Refrigeration plant control method

FIELD: self-contained movable devices, for instance domestic refrigerator with cooling compartments at different temperatures.

SUBSTANCE: control method for double-chamber refrigerating plant involves taking fresh product chamber 1 temperature as reference temperature, wherein heat penetration in above fresh product chamber 1 is low at low ambient air temperature; using fresh product chamber 1 temperature and repeatedly starting compressor 4 by activating heater 3 to avoid long inactive state of compressor 4 and to increase freezing chamber 2 temperature up to value exceeding desired temperature value. Heater 3 activating time is dynamically determined in dependence of compressor 4 operation intensity.

EFFECT: provision of optimal operational characteristics of refrigeration plant irrespective of ambient temperature change.

5 cl, 3 dwg

 

The present invention relates to a method of control, which ensures optimum operating characteristics of the cooling of the refrigerating apparatus regardless of changes in ambient temperature.

Household refrigerators are usually composed of two main cameras supported at different temperatures, namely camera for the fresh food and freezer. Chamber for fresh products preferably used for storing fresh food, while the freezer is used for storage of frozen products. Given the existing level of technology, the working characteristic of the cooling of the refrigerating apparatus with two cameras supported at different temperatures, provided different circuits for each camera. The production costs of such refrigeration devices are high.

In the above-mentioned refrigerating devices with two cameras, supported at different temperatures can also be used a single cooling circuit and the temperature sensor located in the chamber for fresh ingredients to ensure cooling. In refrigerators, where the cooling is achieved by maintaining the temperature of the camera for fresh produce as a reference, the main problem occurs when the ambient temperature falls below a pre-ass the authorized amount. In this case, the heat gain in the fridge is very small, and the intensity of operation of the compressor is reduced, which in turn has a negative impact on the efficiency of the cooling of the freezing chamber. During long idle periods of the compressor, the temperature in the freezer rises, exceeding the desired temperature value, which subsequently leads to reduction in the shelf life of frozen foods or damage to the products contained in the freezer. To resolve the above problem, in the chamber for fresh food refrigeration unit is mounted heating element. In cases where the ambient temperature is below the setpoint, the heater is activated to raise the temperature of the chamber for fresh produce and to operate the compressor. In this way, when the ambient temperature is low, and the compressor remains on for a long time, the temperature fluctuations are observed in both cameras. In addition, you cannot avoid increasing the temperature of the freezing chamber to a value greater than the specified value.

In the French patent No. 2254762 described refrigerating device with two cameras supported at different temperatures, which uses a single cooling circuit and the temperature sensor, located in the chamber for fresh produce. When implementing the above-mentioned cooling method provided the best operating conditions for the compressor due to the actuation of the heating element, when the compressor is in a disconnected state, to avoid the above mentioned problems. This method results in a large power consumption, since the heater is turned on and when the ambient temperature is high. To overcome this drawback in the Italian patent No. 1027733 suggested disabling the heating element through the body of the manual control when the ambient temperature is relatively high. This method is not very accurate since it requires the personal intervention of the user, i.e. is dependent on the consumer.

Another implementation of this method is described in the French patent No. 2347634, according to which to determine the ambient temperature sensor is installed on the outer surface of the refrigeration apparatus. However, this method is quite complex, and its results can easily be affected by changes in ambient temperature. In addition, due to the installation of the temperature sensor to the outside of the refrigerating apparatus increases the cost of manufacturing.

In the application No. 038876 for the European patent proposed solution, according to which the system incorporates a timer to reduce unwanted power consumption. Temperature is detected by a sensor located in the chamber for fresh produce. If the period when the compressor is not running, shorter than the specified delay, the heater does not turn on, so no unwanted power will not. When the ambient temperature is low, the period during which the compressor is not running, becomes longer than the preset delay, so that the heating element is activated. Although this method is easier and more efficient compared with other methods, though, because after a certain delay period of the heating process as the necessary heaters with relatively large output capacity, as well as needs arise in space due to the volume occupied by the heating element, and these shortcomings lead to the phenomena of local overheating inside the chamber.

Due to the need to overcome such deficiencies identified in the application No. 0388726 for the European patent, application No. 0484860 for the European patent proposed solution, according to which the heater is activated immediately when a work period of the compressor is less than a preset minimum value, and this heat is the motor continues to operate until until the compressor is switched on. In this implementation, the heater without having to work even when it's not needed, causing an increase in energy consumption.

The present invention is to realize a control method, giving the refrigerating apparatus is able to provide optimum operating characteristics of the cooling regardless of changes in ambient temperature.

The method of controlling a refrigerating apparatus carried out to solve the above problem according to the present invention, illustrated in the accompanying drawings, in which:

figure 1 shows a graphic showing the periods of operation of the heater and the compressor;

figure 2 shows the algorithm of a method of controlling a refrigeration system;

figure 3 shows the conditional cross-section of the refrigeration machine.

The items shown on the drawings, included as a separate positions as follows:

1. Luggage for fresh products;

2. freezer;

3. heater;

4. compressor;

5. the control unit;

6. the temperature sensor;

7. the evaporator.

The refrigeration apparatus according to the present invention includes a camera 1 for fresh food, freezer 2, the compressor 4, which provides compression and circulation of a liquid cooling is Ghent, sensor 6 temperature in chamber 1 for fresh produce, the heating element 3, in the camera 1 for fresh produce, and a control unit 5 that is designed to issue commands and control all elements of the design. The cooling operation is performed on the basis of making the temperature of the camera 1 for fresh produce as a reference. In such a refrigerating apparatus of the heat gain in the camera 1 for fresh produce is quite small at low ambient temperatures. In this case, use the temperature of the camera 1 for fresh produce, and the compressor 4 is re-run by the heater 3, in order to avoid unreasonably long downtime of the compressor 4 and the growth temperature of the freezing chamber 2 to a value greater than the value of the desired temperature. In the process according to the present invention when the heater 3 is determined dynamically depending on the intensity of the compressor 4.

When implementing this method, the duty cycle of the refrigerating apparatus is defined as the period of time from the activation of the compressor 4 to relaunch from outside the state.

In the following text the following notation:

n - number of cycles;

t1nthe time of operation of the compressor 4 in the n-th cycle;

t2nthe time, ZAT is achiveve on restart after a non-operating period of the compressor 4 in the n-th cycle;

t3n- the period of time spent in the n-th cycle after compressor shutdown;

t4n- the operating time of the heater 3 in the n-th cycle;

Wprk (expressed as the percentage of time the compressor is operating) displays the intensity of operation of the compressor 4;

Wprkthe target issue for lighting- a certain constant value representing a target value of the intensity of the compressor, which is determined by the manufacturer as a result of experimental researches;

Wprktimes-the target issue for lighting(n)- target intensity of operation of the compressor 4, which changes dynamically in the n-th cycle,

Wprktimes(n)- instantaneous intensity of the operation of the compressor 4 after shutdown and before turning on the heater 3 in the n-th cycle, and

Wprktimes(n)=t1n/(t1n+t3n);

Wprkfact(n)- the intensity of operation of the compressor 4, implemented during the n-th cycle, and

Wprkfact(n)=t1n/(t1n+t2n);

Δ - constant correction factor, determined by the manufacturer and used to dynamically increase or decrease the value Wprktimes-the target issue for lighting(n)when changing operating conditions and operating characteristics of the refrigeration equipment.

At initial startup of the refrigeration apparatus is Wprktimes-the target issue for lighting(0)equal to the value In PWRC the target issue for lighting. With the exception of this operation, the stages used in the implementation procedures for the management of refrigerating apparatus, are the same in all operating cycles. As an example, below are the steps that are involved in the duty cycle.

In the n-th cycle of the refrigerating apparatus is controlled operation of the compressor 4 and the shutdown of the compressor 4 time t1nhis work is calculated by the control unit 5 at step 102. Then the time t3nspent after stopping of the compressor 4, is defined as the instantaneous value at step 103. The temperature of the camera 1 for fresh produce, as measured by the temperature sensor 6 during these processes, is transmitted to the control unit 5 at step 104. If at step 104 it is established that the temperature of the camera 1 for fresh products exceeds the threshold value specified by the manufacturer, then at step 117 launch of the compressor 4 to work on the stage 118 is Wprktimes-the target issue for lighting(n)equal to the value Wprkthe target issue for lightingand on the stage 201 begins with "n+1"-th operating cycle. If at step 104 it is established that the temperature of the camera 1 for fresh products below the threshold value specified by the manufacturer, then compute the value Wprktimes(n)using values of time t1noperation of the compressor 3 and time t3nspent after stanova compressor 4, and compared at step 106 with the value Wprktimes-the target issue for lighting(n).

If at step 106 it is established that the value Wprktimes(n)more value Wprktimes-the target issue for lighting(n-1)or is it, then, when the intensity of operation of the compressor in the corresponding cycle cooling exceeds the target level Wprktimes-the target issue for lighting(n-1)the heater 3 is not included and ongoing processes from step 101, at which the control unit 5 measures the time t1noperation of the compressor 4.

If at step 106 it is established that the value Wprktimes(n)less than the value Wprktimes-the target issue for lighting(n-1)then, when the target is not reached, the heater 3 is switched on by control unit 5. The temperature of the camera 1 for fresh produce, as measured by the temperature sensor 6 is sent to the control unit 5. After a certain period of time after the heater 3 and the temperature of the camera 1 for fresh produce rises and, as set at step 108, reaches values larger than the threshold value specified by the manufacturer, and then the control unit 5 at step 109 starts the compressor 4, and at step 110 turns off the heater 3. Thus concludes the n-th cooling cycle.

When the compressor 4 starts the next, (n+1)-th operating cycle, at step 111 calculates the time t2nspent on re-launch is ompressor 3 after its stop at the end of the nth cycle. At step 112 computes Wprkfact(n)and at step 113, it is Wprkfact(n)compared with the value Wprkthe target issue for lighting.

If at step 113 found that Wprkfact(n)less than the value Wprkthe target issue for lightingtime t2nspent on re-starting of the compressor 4 after its shutdown, more than the target value, and therefore the time value Wprkfact(n)reduced. For time t2nspent on re-starting of the compressor 4 after its shutdown, the refrigeration apparatus can not perform cooling operation. Therefore it is necessary to reduce the above-mentioned time t2nso that the compressor 4 is included before. For this reason, at the stage 114 is Wprktimes-the target issue for lighting(n)is calculated by adding the values "Δ"specified by the manufacturer, to the value Wprktimes-the target issue for lighting(n-1). In this case, the value Wprktimes-the target issue for lighting(n)increases in the value of the Δand in the next cycle, if necessary, the heater 3 is switched on faster, and the compressor 4 is included before.

If at step 113 it is established that the value Wprkfact(n)more than the value Wprkthe target issue for lightingtime t2nspent on re-starting of the compressor 4 after its stop, is less than the target value, and therefore BP is Menem is Wprk fact(n)increases. When the time t2nspent on re-starting of the compressor 4 after its stop, is reduced, the compressor 4 is longer, which in turn leads to increased energy consumption. Therefore, in order to increase the time t2nand to avoid a greater intensity of operation of the compressor 4 than is necessary, I have to turn the heater 3 later. To this end, at step 115 calculates the value Wprktimes-the target issue for lighting(n)by subtracting the values "Δ"specified by the manufacturer of the values Wprktimes-the target issue for lighting(n-1). In this case, the value Wprktimes-the target issue for lighting(n)reduced by the value of Δand the period when the heater 3 is enabled, lengthened, so that the compressor 4 is started with some delay.

If at step 113, it turns out that the value Wprkfact(n)equal to the value Wprkthe target issue for lightingthe compressor 4 is started with optimal intensity, and the value Wprktimes-the target issue for lighting(n)equal to the value Wprktimes-the target issue for lighting(n-1)at step 116.

1. The method of controlling the cooling unit for refrigerating apparatus, carrying out a cooling operation with the adoption of the temperature of the chamber (1) for fresh produce as a reference, comprising the steps are controlled (step 101) the compressor (4 in the n-th cycle of the refrigerating apparatus, calculate (step 102) time (t1n) compressor (4) after completion of the operation of the compressor and is calculated (step 103) value (t3ntime elapsed after compressor shutdown using block (5) control; transmit the temperature of the chamber (1) for fresh produce, measured by the sensor (6) temperature unit (5) control and, if not installed (step 104), the temperature of the chamber (1) for fresh products exceeds the threshold value specified by the manufacturer, include (step 117), the compressor (4); equal (step 118) the percentage value of the target intensity operation of the compressor (4) in the n-th cycle Wprktimes-the target issue for lighting(n)it is Wprkthe target issue for lightingdisplaying the target intensity operation of the compressor, pre-installed by the manufacturer, and you begin (step 201) n+1-th operating cycle, and if set (step 104), the temperature of the chamber (1) for fresh products is less than the threshold value specified by the manufacturer, is calculated (step 106) the instantaneous value of the target intensity of the compressor after shutdown and before turning on the heater (3) in the n-th cycle Wprktimes(n)using values of time (t1n) compressor (4) and time (t3n), the elapsed after compressor shutdown (4), and compare (step 106) is Wprktimes(n)with the value Wprkthe Remen-target issue for lighting(n-1) in case it is installed (step 106), which is Wprktimes(n)more value Wprktimes-the target issue for lighting(n-1)or equal, returns to the step (step 101), which unit (5) control measure the time (t1n) compressor (4), and if installed (step 106), which is Wprktimes(n)smaller values Wprktimes-the target issue for lighting(n-1), block (5) control enable (step 107) heater (3), while after a certain period of time after switching on the heater (3), when the temperature of the chamber (1) for fresh produce rises and when it is established (step 108)that it reached values exceeding the threshold value specified by the manufacturer, using the block (5) control (step 109) including the compressor (4) and off (step 110) heater (3); calculate (step 111) time (t2nspent on re-start of the compressor (4) after it is shutdown; calculated (step 112) is the intensity of the compressor (4), implemented during the n-th cycle, Wprkfact(n)and compared (step 113) is Wprkfact(n)with the value Wprkthe target issue for lighting; if set (step 113), which is Wprkfact(n)equal to the value Wprkthe target issue for lighting, equate (step 116) the value of the target intensity operation of the compressor (4) in the n-th cycle is iturk times-the target issue for lighting(n)it is Wprktimes-the target issue for lighting(n-1); if set (step 113), which is Wprkfact(n)less than the value Wprkthe target issue for lightingthen added (step 114) Δspecified by the manufacturer, to the value Wprktimes-the target issue for lighting(n-1)and increase the value Wprktimes-the target issue for lighting(n)the value Δproviding more rapid activation of the heater (3) in the next (n+1)-th cycle, which leads to earlier inclusion of the compressor (4); if (step 113), which is Wprkfact(n)more value Wprkthe target issue for lightingthen subtract (step 115) is Δdefined by the manufacturer of the values Wprktimes-the target issue for lighting(n-1)reduce the value Wprktimes-the target issue for lighting(n)the value Δ and provide a slower turning on the heater (3) in the next, (n+1)-th cycle, which leads to the delayed switching on of the compressor (4).

2. The method of controlling the cooling unit for refrigerating apparatus, carrying out a cooling operation with the adoption of the temperature of the chamber (1) for fresh produce as a reference, comprising the steps are calculated (step 102) time (t1n) compressor (4) in the n-th cycle of the refrigeration apparatus; include (stage 107) heater (3) after zatrachivaniya time (t3nin order to receive a temporary C is Uchenie target intensity operation of the compressor Wprk times-the target issue for lighting(n-1)that is dynamically determined through the use of time values (t1n) compressor (4) and time (t3n), the elapsed after the stop of the compressor (4); after a certain period after switching on the heater (3), when the temperature of the chamber (1) for fresh produce grows and when it is established (step 108)that it reached values larger than a threshold determined by the consumer, includes (step 109), the compressor (4) and turn off (step 110) heater (3) through block (5) control; compare (step 113), the intensity of the compressor (4), implemented during the n-th cycle, Wprkfact(n)calculated using time (t1n) compressor operation and time (t2n)spent on re-start of the compressor (4) after his break with the preset target intensity Wprkthe target issue for lightingoperation of the compressor and change the temporary target value Wprktimes-the target issue for lighting(n-1)the intensity of the compressor on the correction factor to calculate the temporary target value Wprktimes-the target issue for lighting(n)the intensity of the compressor for use in the next cycle.

3. The method of controlling a refrigerating apparatus according to claim 2, intended for the refrigeration apparatus, carrying out a cooling operation with the adoption of the temperature of the chamber (1) for fresh produce as a reference, includes stage, which determines (step 114) the value of the target intensity operation of the compressor (4) in the n-th cycle Wprktimes-the target issue for lighting(n)by adding value Δ the correction factor defined by the manufacturer, to the value Wprktimes-the target issue for lighting(n-1)whereupon the heater (3), and hence the compressor (4), will occur first in the next cycle, if at the step of calculating the temporary target value Wprktimes-the target issue for lighting(n)the intensity of the compressor is set (step 113), which is the intensity of the compressor (4), implemented during the n-th cycle, Wprkfact(n)less than the value Wprkthe target issue for lighting.

4. The method of controlling a refrigerating apparatus according to claim 2, intended for the refrigeration apparatus, carrying out a cooling operation with the adoption of the temperature of the chamber (1) for fresh produce as a reference, which includes a stage on which to determine (step 114) the value of the target intensity operation of the compressor (4) in the n-th cycle Wprktimes-the target issue for lighting(n)by subtracting the values Δ the correction factor defined by the manufacturer of the values Wprktimes-the target issue for lighting(n-1)whereupon the heater (3), and hence the compressor (4), we included a delay in the next cycle if set (step 113), the intensity value of the work the compressor is (4), sold during the n-th cycle, Wprkfact(n)greater than the value of Wprkthe target issue for lighting.

5. The method of controlling the refrigeration apparatus according to any one of claims 1 to 4, intended for the refrigeration apparatus, carrying out a cooling operation with the adoption of the temperature of the chamber (1) for fresh produce as a reference, in which the instantaneous value of the target intensity of the compressor after shutdown and before turning on the heater (3) in the n-th cycle Wprktimes(n)calculated by dividing the value of (t1n) for the amount of time a compressor (4) in the n-th cycle and the time spent in the n-th cycle after stopping the compressor, (t1n+t3n).

6. The method of controlling the refrigeration apparatus according to any one of claims 1 to 5, is intended for the refrigeration apparatus, carrying out a cooling operation with the adoption of the temperature of the chamber (1) for fresh produce as a reference, which is the intensity of the compressor (4), implemented during the n-th cycle, Wprkfact(n)calculated by dividing the value of operation time of the compressor (4) in the n-th cycle (t1n) for the amount of time a compressor (4) in the n-th cycle and the time spent on re-start of the compressor (4) after shutdown, (t1n+t2n).



 

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