Control method of cold water unit

A control method and technology for chillers, applied in heating and ventilation control systems, heating methods, mechanical equipment, etc., can solve the problem of uneven distribution of refrigerants, achieve uniform distribution of refrigerants, solve uneven distribution, and improve unit performance.

Pending Publication Date: 2020-04-07
QINGDAO HAIER SMART TECH R & D CO LTD
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  • Abstract
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Problems solved by technology

[0003] The invention provides a water chiller, which solves t

Method used

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  • Control method of cold water unit
  • Control method of cold water unit
  • Control method of cold water unit

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Embodiment Construction

[0036] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] Aiming at the problem of uneven distribution of refrigerant in the evaporator in the prior art, this embodiment proposes a control method for the chiller unit, which solves the above technical problems. The control method for the chiller unit will be described in detail below.

[0038] The chiller mainly includes compressor 1, condenser 2, multiple falling film evaporators, etc., see image 3 As shown; multiple falling film evaporators are connected in parallel, the liquid pipe of each falling film evaporator is connected to the liquid pipe of the condenser, and the air pipe of each falling film evaporator is respectively connected to the suction pipe of the compressor; in each A flowmeter and an electronic expansion valve are connected in series on the liquid pipe of each falling film evaporator. Each flowmeter c...

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Abstract

The invention discloses a control method of a cold water unit. A degree-of-opening adjusting proportion S is calculated according to a current superheat degree difference delta Ti and a last calculated superheat degree difference delta T(i-1); an electronic expansion valve is selected, and the degree of opening of the selected electronic expansion valve is adjusted according to the adjusting proportion S; the degrees of opening of other electronic expansion valves are adjusted, so that the refrigerant flow of a falling film type evaporator liquid pipe where the other electronic expansion valves are located is the same as that of the falling film type evaporator liquid pipe where the selected electronic expansion valve is located, the refrigerant flow in each parallel falling film type evaporator is the same, refrigerant distribution is uniform, the unit performance is improved, and the problem of uneven distribution of refrigerants in an evaporator in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a method for controlling a chiller. Background technique [0002] At present, falling film evaporators in the market have been applied in small and medium cooling capacity chillers, but it is still difficult to use falling film evaporators to replace traditional flooded evaporators for large cooling capacity chillers (such as above 1000RT). The reason is that the refrigerant distribution area of ​​the falling film evaporator with large cooling capacity is large, and the distribution device of the gas-liquid two-phase flow evaporator is difficult to evenly distribute the liquid refrigerant on the surface of the large-area heat exchange tube, resulting in heat transfer Poor performance, the performance of the unit is below the level of flooded chillers. Contents of the invention [0003] The invention provides a water chiller, which solves the problem of une...

Claims

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Application Information

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IPC IPC(8): F24F11/62F24F11/61F24F11/70F24F11/89F24F13/30
CPCF24F11/62F24F11/61F24F11/70F24F11/89F24F13/30
Inventor 路则锋
Owner QINGDAO HAIER SMART TECH R & D CO LTD
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