Energy saving measures for heating and air conditioning systems

From the perspective of China's current heating and air-conditioning system, the total power consumption of compressors, such as fans and pumps, is very large, accounting for about one-third of the total industrial electricity consumption. The chain occupies a large proportion in the national economy and has a very large space for energy conservation.

Nowadays, the civil heating and environmental protection air-conditioning system has problems such as large electric power capacity and high operating power consumption. The power consumption of the water pump accounts for a large proportion of the total power consumption of the air-conditioning heating system. If the design of the pump has a large electric power capacity, it is necessary to increase the power generation amount and increase the peak-to-valley difference. If the power consumption is large, the coal consumption for power generation will also increase, and the pollution emissions will increase. Capacity increases, investment costs It also increases, and the power consumption is large, which increases the electricity bill. These reasons all increase the cost of the air-conditioning heating system, which brings great economic burden to the residents and is not conducive to the sustainable development of the enterprise. Intensive development. Therefore, it is necessary to find out the root cause of the large energy consumption of the air-conditioning heating system, and find feasible energy-saving measures according to the energy consumption.

1. The reason why the air conditioning heating system consumes more energy

1.1 Design pump power is relatively large


As can be seen from the power of the pump shaft, the main factors affecting the pump power are flow, lift and pump efficiency. The design of the hot and cold load is too high, causing the water flow to be too large, the unreasonable cold heat preset and the supply and return water temperature difference, resulting in a large load base, increasing the investment cost of the pump, reducing the pump operating efficiency, resulting in higher flow rate. Actual demand and usage, wasted energy; the choice of the head is too high, resulting in an increase in the pump's electrical capacity, higher than the measured cooling water

The pump head causes the consumption of the throttle valve to increase; in actual operation, the pump often deviates from the high efficiency point, resulting in the pump running efficiency is low, and the expected energy saving effect is not achieved.

1.2 Pump operation consumes a large amount of electricity

The power of the pump shaft and the delay of the running period are the main factors affecting the power consumption of the pump. The flow, head and operating efficiency of the pump directly affect the power of the shaft. First of all, in order to solve the problem of uneven heat and heat caused by the fault of the hot water network, many heating systems adopt a large flow and small temperature difference operation mode. This operation mode leads to excessive flow and increases the operating power of the pump. .

Secondly, the flow rate and head of the pump are too large, and the power consumed is increased, so that the pump is operated in a low-efficiency zone, which increases the inefficient operation and ineffective energy consumption.

Thirdly, in order to adapt to the load change, the valve is used to adjust the flow rate, and the power consumption of the water pump is reduced by the adjustment of the water quantity. However, due to the increase of the operating pressure of the water pump, useless operation is generated, resulting in inefficient energy consumption.

Fourth, the parallel operation mode of one machine to one pump is a commonly used operation mode in the heating air conditioning system. When operating in parallel, the flow rate and power consumption are correspondingly increased, and the resistance of the pipe network is correspondingly increased, and the pump is increased. Running burden.

2. Energy-saving measures for air-conditioning heating systems

The energy consumption of the air conditioning heating system is mainly due to the design, operation and the pump itself. Therefore, in order to improve the operating efficiency and energy saving of the air conditioning heating system, it is necessary to preset, operate and improve the pump efficiency. To improve.

2.1 Designing a reasonable water transport coefficient

The water transport coefficient refers to the heat supply from the unit power consumption of the circulating water pump. According to the precise calculation, the reasonable water transport coefficient is determined, so that the pump matching the coefficient is selected, and the premise work of the air conditioning heating system is well done.

2.2 Use of frequency conversion technology

Compared with the traditional method of adjusting the performance of the pump, the application of the frequency converter has better advantages and effects. With the continuous development of technologies and means such as power electronics technology, microelectronic technology, and information control, the frequency conversion speed regulation technology with AC speed control center has been widely used. The frequency conversion technology has the characteristics of energy saving and environmental protection, large speed regulation range, easy to realize forward and reverse switching, small starting current, simple structure and safe and reliable operation.

With the improvement of the technical level, the AC motor and the variable frequency speed control device in the variable frequency speed control system are also continuously improved. Through the research of the high-efficiency running motor such as the asynchronous motor for frequency conversion and speed regulation, the motor is continuously adapted to the driving device. Effectively increase the power of the motor to achieve the effect of reducing energy consumption. The use of new electronic technology and information technology to continuously improve the function and performance of the inverter is the development direction of the modern air conditioning heating system to effectively regulate the performance of the pump.

.3 pay attention to the dual operation of economic and energy saving of air conditioning heating system

Heating and air-conditioning enterprises can not only focus on economic benefits, but also pay attention to energy conservation and environmental protection in the trend and requirements of social development, and attach equal importance to energy conservation and economic efficiency development to promote sustainable development of enterprises. In terms of technology, it is necessary to optimize the unit equipment for the air conditioning heating system, select the AC motor and pump model that meet the coefficient requirements, and set up the pipe network that meets the system operation requirements. In terms of economic operation management, it is necessary to grasp the working conditions related to the operation of the system, master the economic operation status of the system's pipeline network; install the flow meter and pressure flow meter according to the pump unit and pipe network, monitor the operation of the system; establish operation Log record and equipment technical record system; establish system operation operation specifications, accident treatment prevention program, electricity evaluation system, inspection and maintenance system, etc., effectively provide a solid working foundation for enterprise energy conservation.

2.4 Choose a pump with good performance

The high performance of the pump is characterized by its high efficiency, durability and low maintenance. Pump investment accounts for a large proportion of building air conditioning systems. Pump electric power also accounts for a large proportion of total air conditioning power. Pump delivery systems consume a lot of energy. Therefore, selecting high-performance pumps can effectively reduce operating power consumption and improve operating efficiency. . The energy-saving work of air-conditioning heating system involves design, construction, operation and many other aspects. Air-conditioning heating enterprises should pay attention to the important role of energy-saving work for enterprises to save resource costs and improve enterprise income, and continuously introduce new technologies to improve the unit. Energy efficiency and performance enable companies to grow healthily in a sustainable direction.

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