Condensing pressure control method for air-cooled cooling-water machines under wide temperature conditions
An air-cooled chiller, condensing pressure technology, used in compressors with multiple condensers, refrigerators, evaporators/condensers, etc., can solve problems such as condensing pressure, low pressure drop, change, and high pressure drop , to ensure smooth operation and avoid rapid changes
Active Publication Date: 2020-04-07
GUANGDONG SHENLING ENVIRONMENT SYST CO LTD
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Problems solved by technology
However, various parameters of the refrigeration system during stable operation, such as high pressure, low pressure, and condensing pressure, are stable. If one of the parameters changes suddenly, other parameters will change, which will affect the stability of the refrigeration system. For example, When the first independently adjustable condenser in the above patent is opened, due to the sudden increase of the condensation space, the high pressure of the system will drop rapidly, which in turn will cause the condensation pressure and low pressure to drop rapidly, and the speed of change is relatively fast, so that the refrigeration system The expansion valve cannot adapt to this change, and may even trigger the low-pressure protection of the expansion valve, resulting in instability of the entire refrigeration system
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[0057] The accompanying drawings of the present invention are only for illustrative purposes, and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some components in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, some known structures and their descriptions in the drawings may be omitted. understandable.
[0058] Such as figure 1 As shown, an air-cooled chiller under wide temperature conditions provided by the present invention includes a compressor 1, a pressure maintaining valve 2, a solenoid valve 3, a condensation system, a one-way valve 6, and a pressure sensor 7, which are sequentially connected into a refrigeration cycle system. , a liquid receiver 8, a dry filter 9, an expansion valve 10, and an evaporator 11. The condensing system includes a plurality of condensers 5 and a condensing fan 4 for forced convection heat...
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The invention relates to the technical field of air-cooled cooling-water machines, in particular to a condensing pressure control method for the air-cooled cooling-water machines under wide temperature conditions. With the method, the air-cooled cooling-water machines can run stably under the wide temperature conditions. The air-cooled cooling-water machine unit under the wide temperature conditions comprises a compressor, a condensing system, an expansion valve and an evaporator which are connected sequentially to form a cooling circulating system; and the condensing system comprises multiplecondensers connected in parallel and a condensing fan for forcing the condensers for heat convection heat exchange. The control method includes the following steps that S1, the running temperature condition of the air-cooled cooling-water machine unit is set; S2, the environment temperature is detected, the current running mode of the air-cooled cooling-water machine unit is judged according to the comparison result of the environment temperature and the running temperature condition, and a certain quantity of condensers are controlled to be started; and S3, the condensing pressure of the cooling circulating system is detected, and starting and stopping of the condensing fan or the starting, stopping and running frequency of the condensing fan is controlled according to the current running mode of the air-cooled cooling-water machine unit and the condensing pressure.
Description
technical field [0001] The invention relates to the technical field of air-cooled water chillers, and more specifically, to a method for controlling the condensation pressure of air-cooled water chillers under wide temperature conditions. Background technique [0002] At present, the air-cooled chillers used in the central chilled water system of passive nuclear power plants are required to operate for refrigeration throughout the year, and are also required to be able to meet the refrigeration requirements under the wide temperature range of +46°C to -40°C. As we all know, the air-cooled chiller discharges the indoor heat to the environment through heat exchange between the condenser and the ambient air. When the ambient temperature increases or decreases, the condensation pressure will also increase or decrease. In order to ensure that the condensation pressure of the system is within a reasonable range , the condensing heat transfer area needs to be increased or decreased...
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IPC IPC(8): F25B49/02F25B6/02F25B39/04F25B41/04F25B43/00F25B41/20F25B41/31
CPCF25B49/027F25B6/02F25B39/04F25B43/00F25B43/006F25B2600/17F25B41/20
Inventor王淑婉刘霄
OwnerGUANGDONG SHENLING ENVIRONMENT SYST CO LTD