JP6413761B2 - Snow and ice air conditioning system and its control device - Google Patents

Description

  The present invention relates to a snow-ice-use air conditioning system having a refrigeration cooler and a snow-ice cooler.

  Recently, as an air conditioning system mainly for data centers in cold districts, for the purpose of energy saving, a conventional type refrigeration cooling system (hereinafter referred to as a refrigeration cooling system) and an outside air type air conditioning system (hereinafter referred to as a refrigeration cooling system) An air-conditioning system has been proposed that is provided with an outside air-cooling device) and a snow and ice cooling facility (hereinafter referred to as a snow and ice cooling device). The snow and ice cooler creates a snowy mountain using snowfall in the winter, and cools the snowy mountain using the cold heat of the snowy mountain in other seasons (spring, summer, and autumn).

  In such an air conditioning system, for example, when the outside air temperature is lower than the temperature condition of the space to be cooled (server room, etc.), the outside air type cooling machine is operated, and when the outside air temperature exceeds the temperature condition of the server room, the refrigeration is performed. Control for operating the air conditioner or the snow and ice cooler is executed. Normally, the snowy mountain is stored until a period when the outdoor air-cooling unit cannot be used. For example, normally, in summer, the outdoor air-cooling system cannot be used because the outdoor air temperature is high (operation is counterproductive; that is, the indoor air is warmed by the outdoor air).

  In general, for the same cooling capacity, the power consumption increases in the order of an outdoor air-cooled type, a snow and ice cooler, and a refrigeration cooler. That is, since the refrigeration cooler has the largest power consumption, it is desirable from the viewpoint of energy saving to avoid operating the refrigeration cooler as much as possible.

  In addition, the refrigeration type air conditioner consumes a lot of electric power because the coefficient of performance is worse as the outside air temperature is higher. In other words, when operating in the summer, the refrigeration type air conditioner consumes a lot of electric power because of poor coefficient of performance. Therefore, from the viewpoint of energy saving, it is desirable to avoid operating the refrigeration cooler as much as possible in the summer.

For example, the prior art of Patent Document 1 is known.
The invention of Patent Document 1 can prevent insufficient humidification of the supply air while effectively performing outdoor air cooling using the outside air in the intermediate period and winter season, and can greatly reduce the operating energy when the cooling load in the intermediate period and summer season is large. It is what you want to do.

  In the technique of Patent Document 1, for example, in the machine room 2, the outside air passage 4 that communicates with the outside air inlet 3, the return air passage 7 that communicates with the air-conditioning target chamber 6 via the return air inlet 5, and the outside air passage 4. And a mixing section 9 that is partitioned into and communicated with the return air passage 7 and an air supply passage 11 that is partitioned into and communicated with the mixing section 9 and communicated with the air-conditioning target chamber 6 through the air supply air passage 10. In addition, a snow storage unit 30 in which snow is accumulated is provided outside the room, and a first-stage humidifier 12 for adiabatically humidifying the return air RA is installed in the return air passage 7. The air supply passage 11 is provided with a second-stage humidifier 14 and an air supply fan 19 for adiabatically humidifying the cooling coil 15 and the air-fuel mixture MA. Also, an outside air fan 23 is installed in the outside air passage 4, and an exhaust fan 27 is installed in the air conditioning target room 6. The outside air passage 4 is switched between the outside air OA and the snow-cooled outside air SOA, and the cooling heat of the snow-cold water 36 is led to the cooling coil 15. To guide.

JP 2012-145289 A

  If the snow mountain has sufficient capacity for the cooling load of the cooling target space (server room, etc.), it is not necessary to operate the refrigeration cooler, but there is not enough land to build the snow mountain. Or when there is a limit to the cost of constructing a snow and ice cooler, the amount of snowy mountains is reduced and a refrigeration cooler is added.

  In such a case, from the above description, it is more energy-saving operation to operate the refrigeration cooler except the peak time of the outside air temperature, and to stop the refrigeration cooler and operate the snow and ice cooler at the peak time of the outside temperature. Become. As described above, operating the refrigeration type air conditioner at the peak temperature of the outdoor temperature such as summer is the most inefficient operation method from the viewpoint of energy saving.

FIG. 11 shows an operation example.
In FIG. 11, the horizontal axis represents the month and day for one year, the vertical axis represents the outside air temperature (° C.), and the transition of the outside air temperature for one year is indicated by a solid line. This shows the average value of the outside air temperature for the past 10 years or 20 years.

As shown in the figure, the outdoor air-cooling device is operated during periods when the outside air temperature is low (winter and spring in January to May; autumn and winter in October and 12). In other words, in an environment where the outside air-use type air conditioner functions, the outside air-use type air conditioner, which is the air conditioner with the least power consumption, is operated. Then, when a situation which can not sufficiently cool the cooling target space (server room, etc.) at ambient-using air cooler outside air temperature is higher (in an environment of more than 18 ° C. in this case), snow and ice cooling machine or cold Koshiki Operate the air conditioner. From the above, it is desirable from the viewpoint of energy saving that the snow and ice cooler is operated during the peak time (summer season) of the outside air temperature. Than this, in the illustrated example, the outside temperature 18 ° C. or higher environment, when the outside air temperature is above 20 ° C. (in particular the peak period such as summer) driving a snow and ice cooling machine, refrigeration when less than 20 ° C. Operate air conditioner. In the example shown in the figure, the snow and ice cooler is operated for 2.5 months from the beginning of July to the middle of September. This is the amount of snow mountain constructed for 2.5 months, and the snow mountain has disappeared as of mid-September.

  If the outside air temperature of an arbitrary year is substantially the same as the average outside air temperature shown by a solid line in FIG. 11, the driving situation for that year should be almost as shown in FIG. 11 ( A threshold value (20 ° C.) for the operation switching determination is set in advance according to the amount of snowy mountains). That is, the snow and ice cooler can be operated at the peak time (summer season) of the outside air temperature, and the power consumption as a whole can be reduced.

  However, there is a problem when the outside air temperature of an arbitrary year is higher than the above average outside air temperature, for example, as indicated by a dotted line in FIG. In particular, as shown by the dotted line in FIG. 12, when the outside air temperature continues to be higher than normal before the summer season, as shown in FIG. 12, the operation of the snow and ice cooler is started earlier than the example shown in FIG. Will do. In the above control example, since the snow and ice cooler is operated when the temperature is 20 ° C. or higher, in the example indicated by the dotted line, the temperature becomes 20 ° C. or higher in May and the snow and ice cooler is operated.

  Here, as described above, in this example, since the snowy mountain has only 2.5 months, when the snow and ice cooler is operated from an earlier time than usual as described above, at an earlier time than usual (as illustrated). In the example, early August), the snowy mountain will be used up. That is, the snowy mountain disappears in the middle of the peak time of the outside air temperature, and after that, the refrigeration cooler must be operated in an environment of 18 ° C. or higher. For this reason, as shown in the drawing, the refrigeration cooler is operated even at the peak time of the outside air temperature (even in an environment of 20 ° C. or higher). As described above, the refrigeration type air conditioner has a poor coefficient of performance when the outside air temperature is high, so that power consumption increases.

  In this way, in years when the outside air temperature is higher than normal, the snow mountain is used up before or during the peak time (summer season), and a refrigeration air conditioner with high power consumption is used in summer. The problem of driving will arise.

On the other hand, if priority is given to a refrigeration air conditioner, it will leave a snowy mountain and cannot use a snow ice cooler effectively.
At least with respect to snow and ice cooling machine and cooling Koshiki air conditioning system cooling device is juxtaposed to solve the above problems, and is expected to be as high energy-saving effect is obtained.

  An object of the present invention is to provide an energy-saving operation in an air-conditioning system having a refrigeration cooler and a snow / ice cooler so that the snow mountain can be used effectively and effectively even in a year when the outside air temperature is higher or lower than normal. It is to provide an air conditioning system that can be controlled.

The snow-ice-use air conditioning system of the present invention includes a snow-ice air conditioner using a snowy mountain, a refrigeration-type air conditioner, and an outside-air-use type air conditioner, and has a control device that controls operation switching of each of the air-conditioners. And it has an outside air temperature measuring means for measuring the outside air temperature, and a snow and ice remaining amount measuring means for measuring the remaining amount of snow and ice in the snowy mountain.

And the said control apparatus has the following each function means.
- advance the snow and ice cooling machine, the refrigeration air-conditioner, a threshold storage means for storing a threshold value related to the ambient temperature to a threshold for the operation switching determination of the outdoor air-using air cooler;
-Design value storage means for storing in advance the design value of the remaining amount of snow and ice for each period;
Compare the ambient temperature measurement value is the measurement value of the outside air temperature and the threshold value, and, based on a comparison of the measured snow ice remaining amount and the previous SL design value, the snow and ice cooling machine, the refrigeration cooling machine, determining means for determining whether to operate the one of the outdoor air-using air cooler.
And even if the determination means tentatively determines that the snow and ice cooler is operated in the comparison between the measured value of the outside air temperature and the threshold value, the measured amount of remaining snow and ice uses the design value. When the predetermined condition is not satisfied, it is determined that the refrigeration cooler is operated.

  As described above, according to the present invention, in an air conditioning system including a refrigeration type cooling system, an outside air type cooling system, and a snow and ice cooling system, a snow mountain can be effectively used even in a year when the outside air temperature is higher or lower than normal. It can be used up effectively and can be controlled to save energy.

It is a block diagram of the snow-ice utilization air conditioning system of this example. It is a block diagram of the other example of the snow-ice utilization air conditioning system of this example. It is a process flowchart figure of operation control. It is a specific example of design snowy mountain residual amount ratio data. It is a figure which shows the rough driving | operation content by this method in the year when outside temperature is higher than a normal year. It is a figure which shows the rough driving | operation content by this method in the year when outside temperature is lower than a normal year. It is a figure which shows the specific example (the 1) of a snow-ice remaining amount detection process. It is a figure which shows the specific example (the 2) of a snow-ice remaining amount detection process. It is the other construction example of the snow-ice utilization air-conditioning system of this example. It is a functional block diagram of the snow-ice utilization air conditioning system of this example. This is a conventional operation example (No. 1). It is a conventional operation example (part 2).

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of the snow-ice-use air conditioning system of this example.
The snow / ice utilization air conditioning system of this example is an air conditioning system including a refrigeration type air conditioner, an outside air utilization type air conditioner, and a snow / ice air conditioner. The snow-ice-use air conditioning system of the present invention is an air-conditioning system including at least a refrigeration cooler and a snow-ice cooler.

  In the illustrated example, first, as the configuration of the refrigeration type air conditioner, an illustrated evaporator 11, a compressor 14, a condenser 13, and an expansion valve 12 are provided. The refrigerant circulates through these components 11 to 14 through the pipe 15. The refrigeration cooler is a cooling device using a general vapor compression refrigeration cycle using these general configurations, and therefore will not be described in detail.

  In addition, as the configuration of the above-described outside-air-use type air conditioner, an illustrated inside air heat exchanger 21, an outside air heat exchanger 22, and a pump 23 are provided. An arbitrary refrigerant circulates between the inside air heat exchanger 21 and the outside air heat exchanger 22 through the pipe 24 by pump power. Thus, the heat exchange between the outside air OA and the return air RA is performed indirectly through the refrigerant. Accordingly, the illustrated outside air utilization type air conditioner is referred to as an indirect outside air utilization type air conditioner. Since the indirect outside air-cooling system also has an existing configuration, it will not be described in further detail.

  Here, in the example shown in the figure, each of the above components is provided in either the indoor unit 2 provided on the indoor side or the outdoor unit 3 provided on the outdoor side. Here, with the wall 1 of any building as a boundary, the inside of the building is the indoor side and the outside of the building is the outdoor side. In addition, although the indoor unit 2 and the outdoor unit 3 have a housing | casing of a rectangular parallelepiped shape, for example, it is not restricted to this example.

  In the indoor unit 2, the evaporator 11, the indoor air heat exchanger 21, the illustrated indoor air fan 31, and the like are provided. In the illustrated example, the expansion valve 12 is also in the inside air unit 2, but the expansion valve 12 is not necessarily provided in the inside air unit 2.

  In the outdoor unit 3, the condenser 13, the outdoor air heat exchanger 22, and the illustrated outdoor air fan 32 are provided. In the illustrated example, the pump 23 and the compressor 14 are also provided in the outside air unit 3, but these configurations (23, 14) are not necessarily provided in the outside air unit 3.

  A cooling target space (not shown) (for example, a server room) is provided in the building which is a data center or the like. The indoor unit 2 receives return air RA, which is return air (warm air) from the cooling target space, and passes through the evaporator 11 and the internal air heat exchanger 21 to exchange heat with the refrigerant. Let it cool. Then, this cold air is supplied to the cooling target space as the supply air SA shown in the figure. Such an air flow is formed by the inside air fan 31.

  In addition, air outside the building (outside air OA) flows into the outdoor unit 3, exchanges heat with the condenser 13, the outside air heat exchanger 22, and the like, and discharges it as the illustrated exhaust EA. Such an air flow is formed by the outside air fan 32.

  Further, the configuration of the snow and ice cooler includes the illustrated heat exchanger 41, heat exchanger 42, secondary side chilled water pump 43, primary side chilled water pump 44, three-way valve 45, secondary side pipe 46, primary side pipe 47, and the like. There is. Cold water (for example, snow melting water) generated by snowy mountains flows in the primary side pipe 47, and this cold water is supplied to the heat exchanger 42 by the primary side cold water pump 44. Further, the amount of cold water supplied to the heat exchanger 42 is adjusted by valve opening control of the three-way valve 45.

  Further, water flows in the secondary side pipe 46, and this water is circulated through the heat exchanger 41 and the heat exchanger 42 by the secondary side cold water pump 43. During operation of the snow and ice cooler, this water is cooled by the primary side cold water in the heat exchanger 42 to become cold water, and this cold water is supplied to the heat exchanger 41. In the heat exchanger 41, the outside air OA is cooled by this cold water.

  Here, in the illustrated example, the heat exchanger 41 is provided on the upstream side of the flow of outside air (upstream side of the outside air heat exchanger 22), and the outside air OA first passes through the heat exchanger 41, It passes through the outside air heat exchanger 22 and the like. Therefore, during operation of the snow and ice cooler, the outside air OA is cooled by the heat exchanger 41 and the temperature is lowered, and is supplied to the outside air heat exchanger 22 and the like.

  In view of the above, the outside-air-use type air conditioner may be regarded as performing the heat exchange between the outside air OA and the return air RA indirectly simply. Therefore, when the temperature of the outside air OA supplied to the outside air heat exchanger 22 is equal to or higher than the temperature of the return air RA, the outside-air-use cooling device does not substantially function. However, even in such a state, if the temperature of the outside air OA is lowered below the temperature of the return air RA when the snow and ice cooler is in an operating state, the outside-air-use type cooler functions.

  Thus, in the case of the configuration example of FIG. 1, when the snow and ice cooler is put into an operating state, the outside-air-use type cooler is basically put into an operating state. However, this is the case of the configuration example of FIG. 1, and in the case of the other configuration example of FIG. 2, only the snow and ice cooler may be operated alone.

FIG. 2 shows another configuration example.
Only differences from FIG. 1 will be described with reference to FIG.
FIG. 2 differs from FIG. 1 in the location where the heat exchanger 41 is installed.

  That is, as shown in FIG. 2, the heat exchanger 41 is provided in the inside air unit 2. As a result, the heat exchanger 41 is configured to perform heat exchange between the cold water on the secondary side and the return air RA. Therefore, during operation of the snow and ice cooler, the return air RA is cooled by the heat exchanger 41 to become cool air, and this cool air is supplied to the cooling target space as the supply air SA.

  Although omitted in FIG. 2, the configuration of the refrigeration air conditioner, that is, the evaporator 11, the compressor 14, the condenser 13, and the expansion valve 12 are also provided in FIG. 2, as in FIG. 1. ing. Although not shown, the evaporator 11 is provided on the downstream side of the heat exchanger 41. That is, the return air RA that has flowed into the inside air unit 2 passes through the inside air heat exchanger 21 → the heat exchanger 41 → the evaporator 11 in this order, and is sent out as the supply air SA.

Thus, during operation of the refrigeration cooler, the return air RA is cooled by the evaporator 11 to become cool air, and this cool air is supplied as the supply air SA to the cooling target space.
Of course, during operation of the outside air-utilizing type air conditioner, the return air RA is cooled by the inside air heat exchanger 21 to become cool air, and this cool air is supplied to the cooling target space as the supply air SA. .

  Here, in the case of either configuration of FIG. 1 or FIG. 2, the illustrated snow ice air conditioning system is controlled by the illustrated control device 50. The control device 50 controls the start / stop of the compressor 14, the pump 23, the secondary chilled water pump 43, the primary chilled water pump 44, and the valve opening degree of the three-way valve 45 via a communication line (not shown). Perform adjustment control. Thereby, the control device 50 controls the start / stop of the operation of each of the refrigeration type air conditioner, the outside air utilization type air conditioner, and the snow and ice air conditioner. Alternatively, the control device 50 also controls the rotation speed of the inside air fan 31 and the outside air fan 32, and adjusts the temperature of the supply air SA to a predetermined set temperature.

  The control device 50 includes, for example, an arithmetic processor such as a CPU / MPU (not shown), a storage unit such as a memory, an input / output interface, and the like. A predetermined application program is stored in the storage unit in advance. When the arithmetic processor executes this application program, various control processes of the control device 50 in the present description are realized, and particularly, the process of FIG. 3 to be described later is realized.

  Here, in this method, the combined operation of the refrigeration type air conditioner, the outside air utilization type air conditioner, and the snow and ice air conditioner is basically not performed. For example, during operation of a snow and ice cooler, the refrigeration cooler and the outside air-utilizing cooler are in a stopped state. However, as an exception, in the case of the configuration as shown in FIG. 1, the outside-air type cooling unit is also in the operating state while the snow and ice cooling unit is in operation. However, since this is an exception, this point will not be particularly mentioned in the following description.

  However, when the temperature of the supply air SA is higher than a predetermined set value in a state where the outside air-use type cooling device is in operation, the refrigeration type air conditioner is used to reduce the temperature of the supply air SA to the predetermined set value. May be used in combination. In addition, when the temperature of the supply air SA is higher than a predetermined set value while the snow and ice cooler is operating, a refrigeration type air conditioner is also used in order to lower the temperature of the supply air SA to the predetermined set value. You may drive.

  Although not shown in FIGS. 1 and 2, various sensors are provided, and in particular, a temperature sensor (not shown) for measuring the temperature of the outside air OA is provided. The control device 50 inputs the outside air temperature measurement value as needed via a signal line (not shown). Of course, measurement values of other sensors (not shown) are also input, but this is not specifically described.

  And the control apparatus 50 performs the process of FIG. 3 based on "design snow mountain remaining amount ratio data" registered previously, the said outside temperature measured value, etc. FIG. The processing in FIG. 3 is executed periodically (in this example, every minute). The process in FIG. 3 is a process for determining which of the refrigeration type air conditioner, the outside air-use type air conditioner, and the snow / ice air conditioner is to be operated.

FIG. 4 shows a specific example of the “designed snow mountain remaining amount ratio data”.
Prior to the description of the processing in FIG. 3, first, a specific example of the “designed snow mountain remaining amount ratio data” will be described. For example, “design snow mountain remaining amount ratio data” as shown in FIG. 4 is arbitrarily created in advance by a snow and ice cooler designer or the like, and stored in, for example, the storage unit (not shown).

In the example shown in FIG. 4, “designed snow mountain remaining amount ratio data” shows the design value of the snow mountain remaining amount ratio (%) at the end of each month from January to December, and for June to August. Further, the design value of the snowy mountain remaining amount ratio (%) in the middle (15th) is also shown. In other words, for each period, the design value of the snowy mountain remaining amount ratio (%) corresponding to that period is shown in the “snow and ice remaining amount ratio” column shown in the figure. In the example shown in the figure, a snow mountain is constructed in March. The amount of snow at this time is defined as 100 (%), and the remaining amount of snow mountain at the end of each month or in the middle is indicated by a percentage (%). However, the present invention is not limited to this example, and the snowy mountain remaining amount (m ³ ) itself may be used. However, in this description, the explanation is basically made with an example using the snowy mountain remaining amount ratio (%).

  In the example shown in FIG. 4, each of the above periods is a half-month unit (the first half and the second half of each month) for June to August, and a monthly unit for other months. In the illustrated “snow and ice remaining amount ratio” column, the last day of each period is shown. That is, for example, July 15 in the figure means the first half of July, that is, the period from July 1 to July 15. In the example of FIG. 4, the design value of the remaining snowy mountain ratio (%) corresponding to the first half of July is 80%.

  The design value of the remaining percentage of snowy mountain (%) corresponding to each of the above periods is based on, for example, the past average outside air temperature indicated by a solid line in FIG. 11 and the like, and the amount of snowy mountains constructed in March, for example. The snow and ice cooler designers have decided arbitrarily. It should be noted that the design value of the snowy mountain remaining amount ratio (%) may be referred to as a designed snowy mountain remaining amount ratio.

  In this method, control is performed so that the actual snowy mountain remaining amount ratio does not become less than the designed snowy mountain remaining amount ratio (%) corresponding to the period in each period. Thus, in the example shown in FIG. 4, for example, for the first half of July, control is performed so that the actual snowy mountain remaining amount ratio does not become less than 80% within this period.

  In this method, basically, when the outside air temperature is less than 18 ° C., the outside-air-use type air conditioner is operated, and when the outside air temperature is 18 ° C. or more and less than 20 ° C., the refrigeration type air conditioner is operated. If the temperature is 20 ° C or higher, the snow and ice cooler is operated. Of course, the control device 50 also executes this control. However, when the temperature of the supply air SA is higher than a predetermined set value in a state where the outside air-use type cooling device is in operation, the refrigeration type air conditioner is used to reduce the temperature of the supply air SA to the predetermined set value. May be used in combination. In addition, when the temperature of the supply air SA is higher than a predetermined set value while the snow and ice cooler is operating, a refrigeration type air conditioner is also used in order to lower the temperature of the supply air SA to the predetermined set value. You may drive.

  If the outside air temperature is not low to some extent, the outside air use type cooling device will not function effectively and it will be difficult to maintain the cooling target space at the set temperature. Therefore, if the outside air temperature exceeds 18 ° C., at least the outside air use type cooling The machine will not be operated independently. In addition, as described above, mainly in the summer, that is, in a situation where the outside air temperature is very high, operating the refrigeration type air conditioner consumes a lot of electric power because the coefficient of performance is bad. In these cases, the snow and ice cooler is operated.

  However, for example, the snow and ice cooler was operated for an arbitrary period, but at a certain point in the period, the actual snowy mountain remaining amount ratio becomes the above-mentioned designed snowy mountain remaining amount ratio (%) corresponding to that period. After that, during that period, the operation of the snow and ice cooler is stopped and basically the refrigeration cooler is operated. Of course, even in this case, when the outside air temperature is less than 18 ° C., the outside-air-use type cooling device is operated.

  In the example of FIG. 4, for example, the design snow mountain remaining amount ratio (%) corresponding to July 15 shown in the figure is 80%. Therefore, during the period from July 1 to July 15, the operation of the snow and ice cooler is performed. When the actual percentage of remaining snowy mountain (%) decreases to 80% at a certain point because of the operation, the snow and ice cooling is maintained for the remainder of this period even if the outside air temperature is 20 ° C or higher. The machine does not drive. Instead, when the outside air temperature is 18 ° C. or higher, the refrigeration cooler is operated.

FIG. 3 is a process flowchart of the operation control.
This operation control is executed by the control device 50.
The control device 50 reads the outside air temperature regularly (every minute in the illustrated example) (step S11). The outside air temperature to be read is a moving average value in the illustrated example. That is, the control device 50 or another measurement device (not shown) or the like acquires a measured value of the temperature of the outside air OA by an outside temperature sensor (not shown) at a predetermined cycle (every minute in the example shown) (step S31). ). Then, on the basis of the measurement result for 10 minutes, a moving average of the outdoor air temperature measurement values for 10 minutes is calculated every minute (step S32). In this example, the calculation result (moving average of outside air temperature measurement values) is acquired in step S11.

Of course, this is only an example, and in the following description, it is assumed that the measured outside air temperature is simply acquired in step S11.
First, it is determined whether or not the outside air temperature measurement value acquired in step S11 exceeds 18 ° C. (step S12). When the outside air temperature is 18 ° C. or lower (step S12, NO), the outside air-use type cooling device is operated.

If the measured outside air temperature exceeds 18 ° C. (step S12, YES), it is further determined whether or not the outside air temperature measured value exceeds 20 ° C. (step S13).
When the outside air temperature measurement value exceeds 20 ° C. (step S13, YES), the snow and ice cooler is basically operated as described above, but by performing the processing of steps S14 and S15, In some cases, a refrigeration air conditioner may be operated.

  That is, if the determination in step S13 is YES, the current remaining amount of snow and ice is detected to obtain the above-mentioned ratio (%) (step S14), and the current actual snowy mountain remaining amount ratio is a period in which the present time is included. It is determined whether or not it is larger than the design snow mountain remaining amount ratio corresponding to (step S15). For example, when the current time is an arbitrary day in the first half of July (July 1 to July 15), 80% that is the design snow mountain remaining amount ratio corresponding to this period is used. .

In addition, you may make it perform determination of said step S15 etc. not using the said ratio but using the snowy mountain residual amount itself.
When the current actual snow mountain remaining amount ratio is larger than the designed snow mountain remaining amount ratio corresponding to the period including the current time (step S15, YES), the snow and ice cooler is operated (step S16). Then, the process returns to step S11.

  On the other hand, when the current actual snowy mountain remaining amount ratio is equal to or less than the designed snowy mountain remaining amount ratio corresponding to the period including the present time (step S15, NO), the refrigeration air conditioner is operated (step S19). In this case, a timer is started in order to secure a time until the refrigeration / cooling apparatus enters a stable operation and avoid frequent operation and stop (step S20), and an arbitrary time (5 in the illustrated example). (Min.) Wait until it elapses (step S21) and return to step S11.

  On the other hand, when the outside air temperature measurement value is 20 ° C. or less (and exceeds 18 ° C. from step S12) (step S13, NO), basically, as described above, the refrigeration type air conditioner is installed. Although it is operated, the snow and ice cooler may be exceptionally operated by performing the processes of steps S17 and S18.

  First, the process of step S17 is the same as the process of step S14. Then, it is determined whether or not the current actual snowy mountain remaining amount ratio obtained by this processing is smaller than the designed snowy mountain remaining amount ratio corresponding to the period including the current time point (step S18).

  When the actual snowy mountain remaining amount ratio is smaller than the designed snowy mountain remaining amount ratio (step S18, YES), the refrigeration air conditioner is operated (step S19). Also in this case, the timer is further started (step S20), and after waiting for an arbitrary time (5 minutes in the illustrated example) to elapse (step S21), the process returns to step S11.

  On the other hand, when the actual snowy mountain remaining amount ratio is larger than the designed snowy mountain remaining amount ratio (step S18, NO), the snow and ice cooler is operated (step S16). Then, the process returns to step S11.

  Note that the processing described above is an example, and the present invention is not limited to this example. For example, as another example, two types of design values used for the determinations in steps S15 and S18 may be prepared. For example, if the design value shown in the snow / ice remaining amount ratio column of FIG. 4 is described as the first design value, a second design value (not shown) is also created in advance, "". In the determination in steps S15 and S18, either one or both of the first design value and the second design value may be used. Thus, the threshold value (design value) used in the determinations in steps S15 and S18 is not limited to one type.

FIG. 5 is a diagram showing a schematic operation content according to the present method in a year when the outside air temperature is higher than normal.
In FIG. 5, the average value of the past outside air temperature is shown by a solid line, and the outside air temperature of a certain year is shown by a dotted line. In any case, it is shown for one year (January to December). As indicated by the solid line and the dotted line, the outside air temperature in a certain year is higher than the normal year (average value of the past outside air temperature).

  For this reason, as can be seen by comparing the dotted line and the solid line with the threshold values shown in the figure (18 ° C. and 20 ° C.), the period during which the outside air temperature exceeds 20 ° C. is much higher for the dotted line than for the solid line. long. Basically, when the outside air temperature exceeds 20 ° C, the snow and ice cooler is operated, so that the operation time of the snow and ice cooler becomes very long, and the snow mountain disappears on the way as shown in Fig. 12 above. Resulting in. For this reason, as shown in FIG. 12, the refrigeration cooler must be operated even in the summer when the outside air temperature is very high, and the total power consumption for one year of the entire snow-ice-use air conditioning system increases.

  However, in this method, by performing the control as shown in FIG. 3 and the like, the refrigeration cooler may be operated even when the temperature exceeds 20 ° C. as shown in FIG. As described above, this is the result of controlling the actual amount of remaining snow and ice (the ratio of remaining snowy mountains) to be almost as designed in each period. The amount of snow and ice remaining at the beginning of the project is enough for summer. Thus, as shown in the figure, the snow and ice cooler can be operated without the snow mountain disappearing on the way at the peak time of the outside air temperature (such as summer).

As a result, the operation time of the refrigeration type air conditioner at the peak time of the outside temperature (summer season, etc.) can be kept to a minimum, thereby obtaining a high energy saving effect.
Note that FIG. 5 and the like schematically show the operation status, but for example, during the operation period of the illustrated refrigeration cooler, only the refrigeration cooler is not operating. For example, if there is a day when the temperature has temporarily decreased, the outside air-based cooling may be operated on this day. Alternatively, the snow and ice cooler may be operated until the actual amount of remaining snow and ice reaches the design value. Alternatively, for example, since the air temperature changes during the day, when the outside air temperature is less than 18 ° C., for example, in the early morning, the outside air type cooling system may be operated.

FIG. 6 is a diagram showing a schematic operation content according to the present method in a year when the outside air temperature is lower than normal.
In FIG. 6, the average value of the past outside air temperature is shown by a solid line, and the outside air temperature of a certain year is shown by a dotted line. The solid line may be the same as in FIG.

  In the example of FIG. 6, the outside air temperature indicated by the dotted line is smaller than the normal outside air temperature indicated by the solid line, so that, for example, the remaining amount of snow and ice at the end of July is greater than the designed amount of remaining snow and ice assumed from the normal outside air temperature. Shall be. For this reason, as shown in the drawing, in the first half of July, the snow and ice cooler is operated even in a situation where the outside air temperature is in the range of 18 ° C. to 20 ° C. and the refrigeration cooler is normally operated. As a result, the remaining amount of snow and ice decreases, but the operation of the snow and ice cooler is continued as long as it does not fall below the above design value.

  In the example shown in the figure, in the second half of July, the outside air temperature dropped to less than 18 ° C., so the outside air type cooling system was operated. For this reason, since snow and ice were not digested as planned and the actual amount of remaining snow and ice was greater than planned (design value), even if the outside air temperature was within the range of 18 ° C to 20 ° C after that, the refrigeration type air conditioner Rather than running a snow and ice cooler. Of course, when the outside air temperature exceeds 20 ° C., the snow and ice cooler is operated. Of course, if the actual remaining amount of snow and ice falls below the design value during the period, the refrigerating type air conditioner is operated in the range of the outside air temperature of 18 ° C. to 20 ° C. for the rest of the period.

  After that, in the autumn, when the outside air temperature is less than 18 ° C., the outside air type cooling is operated as shown in the figure. It should be noted that, when the outside air-utilizing type air conditioner is in operation, when the temperature of the supply air SA is higher than a predetermined set value and the remaining amount of snow and ice is equal to or higher than the design value, the temperature of the supply air SA In order to reduce the temperature to a predetermined set value, the snow and ice cooler may be operated in combination. This is because the energy-saving effect is higher than when the refrigeration cooler is operated.

  As mentioned above, if the remaining amount of snow and ice is larger than planned, the total operation time of the refrigeration cooler can be reduced by operating the snow and ice cooler even in the situation of operating the refrigeration cooler. As a result, the total annual power consumption can be reduced. In other words, it is possible to obtain a high energy saving effect by making effective use of the snow and ice cooler as much as possible.

Hereinafter, a specific example of the snow and ice remaining amount detection process in steps S14 and S17 will be described with reference to FIGS.
FIG. 7 shows a specific example 1 and FIG. 8 shows a specific example 2.

First, specific example 1 will be described with reference to FIG.
Specific Example 1 and Specific Example 2 to be described later are for estimating the snowy mountain residual amount ratio based on the initial amount of cold heat in the snowy mountain and the integrated value of the amount of cold heat (acquired cold heat amount) taken out from the snowy mountain by an arbitrary time. is there.

Therefore, in the configuration of the specific example 1 shown in FIG. 7, for example, a calorific value calculation device 61, a flow meter 62, an outlet water temperature sensor 63, and an inlet water temperature sensor 64 are provided in the configuration shown in FIG. 2.
The flow meter 62 is a flow meter that measures the flow rate of cold water (such as snowmelt water) flowing through the primary side pipe 47. This flow rate measurement value is used as L (snow mountain circulating water amount) in the equation (1) described later.

  The outlet water temperature sensor 63 is a temperature sensor that measures the temperature at the outlet side of the cold water from the snowy mountain. The inlet water temperature sensor 64 is a temperature sensor that measures the temperature of the cold water at the entrance to the snowy mountain. The difference between the temperature measured by these two water temperature sensors is ΔT in the equation (1) described later.

  The calorific value calculation device 61 acquires the measurement results by the sensors 62, 63, 64 as needed, and uses the measurement data to obtain the cold heat amount (acquired cold heat amount) extracted from the snowy mountain by, for example, the following equation (1). Qw is calculated.

Qw = L * [Delta] T * c * [rho] w (1)
Qw: Acquired cold energy (MJ / h)
L: Circulation volume of snow mountain (L / h)
ΔT: Temperature difference between snow mountain inlet water temperature and outlet water temperature (℃)
c: Specific heat of water (4.186MJ / kg ℃)
ρw: Water density (kg / L)
As described above, L and ΔT are obtained by using the measured values of the sensors 62, 63, and 64 or calculated from the measured values. The values of c and ρw are set in advance. Using these measured values and set values, the obtained cold energy amount Qw per hour is calculated by the above equation (1). In addition, although Formula (1) has shown the calculation formula of the amount of acquired cold heat for 1 hour, the accuracy of Qw will become higher when the measurement period by the said sensors 62, 63, 64 is shortened and added. By adding this Qw to the operation time of the snow and ice cooler so far (total operation time after the construction of the snow mountain), this integrated value itself is used as the snow and ice utilization cold heat amount Qc so far. The integrated value is an initial value “0”. On the other hand, the amount of cold heat Qm of the snowy mountain at the time of construction can be calculated by the following equation (2).

Qm = V x ρs x q (2)
Qm: Snow mountain cold heat (MJ) at the time of construction
V: Snow mountain volume (m ³ )
ρs: Snow density (0.6t / m ³ )
q: Snow melting heat (335MJ / t)
However, not all of the cold heat in the snowy mountains is transferred to snow-ice-based cold heat. It is known that the proportion that can be effectively used in general, such as natural melting and heat loss from piping, is 30 to 50%. Here, this ratio is called an effective utilization rate. The effective utilization rate is a characteristic value unique to the snow and ice facility, but after one season, the effective utilization rate of the facility can be calculated. In other words, it can be said that the true effective utilization rate is obtained by dividing the amount of snow and ice utilization cold heat (the amount of cold heat available to the snow mountain at the time of construction) Qmc when the snow mountain disappears by the amount of snow mountain cold heat Qm at the time of construction. From this, if this effective utilization rate is η, the amount of cold heat Qmc that can be used by the snow mountain at the time of construction can be calculated from the following equation (3).

Qmc = Qm x η (3)
Qmc: The amount of available cold heat (MJ) in the snowy mountain at the time of construction
Qm: Snow mountain cold heat (MJ) at the time of construction
η: Effective utilization rate The amount of remaining cold heat (snow and ice remaining amount) can be calculated by subtracting the amount of snow and ice-use cold heat Qc that has been used so far from the amount of cold heat Qmc that can be used in the snowy mountain at the time of construction determined by equation (3). it can. Furthermore, the value obtained by dividing the remaining amount of cold heat by the amount of cold heat Qmc that can be used in the snowy mountain at the time of construction is the remaining amount of snow and ice (%).

  The temperature difference ΔT between the snow mountain inlet water temperature and the outlet water temperature and the snow mountain circulation water amount are determined by the snow mountain construction method. As the snow mountain construction method, there is a method of cooling the circulating water by sprinkling circulating water inside the snow mountain as shown in FIG. 7, but is not limited to this example. For example, although not particularly illustrated, there is a method of embedding a heat exchanging pipe in the ground below the snowy mountain and cooling the water circulating in the pipe with snow melting water.

As a method of knowing the snow-ice-use cold heat quantity Qc, an existing integrated calorimeter that can be directly measured may be used.
FIG. 8 shows a configuration of the second specific example in which an integrated calorimeter is used.

  The configuration of FIG. 8 is provided with an integrated calorimeter 71, an outlet water temperature sensor 72, and an inlet water temperature sensor 73, for example, compared to the configuration shown in FIG. The outlet water temperature sensor 72 and the inlet water temperature sensor 73 are the same as the outlet water temperature sensor 63 and the inlet water temperature sensor 64 in FIG. 7, and are not particularly described here.

  The integrated calorimeter 71 inputs the measured values of the outlet water temperature sensor 72 and the inlet water temperature sensor 73 and measures the amount of cold energy used. The integrated calorimeter 71 itself is a measuring device in which an existing product exists, and its measurement operation and processing will not be particularly described.

  As described above, according to this method, snow and ice can be effectively used even in a year when the outside air temperature is higher or lower than normal in a snow and ice-based air conditioning system that includes a refrigeration cooling system, an outdoor air-based cooling system, and a snow and ice cooling system. It is possible to provide an air conditioning system or the like that can be used and effectively used and can be controlled to achieve the most energy-saving operation.

Note that the outside air-based cooling may be a method of directly introducing outside air into the server room or a method of indirectly utilizing the cold air of the outside air.
FIG. 9 is another example of construction of the snow and ice-use air conditioning system of this example.

As shown in the figure, the snowy mountain may be used in common for a plurality of air conditioners (for example, an air conditioner having a refrigeration cooler and an outdoor air cooler).
In FIG. 10, the functional block diagram of the snow-ice utilization air-conditioning system of this example is shown.

  The snow-ice-use air conditioning system of this example is an air-conditioning system that includes a snow-ice air conditioner that uses snowy mountains, a refrigeration-type air conditioner, and an outside-air-use type air conditioner, and a control device that controls operation switching of each air conditioner. An example of this control device is the control device 50.

  In the example shown in FIG. 10, the snow-ice-use air conditioning system of this example includes an outside air temperature measuring unit 81 that measures the outside air temperature, a remaining snow ice amount measuring unit 82 that measures the remaining amount of snow and ice in the snowy mountain, the control device 50 and the like. Have.

The outside air temperature measurement unit 81 is, for example, a temperature sensor (not shown in FIG. 1) that measures the temperature of the outside air OA shown in FIG. The snow and ice remaining amount measuring unit 82 is, for example, a calorific value calculating device 61, a flow meter 62, an inlet water temperature sensor 64, an outlet water temperature sensor 63, and the like shown in FIG. Alternatively, the snow and ice remaining amount measuring unit 82 is, for example, an integrated calorimeter 71, an inlet water temperature sensor 73, an outlet water temperature sensor 72, and the like shown in FIG.

The control device 50 includes various processing function units such as a threshold value storage unit 51, a design value storage unit 52, and a determination unit 53.
The threshold value storage unit 51 stores a threshold value related to the outside air temperature, which is a threshold value for determining the operation switching of the snow and ice cooler, the refrigeration type cooler, and the outside air type cooler in advance. Specific examples of this threshold are 18 ° C., 20 ° C., and the like.

The design value storage unit 52 stores a design value of the remaining amount of snow and ice for each period in advance. A specific example of this design value is the “design snow mountain remaining amount ratio data” shown in FIG.
In addition, the determination unit 53 operates any one of the snow / ice air conditioner, the refrigerating type air conditioner, and the outside air-use type air conditioner based on the outside air temperature measurement value, the measured remaining amount of snow and ice, the threshold value, and the design value. It is determined whether.

Even if the determination unit 53 temporarily determines that the snow and ice cooler is operated based on the outside air temperature and the threshold value, if the measured remaining amount of snow and ice does not satisfy the predetermined condition using the design value, the refrigeration type It is determined that the air conditioner is operated. For example, the threshold value includes a first threshold value and a second threshold value greater than the first threshold value, and the determination unit 53 operates the snow and ice cooler when the outside air temperature measurement value is greater than the second threshold value. Then, the provisional determination is made, but when the measured amount of remaining snow and ice is smaller than the design value corresponding to the period including the present time, it is determined that the refrigeration type air conditioner is operated. In this specific example, this determination is the refrigeration type air conditioner operation of step S19 if step S12 is YES and step S13 is YES, but if step S15 is NO. In the specific example, 18 ° C. corresponds to the first threshold value, and 20 ° C. corresponds to the second threshold value.

  Note that the “smaller than the design value” includes the case of “below the design value”. The reverse is also true. In other words, whether it is “greater than” or “greater than”, “less than”, “less than”, or the like may be any, and is not an essential story.

Further, even when the determination unit 53 tentatively determines that the refrigeration air conditioner is operated based on the outside air temperature and the threshold, if the measured amount of remaining snow and ice does not satisfy a predetermined condition using the design value, It is determined that the snow and ice cooler is operated. For example, when the outside air temperature measurement value is equal to or more than the first threshold value and less than the second threshold value, it is temporarily determined that the refrigeration type air conditioner is operated. If it is larger than the design value corresponding to the period, the snow / ice cooler is determined to be operated. This determination is, in the above embodiment, in which the step S12 is even and the step S13 is NO YES, a step S18 is if NO, it is determined that driving the snow and ice cooling machine.

For example, when the outside air temperature measurement value is smaller than the first threshold value, the determination unit 53 determines that the outside air utilization type air conditioner is operated.
The snow and ice remaining amount measuring unit 82 is not limited to the example in FIG. 7, and the example described in FIG. 8 may be used.

  As described above, according to the snow / ice-use air conditioning system of the present example, the snow mountain is effective even in a year when the outside air temperature is higher or lower than normal in an air-conditioning system including a refrigeration cooling system, an outdoor air-based cooling system, and a snow / ice cooling system. Can be used efficiently and used up effectively, and can be controlled to achieve energy-saving operation. Effective use of snowy mountains over a long period of time can be realized, so that an excellent energy saving effect over a long period of time can be obtained.

  Note that the first design value shown in FIG. 4 is a specific example of the basic control (that is, if the step S13 is YES, for example, the snow and ice cooler operation is always performed when the outside air temperature is normal. The remaining amount of snow and ice at the end of each period when control is performed is estimated or actually measured.

2 Indoor unit 3 Outdoor unit 11 Evaporator 12 Expansion valve 13 Condenser 14 Compressor 15 Pipe 21 Inside air heat exchanger 22 Outside air heat exchanger 23 Pump 24 Pipe 31 Inside air fan 32 Outside air fan 41 Heat exchanger 42 Heat exchanger 43 Two Secondary side cold water pump 44 Primary side cold water pump 45 Three-way valve 46 Secondary side piping 47 Primary side piping 50 Control device 51 Threshold storage unit 52 Design value storage unit 53 Judgment unit 61 Calorific value calculation unit 62 Flow meter 63 Outlet water temperature sensor 64 Inlet water temperature Sensor 71 Integrating calorimeter 72 Outlet water temperature sensor 73 Inlet water temperature sensor 81 Outside air temperature measurement unit 82 Snow and ice remaining amount measurement unit

Claims (10)

A snow and ice air conditioning system comprising a snow and ice cooling device using a snowy mountain, a refrigeration type cooling device, and an outside air using type cooling device, and having a control device that performs operation switching control of each of the cooling devices,
An outside air temperature measuring means for measuring the outside air temperature;
Snow ice remaining amount measuring means for measuring the amount of snow and ice remaining in the snowy mountain,
The control device includes:
Advance the snow and ice cooling machine, the refrigeration air-conditioner, a threshold storage means for storing a threshold value related to the ambient temperature to a threshold for the operation switching determination of the outdoor air-using air cooler,
Design value storage means for storing the design value of the remaining amount of snow and ice in each period in advance;
Comparison with the outside air temperature measurement value is the measurement value of the outside air temperature and the threshold value, and, based on a comparison of the measured snow ice remaining amount and the previous SL design value, the snow and ice cooling machine, the refrigerating type cooling machine and determining means for determining whether to operate the one of the outdoor air-using air cooler,
I have a,
Even if the determination means tentatively determines that the snow and ice cooler is to be operated by comparing the measured value of the outside air temperature and the threshold value, the measured remaining amount of snow and ice is a predetermined value using the design value. When the condition is not satisfied, it is determined that the refrigeration type air conditioner is operated . Said determining means, snow and ice remaining amount which is the measured, is smaller than the design value corresponding to a predetermined period including the current time, the claim 1, wherein the determining that the operation of the refrigeration air-conditioner Snow and ice air conditioning system. A snow and ice air conditioning system comprising a snow and ice cooling device using a snowy mountain, a refrigeration type cooling device, and an outside air using type cooling device, and having a control device that performs operation switching control of each of the cooling devices,
An outside air temperature measuring means for measuring the outside air temperature;
Snow ice remaining amount measuring means for measuring the amount of snow and ice remaining in the snowy mountain,
The control device includes:
Threshold storage means for storing a threshold related to the outside air temperature, which is a threshold for operation switching determination of the snow and ice cooler, the refrigeration cooler, and the outside air use type cooler in advance.
Design value storage means for storing the design value of the remaining amount of snow and ice in each period in advance;
Based on the comparison between the measured value of the outdoor temperature, which is a measured value of the outdoor temperature, and the threshold value, and the comparison between the measured amount of remaining snow and ice and the design value, the snow and ice cooler, the refrigeration cooler, A determination means for determining which of the outside air-utilizing type air conditioners is operated;
Have
The threshold includes a first threshold and a second threshold that is greater than the first threshold,
The determination means tentatively determines that the snow and ice cooler is operated when the measured value of the outside air temperature is larger than the second threshold value, but the measured amount of remaining snow and ice is a predetermined condition using the design value. the if not satisfied, snow ice utilize air conditioning systems that determining means determines that the operated the refrigeration air-conditioner. 4. The snow-ice-use air conditioning system according to claim 3 , wherein when the outside air temperature measurement value is smaller than the first threshold, the determination unit determines that the outside-air-use type cooling device is operated. The said determination means determines that the said refrigerating type air conditioner is operated when the measured amount of remaining snow and ice is smaller than the design value corresponding to a predetermined period including the present time. Snow and ice air conditioning system. A snow and ice air conditioning system comprising a snow and ice cooling device using a snowy mountain, a refrigeration type cooling device, and an outside air using type cooling device, and having a control device that performs operation switching control of each of the cooling devices,
An outside air temperature measuring means for measuring the outside air temperature;
Snow ice remaining amount measuring means for measuring the amount of snow and ice remaining in the snowy mountain,
The control device includes:
Threshold storage means for storing a threshold related to the outside air temperature, which is a threshold for operation switching determination of the snow and ice cooler, the refrigeration cooler, and the outside air use type cooler in advance.
Design value storage means for storing the design value of the remaining amount of snow and ice in each period in advance;
Based on the comparison between the measured value of the outdoor temperature, which is a measured value of the outdoor temperature, and the threshold value, and the comparison between the measured amount of remaining snow and ice and the design value, the snow and ice cooler, the refrigeration cooler, A determination means for determining which of the outside air-utilizing type air conditioners is operated;
Have
Given the determination unit, when operating the refrigeration air cooler in comparison with the outside air temperature measured value and the threshold value even when the temporary decision, snow and ice remaining amount which is the measured, using the design values snow ice available air conditioning system if not satisfied condition, determines to operate the snow and ice cooling machine, characterized in that. The said determination means determines that the said snow and ice cooler is operated when the measured amount of remaining snow and ice is larger than the design value corresponding to a predetermined period including the present time. Snow and ice air conditioning system. A snow and ice air conditioning system comprising a snow and ice cooling device using a snowy mountain, a refrigeration type cooling device, and an outside air using type cooling device, and having a control device that performs operation switching control of each of the cooling devices,
An outside air temperature measuring means for measuring the outside air temperature;
Snow ice remaining amount measuring means for measuring the amount of snow and ice remaining in the snowy mountain,
The control device includes:
Threshold storage means for storing a threshold related to the outside air temperature, which is a threshold for operation switching determination of the snow and ice cooler, the refrigeration cooler, and the outside air use type cooler in advance.
Design value storage means for storing the design value of the remaining amount of snow and ice in each period in advance;
Based on the comparison between the measured value of the outdoor temperature, which is a measured value of the outdoor temperature, and the threshold value, and the comparison between the measured amount of remaining snow and ice and the design value, the snow and ice cooler, the refrigeration cooler, A determination means for determining which of the outside air-utilizing type air conditioners is operated;
Have
The threshold includes a first threshold and a second threshold that is greater than the first threshold,
The determination means, the outside air temperature measured value is provisionally determined when operating the refrigeration cooling machine if and more the first threshold value is less than the second threshold value, snow and ice remaining amount which is the measured, the If not satisfy the predetermined condition, the snow ice utilize air conditioning systems that determining means determines that the operated the snow and ice cooling machine using design values.   The snow / ice-use air conditioning system according to claim 8, wherein the determination unit determines that the outside-air-use type cooling unit is operated when the outside-air temperature measurement value is smaller than the first threshold value. 9. The determination unit according to claim 8, wherein when the measured amount of remaining snow and ice is larger than the design value corresponding to a predetermined period including a current time, it is determined that the snow and ice cooler is operated. Snow and ice air conditioning system.