TW202200946A - Condensing pressure control method applied to refrigeration system and the refrigeration system - Google Patents

Abstract

A condensing pressure control method applied to a refrigeration system, and the refrigeration system includes a compressor, a condenser, an expansion valve, an evaporator, and a controller. The control method includes following steps. The controller continuously records a first temperature of the evaporator, a second temperature of the expansion valve, and a third temperature of the refrigeration system according to a time series. The controller performs calculations based on plural temperature differences and plural second temperatures. When the controller determines that a refrigeration temperature of the refrigeration system is too low, a refrigerant temperature is too high, and the third temperature is lower than a preset value of a first ambient temperature, the controller continuously reduces a condensing pressure of the condenser.

Description

Condensing pressure control method applied to refrigeration system and refrigeration system thereof

The invention relates to a condensing pressure control method, in particular to a condensing pressure control method for adjusting the condensing pressure of the condenser by judging the operation state of the compressor.

Most of the general condensing pressure control devices have a fixed condensing pressure setting value, but the heat load of the evaporator will vary due to the temperature and humidity conditions of the surrounding environment, the conditions of frequency of use and the external climate. Therefore, fixing the set value of condensing pressure often causes the compressor to be set too high when the compressor is running at low load or in a very cool climate, resulting in high energy consumption and reduced operating life of the compressor.

Therefore, how to design a condensing pressure control method, especially to solve the aforementioned technical problems in the prior art, is an important subject studied by the inventor of the present application.

One object of the present invention is to provide a condensing pressure control method, which can solve the problem that the compressor in the prior art operates at a low load, the condensing pressure is set too high, and the resulting compressor consumes high energy and reduces its operating life, so as to achieve the conditions controlled by the condenser. It can control the stability of freezing and refrigerating load and the purpose of energy saving.

In order to achieve the aforementioned object, the condensing pressure control method proposed by the present invention is applied to a refrigeration system, and the refrigeration system includes a compressor, a condenser, an expansion valve, an evaporator and a controller, and the judgment method includes: : measure a condensation pressure of the condenser; measure a first temperature of an air outlet of the evaporator; measure a second temperature of a refrigerant outlet of the expansion valve; measure a third temperature of the refrigeration system ambient temperature; And the controller continuously records the first temperature for N, the second temperature for N and the third temperature for N according to a time series, and obtains the temperature between the first temperature for N and the third temperature for N. N temperature differences; wherein, the controller performs a normal operation state operation on the N temperature differences to obtain a normal operation parameter; the controller performs sequential sampling on the N temperature differences and M temporary operation states for the temperature differences operation to obtain a transient operation parameter; wherein, the controller performs a normal refrigerant state operation on N records of the second temperature to obtain a normal refrigerant state parameter; the controller performs sequential sampling on the N records of the second temperature and M records of the The second temperature performs transient refrigerant state calculation to obtain a transient refrigerant state parameter; wherein the controller determines whether a cooling state of the refrigeration system is too low according to the normal operation parameter and the transient operation parameter; the controller According to the normal refrigerant state parameter and the transient refrigerant state parameter to determine whether a refrigerant temperature of the refrigerant is too high, when the controller determines that the cooling state is too low and the refrigerant temperature is too high and the third temperature of the Nth pen is less than one When the first ambient temperature preset value is used, the controller determines that the compressor is operating in a low-load state, and the controller continuously reduces the condensing pressure until the refrigeration state is too low or the refrigerant temperature is too high. The controller stops reducing the condensing pressure.

Further, the condensing pressure control method further includes: the controller performs an operating state deviation calculation on the N temperature differences to obtain an operating state deviation parameter; when the controller determines that the transient operating parameter is less than the When the difference between the normal operating parameter and the operating state deviation parameter, the controller determines that the cooling state is too low.

Further, the condensing pressure control method further includes: the controller performs a refrigerant state deviation calculation on the N second temperatures to obtain the refrigerant state deviation parameter; when the controller determines the transient refrigerant state parameter When it is greater than the difference between the normal refrigerant state parameter and the refrigerant state deviation parameter, the controller determines that the refrigerant temperature is abnormal and accumulates the number of times the refrigerant temperature is abnormal to obtain an accumulated value; wherein, when the accumulated value and the quotient of M When the temperature is greater than a first threshold, the controller determines that the temperature of the refrigerant is too high.

Further, the condensing pressure control method further includes: when the quotient of the accumulated value and M is less than a second threshold value and the third temperature is greater than a second ambient temperature preset value, the controller determines that The compressor is in a high load state, and the controller continuously increases the condensing pressure until the quotient of the accumulated value and M is greater than a second threshold or the third temperature is less than the second ambient temperature preset value, The controller stops raising the condensing pressure.

Further, in the condensation pressure control method, the data of the second temperature and the temperature difference of the M samples for sampling include the Nth data of the second temperature and the Nth data of the temperature difference.

In order to achieve the aforementioned purpose, the present invention provides a refrigeration system with a condensing pressure adjustment function, comprising: a compressor; a condenser connected to the compressor; an expansion valve connected to the condenser; an evaporator connected to the expansion valve and the compressor A condensing pressure gauge, measuring the refrigerant pressure at the outlet of the condenser; a first thermometer, measuring a first temperature at an air outlet of the evaporator; a second thermometer, measuring a second temperature at a refrigerant outlet of the expansion valve; a third thermometer, measuring a third temperature value of the ambient temperature of the refrigeration system; and a controller, electrically connected to the condenser, the first thermometer, the second thermometer, the third thermometer, the condensation pressure gauge and the expansion valve ; wherein, the controller executes the aforementioned method for adjusting the condensing pressure.

Compared with the traditional method, due to the lack of monitoring methods for the compressor, it is often impossible to know that the compressor has been running at a low load for a long time, so that the condensing pressure of the condenser is set too high, resulting in high energy consumption and operation of the compressor. Lifespan is reduced.

Therefore, the condensing pressure control method of the present invention can solve the problems of high energy consumption and reduced operating life of the compressor in the prior art, and achieve the purpose of refrigerating and refrigerating load stability and energy saving of the overall system.

In order to further understand the technology, means and effect of the present invention to achieve the predetermined purpose, please refer to the following detailed description of the present invention and the accompanying drawings. It is believed that the features and characteristics of the present invention can be used to gain a deep and specific understanding. However, the accompanying drawings are only provided for reference and description, and are not intended to limit the present invention.

The following describes the implementation of the present invention through specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied by other different specific examples, and various modifications and changes can be made to the details in the description of the present invention based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the structure, proportion, size, number of components, etc. shown in the drawings in this specification are only used to cooperate with the content disclosed in the specification for the understanding and reading of those skilled in the art, and are not intended to limit the scope of the present invention. The limitations of the implementation, so it has no technical significance, any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, shall fall within the scope of this The technical content disclosed by the invention can be covered within the scope.

The technical content and detailed description of the present invention are described as follows in conjunction with the drawings.

Please refer to Figure 1 and Figure 2. Among them, FIG. 1 is a system schematic diagram of an embodiment of a refrigeration system with a condensing pressure control method according to the present invention. FIG. 2 is a schematic structural diagram of the embodiment of the refrigeration system with the condensing pressure control method of the present invention.

In one embodiment of the present invention, the refrigeration system with the condensing pressure control method includes: a compressor 10, a condenser 20, an expansion valve 30, an evaporator 40, a first thermometer T10, a second thermometer T20, and a third thermometer T30, condensing pressure gauge P10, fan 50 and controller 70; wherein condenser 20 is connected to compressor 10, expansion valve 30 is connected to condenser 20, evaporator 40 is connected to expansion valve 30 and compressor 10, and first thermometer T10 measures evaporation The first temperature T1 (not shown in the figure) of the air outlet of the device 40, the second thermometer T20 measures the second temperature T2 (not shown in the figure) of the refrigerant outlet of the expansion valve 30, and the third thermometer T30 measures the ambient temperature of the refrigeration system. The third temperature T3 (not shown in the figure), the condensing pressure gauge P10 measures the refrigerant pressure at the outlet of the condenser 20, the condenser 20 includes a condensing fan 21, and the condensing fan 21 is arranged at the air inlet of the condenser to dissipate heat to the condenser, The fan 50 is disposed at the air inlet of the evaporator 40 to transmit air into the evaporator 40 . The controller 70 is electrically connected to the compressor 10 , the condensing fan 21 , the first thermometer T10 , the second thermometer T20 , the third thermometer T30 , the condensing pressure gauge P10 , and the expansion valve 30 , respectively.

The controller 70 continuously records N first temperature T1, N second temperature T2, and N third temperature T3 according to the time series (where N>1), and obtains N first temperature T1 and N first temperature T1. The N temperature difference Yi between the third temperature T3 and the N second temperature T2 and the temperature difference Yi and the Nth third temperature T3 can be used to determine the temperature state of the refrigerant and the cooling state, and further determine the compressor. Whether the compressor 10 is operating in a low load state, when the controller 70 determines that the compressor 10 is operating in a low load state, the controller 70 continuously reduces the set value of the condensing pressure gauge P10 to reduce the condensing pressure of the condenser 20 .

The controller 70 can determine whether the compressor 10 is operating in a low load state by determining whether the refrigerant temperature is too high, whether the cooling state is too low, and whether the third temperature T3 is lower than the first ambient temperature preset value Tset1 (not shown in the figure) In order to judge, the following is a further explanation:

進行常態冷媒狀態運算，獲得常態冷媒狀態參數

，接著控制器70對N筆第二溫度進行序列抽樣取出其中M筆(其中，M＞1)第二溫度，並對M筆第二溫度進行暫態冷媒狀態運算，獲得暫態冷媒狀態參數

，其中M筆第二溫度的內容可包含第N筆第二溫度數值，控制器70對常態運轉參數

進行冷媒狀態乖離運算，獲得冷媒狀態乖離參數

，當控制器70判斷暫態冷媒狀態參數參數

大於常態冷媒狀態參數

時，控制器70判斷冷媒溫度異常；更進一步地，為了使判斷結果更精準，可將常態冷媒狀態參數

與冷媒狀態乖離參數

微分之差值進行比較，即當控制器70判斷

時，控制器70判斷冷媒溫度異常。The method for judging whether the temperature of the refrigerant is too high is that the controller 70 sets the N second temperature T2=

Perform normal refrigerant state operation to obtain normal refrigerant state parameters

, and then the controller 70 performs sequential sampling on N second temperatures to take out M (where M>1) second temperatures, and performs transient refrigerant state operation on M second temperatures to obtain transient refrigerant state parameters

, wherein the content of the M second temperature can include the Nth second temperature value.

Perform refrigerant state deviation calculation to obtain refrigerant state deviation parameters

, when the controller 70 judges the state parameter of the transient refrigerant

Greater than normal refrigerant state parameters

When the temperature of the refrigerant is abnormal, the controller 70 judges that the temperature of the refrigerant is abnormal; further, in order to make the judgment result more accurate, the normal refrigerant state parameter can be

Deviation parameter from refrigerant state

The difference between the differentials is compared, that is, when the controller 70 judges

At this time, the controller 70 determines that the temperature of the refrigerant is abnormal.

時，控制器70判斷冷媒溫度過高。When the controller 70 determines that the abnormality of the refrigerant temperature occurs, the controller 70 counts the abnormal accumulated value C, and then the controller 70 determines that when the abnormal accumulated value C is greater than the first threshold value f, the controller 70 confirms the refrigerant temperature is too high; in order to make the judgment more accurate, in the embodiment of the present invention, the controller 70 judges that when the quotient of the accumulated value C divided by the value of M that has been counted is greater than the first threshold f, that is,

At this time, the controller 70 determines that the temperature of the refrigerant is too high.

進行常態製冷狀態運算，獲得常態製冷參數F

。控制器70對N筆溫度差進行序列抽樣取出其中M筆(其中，M＞1)溫度差，並對M筆溫度差進行暫態製冷狀態運算，獲得暫態製冷狀態參數

，其中M筆溫度差的內容包含第N筆溫度差數值，控制器70對常態製冷參數

進行製冷狀態乖離運算，獲得製冷狀態乖離參數

，當控制器70判斷暫態製冷參數

小於或等於常態製冷參數

時，控制器判斷冷凍系統製冷狀態過低；同樣地，為了使判斷結果更準確，可將常態製冷狀態參數F以及製冷狀態乖離參數E微分之差值作為比較依據，即當

時，控制器判斷冷凍系統製冷狀態過低。On the other hand, the method for judging whether the cooling state is too low is that the controller 70 compares the N temperature differences T3-T1=

Perform the normal cooling state operation to obtain the normal cooling parameter F

. The controller 70 performs sequential sampling on N temperature differences to obtain M temperature differences (where M>1), and performs a transient cooling state operation on the M temperature differences to obtain transient cooling state parameters.

, wherein the content of the M temperature difference includes the Nth temperature difference value, and the controller 70 adjusts the normal cooling parameters

Perform cooling state deviation calculation to obtain cooling state deviation parameters

, when the controller 70 judges the transient cooling parameter

Less than or equal to normal cooling parameters

When , the controller judges that the refrigeration state of the refrigeration system is too low; similarly, in order to make the judgment result more accurate, the difference between the normal refrigeration state parameter F and the differential of the refrigeration state deviation parameter E can be used as a comparison basis, that is, when

When , the controller judges that the cooling state of the refrigeration system is too low.

When the controller 70 determines that the refrigerant temperature of the refrigeration system is too high and the cooling state is too low and the third temperature T3 is less than the first ambient temperature preset value Tset1, the controller 70 determines that the compressor 10 is operating in a low load state and the controller 70 Continuously reduce the set value of the condensing pressure gauge P10, so that the condensing pressure of the condenser 20 is reduced until the condition of the refrigerant temperature is too high or the cooling state is too low, or when it is lower than the minimum lower limit required by the original compressor, control the The device 70 stops lowering the set value of the condensing pressure gauge P10; wherein, the so-called continuous lowering of the set value of the condensing pressure gauge P10 can be carried out at a fixed frequency during actual operation, in which each set value adjustment The range of reduction can be fixed or not, and is not limited to this.

In particular, the controller 70 can indirectly drive the relevant components by lowering the set value of the condensing pressure gauge P10 to lower the condensing pressure of the condenser 20. Taking this embodiment as an example, when the controller 70 lowers the condensing pressure gauge P10 When the set value is set, the speed of the condenser cooling fan 21 is adjusted to increase the fan speed according to the difference between the set value of the condensing pressure gauge P10 and the current condensing pressure value, so that the air flow through the condenser 20 increases and the condensing pressure gradually decreases to the set value of the condensing pressure P10; in other embodiments of the auxiliary cooling condenser, such as water cooling, the condensing pressure can also be decreased by increasing the water flow rate or increasing the fan speed of the cooling water tower.

On the other hand, the controller 70 can also use the same data to determine whether the compressor 10 is in a high-load state, and the relevant determination process is described below;

時，控制器70判斷冷媒溫度正常，當控制器70判斷冷媒溫度正常且第N筆的該第三溫度T3大於該第二環境溫預設值Tseth時，該控制器70判斷該壓縮機為高負載狀態，該控制器70連續性地升高冷凝壓力計P10的冷凝壓力設定值直到該累加值C與M之商值大於一第二閥值h或該第三溫度小於該第二環境溫預設值Tseth時或高於壓縮機原廠要求之最高上限值時，該控制器停止升高該冷凝壓力；The controller 70 confirms that the quotient of the accumulated value C and M is less than a second threshold h, namely

, the controller 70 judges that the temperature of the refrigerant is normal, and when the controller 70 judges that the temperature of the refrigerant is normal and the third temperature T3 of the Nth pen is greater than the second ambient temperature preset value Tseth, the controller 70 judges that the compressor is high In the load state, the controller 70 continuously increases the set value of the condensing pressure of the condensing pressure gauge P10 until the quotient of the accumulated value C and M is greater than a second threshold h or the third temperature is less than the second ambient temperature preset. When the value of Tseth is set or higher than the maximum upper limit value required by the original compressor, the controller stops increasing the condensing pressure;

Wherein, when the controller 70 lowers or raises the set value of the condensing pressure of the condensing pressure gauge P10, it is all based on the minimum pressure lower limit value or the maximum pressure upper limit value required by the compressor 10. A threshold value f is greater than the second threshold value h.

In particular, the preset values of the first ambient temperature preset value Tset1 and the second ambient temperature preset value Tseth may be equal or unequal. The second ambient temperature preset value Tseth.

Please refer to FIG. 3 , which is a system schematic diagram of another embodiment of the refrigeration system with the function of judging the abnormal state of the device of the present invention. This embodiment is basically the same as the previous embodiment, except that the compressor 10 and the condenser 20 are respectively The two sets are arranged in parallel with each other, and the refrigeration system further includes three condensing pressure gauges P10, wherein the condensing pressure gauges P10 can be respectively arranged at the refrigerant outlet of each condenser and the parallel outlet of the refrigerant outlet pipeline, and the controller 70 can The compressor operation is optimized by adjusting the condensing pressure by adjusting the set value of any one or any combination of the condensing pressure gauge P10.

Please refer to FIG. 4 , which is a schematic diagram of the steps of the condensing pressure control method of the present invention to determine that the compressor 10 is operating under a low load state.

First, the controller 70 measures the first temperature T1 of the air outlet of the evaporator 40 through the first thermometer T10 (step S1); the controller 70 measures the second temperature T2 of the refrigerant outlet of the expansion valve 30 through the second thermometer T20 (step S2) The controller 70 measures the third temperature T3 of the refrigerating system environment through the third thermometer T30 (step S3); the controller 70 continuously records N first temperature T1, N second temperature T2 and N third temperature according to the time series temperature T3, and obtain N temperature differences between N pieces of the first temperature and N pieces of the third temperature (step S4).

Next, the controller 70 judges whether the temperature of the refrigerant is too high, whether the cooling state is too low, and whether the third temperature T3 of the Nth pen is less than the first ambient temperature preset value Tset1 (steps S5-S7), if both are, the controller 70 It is determined that the compressor is operating in a low load state and the condensing pressure is continuously lowered, that is, the controller 70 continuously lowers the set value of the condensing pressure gauge P10 (step S8).

Please further refer to FIG. 5 , which is a schematic flowchart of the steps of the condensing pressure control method of the present invention for judging that the compressor is operating in a high-load state.

The controller 70 measures the second temperature T2 of the refrigerant outlet of the expansion valve 30 through the second thermometer T20 (step H1); the controller 70 measures the third temperature T3 of the refrigeration system environment through the third thermometer T30 (step H2); the controller 70 Continuously record N first temperature T1 and N second temperature T2 according to time series, and obtain N temperature difference between N first temperature and N second temperature (step H3).

判斷冷媒溫度正常且該第三溫度大於第二環境溫預設值Tseth時(步驟H4~H5)，該控制器70判斷壓縮機10為高負載狀態且控制器70連續性地升高冷凝器的冷凝壓力，即控制器70連續性地升高冷凝壓力計P10的設定值。(步驟H6)Next, the controller 70 determines whether the temperature of the refrigerant is normal. The controller 70 determines that the quotient of the accumulated value C and M is smaller than a second threshold h, namely

When judging that the refrigerant temperature is normal and the third temperature is greater than the second ambient temperature preset value Tseth (steps H4-H5), the controller 70 judges that the compressor 10 is in a high load state and the controller 70 continuously increases the condenser Condensing pressure, that is, the controller 70 continuously increases the set value of the condensing pressure gauge P10. (step H6)

The present invention uses the first temperature T1, the second temperature T2 and the third temperature T3 of the controller to perform operations to determine various states such as the temperature state of the refrigerant and the refrigeration state of the refrigerating system, and combines the value of the third temperature T3 of the Nth pen to determine the compressor 10 The load condition of the operation and then adjust the pressure setting value of the condensing pressure gauge P10 to change the condensing pressure of the condenser, thereby achieving the purpose of the optimal condensing pressure, ensuring the temperature control stability and energy saving of the environment controlled by the evaporator.

The above descriptions are only detailed descriptions and drawings of the preferred embodiments of the present invention, but the features of the present invention are not limited thereto, and are not intended to limit the present invention. The entire scope of the present invention should be defined as the following claims All embodiments that conform to the spirit of the scope of the patent application of the present invention and similar variations thereof shall be included in the scope of the present invention. Any person familiar with the art in the field of the present invention can easily think of the variations. Or modifications can be covered by the following patent scope of this case.

10: Compressor

20: Condenser

21: Condensing fan

30: Expansion valve

40: Evaporator

50: Fan

70: Controller

T10: First Thermometer

T20: Second Thermometer

T30: Third Thermometer

P10: Condensation pressure gauge

Tsetl: The first ambient temperature preset value

Tseth: The second ambient temperature preset value

S1~S8: Steps

H1~H6: Steps

1 is a system schematic diagram of an embodiment of a refrigeration system with a condensation pressure control method according to the present invention;

2 is a schematic structural diagram of the embodiment of the refrigeration system with the condensing pressure control method of the present invention;

FIG. 3 is a system schematic diagram of another embodiment of a refrigeration system with a condensing pressure control method according to the present invention.

FIG. 4 is a flow chart showing the steps of the method for controlling the condensing pressure of the present invention when it is judged that the compressor is operating in a low load state.

FIG. 5 is a flow chart showing the steps of the condensing pressure control method of the present invention for judging that the compressor is operating in a high load state.

10: Compressor

20: Condenser

21: Condensing fan

30: Expansion valve

40: Evaporator

50: Fan

T10: First Thermometer

T20: Second Thermometer

T30: Third Thermometer

P10: Condensation pressure gauge

Claims (6)

A condensing pressure control method, applied to a refrigeration system, the refrigeration system includes a compressor, a condenser, an expansion valve, an evaporator and a controller, and the judgment method includes: Measure a condensing pressure of the condenser measuring a first temperature of an air outlet of the evaporator; measuring a second temperature of a refrigerant outlet of the expansion valve; a third temperature that measures the ambient temperature of the refrigeration system; and The controller continuously records N pens of the first temperature, N pens of the second temperature and N pens of the third temperature according to a time series, and obtains N pens of the first temperature and N pens of the third temperature pen temperature difference; Wherein, the controller performs a normal operation state operation on the N temperature differences to obtain a normal operation parameter; the controller performs sequential sampling on the N temperature differences and M performs a transient operation state operation on the temperature differences to obtain a temporary operation parameter. state operating parameters; Wherein, the controller performs a normal refrigerant state operation on the N second temperatures to obtain a normal refrigerant state parameter; the controller performs sequential sampling on the N second temperatures and M temporary refrigerant state operations on the second temperatures , obtain a transient refrigerant state parameter; Wherein, the controller judges whether a refrigeration state of the refrigeration system is too low according to the normal operation parameter and the transient operation parameter; the controller judges a refrigerant of the refrigerant according to the normal refrigerant state parameter and the transient refrigerant state parameter Whether the temperature is too high, when the controller determines that the cooling state is too low and the temperature of the refrigerant is too high, and the third temperature of the Nth pen is less than a first ambient temperature preset value, the controller determines that the compressor is running at In a low load state, the controller continuously reduces the condensing pressure, and stops reducing the condensing pressure until the refrigerant temperature is too high or the refrigeration state is too low. The condensing pressure control method as claimed in claim 1, further comprising: The controller performs an operating state deviation calculation on the N temperature differences to obtain an operating state deviation parameter; when the controller judges that the transient operating parameter is less than the difference between the normal operating parameter and the differential of the operating state deviation parameter, The controller determines that the cooling state is too low. The condensing pressure control method as claimed in claim 2, further comprising: The controller performs a refrigerant state deviation operation on the N second temperatures to obtain the refrigerant state deviation parameter; when the controller determines that the transient refrigerant state parameter is greater than the difference between the normal refrigerant state parameter and the refrigerant state deviation parameter differential value, the controller judges that the temperature of the refrigerant is abnormal and accumulates the abnormal times of the temperature of the refrigerant to obtain an accumulated value; wherein, when the quotient of the accumulated value and M is greater than a first threshold, the controller judges that the refrigerant is abnormal Temperature is too high. The condensing pressure control method as claimed in claim 3, further comprising: When the quotient of the accumulated value and M is less than a second threshold and the third temperature of the Nth pen is greater than a second ambient temperature preset value, the controller determines that the compressor is in a high load state, and the controller Continuously increasing the condensing pressure until the quotient of the accumulated value and M is greater than a second threshold or the third temperature is less than the second ambient temperature preset value, the controller stops increasing the condensing pressure. The condensing pressure control method as claimed in claim 4, wherein the M data of the second temperature and the M data of the temperature difference including the Nth data of the second temperature and the Nth data of the temperature difference. A refrigeration system with condensing pressure adjustment, comprising: a compressor; a condenser, connected to the compressor; an expansion valve, connected to the condenser; an evaporator, connected to the expansion valve and the compressor; A condensing pressure gauge to measure the refrigerant pressure at the outlet of the condenser; a first thermometer to measure a first temperature of an air outlet of the evaporator; a second thermometer for measuring a second temperature of a refrigerant outlet of the expansion valve; a third thermometer measuring a third temperature value of the ambient temperature of the refrigeration system; and a controller electrically connected to the condenser, the first thermometer, the second thermometer, the third thermometer, the condensation pressure gauge and the expansion valve; Wherein, the controller executes the condensing pressure adjustment method according to any one of claim items 1 to 5.

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