger manufacturer offers two heat exchangers: an evaporator and a condenser. An evaporator heat exchanger is a unit in which the refrigerant boils. Its task is to cool the heat-removing medium (as a rule, it is water) to the required temperature so that in the future this medium is able to remove heat in a given amount from the object to be cooled. Depending on the capacity declared by the manufacturer, various models of chillers have different evaporators:
- Shell and tube.
A plate heat exchanger works most efficiently as an evaporator – its efficiency reaches 95%, moreover, it is more compact than others. Therefore, lamellar are actively replacing shell-and-tube devices in air conditioning systems. They can be soldered and collapsible. The plates are made of stainless steel. The collapsible version of the apparatus is easy to operate, maintain and repair.
The condenser in the refrigeration cycle performs the function of dumping heat into the environment. They are subdivided into air and water according to the type of cooling medium. Due to the differences in the exchange coefficients of gas and liquid, different versions of capacitors with various technological features of the models have been launched into production.
When the condenser is air-cooled, heat is transferred to the air. To minimize the size, the entire system is blown by a strong airflow from the fan.