Cold volume governing system for regionally concentrated cold supply second-stage cold volume exchange station

Abstract

The present invention provides cold volume governing system for regionally concentrated cold supply second-stage cold volume exchange station, including a second-stage cold volume exchange station controller and a remote, local supervisory computer respectively connecting to the converter. The second-stage cold volume exchange station controller is connected with a cold architecture cold-supplying pipe net supply water temperature sensor, a return water temperature sensor, a frequency conversion cycle water pump, a backwater-supplying differential pressure transducer and an outdoor environment humiture sensor through the analog quantity input module, and connected with the cold architecture cold-supplying pipe net frequency conversion cycle water pump through the digital quantity input module, an analog quantity, a digital quantity output module, also connected with the second-stage cold volume exchange station plate exchanger secondary side backwater flow control valve and the by-pass control valve through the analog quantity input, the output module. The invention can greatly advance the cold architecture freeze supply water temperature and the second-stage cold volume exchange station plate exchanger secondary side backwater temperature, which has good energy saving effect and good popularizing applied cost.

Description

technical field [0001] The invention relates to a central air-conditioning energy-saving control technology, in particular to a cooling capacity adjustment system and an adjustment method of a secondary cooling capacity exchange station for regional centralized cooling. Background technique [0002] Due to its advantages of high energy efficiency, low environmental heat pollution, effective reduction of equipment capacity and reduction of machine room floor space, regional centralized cooling is being rapidly promoted and used worldwide, and has become an important aspect of the development of modern air conditioning. However, in the current regional centralized cooling system, there are still the following management and technical problems in the cooling capacity adjustment of the secondary cooling capacity exchange station, which prevents the various advantages of the regional centralized cooling system from being fully utilized and better reflected: [0003] (1) It is dif...

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Problems solved by technology

However, in the current regional centralized cooling system, there are still the following management and technical problems in the cooling capacity adjustment of the secondary cooling capacity exchange station, which prevents the various advantages of the regional centralized cooling system from being fully utilized and better reflected:

[0003] (1) It is difficult for the user unit to adjust the cooling capacity as a whole: At present, the equipment of the secondary cooling capacity exchange station for regional centralized cooling is owned and managed by two different units, and the plate heat exchanger of the secondary cooling capacity exchange station is once The side equipment and the outlet water temperature of the secondary side are under the management and control of the district cooling operation unit, and the secondary side equipment of the plate heat exchanger at the secondary cooling exchange station is under the management and control of the user unit. The user unit has no right to control the primary side of the plate heat exchanger. The water flow is regulated, and the temperature of the refrigerated water supply for cold buildings cannot be adjusted;

[0004] (2) When there is no well-equipped building automatic control system in the cooling buildings for regional centralized cooling, it is difficult for equipment managers to adjust the operating parameters of terminal air-conditioning equipment according to changes in outdoor temperature and humidity and internal cooling load (for example, the country began to advocate summer cooling in 2005). The indoor temperature must not be lower than 26°C, but most cooling buildings cannot meet this requirement due to the lack of scientific and reasonable control means for the terminal equipment), in this case, due to the secondary side of the plate heat exchanger of the secondary cooling exchange station The temperature is controlled by the district cooling operation unit according to the constant temperature water supply. The water supply temperature usually adopts the design parameters of the cooling building air conditioner (that is, the water supply temperature of 7°C). As a result, the indoor temperature and humidity are often too low inside the cooling building, resulting in a lot of waste of cooling capacity. ;

[0005] (3) When the cooling load of the air-conditioning equipment at the end of the cooling building is lower than the design load, since the secondary side of the plate heat exchanger of the secondary cooling capacity exchange station adopts constant temperature water supply, and the cooling water supply flow of the cooling building is due to the hydraulic balance of the pipe network and When factors such as the minimum pressure difference between supply and return water are limited and cannot be adjusted proportionally with the change of cooling load, the temperature difference between supply and return water often decreases, which is commonly referred to as the phenomenon of "large flow rate and small temperature difference". The temperature of the water decreases, which in turn reduces the temperature of the outlet water at the primary side and the temperature difference between the inlet and outlet water. The regional centralized cooling pipe network cannot achieve a large temperature difference (generally designed to be around 10°C) and small flow water supply, resulting in energy consumption of the cooling pipe network water pumps. Increase, the loss in the process of cold delivery increases

[0006] (4) Under dry climate conditions, due to the low temperature of the water supplied by the cold building cooling pipe network, the indoor ambient humidity is too low, and the latent heat energy consumption of the central air conditioning system increases

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