Energy-saving heating and air-conditioning systems is one of the most important components of building energy efficiency. Balance valve is heating, air conditioning hot, cold water system, one of the key energy-saving equipment. First, the balance valve is the key water-saving system 1, the balance valve is air-conditioning, heating and cooling, hot water system imbalance, thermal imbalance nemesis, is the realization of cold, hot water system, the key balance of hydraulic devices. 2, balance valve is an important heating and air conditioning system billing an indispensable important equipment. Because, only the first solution to the problem of uneven distribution of traffic, can achieve thermal measurement. 3, the balance valve is the air conditioner, heating system equipment, pipe network and pump characteristic curve, the work point to achieve a good match key. So that all kinds of equipment, water pumps to achieve energy-saving operation, so that air conditioning, heating system has become an energy-saving system. 4, balance valve is to ensure that air-conditioning, heating system, safe and reliable operation of important equipment for all users to create a comfortable indoor thermal environment, so that all users are satisfied with the key. The actual operation of thousands of projects also proved that the balance valve is air-conditioning, heating system to improve energy efficiency, reduce energy consumption and reduce project cost to ensure safe and reliable operation, so that the user satisfaction system indispensable one of the important equipment Second, the user Satisfaction, so that the balance valve has a vast market Air conditioner invented and manufactured the first balance valve in China, developed and developed a hydraulic system to solve the hydraulic imbalance of hardware - balance valve and software - dedicated intelligent instrumentation; declaration and access to China The first balance valve patents, and was named the Chinese Patent Award for Excellence in Inventions, won the Ministry of Construction, the State Science and Technology Commission for Science and Technology Progress Award and the promotion of scientific and technological achievements Award. Several times been included in Beijing, the Ministry of Construction and the State Science and Technology Commission to promote major scientific and technological achievements. And by the state as a national new product. Since 1989, the production of series balance valve products, air-conditioning Beijing IKON Environmental Technology Development Company has been committed to improving the technological content of products. Has developed a better performance, look more beautiful, lighter weight, easier to adjust the third generation of products. Ten years, the balance valve has been sold for several million units, the application is located in the country's 30 provinces and autonomous regions more than 2,400 projects. Most of the application units have been more obvious energy efficiency, economic and social benefits, has been the relevant ministries, local governments, design departments, thermal companies, real estate companies, property management companies and users welcome. Therefore, the use of the development of faster and wider. ①. Increasingly Wide Range of Applications From mega-cities, large and medium-sized cities to small cities and small towns, according to incomplete statistics, about 70 cities in the Three North Region have used balance valves. From the heat company, residential quarters to the institutions of tertiary institutions and various types of plant. According to incomplete statistics, about 20 million m2 thermal company, residential area of ​​about 10 million m2 using the balance valve. From heating, heating to air-conditioning systems, the current South to Haikou, Harbin, north to about 100 air-conditioning works using a balance valve. ② The relevant government departments and municipal governments pay more and more attention. The use of balanced valve heating, air conditioning system can be safe and reliable to ensure that users meet the indoor requirements, room temperature compliance rate, a substantial reduction in user complaints, social benefits are very good, won the welcome of all levels of government. ③ heat companies, property management companies more and more active. After the balance valve is adopted, the thermal power company and the property management company realize the energy-saving operation, reduce the heat consumption and electricity consumption, enlarge the heating area, and make the whole system of heat source, heat network and heat station become the energy-saving system. Therefore, they are more and more actively using the balance valve. ④ Design units are more and more interested. Check the quality of the design standards is the use of results. In the entire system, balance valve occupies little investment, but the role is great. Therefore, the design unit is very interested in their inclusion in the design standards, procedures, the design requirements of the balance valve. Third, the engineering application of the balance valve to verify the contribution of energy-saving heating system 15,800 m2 heating area of ​​Langfang Heating Company, 600,000 m2 heating area of ​​the stone Buddha camp, 20 tens of thousands of m2 of Xi'an Huanghe Instrument Factory, more than 100 Million m2 of space carrier rocket research institute compound, more than 20 million m2 of the General Staff of the three organs of the compound and other heating system has the following characteristics: ①heating area, heat source and thermal households direct connection. ② .Hydraulic imbalance, thermal imbalance is very serious, near-end user room temperature is high (some indoor up to 28 ~ 29 ℃), remote user room temperature is low (some less than 10 ℃), room temperature compliance rate is low, the user complaint rate. ③ due to the loss of resistance of the proximal user is small, the pressure drop near the parallel pipeline, water supply from the proximal short circuit back to the heat source plant or heat station, resulting in the illusion of backwater temperature is too high, increasing system power consumption, waste Thermal energy. ④ due to some users at low temperature, the use of increased heating operation, so that 1 ton / h boiler output can only heat 2000m2 ~ 5000m2; increase the circulating pump, reducing the water transfer coefficient, increased power consumption or increase relay Pump, increase the power consumption, make the hydraulic imbalance more serious. Balance valve is the scope of the control valve, it works by changing the valve core and seat gap (ie, opening), change the flow resistance through the valve to achieve the purpose of regulating the flow. Counterbalance valve larger resistance coefficient, the ability to absorb the remaining head pressure higher. When it is installed in the branch pipe and the user's entrance, through the opening adjustment, increase the proximal pressure drop (that is, the absorption of the proximal residual head), you can make the proximal flow to the design value, but also to the water flow to the end, Remote, to achieve a hydraulic balance. For users, room temperature compliance rate increased; for property management companies, raising the water transport coefficient, an increase of 1 ton / hour boiler output heating area. These users use the balance valve, energy saving, saving up to 15% or more. 2. Baoji Thermal Power Co., Ltd., Park in the Capital Park, Three of the General Staff, and the 13 # Thermal Power Station in the Nanxiaoying Heating Plant are all running modes with large flow rate and small temperature difference. Most of the circulating water pumps are of large flow rate , High shaft power pump. In actual operation, the operating point deviates from the pump design work point, the pump efficiency is reduced, the shaft power is increased, and the power consumption is increased. Analysis of an example: a system without design calculations, the first flow (design flow) 272 m 3 / hour, head 33 m water pump (the impeller diameter D? 1 = 280 millimeters), Figure 1, A is Design of the pump working point. However, in actual operation, due to the high calculation resistance, the operation moved to point B (flow 318 m 3 / h, head 29.7 m water column). From point A to point B, the pump efficiency is reduced and the power is increased from 30.35 kilowatts to 32.66 kilowatts. If the system adjusts the pipe resistance by using a balancing valve (such as a balance valve after the manifold), the pump operating point returns to point A, This will reduce the pump power (32.66-30.35) /30.35=7.6%. However, in order to save more energy, you should replace the small pump. Specific practices are as follows: To help balance valve can be obtained when it is fully open work point, that B, 318 meters 3 / hour flow. According to the constant speed of the pump, the relationship between the impeller diameter D and the flow rate Q D 1 1 / d 2 2 = Q 1 1 / Q 2 2, we can find the appropriate pump impeller diameter, that is D 2 2 = D 1 1 1 / Q 2) = 28 0 × (272/318) = 239 mm, take D 2 = 240 mm (ie 9-1 / 2 "). After replacing the pump of the appropriate type, Can get the operating point C. At this point the pump power down to 22.37 kilowatts. Compared with the B point, the pump power down (32. 66-22.37) /31.66=31.5%. After the installation of balancing valve, the company Baoji Thermal Power, South Camp # 13 # Heating station is running, have reduced a circulating pump.It is recommended Park name selection residential district lower circulating pump. 3. Most of the balance valve heating project is basically due to uneven room temperature, many users room temperature Figure 2 is the heating system when the system imbalance in water temperature at room temperature distribution curve.The abscissa is room temperature, the ordinate indicates a room temperature room percentage of the total room.A curve A is the room temperature distribution curve of hydraulic disorders, Only a small part of the room temperature required for the temperature of 18 ℃, most of the room temperature far more than 18 ℃, then all room average room Is 20 ° C. The room temperature requirement for most rooms in a hydraulically balanced system (curve B) is 18 ° C. For a heating cell, the average room temperature in the heated floor area drops from 20 ° C. to 18 ° C. Not only is the significant Reduce the heat supply, at the same time greatly improve the quality of heating.For air-conditioning system, the situation and heating are similar, in general, the heating system to reduce the average temperature of 1 ℃ can be 5-10% energy saving .Air conditioning system for each increase of 1 ℃ average temperature Energy-saving 10 ~ 20% Heating system to achieve balance, often can reduce the average room temperature 1-3 ℃, and air-conditioning system can increase 1-2 ℃, so that the system balance, the amount of heat (cold), energy saving 5-30%.