Solution for dual temperature cold storage - using electronic expansion valves to solve the problem

There is a 300 cubic meter cold storage, and the owner said he sometimes has to work at 18 degrees Celsius and sometimes at 4 degrees Celsius.
To consider refrigeration efficiency, we used to use two expansion valves, one for high temperature and one for low temperature, controlled by two solenoid valves,
Now we use electronic expansion valves to solve this problem, because electronic expansion valves have a large cooling capacity span and are convenient to solve. When working at high and low temperatures, the refrigeration efficiency is comparable

The electronic expansion valve consists of a four piece set, including the valve body, driver, low-pressure sensor, and suction temperature probe. Shanghai Kubao Refrigeration Equipment Company can integrate the entire set of electronic expansion valves into the air cooler, which greatly facilitates customers. When selecting electronic expansion valves, both high-temperature and low-temperature conditions should be considered, and the cooling capacity can be appropriately increased

As shown in the figure, when installed in this way, as long as the driver is powered and the start signal is given, the electronic expansion valve can work.
The electronic foot expansion valve can be set to a minimum opening to prevent refrigeration system failures

Because the air cooler operates in a low-temperature and humid environment, the driver is designed to be waterproof,
If required for PLC control, the parameters of the driver, such as the current superheater of the electronic expansion valve, the set superheat degree, the current number of open steps, etc., can be transmitted to the touch screen through a 485 communication interface.

The driver is constantly powered on, with one three core wire and one two core wire coming from the control box. Among them, there are three core wires, one core is always powered on, one core is synchronized with the solenoid valve and equipped with an intermediate relay to provide the startup signal, one core is a neutral wire, and if data transmission is required, a two core wire is also needed. Ordinary control boxes can also be used. However, there is no data displayed.
If using a remote module, an IoT control box can also be used to view data such as heat and opening degree on a mobile phone

Shanghai KUB Refrigeration Equipment Co., Ltd.

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