In winter, due to the low ambient temperature of urban sewage in cold northern areas, the temperature of raw water entering the sewage treatment plant is ≤12°C. Biochemical treatment of sewage mainly involves biochemical reactions of biological bacteria in anaerobic tanks and aerobic tanks. However, biological bacteria are in a dormant state and have poor activity when the water temperature is lower than 10°C. The biochemical reaction of sewage treatment has almost stagnated, and the treated water ammonia, nitrogen, phosphorus, COD, etc. seriously do not meet the standards. After sewage treatment reaches the standard, the sensible heat and phase change heat of less than 6°C water are used to extract heat, and the raw sewage water is heated to 12-30°C, which is suitable for strong biological bacteria activity. The sewage treatment system operates normally.

The sewage source heat pump system uses reclaimed water after sewage treatment as the heat source. It collects low-grade heat energy from the reclaimed water in winter. With the help of the heat pump system, by consuming part of the electric energy, the obtained energy is supplied to indoor heating and heating of raw sewage water. In summer, the The heat in the room is taken out and released into the water to achieve the purpose of air conditioning in summer. It has the following characteristics:

 

In winter, the water temperature is higher than the ambient air temperature, so the evaporation temperature of the heat pump cycle increases and the energy efficiency ratio also increases. In summer, the water temperature is lower than the ambient air temperature, so the condensation temperature of refrigeration is reduced, making the cooling effect better than that of air-cooled and cooling tower types, and the unit efficiency is improved.

The sewage source heat pump system operates stably. The temperature of the water body is relatively stable throughout the year, and its fluctuation range is much smaller than the fluctuation of the air. It is a good heat pump heat source. The relatively constant temperature of the water body makes the operation of the heat pump system more reliable and stable, and also ensures the efficiency and economy of the system. There are no difficult problems such as winter defrosting of air source heat pumps.

One machine for multiple purposes

This heat pump system can be used for heating and air conditioning, and is multi-purpose. One system can replace the original two devices or systems of furnace and air conditioning. The urban sewage source heat pump system uses urban sewage to obtain heat for heating in winter, exhaust heat for cooling in summer, and obtain heat to supply domestic hot water throughout the year. During the summer air-conditioning season, heat recovery can be implemented to provide free domestic hot water during partial cooling. One system can be used in both winter and summer to achieve triple power supply

The sewage source heat pump system transfers the sewage heat energy into the room together with the heat energy generated by the heat pump unit itself. The energy efficiency ratio is as high as 4.5-6.0, and the energy utilization rate is 6-8 times that of electric heating. Compared with air source heat pumps, sewage source heat pumps have lower condensation temperatures in summer and higher evaporation temperatures in winter. The energy efficiency ratio and performance coefficient are greatly improved, and the operating conditions are stable, saving 30% to 40% of operating costs compared with traditional central air conditioners.

The sewage source heat pump system does not require a cooling tower and uses urban raw sewage or reclaimed water, saving a large amount of water resources.

The sewage source heat pump system can save the cost of drilling wells and does not require the power required for water pumping and recharge. It can also avoid the problem of water resource damage caused by recharge.

The sewage source heat pump system does not require a boiler, has no combustion process, does not have solid waste, toxic and harmful gases and smoke emission problems, and is an environmentally friendly heat pump air conditioner.

Low-temperature sewage source/river water source heat pump heating is efficient and clean heating, is not subject to power cuts, and saves CO2 emissions. It can increase income through indicator market transactions.