JP2004278942A - Air conditioning system for shop - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system for a shop capable of improving the energy saving effect while improving the amenity in the shop. <P>SOLUTION: An amenity index value (PMV value) in a selling space 2 is detected on the basis of the environment of the selling space 2, and a set temperature Ts of an air conditioner 20 is operated to control the detected amenity index value within an amenity zone and to reduce the total consumed energy of the air conditioner 20 and a refrigerating machine unit 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a store air conditioning system that cools a store such as a convenience store.
[0002]
[Prior art]
2. Description of the Related Art As a control means of an air conditioner, PMV (Predicted Mean Vote) control that achieves both comfort and energy saving is known (for example, see Patent Document 1).
The PMV control calculates a comfort index value (referred to as a PMV value) from the indoor temperature and humidity, the indoor radiation temperature, the amount of clothing of the indoor person, the activity of the indoor person, and the like, and the PMV value is used as the target comfort index. This is control for operating the set temperature of the air conditioner so that the temperature becomes a value (referred to as a target PMV value).
[0003]
In air conditioning for homes and offices, PMV control according to only temperature and humidity is adopted from the viewpoint of cost and the like. For example, in a summer cooling season, the set temperature of the air conditioner is changed in a rising direction under a predetermined humidity condition. The energy saving operation of the air conditioner is realized by the rise in the set temperature.
[0004]
However, when air-conditioning a store where refrigeration equipment such as a refrigerated showcase is installed, for example, a convenience store, the control to raise the set temperature of the air conditioner alone as described above does not necessarily save energy when viewed from the entire store. Rather, there is a view that lowering the temperature inside the store by lowering the set temperature of the air conditioner leads to energy saving. The root of this idea is that the COP of the air conditioner is 2-3 times higher than the COP (annual energy consumption efficiency) of the refrigeration equipment, and that it is better to reduce the load on the refrigeration equipment.
[0005]
However, according to experiments, it was found that simply lowering the set temperature of the air conditioner does not lead to energy saving of store equipment including the refrigeration equipment and the air conditioner.
[0006]
Therefore, there is an air conditioning system that performs optimal control for energy saving by associating the temperature control of the refrigerator in the store with the temperature control of the air conditioner indoors (for example, see Patent Document 2).
[0007]
[Patent Document 1]
JP-A-9-14738
[0008]
[Patent Document 2]
JP-A-10-26389
[0009]
[Problems to be solved by the invention]
As described above, the example of executing the optimal control for energy saving by associating the in-store temperature control of the refrigeration equipment in the store with the indoor temperature control of the air conditioner is only for the purpose of energy saving. No consideration is given to the comfort of the car.
[0010]
Moreover, in the above example, there is no description about what kind of control is specifically executed, just because there is a control program for energy saving.
[0011]
The present invention has been made in consideration of the above circumstances, and has as its object to provide an air conditioning system for a store that can improve the energy saving effect while improving the comfort in the store.
[0012]
[Means for Solving the Problems]
The store air conditioning system according to the first aspect of the present invention detects the comfort index value in the store from the environment in the store, the detected comfort index value falls within the comfort zone, and the air conditioner and the refrigeration unit The set temperature of the air conditioner is controlled so that the total energy consumption of the equipment is reduced.
[0013]
The store air conditioning system according to the second aspect of the present invention detects the start / stop state of the refrigeration equipment and operates the set temperature of the air conditioner according to the detection result.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
[1] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[0015]
In FIG. 1, reference numeral 1 denotes a store, for example, a building of a convenience store, in which a sales space 2 and an office 3 are provided. The entrance and exit 4 and the transparent glass 5 are provided on the side wall of the counter space 2 on the side facing the road. In addition, the sales floor space 2 is apparently divided into a clerk zone where the clerk corresponds to the customer near the entrance 4 and a product zone where products are placed.
[0016]
In the merchandise zone, refrigeration equipment (also referred to as refrigeration equipment) such as a refrigerated reach-in showcase 6, a walk-in showcase 7, and open showcases 8, 9 is installed facing the wall and is not shown. However, a plurality of display shelves for displaying groceries and daily necessities are installed almost in the center. The frozen reach-in showcase 6 is used as a frozen showcase, an ice temperature chilled showcase, a refrigerated showcase, and the like. The walk-in showcase 7 is used as a refrigerated showcase. Cooling air is supplied to the open showcases 8 and 9 from below or above.
[0017]
A cashier counter (also referred to as a checkout counter) 10 is installed in the attendant zone. On this cashier counter 10, a register 11, an oden pan 12, a can warmer 13, a microwave oven 14, and the like are placed. The register 11 is connected to a POS terminal 16 in the office 3.
[0018]
In such a convenience store, the indoor unit 21 is attached to the ceiling surface of the sales space 2. The indoor unit 21 sucks the air in the sales space 2, cools or warms the sucked air, guides the cooled or heated air to the plurality of blowing units 22 by ducts, and blows out the air to the sales space 2 therefrom.
[0019]
An outdoor unit 23 is installed along the outer wall of the building 1, and the outdoor unit 23 and the indoor unit 21 constitute an air conditioner 20 described later. In the present embodiment, the air conditioner is provided with a heat pump refrigeration cycle capable of cooling and heating. However, since the present invention is intended for cooling operation, the following description is an operation in the cooling operation.
[0020]
An environment sensor 15 for detecting the temperature and humidity of the air in the sales space 2 is mounted on the inner wall surface of the sales space 2.
[0021]
The environment sensor 15 is connected to the controller 40 shown in FIG. The air conditioner 20 and the refrigerator unit 30 are further connected to the controller 40. The refrigerator unit 30 includes a refrigerator, a condenser, and a refrigeration cycle configured by connecting the respective coolers of the showcases 6, 7, 8, and 9 with piping.
[0022]
The controller 40 includes a PMV value detection unit 41, a stability determination unit 42, a refrigerator start / stop detection unit 43, a refrigerator stop time measurement unit 44, a stop time ratio calculation unit 45, and a set temperature operation unit 46. It is installed at any place inside.
[0023]
The PMV value detecting means 41 uses the temperature and humidity detected by the environment sensor 31 and performs a well-known calculation using information (amount of clothes and activities of persons in the room) defined as standard values for each season. The comfort index value (PMV value) of the space 2 is determined. As shown in FIG. 3, the comfort index value has a “+ value” and a “− value” with “0” interposed therebetween. The larger the value is on the + side, the greater the degree of feeling the heat, and the greater the value on the − side. The degree of feeling cold is large, and a range of ± 0.5 is a comfortable range.
[0024]
The stability determination unit 42 determines whether or not the environment of the sales space 2 is in a stable state. For example, when the temperature detected by the environment sensor 15 does not change for a certain period of time or more, or when a certain period of time has elapsed since the operation of the air conditioner 20 was interrupted by temperature control (attainment of the set temperature), or when the air conditioner When a certain time (20 minutes) has elapsed from the start of the operation of No. 20, it is determined that each is in a stable state.
[0025]
The refrigerator start / stop detection means 43 detects the start / stop state of the refrigerator unit 30 from ON / OFF of the compressor.
The refrigerator stop time measuring unit 44 determines the stop time T of the refrigerator unit 30 in each of the predetermined periods after the stability determination unit 42 determines the stable state and before and after the set temperature Ts of the air conditioner 20 is changed. Is measured based on the detection result of the refrigerator start / stop detection means 43. To is measured as the stop time before the change, and Tn is measured as the stop time after the change.
[0026]
The stop time ratio calculating means 45 calculates the ratio (Tn / To) of the stop times To and Tn measured by the refrigerator stop time measuring means 44. The set temperature operation means 46 is such that the comfort index value detected by the PMV value detection means 41 falls within the comfort zone, and the stop time ratio (Tn / To) calculated by the stop time ratio calculation means 45 is equal to or more than the set value S. The set temperature Ts of the air conditioner 20 is operated so that
[0027]
Next, the operation of the above configuration will be described with reference to the flowchart of FIG. The air conditioner 20 detects the temperature Ta of the air sucked into the indoor unit 21 by the suction air temperature sensor 24, and compares the detected temperature Ta with a set temperature Ts determined by an operation device (not shown). Controls the operation.
[0028]
After the operation of the air conditioner 20 is started (YES in step 101), when the temperature detected by the environment sensor 15 is in a stable state in which the temperature does not change for a certain period of time (YES in step 102), the refrigerator unit 30 is stopped for a predetermined period. The time To is measured (step 103). As shown in FIG. 5, the operation of the compressor of the refrigerator unit 30 is turned on and off in accordance with the temperature inside the showcases 6, 7, 8, and 9 in which the coolers are installed. The stop time To is the sum (= S1 + S2) of the operation off times S1 and S2 in a predetermined period (for example, a period in which the on / off operation of the refrigerator unit 30 is repeated twice).
[0029]
When the measurement of the stop time To is completed (step 104), the set temperature Ts of the air conditioner 20 is changed by 1 ° C. in the downward direction to confirm the room temperature response to the indoor air conditioning (step 105).
After the change, when the temperature detected by the environment sensor 15 becomes a stable state in which the temperature does not change for a predetermined time (YES in step 106), the refrigerator within a predetermined period (for example, a period in which the on / off of the refrigerator unit 30 is repeated twice) is performed. The stop time Tn of the unit 30 is measured, and the comfort index value (PMV value) of the counter space 2 is detected (step 107). The stop time Tn is the sum of the operation off times N1 and N2 (= N1 + N2) (see FIG. 5).
[0030]
If the detected comfort index value is larger than the upper limit of the comfort zone (YES in step 108), that is, if the comfort index value is outside the comfort zone on the hot side, the set temperature Ts of the air conditioner 20 is set to 1 A change operation is performed in the descending direction by ° C (step 111). If the comfort index value is smaller than the lower limit of the comfort zone (YES in step 109), that is, if the comfort index value is out of the comfort zone on the cold side, the set temperature Ts of the air conditioner 20 increases by 1 ° C. The direction is changed (step 112).
[0031]
If the comfort index value falls within the comfort zone (NO in step 108 and NO in step 109), the measured stop time ratio (Tn / To) of the stop times To and Tn is compared with the set value S. (Step 110). The stop time ratio (Tn / To) becomes larger as the stop time Tn after the set temperature Ts is changed is longer.
[0032]
If the stop time ratio (Tn / To) is greater than the set value S (YES in step 110), it is better to increase the operation time of the air conditioner 20 and extend the stop time T of the refrigerator unit 30 as much as possible. Based on the determination that the total power consumption of the refrigerator 20 and the refrigerator unit 30 is reduced, the set temperature Ts of the air conditioner 20 is changed by 1 ° C. in the downward direction (step 111).
[0033]
When the stop time ratio (Tn / To) is equal to or smaller than the set value S (NO in step 110), the set temperature of the air conditioner 20 is lowered to extend the stop time of the refrigerator unit 30, thereby saving the energy of the refrigerator unit 30. Changing the set temperature Ts of the air conditioner 20 by 1 ° C. in the upward direction based on the judgment that reducing the operation time (energy consumption) of the air conditioner 20 can reduce overall power consumption rather than trying to achieve it Is performed (step 112).
[0034]
After the set temperature Ts is decreased or increased, the value of the measured stop time Tn is set as a new stop time To (step 113). Then, when the temperature detected by the environment sensor 15 becomes a stable state in which the temperature does not change for a certain period of time (YES in step 106), the stop time Tn of the refrigerator unit 30 for a predetermined period is newly measured, and the comfort of the counter space 2 is measured. An index value is newly detected (step 107). Thereafter, the processing from step 108 to step 113 is repeated. When the operation of the air conditioner 20 is stopped due to closing of the store or the like (YES in step 114), a series of processing ends.
[0035]
As described above, the comfort time index value of the space of the sales floor space 2 is detected, and the stop time T of the refrigerator unit 30 is prolonged to the extent that the comfort index value can be maintained in the comfort zone, so that the refrigerator unit 30 By operating the set temperature Ts of the air conditioner 20 so that the energy consumption of the air conditioner 20 is reduced, the comfort in the store can be improved and the energy saving effect of the entire store can be improved.
[0036]
Note that the longer the stop time T of the refrigerator unit 30 is, the smaller the energy consumption of the refrigerator unit 30 is, but the longer the stop time T of the refrigerator unit 30 is, the lower the set temperature Ts of the air conditioner 20 is. This means that the operation time of the air conditioner 20 is prolonged, and the energy consumption of the air conditioner 20 increases. The balance between the operation time of the refrigerator unit 30 and the operation time of the air conditioner 20 is an important factor in reducing the total energy consumption of the refrigerator unit 30 and the air conditioner 20.
[0037]
Therefore, for example, “1.3” is selected as the optimum value of the set value S with respect to the stop time ratio (Tn / To) of the refrigerator unit 30. That is, when the set temperature Ts is decreased by 1 ° C., the stopping time T of the refrigerator unit 30 is extended and energy consumption is reduced, and the operating time of the air conditioner 20 is extended and energy consumption is increased. If the decrease in the energy consumption of the refrigerator unit 30 when the set temperature Ts drops by 1 ° C. is about 30%, the decrease in the energy consumption in the air conditioner 20 can sufficiently absorb the increase in the energy consumption. The set value S is selected so as to satisfy the condition.
[0038]
The set value S needs to be appropriately changed according to the number of showcases (the number of coolers) in the store, the capacity of the compressor in the refrigerator unit 30, the performance of the air conditioner 20, and the like. It has been confirmed by experiments that the range of “1.2” to “1.4” is appropriate for a typical convenience store.
[0039]
The set temperature Ts is operated using the stop times To and Tn of the refrigerator unit 30 as an index of the energy consumption. However, the set temperature Ts is operated using the operation times To ′ and Tn ′ of the refrigerator unit 30 as the index of the consumed energy. You may. In this case, “0.76 (= 1 / 1.3)” is selected as the set value S.
In FIG. 5, the operation time To 'is the sum of the operation-on times R1 and R2 (= R1 + R2), and the operation time Tn' is the sum of the operation-on times M1 and M2 (= M1 + M2). The operation time ratio is (Tn '/ To'), and is compared with the set value S (= "0, 76"). When the reciprocal (To ′ / Tn ′) is used as the operation time ratio, “1.3” is directly selected as the set value S.
[0040]
[2] A second embodiment will be described with reference to FIG.
Instead of one refrigerator unit 30, a number of refrigerator units 30a, 30b,... 30f corresponding to the showcases 6, 7, 8, 9 are provided. Each of the refrigerator units 30a, 30b,..., 30f has a refrigerating cycle configured by connecting the respective coolers of the showcases 6, 7, 8, 9 with piping.
[0041]
The controller 40 includes refrigerator start / stop detection means 43a, 43b,... 43f for detecting the start / stop states of the refrigerator units 30a, 30b,.
[0042]
The refrigeration unit stop time measurement unit 44 is provided with the refrigeration unit 30a, 30b,... In a predetermined period after the stability determination unit 42 determines the stable state and before and after the set temperature Ts of the air conditioner 20 is changed. 43f are measured based on the detection results of the refrigerator start / stop detection means 43a, 43b,... 43f, and the measured stop times T are determined by the selection coefficient and the selection coefficient set individually for each refrigerator unit. The correction stop time T 'is obtained by correcting the following equation using the rated power ratio of each refrigerator unit, and the total value of the correction stop times T' is obtained as the total stop time.
Correction stop time T '= Rated power ratio × Selection coefficient × Stop time T
Total stop time = total value of each correction stop time T '
The total stop time before the change is obtained as To, and the total stop time after the change is obtained as Tn.
[0043]
The selection coefficient is a ratio in which the stop time of each refrigerator unit is reflected in the total stop time, and is selected by weighting data set in consideration of the usage status of each showcase. For example, the selection coefficient “0.5” is selected for the frozen reach in showcase 6, the selection coefficient “0” is selected for the walk-in showcase 7, and the selection coefficient “1” is selected for the open showcases 8 and 9. Selected.
[0044]
The walk-in showcase 7 is often used for stocking commodities, and the work of loading commodities, so-called loading work, tends to occur frequently. During this loading operation, the refrigerator unit is often stopped in order for a person to enter the showcase. In addition, when a large amount of commodities are stocked, the temperature in the refrigerator does not decrease over a long period of time, and the stop time of the refrigerator unit increases regardless of the air conditioning load in the store. Under such circumstances, it is appropriate to exclude the stop time T from the beginning for the refrigerator unit of the walk-in showcase 7, and the selection coefficient “0” is selected for the exclusion.
[0045]
The stop time ratio calculating means 45 calculates a ratio (Tn / To) of the total stop times To and Tn measured by the refrigerator stop time measuring means 44. The set temperature operating means 46 determines that the comfort index value detected by the PMV value detecting means 41 falls within the comfortable range and that the total stop time ratio (Tn / To) calculated by the stop time ratio calculating means 45 is equal to the set value S. The set temperature Ts of the air conditioner 20 is operated as described above.
[0046]
Other configurations and operations are the same as those of the first embodiment.
[0047]
As described above, the use of the showcases 6, 7, 8, and 9 and the total stop time reflecting the rated power ratio of each refrigerator unit are used for control, so that the comfort in the store can be appropriately considered. Performance and energy saving effects.
[0048]
[3] A third embodiment will be described with reference to FIG.
As in the second embodiment, instead of one refrigerator unit 30, a number of refrigerator units 30a, 30b,... 30f corresponding to the showcases 6, 7, 8, 9 are provided. Each of the refrigerator units 30a, 30b,..., 30f has a refrigerating cycle configured by connecting the respective coolers of the showcases 6, 7, 8, 9 with piping.
[0049]
The controller 40 includes refrigerator start / stop detection means 43a, 43b,... 43f for detecting start / stop states of the refrigerator units 30a, 30b,. .
[0050]
The function of the refrigerator stop time measuring means 44 is the same as that described in the second embodiment, and a description thereof will be omitted.
[0051]
The air conditioner stop time measuring means 47 determines the stop time A of the air conditioner 20 for each predetermined period after the stability determination means 42 determines the stable state and before and after the set temperature Ts of the air conditioner 20 is changed. Is measured. Ao is measured as the stop time before the change, and An is measured as the stop time after the change.
[0052]
The stop time ratio calculating means 45 calculates the ratio (Tn / To) of the total stop times To and Tn measured by the refrigerator stop time measuring means 44 and the stop times Ao and An measured by the air conditioner 20. Is calculated (An / Ao).
[0053]
The set temperature operating means 46 determines that the comfort index value detected by the PMV value detecting means 41 falls within the comfortable range, and that the total stop time ratio (Tn / To) and the stop time Ao calculated by the stop time ratio calculating means 45. , An, and the set temperature Ts of the air conditioner 20 are operated such that the product X with the ratio (An / Ao) becomes equal to or more than the set value B.
X = (Tn / To) × (An / Ao)
Next, the operation of the above configuration will be described with reference to the flowchart of FIG.
The air conditioner 20 detects the temperature Ta of the air sucked into the indoor unit 21 by the suction air temperature sensor 24, and compares the detected temperature Ta with a set temperature Ts determined by an operation device (not shown). Controls the operation.
[0054]
After the operation of the air conditioner 20 is started (YES in step 201), when the temperature detected by the environment sensor 15 is in a stable state in which the temperature does not change for a certain period of time (YES in step 202), a predetermined period (for example, each refrigerator unit) The total stop time To of the refrigerator units 30a, 30b,... 30f and the stop time Ao of the air conditioner 20 during the period when the on / off operation is repeated twice are measured (step 203).
As shown in FIG. 9, the stop time Ao of the air conditioner 20 is the sum of the operation off times Q1 and Q2 (= Q1 + Q2).
[0055]
When the measurement of the total stop time To and the stop time Ao is completed (step 204), the set temperature Ts of the air conditioner 20 is changed by 1 ° C. in the downward direction (step 205).
After this change, when the temperature detected by the environment sensor 15 becomes a stable state in which the temperature does not change for a certain period of time (YES in step 206), the refrigerator unit in a predetermined period (for example, a period in which each refrigerator unit is repeatedly turned on and off twice) is set. The total stop time Tn of 30, 30b,... 30f is measured, the stop time An of the air conditioner 20 in the same predetermined period is measured, and the comfort index value (PMV value) of the sales space 2 is detected. (Step 207). The stop time An is the sum of the operation off times J1 and J2 (= J1 + J2) (see FIG. 9).
[0056]
If the detected comfort index value is larger than the upper limit of the comfort zone (YES in step 208), that is, if the comfort index value is outside the comfort zone on the hot side, the set temperature Ts of the air conditioner 20 is set to 1 A change operation is performed in the descending direction by the degree C. If the comfort index value is smaller than the lower limit of the comfort zone (YES in step 209), that is, if the comfort index value is out of the comfort zone on the cold side, the set temperature Ts of the air conditioner 20 increases by 1 ° C. The direction is changed (step 212).
[0057]
If the comfort index value falls within the comfort zone (NO in step 208, NO in step 209), the total stop time ratio (Tn / To) of the measured total stop times To and Tn and the measured stop time Ao. , An with the stop time ratio (An / Ao) is compared with a set value B (step 210).
[0058]
The product X is a determinant of the set temperature Ts, and takes into account not only the total stop time ratio (Tn / To) of each refrigerator unit but also the stop time ratio (An / Ao) of the air conditioner 20.
[0059]
If the product X is larger than the set value B (YES in step 210), it is better to increase the operation time of the air conditioner 20 and extend the stop time T of each refrigerator unit, so that the air conditioner 20 and each refrigerator unit are Based on the determination that the total power consumption of the air conditioner 20 is reduced, the set temperature Ts of the air conditioner 20 is changed by 1 ° C. in the downward direction (step 211).
[0060]
When the product X is equal to or less than the set value B (NO in step 210), the air conditioner is reduced by lowering the set temperature of the air conditioner 20 and extending the stop time of the refrigerator unit to save energy of each refrigerator unit. The setting temperature Ts of the air conditioner 20 is changed by 1 ° C. in the increasing direction based on the determination that reducing the operation time (energy consumption) of the air conditioner 20 can reduce the overall power consumption (step 212). .
[0061]
After the set temperature Ts is decreased or increased, the value of the measured total stop time Tn is set as a new total stop time To, and the value of the measured stop time An is set as a new stop time Ao. It is set (step 213). Then, when the temperature detected by the environment sensor 15 changes to a stable state in which the temperature does not change for a certain period of time (YES in step 206), the refrigerator units 30, The total stop time Tn of 30b,... 30f is measured, the stop time An of the air conditioner 20 during the same predetermined period is measured, and the comfort index value (PMV value) of the sales space 2 is detected (step). 207). Thereafter, the processing from step 208 to step 213 is repeated.
When the operation of the air conditioner 20 is stopped due to a store closing or the like (YES in step 214), a series of processing ends.
[0062]
As the optimal value of the set value B, a value smaller than the set value S (= 1.3) in the case of the second embodiment because the stop time ratio (An / Ao) of the air conditioner 20 is added. For example, “1.1” is selected.
[0063]
As described above, the comfort index value of the space in the sales space 2 is detected, and the total stop time T of each refrigerator unit and the stop time A of the air conditioner 20 are maintained while maintaining the comfort index value in the comfortable range. By operating the set temperature Ts of the air conditioner 20 in accordance with the condition, the comfort in the store and the energy saving effect can be improved.
[0064]
The total stop time To, Tn of each refrigerator unit and the stop time Ao, An of the air conditioner 20 were obtained as indices of energy saving, but the total operation time To ′, Tn ′ of each refrigerator unit and the air conditioner were determined. The operation times Ao ′ and An ′ of the machine 20 may be obtained as an index of energy saving. In FIG. 9, the operation time Ao ′ of the air conditioner 20 is the sum of the operation on times I1 and I2 (= I1 + I2), and the operation time An ′ is the sum of the sum of the operation on times K1 and K2 (= K1 + K2). The operation time ratio is (Kn '/ Ko').
[0065]
[4] A fourth embodiment will be described.
In each of the above embodiments, the start / stop state of the refrigerator unit is detected from the ON / OFF state of the compressor. However, the present system may have to be applied to an existing store. In such a case, the start / stop state of the compressor of the refrigerator unit cannot be detected because the refrigerator unit is already installed and in operation. In such a case, it is necessary to indirectly detect the start / stop state of the compressor of the refrigerator unit. Therefore, in the fourth embodiment, the start / stop state of the refrigerator unit is detected from a change in the physical state quantity of the refrigeration cycle.
[0066]
Physical states of the refrigeration cycle include the temperature of the refrigerant discharged from the compressor, the condensation temperature of the refrigerant, the temperature of the air blown from the outdoor unit (corresponding to the condenser temperature), and the like.
[0067]
As shown in the flowchart of FIG. 10, when the rate of decrease in the state quantity of the refrigeration cycle is detected (step 301), and when the rate of decrease is equal to or greater than the set value (YES in step 302), it is determined that the refrigerator unit has stopped. A determination is made (step 303), and the time t1 at that time is stored (step 304).
[0068]
After the refrigerator unit stops, the rate of increase of the state quantity of the refrigeration cycle is detected (step 305), and the detection result is compared with a predetermined set value (step 306). When the increasing speed of the state quantity becomes equal to or higher than the set value (YES in step 306), it is determined that the refrigerator unit has been started (step 307), and the time t2 at that time is stored (step 308). The stop time T of the refrigerator unit can be obtained by subtracting the time t1 from the time t2 (step 309).
The physical state quantity of the refrigeration cycle can be used not only for detecting the start / stop of the refrigerator unit but also for detecting an abnormality of the refrigerator unit.
Other configurations, operations, and effects are the same as those of any of the first, second, and third embodiments.
[0069]
[5] A fifth embodiment will be described.
In the fifth embodiment, the start / stop state of the refrigerator unit is detected from a change in the temperature inside the showcase to which the refrigerator unit is connected.
[0070]
As shown in the flowchart of FIG. 11, the internal temperature is detected (step 401), and when the detected temperature increases (YES in step 402), it is determined that the refrigerator unit has stopped (step 403), and The time t1 at that time is stored (step 404). When a refrigerator unit for which the start / stop state is to be detected is connected to a plurality of showcases, in step 401 described above, the inside temperatures of all the showcases to which the refrigerator unit is connected are stored. Has risen, and it is determined in step 403 that the refrigerator unit has stopped.
[0071]
After the refrigerator unit is stopped, the internal temperature is detected (step 405), and when the detected temperature falls (YES in step 406), it is determined that the refrigerator unit has been started (step 407), and Time t2 is stored (step 408). The stop time T of the refrigerator unit can be obtained by subtracting the time t1 from the time t2 (step 409).
Other configurations, operations, and effects are the same as those of any of the first, second, and third embodiments.
[0072]
[6] Modified example
In each of the above embodiments, the environmental sensor 15 is provided to detect the temperature and humidity of the sales space 2. However, when the air conditioner 20 has a suction air humidity sensor in addition to the suction air temperature sensor 24, Alternatively, the suction air temperature sensor 24 and the suction air humidity sensor of the air conditioner 20 may be used instead of the environment sensor 15.
In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.
[0073]
【The invention's effect】
As described above, according to the present invention, the comfort index value in the store is detected from the environment in the store, the detected comfort index value falls within the comfort zone, and the total energy consumption of the air conditioner and the refrigeration equipment is determined. Since the set temperature of the air conditioner is operated so as to reduce the size of the air conditioner, it is possible to provide a store air conditioning system capable of improving the comfort in the store and the energy saving effect.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a configuration of a store and an air conditioner in each embodiment of the present invention.
FIG. 2 is a block diagram of the first embodiment.
FIG. 3 is a diagram for explaining a comfort index value of each embodiment.
FIG. 4 is a flowchart for explaining the operation of the first embodiment.
FIG. 5 is a time chart showing an operation state of the refrigerator unit in the first embodiment.
FIG. 6 is a block diagram of a second embodiment.
FIG. 7 is a block diagram of a third embodiment.
FIG. 8 is a flowchart for explaining the operation of the third embodiment.
FIG. 9 is a time chart illustrating an operation state of the refrigerator unit and the air conditioner according to the third embodiment.
FIG. 10 is a flowchart for explaining the operation of the fourth embodiment;
FIG. 11 is a flowchart for explaining the operation of the fifth embodiment;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Convenience store building, 2 ... Sales space, 6 ... Frozen reach-in showcase, 7 ... Walk-in showcase, 8, 9 ... Open showcase, 10 ... Cash register counter, 11 ... Register, 15 ... Environmental sensor, 20 ... Air conditioner, 21 indoor unit, 22 blowout unit, 30 refrigerator unit, 40 controller, 41 PMV value calculation unit, 42 stability determination unit, 43 refrigerator start / stop detection unit, 44 refrigerator Stop time measuring means, 45: Stop time ratio calculating means, 46: Set temperature operating means

Claims (4)

An air conditioner that cools the interior of the store where the refrigeration equipment is installed with the target temperature set;
Detecting means for detecting a comfort index value in the store from the environment in the store,
Control means for operating the set temperature such that the comfort index value detected by the detection means falls within a comfort zone and the total energy consumption of the air conditioner and the refrigeration equipment is reduced;
An air conditioning system for a store, comprising: An air conditioner that cools the interior of the store where the refrigeration equipment is installed with the target temperature set;
Detection means for detecting a start / stop state of the refrigeration equipment;
Control means for operating the set temperature according to the detection result of the detection means,
An air conditioning system for a store, comprising: The air conditioning system for stores according to claim 2,
Further comprising a detecting means for detecting a comfort index value in the store from the environment in the store,
The control unit is a measurement unit that measures the stop time of the refrigeration equipment within a predetermined period based on the detection result of the detection unit, and when the set temperature is changed, is measured by the measurement unit before and after the change. Calculating means for calculating the ratio of the respective stop times, and the set temperature such that the comfort index value detected by the detecting means falls within a comfortable range and the ratio calculated by the calculating means is equal to or more than a set value. Operating means for operating,
An air conditioning system for stores characterized by the following. In the air conditioning system for stores according to claim 2 or claim 3,
The air conditioning system for a store, wherein the detecting means detects a start / stop state of the refrigeration equipment from a change in a physical state quantity of a refrigeration cycle in the refrigeration equipment or a change in temperature in the refrigerator in the refrigeration equipment.

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