Heat supplying system

Abstract

The invention provides a heat supplying system which comprises an absorption heat pump and a water path system. The absorption heat pump comprises a generator, a condenser, an absorber and an evaporator. The water path system comprises a primary side water path and a secondary side water path. The secondary side water path comprises a first branch and a second branch which are in parallel connection, and the absorber and the condenser are in serial connection to the first branch. The primary side water path can exchange heat with the generator, the second branch of the secondary side water path and the evaporator. According to the heat supplying system, the primary side water path only exchanges heat with the generator, the second branch of the secondary side water path and the evaporator. Compared with the prior art, heat exchange of an electric heating pump evaporator is reduced, the hot water resistance on the primary side is effectively reduced, a primary side water pump is removed, and the system is simpler. In addition, the resistance is reduced, the flow speed in the evaporator is increased, the evaporator can be designed with the larger flow number, and the heat exchanging efficiency of the evaporator is improved.

Description

technical field [0001] The invention relates to the technical field of heat supply, in particular to a heat supply system. Background technique [0002] In the prior art, the combined heat and power central heating system is widely used in the heating of cities and towns in northern my country. In the cogeneration central heating system, reducing the return water temperature of the primary network of the central heating system is beneficial to recover the condensation heat at the cogeneration heat source for heating, which can greatly improve the efficiency of the cogeneration system. In the prior art, Chinese patent ZL2008101010645 proposes a heat exchange unit of an absorption heat pump, which can reduce the return water temperature of the primary network at each thermal station of the heat network. ZL2011102465935 proposes another compound heat exchange unit, which adds an external series-connected compression heat pump unit on the basis of ZL2008101010645, which can fur...

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Problems solved by technology

[0003] However, the simple absorption cycle and single-stage heat pump heat exchange unit proposed by ZL2008101010645 can only reduce the return water temperature of the primary network to above 30°C when the water supply temperature of the primary network is low (such as 100-110°C).

Due to the insufficient cooling capacity of the return water of the primary network, the heat recovered from the condenser at the heat source is limited

The composite heat exchange unit proposed by ZL2013106819695 can further reduce the return water temperature of the primary network, but it requires an absorption heat pump and a compression heat pump to be connected in series, resulting in an increase in unit size, cost, and primary network resistance.

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