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Sewage source heat pump system works and features advantages
Sewage source heat pump system using sewage (domestic wastewater, industrial warm water, industrial equipment, cooling water, waste water production process emissions), with the refrigeration cycle system, through the consumption of a small amount of electricity in the winter water resources in the low-quality energy "to learn" Out, through the network to provide indoor air conditioning, heating systems, domestic hot water system; summer, the indoor heat away and released into the water, in order to achieve the effect of summer air conditioning. Sewage source heat pump system features and advantages: In northern China, winter heating is mainly rely on coal, oil, natural gas and other petrochemical fuels to obtain combustion. Heating and environmental protection become a pair of difficult to solve the contradiction. Urban sewage is rare in the northern cold heat pump heat source. Its temperature is relatively stable throughout the year, winter than the ambient air temperature is higher than the ambient air temperature in summer, this temperature characteristics make the sewage source heat pump system is more efficient than the traditional air-conditioning system, energy saving and cost savings significant effect. The primary sewage source heat pump system takes the primary sewage as the heat source and collects the low grade heat energy from sewage in the winter. By means of the heat pump system, the obtained energy is supplied to the room for heating by taking part of the electric energy; in summer, the indoor heat is taken out and released into the water, To achieve the purpose of summer air conditioning. It has the following characteristics: 1. Significant environmental benefits Primary sewage source heat pump system is the use of the primary sewage as a source of heat and energy, energy conversion heating and air conditioning system, the sewage left after the heat exchange equipment or heat back to the sewage canal, Sewage and other equipment or systems do not touch, closed water cycle, do not pollute the environment and other equipment or water systems. When heating, the boiler room system of coal, gas, fuel and the like is eliminated, there is no combustion process, and pollution of the exhaust smoke is avoided; the cooling water tower is omitted when cooling, which avoids the noise and mold pollution of the cooling tower. No waste, waste water, waste gas and smoke are generated, and environmental benefits are remarkable. China's annual sewage discharge of 46.4 billion m, can save 33 million tons of coal consumption, the national annual total energy consumption of 3 billion tons of standard coal calculated to reach 1.1%, if the primary energy consumption by HVAC 10 Billion tons of standard coal calculation, up 3.3%. At the same time, it can reduce emissions by up to 720,000 tons annually. 2, energy-efficient In winter, the temperature of the sewage body is higher than the ambient air temperature, so the evaporation temperature of the heat pump cycle increases, and the energy efficiency ratio also increases. The summer water temperature is lower than the ambient air temperature, so the cooling condensation temperature decreases, making the cooling effect is better than the air-cooled and cooling towers, unit efficiency. 3. Wastewater source parameters (1) Sewage water quality problems Urban sewage includes industrial wastewater, industrial cooling water and domestic sewage, while urban secondary sewage is through a physical and secondary biochemical treatment to remove large amounts of impurities in sewage and reduce the Sewage corrosion, more conducive to the extraction of heat in sewage. (2) Sewage water temperature protection The city fits warm and cool in summer, with annual temperature stable. The water temperature of sewage is 15--20 degrees higher than the ambient temperature in winter and 10--15 degrees lower than the ambient temperature in summer. Therefore, the heat pump has a good heat source, sewage source heat pump system to use the temperature difference of 5 degrees, so the sewage source heat pump air conditioning system can run at high efficiency. (3) Sewage volume guarantee The change of urban sewage water volume is mainly the change of domestic sewage, but the domestic sewage effluent quantity basically remains unchanged. (4) Sewage heat exchanger: Sewage contains a lot of oily dirt. When it flows through the heat exchange tube, it will hang up and close the sticky sludge, thus increasing the heat transfer resistance and affecting the heat exchange efficiency. Therefore, When the heat exchanger makes the sewage run away, meanwhile, an automatic anti-cleaning device is set up, and the backwashing is regularly performed during the operation of the heat exchanger to ensure the heat exchange efficiency and improve the heat utilization rate. 4. Comprehensive analysis (1) Stable operation of sewage source heat pump system The temperature of water body is relatively stable throughout the year, and its fluctuation range is far less than that of air. It is a good source of heat pump and air conditioner. The temperature of water body is relatively constant , Making the heat pump system operation more reliable and stable, but also ensure the system's efficiency and economy. There is no air source heat pump in winter defrost and other difficult issues. (2) a multi-purpose This heat pump system can be heating, air conditioning, a multi-purpose machine, a system that can replace the original boiler plus air conditioning two sets of devices or systems. Urban sewage source heat pump system using urban sewage, heating heating in winter, summer heat cooling, heat supply year-round hot water supply, the summer air-conditioning season can be implemented part of the free domestic hot water supply. A system of summer and winter, to achieve triple for. (3) Energy-saving sewage source heat pump system will be sewage heat energy together with the heat pump unit itself generates heat transfer to the indoor, energy efficiency up to 4.5-6.0, energy efficiency is 3-4 times that of electric heating, sewage source heat pump and air source heat pump In contrast, the summer condensing temperature is low, the winter evaporation temperature is high, the energy efficiency ratio and coefficient of performance greatly improved, and stable operating conditions, than the traditional central air-conditioning savings of 30% -40% operating costs. (4) Water-saving sewage source heat pump system without the need for cooling towers, the use of urban primary sewage, saving a lot of water resources. (5) Operation of safe sewage source heat pump system can save drilling costs, but also do not need pumping and recharging the required power, but also to avoid the damage caused by water recharge problems. (6) Significant environmental protection The sewage source heat pump system does not require a boiler, and there is no combustion process. There is no solid waste, toxic or harmful gases and soot emissions. It is an environmentally friendly central air conditioner.