Heating system

Abstract

The invention provides a heat supply system, which includes an absorption heat pump and a waterway system. The absorption heat pump includes a generator, a condenser, an absorber and an evaporator. The waterway system includes a primary side waterway and a secondary side waterway; the secondary side waterway It includes a first branch and a second branch connected in parallel, wherein the absorber and the condenser are connected in series on the first branch; the primary side water circuit exchanges heat with the generator, the second branch of the secondary side water circuit and the evaporator. According to the heating system of the present invention, since the primary side waterway only exchanges heat with the generator, the second branch of the secondary side waterway, and the evaporator, compared with the prior art, the heat exchange of the evaporator of the electric heat pump is reduced, which can effectively reduce Primary side hot water resistance, no longer need to set the primary side water pump, making the system simpler. In addition, due to the reduced resistance, the flow rate in the evaporator increases, so that the evaporator can be designed with more flow numbers, thereby improving the heat exchange efficiency of the evaporator.

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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