Chiller Technical Information　4-2. If the cooling object is a liquid

This section explains how to connect liquid-cooled heat exchangers and their characteristics.

If the cooling object is a liquid, it will be cooled using a heat exchanger as described in Section 2-2. Liquid-cooled heat exchanger (liquid to liquid).
Different types of heat exchangers were described in 2.2 but here we will explain how to incorporate heat exchangers into the piping path specifically based on their respective characteristics.
There are many different methods of liquid cooling, but four cooling methods as given in Figure 1 below are introduced here.

Figure 1. Example of a liquid cooling method

(1) Addition of heat exchanger, pump

Composed of a new circulation circuit by adding a heat exchanger and a pump to the tank of the liquid to be cooled, this method cools the liquid indirectly with the cooling water. An additional heat exchanger and pump are necessary, but the parts can be selected from the beginning according to the specifications and physical properties of the liquid to be cooled. The layout can also be determined flexibly according to the current situation.

(2) Additional heat exchanger (insert into existing circuit)

(2) Additional heat exchanger (insert into existing circuit)
Compared to the existing method in (1), a new pump need not be installed, and both cost and man-hours can be expected to be reduced as the piping can be shared.
As a precaution, it is necessary to check whether there is any impact on the existing piping path, or whether cooling can be carried out reliably.

(3) Throw-in heat exchanger

In this method, a throw-in heat exchanger is immersed in the liquid to be cooled.
The heat exchanger is immersed in the tank, making it easy to install. However, since the cooling efficiency is lower compared to the existing efficiency in (1) and (2), the heat exchanger becomes larger and in some cases, agitation is also necessary to improve heat transfer efficiency. In addition, if the cooling water is significantly colder than the outside air temperature, water may condense on the heat exchanger and piping and also flow into the liquid to be cooled.

(4) Jacket tank

In this method, the liquid in the inner tank is cooled by pouring cooling water into the jacket of the jacket tank. As the system itself is simple, implementation is easy and the inside of the tank can also be cleaned easily.
Similar to the throw-in heat exchanger, the heat exchange efficiency is low and stirring is required.

Summary

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