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The ice-storage air-conditioning central air-conditioning system also makes use of the period and the price difference between the peak and valley of electricity consumption of the State Grid for arbitrage. It also uses the latent heat of ice during the trough period of electricity consumption. On the basis of the original water machine, it refers to the use of dual-mode refrigeration hosts. Ice is made in the low power period at night, and stored through the energy storage device-ice tank, and it is cooled during the peak power consumption period to save electricity bills. The government adopts the ice storage technology of power demand side management to achieve peak shifting and valley filling and reduce substation equipment, which is one of the effective solutions to alleviate the contradiction between power construction and new power consumption.

Equipment composition of ice storage air conditioning system: Simply put, it is an ice storage device and system added to the conventional central air conditioning system. That is, the main equipment is composed of chillers, water pumps, cooling towers, air conditioning terminals, ice storage devices and automatic control systems.

Ice storage classification: Ice storage is mainly classified as follows according to the different ice storage forms, cold storage rings, etc., see the following table

Ice storage uses the latent heat of melting ice of 335kJ/kg (80kcal/kg). The volume of the cold storage tank depends on the percentage of ice water in the tank. Generally, the volume of the ice storage tank is 0.068~0.085m3/RTH (0.02~0.025m3/kWh). The storage temperature of ice storage is -0°C, the freezing point of water. In order to freeze the water, the refrigerator should provide a temperature of -3 to -7°C, which is lower than that provided by conventional refrigeration equipment for air conditioning. Of course, the ice storage device can provide a lower air-conditioning water supply temperature, which is beneficial to increase the temperature difference between the air-conditioning supply and return water, so as to reduce the pipe size and the power consumption of the water pump.

Ice storage coil: An ice coil type cold storage device is an ice storage device with a heat exchange surface formed by a coil immersed in a water tank. During the cold storage process, the refrigerant (generally 25% by weight ethylene glycol aqueous solution) or refrigerant circulates in the coil, absorbs the heat of the water in the water tank, and forms an ice layer on the outer surface of the coil. There are two ways to take the cold: internal melting ice and external melting ice, each with its own characteristics.

Ice storage central air conditioning system diagram

Dynamic ice: refers to the separation of the ice making device and the ice storage device. During the ice storage process, the ice is intermittently or continuously separated from the ice making device and transported to the ice storage device. The ice storage process is frozen multiple times or completed continuously. From the initial stage to the end of ice making, the amount of ice production remains unchanged. After the ice making process is over, there is no residual ice in the ice making device, so it is called dynamic ice storage. Fluid ice system is one of the types of dynamic ice storage.

Shenzhen Taiwa Energy Technology Co., Ltd. provides full-process services from ice storage feasibility analysis, scheme design, construction, operation and maintenance, etc., and has patents and software related to ice storage. The company's self-developed ice storage control system is even more Unique in the industry.