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Refrigeration air-cooling unit and control method thereof

A control method and unit technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problem of inability to take into account the antifreeze and refrigeration efficiency of the evaporator at the same time, so as to reduce the condensation effect, reduce the frequency, and improve the refrigeration efficiency. Effect

Inactive Publication Date: 2016-12-14
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the refrigerating air-cooled unit in the prior art cannot take into account both the anti-freezing and refrigeration efficiency of the evaporator, thereby providing a refrigerating air-cooled unit and its control method

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  • Refrigeration air-cooling unit and control method thereof

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specific Embodiment approach

[0086] The first two points of the technical problems solved by this plan are mainly for the antifreeze of the shell and tube, and the third point is for the feasibility of natural cooling.

[0087] In order to prevent the shell tube from freezing and cracking, there are two main considerations:

[0088] 1) The inlet temperature of the shell-and-tube refrigerant is controlled, and the design is not lower than -5°C;

[0089] 2) The saturation temperature corresponding to the evaporation pressure has been maintained above 0°C.

[0090] 【Question 1】

[0091] Objective: To solve the anti-freezing problem of the shell and tube when the natural cooling cycle runs stably.

[0092] Measures: During the natural cooling cycle, in an ultra-low temperature environment (such as -40 ° C), the condensation effect of the refrigerant in the finned tube condenser is very good, and the temperature of the refrigerant at the outlet of the condenser (that is, the temperature at the inlet of the r...

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Abstract

The invention provides a refrigeration air-cooling unit and a control method thereof. The unit comprises a steam compression circulation loop formed by the connection of a compressor (1), a condensing device (2), an expansion valve (3) and an evaporator (4) and further comprises a natural cooling circulation loop formed by the connection of a refrigerant pump (5), the condensing device (2) and the evaporator (4), wherein water is used as a refrigerating medium in the evaporator (4); and the condensing device (2) comprises a plurality of condensers (21) arranged in parallel, and the natural cooling circulation loop comprises at least one of the condensers (21). Through the refrigeration air-cooling unit and the control method thereof, the condensing area of natural cooling circulation can be effectively reduced, the outlet temperature of the condensing device is accordingly lowered, the evaporator is effectively prevented from being damaged, and the purposes and effects of preventing the freezing of the evaporator and keeping refrigerating efficiency are simultaneously realized.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a refrigeration air-cooled unit and a control method thereof. Background technique [0002] The ultra-low temperature refrigeration air-cooled units currently on the market, due to the low ambient temperature, if water is used as the refrigerant, it is very easy to freeze the shell-and-tube pressure vessel used as the evaporator. Therefore, ethylene glycol aqueous solution is often used as the refrigerant. as attached figure 1 As shown, the vapor compression refrigeration cycle and the natural cooling cycle are two independent systems, do not share refrigerant, and share an evaporator to deliver cooling capacity to the end. The advantage of this technology is that the evaporator is not easy to freeze and has high reliability, but the disadvantages are: 1) the ethylene glycol solution needs to circulate at the end of the room, and there is a risk of leakage; 2) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F5/00F25B41/06F25B41/04F25B49/02F25B41/20F25B41/31
CPCF24F5/0046F25B49/02F25B41/22F25B41/31Y02B30/70
Inventor 黄凯亮程琦钟海玲刘思源吉剑林
Owner GREE ELECTRIC APPLIANCES INC
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