Air-conditioning cold water variable flow system and its control method

Abstract

The invention discloses an air conditioner cold water variable-flow system which comprises cold water unit systems and water supply loop systems. Each cold water unit system comprises a cold water unit, each water supply loop system comprises a water supply pipeline and a water return pipeline, a water supply main pipe is arranged between a water outlet of each cold water unit system and the corresponding water supply pipeline, and a water return main pipe is arranged between a water inlet of the cold water unit system and the corresponding water return pipeline. Water pump systems are arranged on the water supply pipelines or the water return pipelines, a communication bypass is arranged between the water supply pipeline and the water return pipeline of at least one water supply loop system, an automatic bypass valve is arranged on the communication bypass, a pressure difference sensor I is arranged between a water inlet and a water outlet of at least one cold water unit, or a flow sensor is arranged on a water inlet or a water outlet of at least one cold water unit, and a bypass valve control system is arranged between the pressure difference sensor I and the automatic bypass valve or between the flow sensor and the automatic bypass valve. The invention further discloses a control method of the air conditioner cold water variable-flow system.

Description

technical field [0001] The invention belongs to the technical field of central air-conditioning, and in particular relates to an air-conditioning cold water variable flow system and a control method thereof. Background technique [0002] At present, large-scale central air-conditioning cold water systems generally use a primary pump variable flow system and a secondary pump variable flow system to adjust the flow. [0003] Such as figure 1 Shown is a water flow diagram of an existing one-stage pump variable flow system. The primary pump variable flow system includes a water chiller system, a primary pump set and a water supply circuit arranged in parallel. The chiller system includes multiple chillers 1, the water supply circuit includes a water supply pipeline 2 and a return water pipeline 3, and the primary pump set It includes a plurality of water pumps 4 arranged in parallel. The outlet pipe of the chiller system is connected to the inlet pipe of the first-level pump ...

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Problems solved by technology

[0006] The primary water pump 9 of the secondary pump variable flow system is used to overcome the water resistance in the refrigeration station, and the secondary water pump 10 is used to overcome the water resistance of the external pipe network of the refrigeration station and various user loops, although it can be achieved to a certain extent On-demand supply to users, and greatly improved the waste of water pump energy consumption, but due to its complex process, it leads to the defects of large number of equipment, complicated control, high cost and large floor area, and it is matched with it The amount of power distribution facilities and civil works is also large

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