Ice storage air conditioning system with direct cooling function

Abstract

The invention discloses an ice storage air conditioning system with a direct cooling function. A double-mode water tank is adopted for supplying an ethylene glycol solution and an aqueous solution alternately to the heat exchange medium side of an evaporator main body, an ethylene glycol solution circulating loop is established between the heat exchange medium side of the evaporator main body andan ice storage tank, an aqueous solution circulating loop is established between the heat exchange medium side of the evaporator main body and water cooling equipment, and another solution circulatingloop is established between the ice storage tank and the water cooling equipment. According to the ice storage air conditioning system, a plate heat exchanger does not need to be additionally arranged under cooling working conditions, high-temperature water directly enters an ice storage unit to release heat, and the COP can be increased by 5%-10%; under cooling working conditions, water directlyenters the evaporator main body for performing heat exchanging, the number of resistance links of a transmission and distribution system is decreased, and the transmission and distribution energy consumption can be greatly reduced; the numbers of transmission and distribution pipelines and heat exchange links of the air conditioning system are decreased, and heat loss in the transmission and distribution process can be reduced; and the number of heat exchange equipment, transmission and distribution equipment and corresponding connecting pipelines of the air conditioning system is decreased,and accordingly, the initial investment can be greatly reduced by 10-20%.

Description

technical field [0001] The invention relates to an air-conditioning system, in particular to an ice-storage air-conditioning system for direct cooling. Background technique [0002] With the implementation of the peak-valley electricity price, the ice storage air-conditioning system has been widely used. In the existing design mode, in order to ensure the safe operation of the ice storage air-conditioning system, the ethylene glycol solution on the cold source side and the aqueous solution on the user side are separated by a plate heat exchanger. The above design mode has produced many disadvantages in actual operation: 1) The existence of the plate heat exchanger leads to a heat transfer temperature difference between the cold source test and the user side, thereby reducing the evaporation temperature of the ice storage unit, which in turn leads to a decrease in the COP of the ice storage unit ; 2) The cold loss of the solution on the cold source side and the user side of ...

AI Technical Summary

Problems solved by technology

The above design mode has produced many disadvantages in actual operation: 1) The existence of the plate heat exchanger leads to a heat transfer temperature difference between the cold source test and the user side, thereby reducing the evaporation temperature of the ice storage unit, which in turn leads to a decrease in the COP of the ice storage unit ; 2) The cold loss of the solution on the cold source side and the user side of the plate heat exchanger is inevitable during the heat exchange process; 3) The resistance of the ethylene glycol solution is significantly higher than that of the aqueous solution, and the cooling capacity is significantly lower than that of the aqueous solution, resulting in the transmission and distribution energy. 4) The addition of plate heat exchangers increases the resistance components of the transmission and distribution system, which in turn leads to an increase in transmission and distribution energy consumption

The main reason for the current situation is that the air conditioning system did not consider the various adverse effects brought about by adding plate heat exchangers for ice storage at the beginning of the design. In order to eliminate the existing disadvantages, a better solution needs to be proposed

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