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Analysis of Energy Saving Control Characteristics of Central Air Conditioning System

Release time:

2023-11-21

The energy consumption of air conditioning system accounts for more than half of the overall energy consumption of the building, and the energy saving of the air conditioning system is very important for the carbon neutrality of the building.

Another common central air-conditioning system generally includes several major energy-consuming components such as chillers, cooling towers, cold water pumps and cooling water pumps. At present, with the continuous progress of refrigeration technology, the efficiency of chillers is constantly improving, especially with energy recovery and the wide application of magnetic levitation chillers, which effectively reduces the overall energy consumption of chillers. However, with the reduction of energy consumption of chillers, the proportion of energy consumption of cooling towers and pumps is constantly increasing.

How to solve the energy-saving problem of the current air-conditioning system, the main contradiction has been transformed into the operation cooperation between various sub-devices and the efficient linkage between other systems. At this point, we must have a deep understanding of the operating characteristics of the air conditioning system and the theoretical starting point of energy-saving control. Based on many practical cases of the smart energy-saving scheme of the bank, we have roughly sorted out the following five points for the characteristics of the energy-saving control of the central air conditioner, hoping to be helpful to everyone.

1. interference factors

During the operation of the central air conditioning system, it will be affected by the outside temperature and solar radiation factors, as well as the indoor equipment. These factors cause the central air conditioning system to reduce the operating efficiency, can not achieve the desired operating results.

2. control effect is affected by the moderating object

In the case of central air conditioning is disturbed, the controlled quantity will change with time. In order to avoid the influence of external interference factors, the central air-conditioning energy-saving automatic control system will automatically control the indoor temperature, humidity and air quality during the operation. However, the final control effect does not depend on the automatic control system of the central air conditioner, but mainly depends on the characteristics of the controlled object (regulation object) and the rationality of the system operation.

3. temperature and humidity are correlated

Air conditioning energy-saving control system is mainly to control the indoor air temperature, humidity, in the same adjustment object, at the same time to adjust the two controlled quantity. The two main parameters of the air state, temperature and humidity, are not completely independent of the two variables, and there is an interaction between the two variables in the process of regulation. When the relative humidity changes, if the humidifier or surface cooler is turned on for humidification or dehumidification, the indoor temperature will fluctuate; when the indoor temperature changes, the pressure of saturated water vapor molecules in the indoor air will change, and the absolute moisture content will change Under the same condition, the relative humidity of indoor air changes. In other words, under the action of central air conditioning, when the indoor temperature rises, the humidity will decrease, and when the indoor temperature decreases, the humidity will increase. In addition, in the central air conditioning adjustment process, if a parameter changes, another parameter will change accordingly. For example, in the summer, through the surface cooler for dampness treatment, open the large cold water valve, can make the humidity control in the standard range. If the central air conditioner does not carry out the air supply heat treatment, the air supply temperature is low, which will have a certain impact on the air humidity.

Multi-condition operation and conversion control of 4.

In the actual operation process, the central air conditioning system can automatically adjust according to the indoor environment. In the case of changes in indoor conditions, the central air conditioning system operating state can be automatically transformed. At the same time, due to the diversity of air conditioning operation state, air conditioning operation management and automatic control equipment tend to be complex.

5. overall control

In the actual operation of the central air-conditioning automatic control system, the internal temperature and humidity control of the air conditioner is generally the core, and the air treatment is realized through operation conversion. During the operation of the air conditioning system, relevant operations are implemented according to the working procedures to control the indoor temperature and humidity. During the operation of the system, if a device fails, it will have a serious impact on the operation and energy-saving control of the central air-conditioning, and the control effect of indoor temperature and humidity will also have a great impact, and even cause the system to automatically shut down.

After we fully understand the operating characteristics of the air-conditioning energy-saving control system, we can achieve automatic energy-saving control by combining demand-side and load-side information. The most important thing is the intelligent switch and start-stop of the refrigerator, freezing pump, cooling pump, cooling tower fan and various related electric valves, and the operation collocation design and parameter setting of the unit can also be more reasonable.

What are the energy-saving measures for the central air-conditioning system?

Central air conditioning energy saving control system