JP2009216259A - Operating method of refrigerator equipment and refrigerator equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operating method of a refrigerator and refrigerator equipment capable of saving energy by setting standard partial load characteristics and degradation ratios, and calculating the proper power consumption compatible with the change of partial load characteristics by a simple calculation based thereon. <P>SOLUTION: The standard partial load characteristics and degradation ratios of each refrigerator can be set, and the proper power consumption compatible with the change of the partial load characteristics can be calculated by the calculation based thereon. Further with respect to the power consumption, the final power consumption can be easily calculated by calculating tentative power consumption by using the standard partial load characteristics, and then correcting the power consumption on the basis of the degradation ratios. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for operating a refrigerator facility having a plurality of refrigerators.

  In a refrigerator of an air conditioning facility for performing air conditioning of a production facility, cooling of an apparatus, etc., the number control is common in the operation of a plurality of refrigerators. As one of the operation methods to save energy by reducing the power consumption during refrigerator operation, it is optimal by calculating the power consumption for each operation combination using partial load characteristics of the refrigerator and comparing the sum There are methods for determining the combination of the number of operating units and the distribution of the refrigeration load. Since the partial load characteristic of the refrigerator is rated, it varies somewhat depending on individual differences. Further, the partial load characteristic changes due to performance deterioration due to the environmental conditions used over time and the passage of time. Patent Document 1 discloses an example of deriving a partial load characteristic that matches the current situation. The partial load characteristics are obtained by approximating the relationship between the operation load and the power consumption from the operation data for each cooling water inlet temperature.

JP 2007-85601 A

  The method of faithfully determining the partial load characteristics of the refrigerator from the measured operation data is an effective means that can simultaneously incorporate changes in the characteristics of the refrigerator (due to changes over time, etc.). It becomes an important element of accuracy. Specifically, it depends on the amount of operation data over a long period of time, the measurement by temperature, water temperature, flow rate, and other measuring instruments, the accuracy of alternative setting data when there is no measuring instrument, etc. Partial load characteristics are also affected.

  In addition, there are errors in the operation data, and there are some places that can not be used without processing, so for example, if the data is by temperature, the accuracy by group such as totaling in units of 1 ° C or 0.1 ° C. There is a difference. The manufacturer can obtain operating data of power consumption when the refrigeration load is changed over a wide range from 20% to 100% by experiments before shipping, but the data distribution will be biased when it becomes actual operating results data, A load range that cannot be approximated without guessing the secular change will occur. Furthermore, in the actual operating state, the cooling water inlet temperature is also uneven within a narrow range, and therefore it may not be possible to approximate every wide range of cooling water inlet temperature.

  For this reason, the partial load characteristics approximated from the measured data may not be suitable for use in some cases, and even if you want to make some corrections, the data correction is based on the actual operation data. This is not easy and may hinder driving. From the above, if it is difficult to calculate the partial load characteristics by approximating the operation data, it is easy to deal with the partial load characteristics of the specifications of the refrigerator or to correct the partial load characteristics approximated from the operation data It is hoped that

  In view of the above-described conventional problems, the present invention calculates appropriate power consumption corresponding to a change in partial load characteristics by setting standard (first) partial load characteristics and deterioration rate and performing simple calculations based on these settings. By this, the operating method and refrigerator equipment of the refrigerator which saved energy are provided.

  The present invention relates to a standard partial load characteristic of each refrigerator in the operation method of the refrigerator that controls the operation capacity allocated to each refrigerator so that the total power consumption of the plurality of refrigerators in the refrigerator equipment is reduced. A first step of setting a deterioration rate adapted to this characteristic, a second step of setting a refrigeration capacity of a load in an air conditioning facility, and a plurality of operation combinations of the refrigerators satisfying the refrigeration capacity of the load, From the third step of calculating the power consumption based on the partial load characteristics and the deterioration rate, and the fourth step of setting the operating capacity allocated to each refrigerator in the operation combination in which the power consumption calculated above becomes smaller It is characterized by becoming.

  In the third step, temporary power consumption is calculated based on the standard partial load characteristics of each refrigerator, and the final power consumption is calculated by correcting the power consumption by the deterioration rate. And

  The second step is characterized in that a standard partial load characteristic of each refrigerator and a deterioration rate representing aged deterioration of the same refrigerator are set.

  The deterioration rate is a deterioration rate with respect to a standard partial load characteristic of each refrigerator.

  Further, it is characterized in that different deterioration rates can be prepared and applied to the calculation for the standard partial load characteristics of the refrigerator expressed for each cooling water inlet temperature.

  The standard partial load characteristic is either a standard partial load characteristic of a refrigerator specification or a partial load characteristic generated by approximation from actually measured operation data.

  In addition, the deterioration rate is characterized in that it is either an index obtained from the refrigerator specification or a value obtained from the results of secular change.

  Furthermore, the present invention includes a refrigerator unit including a plurality of refrigerators, an operation control unit that controls the operation of each refrigerator, and a load unit, and the operation control unit sums the power consumption of the plurality of refrigerators. In the refrigeration equipment that operates by assigning the operation capacity to each refrigerator so as to reduce the operating capacity, the operation control unit adapts to each partial load characteristic, a memory that stores a standard partial load characteristic of each refrigerator A memory for storing a deterioration rate, a power consumption calculation unit that calculates power consumption based on the standard partial load characteristics and the deterioration rate for a plurality of operation combinations of the refrigerator, and the calculated power consumption is smaller A capacity setting unit for setting the operating capacity assigned to each refrigerator in the operation combination is provided.

  The power consumption calculation unit calculates temporary power consumption based on the standard partial load characteristics of each refrigerator, and calculates the final power consumption by correcting the power consumption by the deterioration rate. Features.

  According to the present invention, it is possible to easily calculate appropriate power consumption corresponding to a change in the partial load characteristics by setting the standard partial load characteristics and the deterioration rate of each refrigerator and calculating based on these. In addition, as for power consumption, provisional power consumption is calculated using standard partial load characteristics, and correction is made to the power consumption by the deterioration rate, so that the final power consumption can be calculated very easily. In other words, the standard partial load characteristics are modified according to changes over time, and new partial load characteristics are calculated as approximate expressions, and when calculating power consumption, there are operations for calculating a number of approximate expressions for each temperature. Necessary and inefficient.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a refrigerator equipment as an embodiment of the present invention, FIG. 2 is a diagram showing an example of partial load characteristics with degraded performance of the refrigerator in the equipment of FIG. 1, and FIG. 3 is a refrigerator of FIG. FIG. 4 is an operation flow of the refrigeration equipment when the deterioration rate is applied to the partial load characteristics of the machine.

In FIG. 1, 100 is a refrigerator facility, 1 is a refrigerator unit comprising a plurality of refrigerators R1, R2 _, ..., Rn, 2 is an operation control unit that controls the operation of the refrigerator unit 1, and 3 is The load unit of the air conditioner 5 or the like, 4 is a cold water tank, 6 is a first temperature / flow rate monitoring point, and 7 is a second temperature monitoring point. T 1 is the temperature of the cold water at the first temperature / flow rate monitoring point 6, and Q ₁ is the amount of cold water delivered at the first temperature / flow rate monitoring point 6.

  The refrigerator unit 1 is configured so that each of the refrigerators R1,. Then, the refrigerant is cooled by the refrigerant while being circulated with the refrigerator 4. In the above configuration, each of the refrigerators R1, R2,..., Rn of the refrigerator unit 1 is controlled by the operation control unit 2, and predetermined conditions, that is, a predetermined refrigeration capacity, a predetermined drive motor input, a predetermined consumption Operating conditions such as electric power.

  Each of the refrigerators R1,..., Rn of the refrigerator unit 1 operated under the operating conditions pumps a part of the water on the high-temperature tank side in the cold water tank 4, and converts the pumped water into a refrigerating capacity by the refrigerant. Correspondingly, it is cooled and returned to the cold / warm tank side in the cold water tank 4 again. This is repeated. At the first temperature / flow rate monitoring point 6, the temperature T1 of the cold water and the amount Q1 of water are detected. At the second temperature monitoring point 7, the return temperature T2 of the cold water is detected. Both the temperature at the first temperature / flow rate monitoring point 6 and the detection result of the water supply amount and the information on the return temperature of the cold water at the second temperature monitoring point 7 are input to the operation control unit 2.

  The operation control unit 2 includes a memory 2a that stores a plurality of standard (initial) partial load characteristics for each cooling water temperature. As this partial load characteristic, a standard partial load characteristic shown in a refrigerator specification prepared in advance by a manufacturer or a partial load characteristic obtained from operation data widely measured in the first operation is used as a standard. A memory 2b stores a deterioration rate α (α1, α2,... Corresponding to each partial load characteristic). As the deterioration rate alpha, an index indicated in a refrigerator specification prepared in advance by a manufacturer, or a deterioration rate (power consumption increase rate) based on empirically obtained results of aging is used. Further, the deterioration rate may be set to be uniform (identical) for each partial load characteristic, in addition to α1, α2,... Corresponding to each partial load characteristic as described above.

  Reference numeral 2c denotes a refrigeration load setting unit in which the refrigeration capacity, the outside air temperature, and the cooling water inlet temperature (monitoring point 6) required by the load unit 3 are set. 2d is a power consumption calculation unit that distributes loads (operating capacities) to a plurality of refrigerators that are operated to satisfy the refrigeration capacity set above, and approximates the standard partial load characteristics of each refrigerator based on this distribution Temporary power consumption is calculated from the equation, and then the temporary power consumption is corrected with the deterioration rate and added up for each refrigerator to calculate the final power consumption. The final power consumption is calculated for all combinations of the number of operating refrigerators.

  2e is a capacity setting unit that evaluates the final power consumption of all the combinations calculated above, determines the combination of refrigerators with the minimum power consumption, and is assigned to each refrigerator in this combination Set the operating capacity as the operating capacity during operation.

  Next, the deterioration of the partial load characteristic will be described. As shown in FIG. 2, it is empirically known that the first (standard) partial load characteristic indicated by the solid line has a shape indicated by a broken line moved in the upper left direction due to aging (deterioration) of the refrigerator. Yes. That is, the performance of the refrigerator deteriorates due to secular change, and the power consumption increases. FIG. 3 shows a calculation example of power consumption when the deterioration rate is applied to the first (standard) partial load characteristic. In the present embodiment, a deterioration rate indicating a ratio when compared with a standard partial load characteristic is introduced as a scale representing the secular change (deterioration) of the refrigerator. That is, instead of obtaining the partial load characteristics of the refrigerator after aging from the standard partial load characteristics as an approximate expression, so that it is the same as the result calculated using the approximate expression of the partial load characteristics after aging, Calculation using standard partial load characteristic approximation and deterioration rate. The calculation is performed as follows.

x: Load factor (%)
α: Deterioration rate (%)
Y ₀ : Temporary power consumption with standard partial load characteristics Y: Power consumption when considering the deterioration rate Y = Y ₀ + Y ₀ * (α / 100) * (X / 100)
In the above calculation, to calculate the power Y ₀ provisional approximation equation of the standard part load characteristics, in addition the power consumption which is increased by deterioration rate α to the power consumption, and calculates the final power Y of. According to this calculation method, only the standard partial load characteristic is used as an approximate expression, and the result can be substantially the same as the result calculated using the approximate expression of the partial load characteristic after aging.

  As in the past, the method for obtaining the partial load characteristics after aging from the measured operation data, that is, the method for obtaining the partial load characteristics of the refrigerator after the aging as an approximate expression is the partial load characteristics for each cooling water temperature. The approximate expression is periodically calculated, and much time is required for the calculation operation alone.

  According to the present embodiment, the first (standard) partial load characteristic and the deterioration rate may be prepared as the partial load characteristic, and only the deterioration rate may be updated periodically. Therefore, it is not necessary to newly calculate the partial load characteristic according to the secular change, so that the power consumption calculation efficiency is greatly improved.

The preparatory operation before the operation of the refrigerator equipment 100 will be described with reference to FIG.
(1) In the first step, the operation control unit 2 sets and stores a standard partial load characteristic approximate expression in the memory 2a, and sets and stores a correction ratio (deterioration rate) α in the memory 2b (FIG. 4). Step 402). Here, the deterioration rate α may be the same value common to the standard partial load characteristics for each cooling water temperature, or may be different values (α1, α2,...) For the standard partial load characteristics. The different values correspond to the case where the degree of aging of the refrigerator varies depending on the cooling water temperature.

  (2) Next, in the second step, the refrigeration load setting unit 2c sets conditions necessary for calculating the refrigeration capacity, the outside air temperature, the cooling water inlet temperature, etc. required by the load unit 3 (step of FIG. 4). S403).

(3) Next, in the third step, the power consumption calculation unit 2d allocates loads (operating capacities) to a plurality of refrigerators that are operated to satisfy the refrigeration capacity set above, and each refrigeration based on this distribution calculating the power Y ₀ provisional from the approximate equation of the standard partial load characteristic of the machine, and then by adding the correction in deterioration rate α to the power consumption Y ₀ of the temporary, final sum by summing for each refrigerator The power consumption Y is calculated. The final power consumption Y is calculated for all combinations of the number of operating refrigerators. For example, if there are seven refrigerators, there are 128 combinations of 2 7. The distribution of the refrigeration load to each refrigerator that is operated in the calculation is performed in proportion to the rated capacity of the refrigerator. Refrigerator obtains power consumption Y ₀ provisional from the approximate equation of partial load characteristics of the cooling water inlet temperature and was allocated refrigeration load. The final power consumption Y is calculated from the deterioration rate by the calculation formula shown in FIG. 3 (step S404 in FIG. 4).

  (4) Next, in the fourth step, the capacity setting unit 2e evaluates and compares the total power consumption for each operation combination of the refrigerators, and determines the combination of refrigerator operations that minimizes the total. The refrigeration capacity allocated to each refrigerator during the combination of the refrigerator operations is set for each refrigerator during operation (step S405 in FIG. 4). In step S405, the preparatory work for the operation is completed, and thereafter, each refrigerator having the refrigeration capacity is operated to perform an energy saving operation.

It is a whole lineblock diagram of the freezing equipment of the example of the present invention. It is explanatory drawing of the performance degradation of the partial load characteristic of a refrigerator. It is explanatory drawing when a deterioration rate is applied to the partial load characteristic of a refrigerator. It is an operation | movement flowchart of refrigerator equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Refrigerator part, 2 ... Operation control part, 2a ... Memory which memorize | stores a standard partial load characteristic, 2b ... Memory which memorize | stores deterioration rate, 2c ... Cooling load setting part, 2d ... Power consumption calculation part, 2e ... Capacity Setting unit, 3 ... load unit, 4 ... cold water tank, 5 ... air conditioner, 6 ... first temperature / water supply monitoring point, 7 ... second temperature monitoring point, 100 ... refrigerator equipment, R1, R2, Rn ... refrigerator, Y 0 _... power consumption of provisional, Y ... final power consumption, α ... deterioration rate.

Claims (9)

In the operation method of the refrigerator equipment for controlling the operation capacity allocated to each refrigerator so that the total power consumption of the plurality of refrigerators in the refrigerator equipment is reduced,
A first step of setting a standard partial load characteristic of each refrigerator and a deterioration rate adapted to the characteristic;
A second step of setting the refrigeration capacity of the load in the air conditioning facility;
A third step of calculating power consumption based on the standard partial load characteristics and the deterioration rate for a plurality of operation combinations of the refrigerators satisfying the refrigeration capacity of the load;
A method for operating a refrigerator apparatus, comprising a fourth step of setting an operation capacity allocated to each refrigerator in an operation combination in which the power consumption calculated above is smaller. The operation method of the refrigerator equipment according to claim 1,
In the third step, temporary power consumption is calculated based on standard partial load characteristics of each refrigerator, and final power consumption is calculated by correcting the power consumption with a deterioration rate. How to operate the refrigerator equipment. In the operating method of the refrigerator equipment of Claim 1 or 2,
In the second step, a standard partial load characteristic of each refrigerator and a deterioration rate representing aged deterioration of the same refrigerator are set. The operation method of the refrigerator equipment according to claim 3,
The deterioration rate is a deterioration rate with respect to a standard partial load characteristic of each refrigerator, and the operation method of the refrigerator equipment characterized by the above. In the operating method of the refrigerator equipment of Claim 1 or 2,
A method of operating a refrigerator facility, characterized in that a different deterioration rate can be prepared and applied to calculation with respect to a standard partial load characteristic of a refrigerator expressed for each cooling water inlet temperature. The operation method of the refrigerator equipment according to claim 3,
The standard partial load characteristic is either a partial load characteristic of a refrigerator specification or a partial load characteristic generated by approximation from measured operation data. In the operating method of the refrigerator equipment of Claim 1 or 2,
The deterioration rate is either an index obtained from the refrigerator specifications or a value obtained from the results of secular change. A refrigerator unit having a plurality of refrigerators, an operation control unit for controlling the operation of each refrigerator, and a load unit, so that the total power consumption of the plurality of refrigerators is reduced by the operation control unit. In the refrigerator equipment that operates by assigning the operating capacity to each refrigerator,
The operation control unit includes a memory for storing a standard partial load characteristic of each refrigerator, a memory for storing a deterioration rate adapted to each partial load characteristic, and the partial loads for a plurality of operation combinations of the refrigerators. A power consumption calculation unit that calculates power consumption based on characteristics and a deterioration rate, and a capacity setting unit that sets an operation capacity allocated to each refrigerator in an operation combination in which the calculated power consumption is smaller. Features freezer equipment. In the refrigerator equipment according to claim 8,
The power consumption calculation unit calculates temporary power consumption based on standard partial load characteristics of each refrigerator, and calculates final power consumption by correcting the power consumption with a deterioration rate. Refrigerator equipment to do.

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