Heat pump hot water system and control method thereof

Abstract

The invention discloses a heat pump hot water system and a control method thereof. The system comprises a hot water system, a heat pump system and a control device, wherein the heat pump system comprises a main refrigerating agent loop, two or more water-refrigerating agent heat exchangers arranged on the main refrigerating agent loop in a series connection manner, and a refrigerating agent bypass branch circuit; the hot water system comprises a main water pipeline and a water way bypass branch circuit; the main water pipeline penetrates the interiors of the two or more water-refrigerating agent heat exchangers and exchanges heat with the main refrigerating agent loop; the control device is used for controlling at least two of the two or more water-refrigerating agent heat exchangers to be connected in parallel when the needed temperature difference between cold water and hot water is smaller than or equal to a preset value so that the at least two water-refrigerating agent heat exchangers can correspondingly exchange heat in a parallel connection manner. According to the scheme, the defects that in the prior art, the power consumption is large, the energy efficiency is low, and the user experience is poor can be overcome, and the beneficial effects that the power consumption is small, the energy efficiency is high, and the user experience is good are achieved.

Description

technical field [0001] The invention belongs to the technical field of heat pump heat exchange, and in particular relates to a heat pump hot water system and a control method thereof. Background technique [0002] A heat pump is a device that can obtain low-grade heat energy from natural air, water or soil, and transfer the heat energy of a low-level heat source to a high-level heat source through electricity to provide people with high-grade heat energy that can be used. At present, the heat pump hot water system is a primary heat exchange or circulating heat exchange heat pump hot water system. For the primary heat exchange heat pump hot water system, the design of the system and heat exchanger is mostly based on the test standard, so only the large temperature rise and small flow rate during the primary heat exchange are considered, and the possible small flow rate is not considered. Temperature rise and large flow. [0003] For example: when there is a small temperatur...

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Problems solved by technology

[0005] The object of the present invention is to provide a heat pump hot water system and its control method in view of the above defects, so as to solve the problem in the prior art that when a small temperature rise occurs in the heat exchange process, the power consumption of the circulating water pump needs to be increased due to the increase of the water flow rate. problem, to achieve the effect of reducing power consumption

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