Phase-change energy-storage air-conditioning system

Abstract

The invention relates to a phase-change energy-storage air-conditioning system. The phase-change energy-storage air-conditioning system structurally comprises a cooling tower, a cooling water circulating pump set, a refrigeration host, a terminal load, a chilled water circulating pump set and a cold-storage circulating system, wherein the refrigeration host comprises a condenser and an evaporator, and the cold-storage circulating system comprises a cold-storage tank, a variable-frequency water pump and a plurality of electric valves. The phase-change energy-storage air-conditioning system has the advantages that multiple kinds of cold-storage and cold-discharge modes can be transformed flexibly by means of controlling the electric valves to open and close, so that the refrigeration host is kept at the optimal energy efficiency ratio state to work, an optimal energy-saving effect is achieved, the 'power peak shaving and valley filling' performance is optimized, most stable chilled water outlet temperature can be obtained and the refrigeration performance is improved; meanwhile, the capacity of the refrigeration host can be expanded, the integral installed capacity and power supply equipment of the system can be decreased substantially, and a huge sum of initial installation fees can be saved; additionally, the phase-change energy-storage air-conditioning system is simple in structure, small in occupied space and quite convenient to apply.

Description

technical field [0001] The invention relates to an energy-storage air-conditioning system, in particular to a phase-change energy-storage air-conditioning system that uses phase-change materials to store and release cold. Background technique [0002] At present, due to the increasing power load of the air conditioning system and the overlap of peak power consumption, the grid load is unbalanced, resulting in a power shortage during peak power consumption and a huge waste of electric energy during low power consumption. In order to solve the above problems, and to achieve the energy-saving effect of "shifting peaks and filling valleys", air-conditioning energy storage technology has been developed rapidly, that is, by storing electricity in the form of cold energy during the low-power consumption period, and reusing the stored energy during the peak period of power supply Cooling capacity is placed in the air conditioning system. [0003] Traditional air-conditioning ener...

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Problems solved by technology

For example, Chinese patent CN202747502U discloses a cooling water system based on phase change material cold storage. The phase change material used in this system is a gas-liquid phase change material. The volume of the gas-liquid phase change material changes greatly during the phase change process, and then A large-volume cold storage tank is required, which is extremely inconvenient for application. At the same time, the energy storage density of the gas-liquid phase change material is relatively low, and the phase change temperature range is relatively small, and only when the outdoor wet bulb temperature is lower than that of the gas-liquid phase change material When the phase change temperature is reached, the cold storage tank can store cold, which also has great limitations on the wide application of gas-liquid phase change materials; the cold storage tank in this system stores cold water flowing out of the cooling tower, due to cooling The temperature of the cooling water in the tower is greatly affected by the outside temperature. When the temperature of the cooling water flowing out of the cooling tower is higher, the cold storage capacity of the cold storage tank is less, which leads to the improvement of the cooling capacity of the entire system when the cold storage tank is discharged. Effect, operating efficiency, energy saving, etc. have little effect; in addition, the cold storage and cooling mode of the system is relatively single, and the system operating mode cannot be flexibly changed according to actual needs to achieve the best operating efficiency and energy saving effect, so that it cannot Achieve optimized "peak-shifting and valley-filling" performance

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