Duty of Evaporator in Cooling System
Evaporator in the cooling system; is the cooling element where the refrigerant evaporates and receives heat from the environment.
In other words; evaporator is a cooler. Evaporators are designed in various types according to their area of use and application.
Types of Evaporators Used in Commercial Cooling Systems
Standard Cold Room Evaporators
In general, this type of evaporator is used in cold storages that are established for product storage at -5/+ 5 °C and -18/-25 °C.
Double Blown Ceiling Type Cold Room Evaporators
In general, this type of evaporator is used in cold stores that have been established with the aim of product processing at +12/+18 °C.
Single Blown Ceiling Type Cold Room Evaporators
In general, this type of evaporator is used in small volume cold stores which are installed for storage of -5 /+5°C and -18/-25 °C.
Evaporators for Blast Freezing Rooms
In general, this type of evaporator is used in cold stores that have been established for product shocking at -35/-40 °C.
Working Principles of Evaporators
Cold room evaporators can provide higher capacity with less heat transfer surface area by circulating the air in the environment to be cooled with a fan. In this type of evaporators, fans can be installed in such a way that blower or absorber can work.
According to forced air movement, it is possible to count the evaporators in three main groups
- Low speed coolers: Air velocity between 1-1.5 m/s, (+ 12/+18) (6-8 mm Fin Range)
- Medium speed coolers: Air velocity between 2.5-4 m/s (-5/-25) (8-10 mm Fin Range).
- Blast Evaporators (High Speed Coolers): Air velocity is between 4-10 m/s. (10-12 mm Fin Range) Soldered Plate Heat Exchangers
Soldered Plate Heat Exchangers
The cooler exchanger enters the lower left inlet as cold gas and begins to evaporate on the surfaces of the pipes.The refrigerant emits as steam from the upper right outlet.
The light and dark blue arrows in the closed evaporator picture point to the location of the refrigerant connections. And the light and dark red arrows point to the cooled liquid (such as water-glycol) joints.
Soldered plate heat exchangers are used in Chiller applications, fan coil, heat-pump, ice skating and in similar applications.
Shell Tube Heat Exchangers
The cooler shell enters the tube heat exchanger as cold gas through the lower left inlet and begins to evaporate on the surfaces of the pipes. The refrigerant evaporates from the lower right outlet.
In the picture, the closed shell tube heat exchanger shows the location of the light green cooler and the light blue arrows show fluid cooler (like water-glycol) connections.
Shell tube heat exchangers are used in chiller applications, fan coil, heat-pump, ice skating and in similar applications.