Exhaust superheat degree control method of refrigerating and heat pump unit

A technology of exhaust superheat and heat pump units, which is applied in the direction of refrigerators, refrigeration components, refrigeration safety arrangements, etc., can solve the problems of high cost and expensive pressure sensors, and achieve the effect of reducing control costs and ensuring safe operation

Inactive Publication Date: 2018-06-15
韩军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the pressure sensor is relatively expensive, t

Method used

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  • Exhaust superheat degree control method of refrigerating and heat pump unit
  • Exhaust superheat degree control method of refrigerating and heat pump unit
  • Exhaust superheat degree control method of refrigerating and heat pump unit

Examples

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Example Embodiment

[0044] Example 1

[0045] Such as figure 1 As shown, this embodiment 1 describes a method for controlling the superheat degree of exhaust gas in a refrigeration and heat pump unit. This method is suitable for the situation where there are two air heat exchangers in the refrigeration and heat pump unit at the same time, such as Figure 4 Shown.

[0046] A method for controlling exhaust superheat in a refrigeration and heat pump unit includes the following steps:

[0047] s11. Use the exhaust temperature sensor 2 to collect the exhaust temperature t1 of the compressor 1.

[0048] Wherein, the exhaust temperature sensor 2 is arranged at a position 50-300 mm away from the compressor exhaust port, for example, it may be 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, and so on.

[0049] s12. Use the ambient temperature sensor 3 to measure the temperature t2 at the air inlet when one of the air heat exchangers 5 is used as a condenser. Wherein, the ambient temperature sensor 3 is arranged at the air ...

Example Embodiment

[0063] Example 2

[0064] Such as figure 2 As shown, this embodiment 2 also describes a method for controlling the superheat degree of exhaust gas in a refrigeration and heat pump unit. This method is suitable for the situation where there are two water-cooled heat exchangers in the refrigeration and heat pump unit at the same time, such as Figure 5 Shown.

[0065] A method for controlling exhaust superheat in a refrigeration and heat pump unit includes the following steps:

[0066] s21. Use the exhaust temperature sensor to collect the exhaust temperature T1 of the compressor 1.

[0067] Wherein, the exhaust temperature sensor 2 is arranged at a position 50-300 mm away from the compressor exhaust port, for example, it may be 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, and so on.

[0068] s22. Use the cooling outlet water temperature sensor 4 to measure the outlet water temperature T2 when one of the water-cooled heat exchangers 6 is used as a condenser.

[0069] Wherein, the cooling water ...

Example Embodiment

[0076] Example 3

[0077] Such as image 3 As shown, this embodiment 3 also describes a method for controlling the superheat degree of exhaust gas in a refrigeration and heat pump unit. This method is suitable for the situation where there is a water-cooled heat exchanger and an air heat exchanger in the refrigeration and heat pump unit, such as Image 6 Shown.

[0078] There are two situations in the exhaust superheat control method in the third embodiment:

[0079] The first is that the air heat exchanger 5 is used as a condenser and the water-cooled heat exchanger 6 is used as an evaporator; the second is that the water-cooled heat exchanger 6 is used as a condenser and the air heat exchanger 5 is used as an evaporator. among them:

[0080] In the first case, the exhaust superheat control method is performed according to the following steps:

[0081] s31. Use the exhaust temperature sensor 2 to collect the exhaust temperature L1 of the compressor.

[0082] Wherein, the exhaust tempe...

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Abstract

The invention discloses an exhaust superheat degree control method of a refrigerating and heat pump unit. The exhaust superheat degree control method of the refrigerating and heat pump unit comprisesthe following steps that S1, the exhaust temperature of a compressor is collected through an exhaust temperature sensor; S2, the temperature at an air inlet (or a liquid outlet pipe) when an air heatexchanger serves as a condenser or the outlet water temperature when a water-cooling heat exchanger serves as a condenser are measured; S3, the environment temperature corrected value or the water temperature corrected value is calculated; S4, a controller collects the temperatures in the S1, S2 and S3 and calculates the exhaust superheat degree. After the unit runs and goes into a normal state, the controller judges the size relation between the exhaust superheat degree and an exhaust superheat threshold value, and if the exhaust superheat degree is larger than or equal to the exhaust superheat threshold value, the unit is within a safety range; and if the exhaust superheat degree is smaller than the exhaust superheat threshold value, a failure code is reported. According to the exhaust superheat degree control method of the refrigerating and heat pump unit, the exhaust superheat degree can be calculated on the basis that the controller and the sensor are not additionally arranged, and it is guaranteed that the unit safely runs.

Description

technical field [0001] The invention relates to a method for controlling the superheat degree of exhaust gas in a refrigeration and heat pump unit. Background technique [0002] In refrigeration and heat pump units, common evaporators include air evaporators and water heat exchange evaporators. Among them, the air evaporator needs to be equipped with an exhaust fan device, while the water heat exchange evaporator needs to be equipped with a water pump device. [0003] Exhaust superheat usually refers to the difference between the exhaust temperature and the temperature corresponding to the condensing pressure. For example: [0004] If the exhaust temperature is 75°C, the temperature corresponding to the condensing pressure is 50°C, then the exhaust superheat is: 75°C-50°C=25°C, and the unit is in a safe range; if the exhaust temperature is 65°C, the condensing pressure corresponds to If the temperature is 50°C, the degree of superheat of the exhaust gas is: 65°C-50°C=15°C...

Claims

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Application Information

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IPC IPC(8): F25B30/02F25B49/02
CPCF25B30/02F25B49/022F25B2700/21152F25B2700/21162
Inventor 韩军
Owner 韩军
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