Heat exchange unit

Abstract

The invention provides a heat exchange unit, comprising a hot water type absorption heat pump, a water-water heat exchanger, a primary side pipeline and a secondary side pipeline; wherein the hot water type absorption heat pump includes a generator, a condenser , absorber and evaporator, the water supply pipe of the primary side pipeline is connected to the high temperature side of the water-water heat exchanger, the evaporator and the return water pipe of the primary side pipeline in turn, and the return water pipe of the primary side pipeline is connected to the heat source; The water supply pipe of the side pipeline includes a first branch and a second branch. The first branch is connected to the absorber, the condenser and the return pipe of the secondary side pipeline in turn; the second branch is connected to the water-water heat exchanger in turn. The low temperature side and the return pipe of the secondary side pipeline after the generator. The heat exchange unit of the present invention reduces the resistance of water entering the primary network, lowers the temperature of the return water of the primary network, thereby increasing the recovery of heat from the condenser at the heat source, and improving the efficiency of the cogeneration central heating system.

Description

technical field [0001] The invention relates to the technical field of heating equipment, in particular to a heat exchange unit. Background technique [0002] Generally, urban heat supply adopts cogeneration centralized heating system, but the efficiency of cogeneration system is low due to the high return water temperature of the primary network in the existing heating system. At present, ZL2008101010645 proposes a heat exchange unit of an absorption heat pump, which can reduce the temperature of return water in each heat station of the heat network in turn, but when the water supply temperature of the primary network is low (100 ° C ~ 110 ° C), it can only The temperature of the return water in the primary network is reduced to above 30°C. Due to the insufficient cooling capacity of the return water in the primary network, the heat recovered from the condenser at the heat source is limited. ZL2011102465935 proposes another compound heat exchange unit, which adds an extern...

AI Technical Summary

Problems solved by technology

Although the compound heat exchange unit can further reduce the return water temperature of the primary network, it requires an absorption heat pump and a compression heat pump to be connected in series, resulting in an increase in the volume of the unit, an increase in cost, and an increase in the resistance of the primary network

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