Control method for varying condition operation of throttling refrigerating system of deep freezing mixed working-fluid

A refrigeration system and mixed working medium technology, which is applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., and can solve problems such as complex cycles, increased cooling process time, and system recovery delays

Inactive Publication Date: 2004-06-02
中科赛凌(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle described in this patent application is relatively complicated, there are as many as dozens of controllable valves to realize the defrosting process, and at the same time, the refrigeration system (heat excha

Method used

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  • Control method for varying condition operation of throttling refrigerating system of deep freezing mixed working-fluid
  • Control method for varying condition operation of throttling refrigerating system of deep freezing mixed working-fluid
  • Control method for varying condition operation of throttling refrigerating system of deep freezing mixed working-fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] Embodiment 1: adopt figure 1 The refrigeration process and control system shown in the figure, the system includes a mixed working medium throttling refrigeration process and operation control system, which includes a single-stage oil-lubricated commercial compressor 1 in the refrigeration process, a condenser 2 matched with the compressor, A combination of heat exchangers with a balanced flash vapor-liquid separator is used as the heat recovery unit 3 (see the schematic diagram for the specific structure Figure 5 ), a throttling control unit group 4, an evaporator 5, and some connecting pipes. The operation control system includes a control unit 6 , a compressor intake pressure sensor 601 , an exhaust pressure sensor 602 and an evaporator outlet temperature sensor 603 . The throttling control unit group includes a main throttling element A, an auxiliary throttling element B and a bypass throttling element C.

[0128] According to the variable working condition opera...

Embodiment 2

[0139] Embodiment 2: A typical mixed working medium refrigeration and control system, including a mixed working medium throttling refrigeration process and operation control system, which includes a single-stage oil-lubricated commercial compressor 1 in the refrigeration process, and a matching compressor Condenser 2, using a combination of heat exchangers with a balanced flash vapor-liquid separator as the heat recovery unit 3 (see the schematic diagram for the specific structure Figure 4 ), a throttling control unit group 4, an evaporator 5, and some connecting pipes. The operation control system includes a control unit 6 , a compressor intake pressure sensor 601 , an exhaust pressure sensor 602 and an evaporator outlet temperature sensor 603 . The throttling control unit group includes a main throttling element A, a bypass throttling element C, and an auxiliary throttling element B is composed of two parallel controllable throttling elements B1 and B2.

[0140] According ...

Embodiment 3

[0157] Embodiment 3: The refrigeration system is the same as that in Embodiment 2, except that the controllable auxiliary throttling element B in the throttling control unit group 4 consists of a parallel controllable auxiliary throttling element B1, a controllable auxiliary throttling element B2 and a controllable auxiliary throttling element B2. Controlled auxiliary throttling element B3, the control steps of the cryogenic mixed working fluid refrigeration system for variable working conditions are as follows:

[0158] 1. For the controlled cooling condition: open the main throttling element A, close the controllable bypass throttling element C,

[0159] 1) When the control unit 6 satisfies one of the following conditions, turn on the controllable auxiliary throttling elements B1, B2 and B3 at the same time:

[0160] ●The discharge pressure value 602 of the compressor unit 1 is within the set value range of 2.0MPa to 2.5MPa;

[0161] The suction pressure value 601 of the co...

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Abstract

The refrigerating system includes compressor unit in lubricant separator, cooler, heat returning unit, throttling control unit set, evaporator unit and controller unit. The input parameters of the controller unit include air admission pressure and exhaust pressure of compressor in refrigerant system and/or exit temperature of the evaporator; the output parameters are in the commands of opening and closing the throttling control unit set. The throttling control unit set includes main controllable throttle element A, auxiliary controllable throttle element B and by-pass controllable throttle element C. For cryogenic mixed work medium throttling refrigerating system with different operation states, the control method includes comparing preset value and the input parameter and controlling the opening and closing and flux of throttle element to realize the control of circulating work medium flow rate and ultimate stable and reliable operation of refrigerator in different work conditions.

Description

field of invention [0001] The invention relates to low-temperature refrigeration technology, in particular to a control method for the operation of a cryogenic mixed working medium throttling refrigeration system under variable working conditions, so as to realize the efficient and reliable operation of the mixed working medium throttling refrigeration system under variable working conditions. Background technique [0002] The minimum effective refrigeration temperature of the traditional single-stage vapor compression refrigeration cycle is generally around -40°C. To achieve a lower refrigeration temperature, it is often necessary to use multi-stage compression and multi-stage external cascade cycles. However, this measure obviously makes the refrigeration system become It is very complicated and the reliability is reduced. At present, two-stage compression is used to achieve a refrigeration temperature of about -60°C, and a two-stage cascade cycle is used to achieve a refri...

Claims

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Application Information

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IPC IPC(8): F25B49/02F25J3/00
Inventor 吴剑峰公茂琼罗二仓
Owner 中科赛凌(北京)科技有限公司
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