Common auxiliary accessories of industrial chillers, including water flow switch, pressure controller, differential pressure controller, temperature controller and solenoid valve, and a brief introduction of three refrigeration methods: liquid vaporization refrigeration, gas expansion refrigeration and thermoelectric refrigeration.

Common auxiliary accessories for chillers:

1. Water flow switch

The water flow switch of the chiller is used as the control or cut-off protection of the fluid flow in the pipeline. When the fluid flow reaches the set value, the switch automatically cuts off (or turns on) the circuit.

2. Pressure controller

The industrial chiller pressure controller is used for pressure control and pressure protection. The unit has low pressure and high pressure controllers, which are used to control the working range of the system pressure. When the system pressure reaches the set value, the switch will automatically cut off (or turn on) circuit.

3. Differential pressure controller

The differential pressure controller is used to control the differential pressure. When the differential pressure reaches the set value, the switch will automatically cut off (or switch on) the circuit.

4. Temperature controller

The temperature controller is used for the control or protection of the unit. When the temperature reaches the set value, the switch automatically cuts off (or turns on) the circuit. In our products, the temperature control is often used, and the temperature of the water tank is used to control the start and stop of the unit. .There are also some like antifreeze that need to use a temperature controller.

5. Solenoid valve

When the compressor is stopped, the system circuit is cut off to avoid liquid shock when the compressor is started next time. Generally used in larger refrigeration systems.

Three cooling methods

Liquid gasification refrigeration:

1. Compression: Normal temperature gaseous state becomes high pressure and high temperature gaseous state
2. Condensation: high pressure and high temperature gaseous state becomes high pressure liquid state
3. Evaporation: The high-pressure liquid state changes into a low-pressure gas state, which absorbs heat and realizes refrigeration.

Gas expansion refrigeration:

Gas expansion refrigeration uses the adiabatic expansion of high-pressure gas to achieve low temperature, and uses the reheating process of the expanded gas under low pressure to refrigerate. The gas is expanded by the expander and has external power output, so the temperature drop of the gas is large, and the cooling capacity is also large when reheating, but the structure of the expander is more complicated. Another way is to expand the gas through a throttle valve without external work output. The temperature drop of the valve is small, and the cooling capacity is also small, but the structure of the throttle valve is relatively simple, which is convenient for adjusting the gas flow.

Thermoelectric cooling:

The charge carrier moves in the conductor to form a current. Since the charge carrier is in different energy levels in different materials, when it moves from a high energy level to a low energy level, it will release excess heat. On the contrary, it needs to absorb heat from the outside world. (i.e. performance as cooling).