Ground source assisted waste heat gradient utilization water source heat pump hot water system

Abstract

The invention discloses a ground source assisted waste heat gradient utilization water source heat pump hot water system which comprises a clear water inlet pipe, a heat exchanger, a heat pump A, a heat pump B, a heat pump C, a bathing wastewater inlet pipe, a buried pipe A, a hot water output pipe and a wastewater discharge pipe. The clean water inlet pipe and the bathing wastewater inlet pipe are respectively connected with the heat exchanger, the heat exchanger, the heat pump A and the heat pump B are sequentially connected in series, the wastewater discharge pipe is connected with an evaporator A in the heat pump A, and the hot water output pipe is respectively connected with a condenser B in the heat pump B and a condenser C in the heat pump C; and an evaporator C in the heat pump C is connected with the buried pipe A to form a closed liquid circulation pipeline. The outstanding effect that the flow ratio of clear water to waste water is larger than or equal to 1: 1 can be achieved without other hot water equipment all the year round, bathing hot water can be prepared from bathing waste water, and all domestic hot water needed for vegetable washing, hand washing and face washing in kitchens and toilets can also be prepared; by switching the working modes, the first barrel of hot water can be prepared without other auxiliary heating equipment such as electricity or an air source, so that the whole system can operate.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency building energy conservation, and in particular relates to a ground source-assisted waste heat cascade utilization water source heat pump hot water system. Background technique [0002] The applicant has previously submitted patents with application numbers of 201910362566.1 and 2018102542474, which use 14% electric energy to drive 86% of the waste heat from bathing to be recycled and reused, not only to recover the full amount of waste heat in the bathing wastewater, but also to reduce the inlet temperature of clean water to 3°C. The waste heat is over-recovered, and the utilization rate of waste heat from bathing is as high as 90%. At the same time, it can automatically respond to different seasons and different working conditions, synchronize the flow of waste water and fresh water, and automatically realize the unification of hot water production capacity, COP, and maximum waste water ...

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Problems solved by technology

[0003] Simply using the system of the above patent to produce domestic hot water from bathing wastewater, when the tap water temperature is extremely low in severe cold winter, even if the heat in the bathing wastewater is recovered to the maximum extent, it cannot meet the demand for domestic hot water temperature rise, and auxiliary heating must be used Although the auxiliary heating accounts for a small proportion of the total heating, it still brings more inconvenience to the overall operation and will significantly reduce the performance coefficient of the system.

For example, electric auxiliary heating will seriously increase the overall operating energy consumption of the equipment, and an additional set of electric auxiliary heating equipment is required for operation and maintenance, which increases additional costs; ordinary ground source heat pump systems require a large number of buried pipes during construction , and the buried pipe must be kept at a sufficient distance, so the overall floor area is large, and the site conditions are not easy to meet. In actual operation, due to the low temperature of the ground source, the system performance coefficient is not high, and it is also prone to ground source heat. Unbalanced situation, cannot guarantee long-term operation

The air source heat pump cannot be used normally in severe working conditions such as cold winter and continuous rainy and snowy days

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