Central air-conditioning system and control method thereof

Abstract

The invention discloses a central air-conditioning system and a control method thereof. The central air-conditioning system is characterized in that regional flow balancing valves used for controlling flow of return branch pipes are arranged on the return branch pipes, and energy balancing valves are arranged on return pipes of tail-end fan coilers. The control method of the central air-conditioning system includes: detecting flow in the return branch pipes, adjusting the flow in the return branch pipes to be smaller than or equal to the set flow value of the return branch pipes, detecting the temperature of return water in the return pipes of the tail-end fan coiler, controlling the temperature of the return water in the return pipes of the tail-end fan coiler to be larger than or equal to the set temperature value of the tail-end return water, detecting the room temperature and adjusting openness of the energy balancing valves in a temperature controller. The central air-conditioning system has the advantages that the problem of unevenness of heat caused by static and dynamic imbalance is solved, the central air-conditioning system is more stable, design work quantity is reduced, balance adjustment is more convenient, energy consumption is low and comfortableness is high.

Description

technical field [0001] The invention relates to a central air-conditioning system balance control technology, in particular to a HVAC system water balance control technology. Background technique [0002] The main purpose of setting up a central air-conditioning system is to obtain a comfortable indoor environment. Common central air-conditioning systems mostly use different programs to distribute and distribute circulating water pipelines. The following problems often occur during use: 1. It cannot always be installed in all The required temperature is obtained in the end room, especially when the local end heat load changes, it cannot be adjusted to the required temperature in time; 2. Even if the cooling or heat output device has sufficient capacity, the system still There will be uneven heating and cooling; 3. When the room temperature reaches the required value, the output at the end will continue to oscillate; 4. Water hammer sounds often appear in rooms near the main ...

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Problems solved by technology

[0002] The main purpose of setting up a central air-conditioning system is to obtain a comfortable indoor environment. Common central air-conditioning systems mostly use different programs to distribute and distribute circulating water pipelines. The following problems often occur during use: 1. It cannot always be installed in all The required temperature is obtained in the end room, especially when the local end heat load changes, it cannot be adjusted to the required temperature in time; 2. Even if the cooling or heat output device has sufficient capacity, the system still There will be uneven heating and cooling; 3. When the room temperature reaches the required value, the output at the end will continue to oscillate; 4. Water hammer sounds often appear in rooms near the main water supply pipe; 5. Sometimes there will be excessive noise in the room. cold or annoying draft sensation

[0008] When a flow balance valve is installed at the end of the system, the setting value of the valve control is selected according to the design load of the end unit, that is, the maximum flow of the flow balance valve is the flow rate of the end unit under the maximum design load condition. In actual use, the flow balance valve mainly plays the role of flow limitation. Once the load demand of the terminal unit exceeds the original design maximum load, it is impossible to increase the refrigerant flow through the terminal unit, resulting in a decrease in comfort, which cannot be realized. Allocation of energy in an area

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