Ice water mixture cold storage air conditioning system and control method thereof

Abstract

The invention discloses an ice water mixture cold storage air conditioning system. The ice water mixture cold storage air conditioning system structurally comprises a compressor, a reversing device, acooling device, an evaporator, a cold storage device, a first throttling mechanism, a second throttling mechanism, a water absorber, a low-temperature water circulating pump, a first regulating valve, a water distributor and a tail end freezing water circulating system. When the ice water mixture cold storage air conditioning system stores ice, a low-temperature water circulation area is established around the evaporator through a low-temperature water circulation system, so that a refrigerant makes ice by convection heat transfer with water, and meanwhile, the low-temperature water circulation area can further accelerate the ice making speed of the evaporator. In addition, the invention further provides a control method. An ice layer is timely separated from the evaporator in the ice storage process so as to maintain the heat exchange intensity of the refrigerant and water of a refrigeration unit in an optimal state, the heat exchange efficiency is improved, and the energy consumption is reduced. Because the heat exchange link between an intermediate medium and a cold storage medium and multiple groups of circulating water pumps are omitted, the equipment and investment cost involved in the system can further be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of cold storage air conditioning, in particular to an ice-water mixture cold storage air conditioning system and a control method thereof. Background technique [0002] The ice storage central air-conditioning system is an ideal and effective measure to "shift the peak and fill the valley" to balance the unbalanced peak and valley of the city's day and night electric energy. During the low electricity price period at night, the refrigeration system of the ice-storage central air-conditioning system produces ice for cold storage. Although the energy consumption of ice-making is higher than that of chilled water, since the low-valley electricity price is usually only a quarter of the daytime peak electricity price, it can still save energy. Partial air conditioning fee. During the peak hours of electricity consumption during the day, the cooling capacity of the air conditioner comes from the melting of the ic...

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN101082434A discloses a self-circulating cold storage air conditioning system, which can save low-temperature refrigerant (such as brine or ethylene glycol solution, etc.) In the above two heat exchange circuits, the ice layer that has been frozen outside the heat exchange coil is not removed during the cold storage process, and the cold storage medium is always in a static state, and its heat exchange form is heat conduction, so as the ice layer As the thickness increases, the energy consumption of the system increases

Another example is the Chinese patent CN104279667A which discloses a phase change energy storage air conditioning system. The main cooling process of the system still needs to go through the above two heat exchange circuits during cold storage. The intermediate medium is chilled water. The refrigerant inside exchanges heat with the frozen water, turning the frozen water into low-temperature frozen water, and then the low-temperature frozen water is transported to the inside of the ice storage tank by the delivery pump to exchange heat with the solid-liquid phase change material inside the ice storage tank, so that the solid-liquid phase The solidified phase change material is gradually solidified, but the system does not separate the solidified phase change material from the heat exchange surface of the two media during the cold storage process, and the solid-liquid phase change material is always in a static state, and its heat exchange form is heat conduction, so As the thickness of the solidified layer increases, the energy consumption of the system will also increase

[0004] In addition, due to the large number of heat exchange circuits, circulating water pump sets, pipelines, and valve components, the ice storage central air-conditioning system occupies a large space and the initial investment cost is high.

[0005] To sum up, the current ice storage air-conditioning system has the disadvantages of multiple heat transfer links in the process of ice storage and ice melting, large comprehensive thermal resistance, high energy consumption, and high initial investment cost.

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