Method and system for deeply recycling bathing sewage waste heat of small bathing places at home or in hotel rooms and like

Abstract

The invention provides a two-stage heat recycling system. Temperature of bathing hot water in small personal bathing places at home, in hotels and the like is about 40 DEG C, the temperature after a human body is sprayed is still very high and about 35-37 DEG C, and all of the high-temperature hot water is directly discharged into sewers, so that a lot of heat is wasted. Aiming at the circumstance of the small personal bathing places at home, in hotels and the like, the two-stage heat recycling system which is characterized by direct heat exchange with taper water and in-depth recycling through a heat pump is provided, the system is composed of an integrated water tank and an integrated bathing platform, a complex system is compacted and simplified, thereby being small in occupied space and capable of being arranged in various independent bathing rooms well, and the problem that bathing space at home or in hotels is insufficient is solved. By the integration mode, product industrialization is facilitated, product mounting, using and maintaining are facilitated, and requirements on attractiveness needed for households are met.

Description

technical field [0001] The invention belongs to the field of energy technology, and relates to a method and system for recovering waste heat from bathing sewage in small bathing places such as households and hotel rooms, and in particular to a method for recovering waste heat from bathing sewage in a two-stage depth using a heat exchanger and a heat pump. It relates to a system for recovering waste heat from bathing sewage by using the method. Background technique [0002] The hot water for bathing in domestic water heaters is around 40°C. After spraying the human body, the temperature is still very high, about 35°C-37°C. The current situation is that these hot water with high temperature are directly discharged to the sewer. It is a great waste of energy. On the other hand, with the further rise of electricity and natural gas prices, residents' water consumption for bathing or gas consumption will further increase. Under normal circumstances, if this part of heat can be ef...

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Problems solved by technology

[0005] (2) The single-stage heat recovery method that directly adopts the heat pump to extract heat without first exchanging heat with low-grade tap water will greatly reduce the recovery efficiency and increase the recovery cost, such as the Chinese patent "Bath Wastewater Waste Heat Recycling Device (Chinese Republic of China, application number: 200610044652.0)", "Carbon dioxide heat pump water heater that recovers waste heat from bath water (People's Republic of China, application number: 201010564629.0)", "waste heat recovery instant heat pump water heater (People's Republic of China, application number: 200920141101.5)" ,"Air source heat pump water heater with waste heat recovery device (People's Republic of China, patent number: ZL200620024573.9)"

[0006] (3) The system may be divided into multiple water tanks, which cannot be miniaturized, or needs to build a bathing wastewater collection pool, and the installation is relatively cumbersome. It is not suitable for small and decorated bathrooms, and cannot be used in personal bathing places such as households and hotel rooms.

For example, the Chinese patent "instant heat pump energy-saving water heater (People's Republic of China, patent number: ZL200620053000.9)", but its biggest problem is that there is no starting heat source, which will bring two serious problems: 1) In the initial stage of bathing, It can only extract heat from tap water, wasting a lot of tap water, which is another kind of waste in cities where water resources are becoming more and more tense; 2) Since the discharge of bathing wastewater always lags behind bathing, and it is used for personal bathing at home or in hotels, etc. Occasionally, the time for personnel to open and close the hot water valve during the bathing process is relatively short, and the operation and control of this instant heating unit is difficult, and even the entire unit cannot operate.

[0011] Chinese patents "Shower hot air and hot water waste heat recovery heat pump water heater (People's Republic of China, application number: 201320102848.6)" and "Waste heat recovery dual-source heat pump water heater system (People's Republic of China, application number: 201110239271.9)" have announced a use The heat pump principle is a method of extracting heat from bathing wastewater and air, but this method is also not suitable for small and decorated bathrooms, and is not suitable for personal bathing places in households and hotel rooms.

[0013] To sum up, the currently disclosed heat recovery methods for bathing wastewater cannot be deeply recycled due to the small amount of recovery; or the recovery cost is high due to low recovery efficiency; or precious water resources are wasted because there is no independent start-up heat source; or the system The structure is complicated, it cannot be miniaturized, and it does not meet the limitation of installation space, so it cannot be applied to personal bathing places in households or hotel rooms

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