JP5938724B2 - Refrigerated refrigeration air conditioner - Google Patents

Description

  The present invention relates to a refrigeration / freezing air-conditioning apparatus including a refrigeration / freezing showcase device for cooling the inside of a showcase installed in a store and an air conditioner for air-conditioning the inside of the store.

  Conventionally, in a store of a supermarket, a convenience store or the like, a plurality of showcases are installed to display products while cooling products such as food. The evaporator of each showcase constitutes a refrigerant circuit of a stand-alone refrigerator and a refrigerated refrigerator showcase device, and receives the supply of refrigerant from the refrigerator to cool the interior. In addition, an indoor unit of an air conditioner is installed on the ceiling or the like in the store, and the store is supplied with refrigerant from an outdoor unit that constitutes the refrigerant circuit to perform air conditioning in the store. And the refrigerant circuit of these refrigeration freezing showcase apparatuses and an air conditioner was comprised independently, respectively (for example, refer patent document 1).

  Here, it is known that the COP of the air conditioner (the value (coefficient of performance) indicating the cooling / heating ability with respect to 1 kW of power consumption) is higher than the COP of the refrigerated freezer showcase device (for example, the refrigerated freezer showcase). The COP of the device is 2, and the COP of the air conditioner is 3-4). Therefore, when the total load of the refrigerated freezer showcase device and the load of the air conditioner is the same, the larger proportion of the load of the air conditioner is the overall (refrigerated freezer showcase device and air conditioner B) Power consumption is reduced. On the other hand, the loads on the refrigerated showcase device and the air conditioner vary depending on the temperature in the store, and the temperature in the store varies depending on the outside air temperature.

  FIG. 2 is a diagram showing this state. In this figure, the hatched portion indicates the load of the refrigerated freezer showcase device (total of separate showcase cooling loads), the dot portion indicates the load of the air conditioner (total air conditioning load), and the triangle indicates the refrigerated freezer showcase device and air conditioner. The total power consumption (power system power) of the machine is shown. At different times A and B, the total load of the refrigerated showcase device and the air conditioner was the same, but at time A, the load (dot) of the air conditioner was the load of the refrigerated showcase device (hatching). However, at time B, when both loads were almost equal, the total power consumption (triangle) was lower at time B than at time A. That is, the total operating efficiency of the refrigerated freezer showcase device and the air conditioner was improved at time B than at time A.

  Therefore, in Patent Document 1, when the load of the refrigerated freezer showcase device increases, the temperature in the store is lowered by increasing the load of the air conditioner by increasing the number of rotations of the compressor of the air conditioner with better operating efficiency. To save energy.

JP 2004-205194 A

  However, increasing the load on the air conditioner to reduce power consumption increases the number of rotations of the compressor, causing the temperature in the store to be too cold and causing discomfort to the customer. was there.

  The present invention is made in order to solve the conventional technical problems, and the store is air-conditioned in an ideal state, and the total power consumption of the refrigerated showcase device and the air conditioner is also obtained. An object of the present invention is to provide a refrigerated refrigerating and air-conditioning apparatus that can be suppressed.

The refrigerated refrigerating and air-conditioning apparatus of the present invention includes a refrigerated freezer showcase device provided with a refrigerant circuit that cools the interior of a showcase installed in a store, and a refrigerant circuit independent of the refrigerated freezer showcase device. In a refrigerated refrigerating and air-conditioning apparatus comprising an air conditioner that air-conditions a store, and a control device that controls the operation of the refrigerated freezer showcase device and the air conditioner, the control device includes a load of the refrigerated freezer showcase device Storage means for storing data relating to an optimum load ratio, which is an ideal ratio of the load of the air conditioner, data collecting means for collecting data relating to operating states of the refrigerated freezer showcase device and the air conditioner, and the data The load of the refrigerated showcase device and the load of the air conditioner are calculated from the data collected by the collecting means, and the calculated load is a ratio thereof A load ratio calculating means for calculating a slip, to determine the difference between the optimum load ratio and the calculated load ratio, determining means for the calculation load ratio to control the operation of the air conditioner in the direction in which the optimum load ratio The control device includes an outside air temperature detecting means for detecting an outside air temperature, the storage means holds the optimum load ratio for each outside air temperature, and the data collecting means detects the outside air temperature. The outside air temperature detected by the means is also collected, and the judging means adds correction to the control of the operation of the air conditioner based on the change state of the outside air temperature detected by the outside air temperature detecting means,
The determination means is configured such that when the load ratio of the air conditioner calculated by the calculated load ratio is smaller than the ideal load ratio of the air conditioner in the optimal load ratio and the outside air temperature does not change, the air When the load on the air conditioner is increased and the outside air temperature tends to increase, the operation of the air conditioner is controlled in a direction to further increase the load on the air conditioner, and the outside air temperature tends to decrease Control for changing the load of the air conditioner is not performed .

In the refrigerated refrigerating and air-conditioning apparatus according to the second aspect of the present invention, in the above invention, the judging means is configured such that the ratio of the air conditioner load calculated in the calculated load ratio is the same as the ideal air conditioner load ratio in the optimum load ratio If the outside air temperature is increasing, the load on the air conditioner is increased, and if there is no change in the outside air temperature, the control for changing the load on the air conditioner is not performed, and the outside air temperature is decreasing. The operation of the air conditioner is controlled in a direction to reduce the load of the air conditioner.

The refrigeration / refrigeration / air-conditioning apparatus of the invention of claim 3 is the refrigeration / refrigeration / air-conditioning apparatus according to claim 3, wherein the determination means in the invention according to claim 3, wherein the load ratio of the air conditioner by calculation in the calculated load ratio When the outside air temperature is higher than the ideal air conditioner load ratio in the optimum load ratio and the outside air temperature tends to rise, no control is performed to change the load of the air conditioner. When the outside air temperature is in a downward trend, the operation of the air conditioner is controlled in a direction to further reduce the load of the air conditioner.

According to the present invention, a refrigerated freezer showcase device provided with a refrigerant circuit for cooling the inside of a showcase installed in the store, and a refrigerant circuit independent of the refrigerated freezer showcase device are provided to air-condition the inside of the store. In a refrigerated refrigeration air conditioner comprising an air conditioner and a control device that controls the operation of the refrigerated refrigeration showcase device and the air conditioner, the control device includes a load of the refrigerated refrigeration showcase device and a load of the air conditioner. Storage means for storing data relating to the optimum load ratio, which is an ideal ratio, data collection means for collecting data relating to the operating state of the refrigerated freezer showcase device and the air conditioner, and refrigeration from the data collected by the data collection means A load ratio calculating means for calculating a load of the refrigeration showcase device and a load of the air conditioner, and calculating a calculated load ratio that is a ratio thereof; Determining the difference between the load rate and the optimum load ratio, calculated the load ratio and a determination means for controlling the operation of the air conditioner in the direction in which the optimum load ratio, the refrigerated showcase device load and the air conditioner It is possible to always maintain the load ratio at an ideal ratio.

  This makes it possible to suppress the total power consumption of the refrigerated freezer showcase device and the air conditioner while air-conditioning the store in an ideal state.

Further, the control device includes an outside air temperature detecting means for detecting the outside air temperature, the storage means holds the optimum load ratio for each outside air temperature, and the data collecting means also collects the outside air temperature detected by the outside air temperature detecting means. The judgment means corrects the control of the operation of the air conditioner based on the change state of the outside air temperature detected by the outside air temperature detection means. If the load ratio is smaller than the ideal air conditioner load ratio at the optimum load ratio and the outside air temperature does not change, the load on the air conditioner is increased, and if the outside air temperature is increasing, the air conditioner Control the operation of the air conditioner in a direction that further increases the load on the air conditioner, and if the outside air temperature is decreasing, control is not performed to change the load on the air conditioner. The stage realizes more accurate operation control of the air conditioner that accurately considers the influence of the outside air temperature on the load of the refrigerated showcase device and the air conditioner, and consumes while maintaining the air conditioning in the store in a more favorable state It is possible to reduce the amount of electric power.

Further, if the determination means adds correction to the control of the operation of the air conditioner as in the invention of claim 2 or claim 3 based on the state of change in the outside air temperature detected by the outside air temperature detection means, Judgment means realizes operation control of the air conditioner that accurately considers the influence of the outside air temperature on the load of the refrigerated freezer showcase device and the air conditioner, and maintains the air conditioning in the store in a more favorable state while consuming power It is possible to achieve a reduction in the amount of energy.

It is a block diagram of the refrigeration freezing air conditioner of one Example to which this invention is applied. It is a figure explaining the change of the total electric power consumption by the ratio of the load of a refrigerated freezer showcase apparatus and the load of an air conditioner. It is a figure which shows the optimal load ratio corresponding to external temperature. It is a figure which shows the calculation timing of the calculation load ratio which the controller of FIG. 1 performs. It is a flowchart explaining operation | movement of the controller of FIG. 2 is a flowchart for explaining the operation of the controller in FIG. 1. 2 is a flowchart for explaining the operation of the controller in FIG. 1. 2 is a flowchart for explaining the operation of the controller in FIG. 1.

  Hereinafter, embodiments of the present invention will be described in detail. In FIG. 1, the refrigeration / refrigeration / air-conditioning apparatus 1 of the embodiment cools the interior of a showcase (1 to i) 4 that is an open showcase installed in a store 3 of a store 2 such as a supermarket or a convenience store. Refrigerated freezer showcase device 6 and air conditioner 8 for air-conditioning store 3 by a plurality of air conditioner indoor units 7 provided on the ceiling of store 3 or the like. A controller 9 is provided as a control device that centrally controls both the device 6 and the air conditioner 8 in a coordinated manner.

  The refrigerated freezer showcase device 6 includes a refrigerator 11 installed outside the store and the showcase 4. The refrigerator 11 is provided with a compressor and a condenser (radiator) (not shown), and each showcase 4 is provided with an evaporator and a decompression device (not shown) for cooling the interior of the display where products such as food are cooled. These compressors, condensers, decompressors and evaporators (the evaporators of each showcase 4 are connected in parallel) are connected by refrigerant piping to form a known refrigerant circuit 12. Then, the refrigerant compressed by the compressor of the refrigerator 11 is radiated to the evaporator of each showcase 4 by the condenser, depressurized by the decompression device, and then distributed and supplied, whereby the warehouse of each showcase 4 is stored. The inside is cooled to a predetermined internal set temperature. Each showcase is provided with a not-shown internal temperature / humidity sensor for detecting the internal temperature and humidity.

  The air conditioner 8 includes an air conditioner outdoor unit 13 installed outside the store and the air conditioner indoor unit 7. The air conditioner outdoor unit 13 is provided with a compressor and a heat source side heat exchanger (not shown), and the air conditioner indoor unit 7 is provided with a use side heat exchanger (not shown) for air-conditioning the inside 3 of the store. The side heat exchanger and the use side heat exchanger are connected together with a decompression device (not shown) through a refrigerant pipe to form a known refrigerant circuit 14. That is, the refrigerant circuit 14 of the air conditioner 8 and the refrigerant circuit 12 of the refrigerated freezer showcase device 6 are independent. And the refrigerant | coolant compressed with the compressor of the air-conditioning outdoor unit 13 is supplied to the use side heat exchanger of the air-conditioning indoor unit 7, and the air in the store 3 is sucked into the use-side heat exchanger, and after the heat exchange, As a result, the in-store 3 is air-conditioned to a predetermined air-conditioning set temperature. The air conditioning indoor unit 7 is provided with a suction and blowout temperature / humidity sensor (not shown) that detects the temperature and humidity of the suction air and the blowout air.

  The store 3 is provided with an in-store temperature / humidity sensor 19 for detecting the temperature and humidity of the air in the store. Further, outside air temperature sensor 21 for detecting outside air temperature is also provided outside the store. The showcase 4, the air-conditioning indoor unit 7, the air-conditioning outdoor unit 13, the in-store temperature / humidity sensor 19 and the outside air temperature sensor 21 are connected to the controller 9 via a communication line or the like to transmit and receive data. That is, the air conditioning indoor unit 7 transmits data related to the suction / blowout temperature / humidity and the air volume to the controller 9, and each showcase 4 transmits data related to the internal temperature / humidity to the controller 9.

  Further, the outside temperature sensor 21 transmits data related to the outside temperature to the controller 9. Further, data relating to the temperature and humidity of the air in the store 3 is transmitted from the in-store temperature / humidity sensor 19 to the controller 9, and data relating to the operation status of devices such as a compressor is transmitted from the air-conditioning outdoor unit 13 to the controller 9. Furthermore, the controller 9 transmits data related to the result of the operation change control of a device such as a compressor to the air conditioning outdoor unit 13.

  The controller 9 (control device) is composed of a general-purpose microcomputer, a memory, a hard disk, and the like, and functions as a data collection unit 16 as data collection means, and load ratio calculation as load ratio calculation means and determination means. -It has the judgment part 17 and the database 18 as a memory | storage means.

  The database 18 of the controller 9 includes the air conditioner 8 at an optimum load ratio that is an ideal ratio of the load of the refrigerated freezer showcase device 6 (showcase load Qsc) and the load of the air conditioner 8 (air conditioning load Qac). As the load ratio, data relating to an ideal ratio of the air conditioning load Qac to the total of the showcase load Qsc and the air conditioning load Qac (optimum air conditioning load ratio Racb) is measured and stored in advance. As a method for measuring the optimum air conditioning load ratio Racb, for example, as shown in FIG. 3, it is conceivable to create a relational graph between the outside air temperature and the load ratio using data actually measured in the store 2 and obtain a regression equation.

  That is, in FIG. 3, the vertical axis represents the load ratio, and the cross mark represents the showcase load ratio Rsc = Qsc / (Qsc + Qac) actually measured and calculated in the store 2 in correspondence with the outside air temperature (horizontal axis). It is a thing. The broken line in FIG. 3 is the cross-regression equation. Further, the circle marks indicate that the air conditioning load ratio Rac = Qac / (Qsc + Qac) as the ratio of the load of the air conditioner 8 in the calculated load ratio actually measured and calculated in the store 2 corresponds to the outside air temperature (horizontal axis). And plotted. The solid line in FIG. 3 is the regression equation of this circle, and this is the data of the optimum air conditioning load ratio Racb with respect to the outside air temperature, and is held in the database 18.

  Here, if the outside air temperature becomes high, the air in the store 3 is also affected and becomes high, so the air load Qac increases. Accordingly, the circle mark (air conditioning load ratio Rac) in FIG. 3 tends to go up as the outside air temperature increases, and conversely, the cross mark (showcase load ratio Rsc) tends to go down. As shown in FIG. 3, variation occurs due to fluctuations in the input status of the customer and the customer visit status.

  For example, when a large amount of normal temperature beverages (commodities) is put into the showcase 4, the showcase load Qsc increases, so the showcase load ratio Rsc increases, and the refrigerated freezer showcase device 6 and the air conditioner as described above. The total operating efficiency of the machine 8 is reduced. In that case, if the air conditioning load ratio Rac is increased by lowering the air conditioning set temperature and increasing the air conditioning load Qac, the operating efficiency is improved (in this case, the cooling effect of the air conditioner 8 is the storage of the showcase 4). It will also contribute to the internal cooling).

  However, if the air conditioning set temperature is simply lowered to increase the air conditioning load Qac, the air temperature in the store 3 will be too cold, resulting in discomfort to the customer. On the other hand, the regression equations are optimum values excluding these variations, and the solid regression equation is the optimum air conditioning load ratio Racb. Then, the air conditioner 8 is adjusted so that the air conditioning load ratio Rac (the ratio of the load of the air conditioner 8 in the calculated load ratio) becomes the optimum air conditioning load ratio Racb (the ratio of the load of the air conditioner 8 in the optimal load ratio). By controlling, it can be expected to comfortably air-condition the store 3 while preventing a decrease in driving efficiency.

  Therefore, the controller 9 executes the control described below. Next, control of the air conditioner 8 by the controller 9 will be described with reference to FIGS. In step S1 of FIG. 5, the data collection unit 16 of the controller 9 receives data on the suction / blowout temperature / humidity and air volume from the air conditioning indoor unit 7, data on the internal temperature / humidity from each showcase 4, and the outside air temperature sensor. Data relating to the outside air temperature is collected from 21, and further data relating to the temperature and humidity of the air in the store 3 is collected from the store temperature and humidity sensor 19.

  Next, in step S2, it is determined whether or not it is the ratio calculation timing using a timer that the self has as a function. The following steps are executed by the load ratio calculation / determination unit 17 of the controller 9. Here, the rate calculation timing is set to once every 10 minutes (predetermined time) in the embodiment as shown in FIG. In addition, the average value of the data for 10 minutes is calculated for each of the above data and used for calculation of the load ratio in the next step S3. In step S3, the air conditioning load Qac, the showcase load Qsc, and the air conditioning load ratio Rac are calculated from each data (average value) collected in step S1 (1).

Their formula is
Qac = (Hout−Hin) × F × ρ
Where Qac is the air conditioning load, Hin is the enthalpy of the intake air of the air conditioning indoor unit, Hout is the enthalpy of the blown air of the air conditioning indoor unit, F is the amount of blown air, and ρ is the air density.

Qsc = Qscbase × (Hnow-Hsc) / (Hbase-Hsc)
However, Qsc: Showcase load, Hbase: Rated in-store enthalpy (environmental enthalpy when the showcase exhibits the required refrigeration capacity Qscbase), Hnow: In-store air enthalpy, Hsc: In-store air (cold air) enthalpy, Qscbase: The required refrigeration capacity (for example, the refrigeration capacity of a showcase when the ambient temperature is 26 ° C. and the humidity is 70%).

Rac = Qac / (Qac + Qsc)
However, Rac: air conditioning load ratio (calculated load ratio).

  Next, the process proceeds to step S4, and the optimum air conditioning load ratio Racb corresponding to the average outside air temperature for 10 minutes is extracted from the optimum air conditioning load ratio Racb stored in the database 18, and the process proceeds to step S5 and proceeds to step S3. The difference (Rac−Racb) from the calculated air conditioning load ratio Rac (1) is calculated (compared) to determine the difference between the two.

  If the air conditioning load ratio Rac is the same as the optimum air conditioning load ratio Racb in step S5, the process proceeds to “a”. The flowchart of “a” is shown in FIG. In the case of “a”, the process proceeds from step S5 to step S6, and the difference between the average outside air temperature for 10 minutes and the current outside air temperature (average−current) is obtained. If the difference is within a predetermined predetermined value, that is, if the outside air temperature is not substantially changed (others), the process proceeds to step S8 and the current state is maintained. That is, when the air conditioning load ratio Rac is the same as the optimum air conditioning load ratio Racb and there is no change in the outside air temperature, the operation change control of the air conditioner 8 is not performed.

  On the other hand, if the average outside air temperature minus the current outside air temperature is negative and the absolute value is equal to or higher than the specified value, that is, if the current outside air temperature is increasing, the process proceeds to step S7 and air conditioning of the air conditioner 8 is performed. The set temperature is decreased by one step and transmitted to the air-conditioning outdoor unit 13 as data relating to the device operation change result. As a result, the air conditioning load Qac increases. Here, when the outside air temperature tends to rise, it is considered that the air temperature in the store 3 does not drop too much even if the air conditioning set temperature is lowered. Therefore, when the air conditioning load ratio Rac is substantially the same as the optimum air conditioning load ratio Racb and the outside air temperature is increasing, the air conditioner 8 is controlled to increase the air conditioning load Qac of the air conditioner 8. Correction is added, the air conditioning load ratio Rac is increased, and the total operation efficiency of the air conditioner 8 and the refrigerated freezer showcase device 6 is improved.

  On the other hand, if the average outside air temperature—the current outside air temperature is positive and the positive value is greater than or equal to the specified value, that is, if the current outside air temperature is in a downward trend, the process proceeds to step S9 and the air conditioner 8 is air-conditioned. The set temperature is increased by one step and transmitted to the air conditioning outdoor unit 13 as data relating to the device operation change result. As a result, the air conditioning load Qac decreases. Here, when the outside air temperature tends to decrease, it is necessary to prevent the air temperature in the store 3 from excessively decreasing by increasing the air conditioning set temperature. Therefore, when the air conditioning load ratio Rac is substantially the same as the optimum air conditioning load ratio Racb and the outside air temperature tends to decrease, the air conditioner 8 is controlled in the direction of decreasing the air conditioning load Qac of the air conditioner 8. A correction is applied to prevent the air temperature in the store 3 from being too cold.

  Next, in step S5, if the air conditioning load ratio Rac−optimum air conditioning load ratio Racb is negative, that is, if the air conditioning load ratio Rac is smaller than the optimal air conditioning load ratio Racb, the process proceeds to “b”. The flowchart of “b” is shown in FIG. In the case of “b”, the process proceeds from step S5 to step S10, and the difference between the average outside air temperature for 10 minutes and the current outside air temperature (average−current) is obtained. If the difference is within the upper and lower specified values and there is substantially no change in the outside air temperature (others), the process proceeds to step S12, where the air conditioning set temperature of the air conditioner 8 is decreased by one step, and data relating to the device operation change result It transmits to the air-conditioning outdoor unit 13. As a result, the air conditioning load Qac increases. That is, when the air conditioning load ratio Rac is smaller than the optimum air conditioning load ratio Racb and the outside air temperature is substantially the same, the control of the air conditioner 8 in the direction of increasing the air conditioning load Qac of the air conditioner 8 is performed. Is added to increase the air conditioning load ratio Rac and approach the optimum air conditioning load ratio Racb, thereby improving the total operating efficiency of the air conditioner 8 and the refrigerated freezer showcase device 6.

  On the other hand, when the average outside air temperature minus the current outside air temperature is negative and the absolute value is equal to or higher than the specified value, that is, when the current outside air temperature is increasing, the process proceeds to step S11 and the air conditioner 8 is air-conditioned. The set temperature is lowered by two stages and transmitted to the air conditioner outdoor unit 13 as data relating to the device operation change result. Thereby, air-conditioning load Qac increases further compared with one step. Here, when the outside air temperature tends to rise, it is considered that the air temperature in the store 3 does not drop too much even if the air conditioning set temperature is lowered. Therefore, when the air conditioning load ratio Rac is smaller than the optimum air conditioning load ratio Racb and the outside air temperature is increasing, the control of the air conditioner 8 is corrected in a direction to further increase the air conditioning load Qac of the air conditioner 8. And the air conditioning load ratio Rac is further increased so as to be closer to the optimum air conditioning load ratio Racb, so that the total operation efficiency of the air conditioner 8 and the refrigerated freezer showcase device 6 is further improved.

  On the other hand, if the average outside air temperature minus the current outside air temperature is positive and the positive value is equal to or higher than the specified value, that is, if the current outside air temperature is in a downward trend, the process proceeds to step S13 and the current state is maintained. That is, when the air conditioning load ratio Rac is smaller than the optimum air conditioning load ratio Racb and the outside air temperature tends to decrease, the operation change control of the air conditioner 8 is not performed.

  Next, in step S5, if the air conditioning load ratio Rac-optimum air conditioning load ratio Racb is positive, that is, if the air conditioning load ratio Rac is larger than the optimal air conditioning load ratio Racb, the process proceeds to "c". The flowchart of “c” is shown in FIG. In the case of “c”, the process proceeds from step S5 to step S14, and the difference between the average outside air temperature for 10 minutes and the current outside air temperature (average−current) is obtained. If the difference is within the upper and lower specified values and there is substantially no change in the outside air temperature (others), the process proceeds to step S16, where the air conditioning set temperature of the air conditioner 8 is increased by one step, It transmits to the air-conditioning outdoor unit 13. As a result, the air conditioning load Qac decreases. That is, when the air conditioning load ratio Rac is larger than the optimal air conditioning load ratio Racb and there is substantially no change in the outside air temperature, the control of the air conditioner 8 is performed in a direction to reduce the air conditioning load Qac of the air conditioner 8. The air conditioning load ratio Rac is made closer to the optimum air conditioning load ratio Racb while the air temperature in the store 3 is prevented from being excessively cooled.

  On the other hand, if the average outside air temperature minus the current outside air temperature is negative and the absolute value is equal to or higher than the specified value, that is, if the current outside air temperature is increasing, the process proceeds to step S15 and the current state is maintained. That is, when the air conditioning load ratio Rac is smaller than the optimum air conditioning load ratio Racb and the outside air temperature tends to decrease, the operation change control of the air conditioner 8 is not performed.

  On the other hand, if the average outside air temperature—the current outside air temperature is positive and the positive value is equal to or greater than the specified value, that is, if the current outside air temperature is in a downward trend, the process proceeds to step S17 to air-condition the air conditioner 8. The set temperature is increased by two stages and transmitted to the air conditioning outdoor unit 13 as data relating to the device operation change result. As a result, the air conditioning load Qac is further reduced as compared with the first stage. Here, when the outside air temperature tends to decrease, it is considered that the air temperature in the store 3 does not increase too much even if the air conditioning set temperature is increased. Therefore, when the air conditioning load ratio Rac is larger than the optimal air conditioning load ratio Racb and the outside air temperature is in a downward trend, the control of the air conditioner 8 is corrected so as to further reduce the air conditioning load Qac of the air conditioner 8. And the air conditioning load ratio Rac is further reduced to be closer to the optimum air conditioning load ratio Racb.

  In this embodiment, a method of changing the set temperature is adopted as a method of controlling the load of the air conditioner, but is not limited to this. For example, the effect of the present invention can be obtained even if the amount of air sucked into and blown out from the air conditioner or the amount of refrigerant flowing into the heat source side heat exchanger is controlled.

  In the above embodiment, the current air conditioning load ratio of the air conditioner is the calculated load ratio, and the optimal air conditioning load ratio is the optimal load ratio. However, in the inventions of claims 1 to 3, the current showcase load ratio is calculated. The load ratio and the optimum showcase load ratio, which is the regression equation of the broken line in FIG. 3, are determined as the optimum load ratio, and the present showcase load ratio and the optimum showcase load ratio are compared based on the load of the refrigerated showcase device. You may do it.

  However, if the air conditioning load ratio of the air conditioner is compared with the optimum air conditioning load ratio as in the embodiment, the operation change of the air conditioner can be executed more directly.

DESCRIPTION OF SYMBOLS 1 Refrigerated refrigeration air conditioner 2 Store 3 In-store 4 Showcase 6 Refrigerated refrigeration showcase apparatus 7 Air-conditioning indoor unit 8 Air conditioner 9 Controller (control apparatus)
11 Refrigerator 13 Air-conditioning outdoor unit 16 Data collection unit (data collection means)
17 Load ratio calculation / determination unit (load ratio calculation means, determination means)
18 Database (storage means)
19 Internal temperature / humidity sensor 21 Outside air temperature sensor

Claims (3)

A refrigerated freezer showcase device comprising a refrigerant circuit for cooling the interior of a showcase installed in the store, an air conditioner comprising a refrigerant circuit independent of the refrigerated freezer showcase device and air-conditioning the store; In the refrigerated refrigerating and air-conditioning apparatus provided with a control device that controls the operation of the refrigerated freezer showcase device and the air conditioner,
The control device includes storage means for storing data relating to an optimum load ratio that is an ideal ratio of the load of the refrigerated refrigeration showcase device and the load of the air conditioner, and the refrigerated refrigeration showcase device and the air conditioner. Data collection means for collecting data relating to the operating state, and calculates the load of the refrigerated showcase device and the load of the air conditioner from the data collected by the data collection means, and calculates the calculated load ratio that is the ratio of them to Yes a load ratio calculating means determines the difference between the optimum load ratio and the calculated load ratio, and determining means for the calculation load ratio to control the operation of the air conditioner in the direction in which the optimum load ratio And
The control device includes an outside air temperature detecting means for detecting an outside air temperature,
The storage means holds the optimum load ratio for each outside temperature, and the data collection means also collects the outside temperature detected by the outside temperature detection means,
The determination means adds correction to the control of the operation of the air conditioner based on the state of change in the outside air temperature detected by the outside air temperature detection means,
The determination means is configured such that when the load ratio of the air conditioner calculated by the calculated load ratio is smaller than the ideal load ratio of the air conditioner in the optimal load ratio and the outside air temperature does not change, the air When the load on the air conditioner is increased and the outside air temperature tends to increase, the operation of the air conditioner is controlled in a direction to further increase the load on the air conditioner, and the outside air temperature tends to decrease The refrigeration refrigerating air conditioner characterized by not performing control which changes the load of the air conditioner. The determination means, when the ratio of the load of the air conditioner by calculation in the calculated load ratio is the same as the ratio of the ideal air conditioner load in the optimal load ratio, and the outside air temperature tends to increase, When the load of the air conditioner is increased and there is no change in the outside air temperature, control for changing the load of the air conditioner is not performed, and when the outside air temperature tends to decrease, the load of the air conditioner is decreased. The refrigerating / refrigeration / air conditioning apparatus according to claim 1 , wherein the operation of the air conditioner is controlled in a decreasing direction . The determination means, when the load ratio of the air conditioner calculated by the calculation load ratio is larger than the ideal load ratio of the air conditioner in the optimal load ratio, and the outside air temperature tends to increase, No control is performed to change the load of the air conditioner, and when the outside air temperature does not change, the load of the air conditioner is decreased, and when the outside air temperature tends to decrease, the load of the air conditioner is further increased. The refrigerating / refrigeration / air-conditioning apparatus according to claim 1 or 2 , wherein the operation of the air conditioner is controlled in a decreasing direction .

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