Combined type heat exchange unit

Abstract

The invention relates to a combined type heat exchange unit. The combined type heat exchange unit is characterized in that a compression heat pump, an absorption heat pump, more than one water-water heat exchanger and connecting pipelines are included; the connecting pipelines are divided into the primary side pipeline and the secondary side pipeline; the primary side pipeline is in a step-by-step series connection, namely the primary side pipeline is sequentially communicated with a generator of the absorption heat pump, the water-water heat exchanger, an evaporator of the absorption heat pump and an evaporator of the compression heat pump; the secondary side pipeline is communicated to a heat consumer in the mode of first parallel connection and then series connection or step-by-step series connection or independent separating connection. According to the combined type heat exchange unit, the heat of primary network hot water can be utilized in a gradient mode, so that the temperature difference of water supply and water return of primary network hot water of a centralized heating system is greatly increased. Accordingly, the initial investment of a pipeline system and the power consumption of water pump operation can be greatly reduced, conditions are created for utilizing low-grade heat energy and even waste heat and the like of a power source, the comprehensive energy utilization efficiency of the system is improved, and the heat supply cost is lowered.

Description

technical field [0001] The invention relates to a heat exchange unit used for heating and hot water supply, in particular to a composite heat exchange unit capable of greatly increasing the temperature difference between primary network hot water supply and return water in a central heating system, belonging to the field of energy technology . Background technique [0002] As the scale of urban central heating continues to increase, the high-temperature hot water generated by centralized heat sources often has to be transported over a long distance to reach the heat user. In order to expand the heating area, reduce transportation costs, and create conditions for the recovery of waste heat from power plants, Fu Lin of Tsinghua University and others proposed an invention patent with the patent number: ZL200810101064.5 and the invention name: "A heat pump heat exchange unit". This patent uses heat exchange and hot water driven absorption heat pump composite technology to solve...

AI Technical Summary

Problems solved by technology

[0003] 1) Restricted by the water supply temperature of the heating network: Due to the design temperature or operating years of some heating systems, the primary network cannot deliver hot water exceeding 115°C, resulting in low water temperature entering the generator of the absorption heat pump heat exchange unit. For the absorption heat pump, the driving force will be insufficient, so it is difficult for the outlet water temperature of the absorption heat pump heat exchange unit to drop below 35°C, which limits the exp

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