JP2012068008A - Air conditioning system of facilities having plural stories and method of operating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationally ensure redundancy of N+1 or N+2 in an air conditioning system constructed to have multiple stories.SOLUTION: In a building 1 having rooms R1-RF with high heat generating devices installed therein, in first to F stories, each of the rooms R1-RF is divided into a plurality of unit air-conditioning regions in which the high heat generating devices are collected, and the maximum amounts of heat generation are approximately equal to each other. In the indoor air conditioners AC1-AC6 each having a capacity for processing the maximum amount of heat generation of the unit air-conditioning region, and supplying the conditioned air indoors, first to sixth groups G1-G6 are constituted by the indoor air conditioners of each story installed on the vertically-same positions of the multiple stories. The building 1 includes one or two auxiliary air conditioning system modules for supplying a heat medium from an auxiliary heat source device ER to auxiliary indoor air conditioners 1RC-RC respectively installed on each of the stories approximately at the same positions in the vertical direction, of the multiple stories.

Description

  The present invention relates to an air conditioning system that rationally realizes system redundancy and an operation method thereof.

  The redundancy of the system in the air conditioning system gives almost equal redundancy to components such as the heat source equipment, the piping system, and the secondary side air conditioner so that the entire system has a balanced redundancy, and the availability (availability: For example, it is the capacity that the system can continue to operate, such as how long it can be driven out of 8760 hours per year, and what is generally expressed as a numerical value is called the operating rate). It is important to secure in.

  For example, generally in a package type air conditioning system, an indoor unit and an outdoor unit are connected by a single refrigerant pipe to form an independent air conditioning system (Patent Document 1), and a single package system is installed as a spare, so-called N + 1 redundancy is realized. Note that N + 1 redundancy means that, for example, when the server room is air-conditioned by a plurality of air conditioners and the server operating environment is maintained, one more air conditioner is prepared than the number required for the maintenance. This is a mechanism that prevents the server system from being stopped due to a failure or the like and improves reliability.

  However, in such a system, when the multi-layer floor is used as an IT equipment room such as a computer room or a server room, it is necessary to prepare each outdoor unit corresponding to the indoor unit on each floor, and the arrangement of the outdoor units. The space is limited, and there are many refrigerant pipes and multiple pipes, resulting in pipe construction and management difficulties. In such a case, the central heat source method of the water circulation method is often adopted (Patent Document 2). However, in the water circulation method, redundancy is generally ensured by doubling the piping. I have to. Correspondingly, the air conditioner itself is equipped with a spare set (for example, a spare coil).

  However, in this case, the redundancy is at least 2N for the piping and N + 1 or N + 2 for the air conditioner, and the redundancy is inconsistent, resulting in an increase in equipment cost and space.

Japanese Patent Laid-Open No. 2005-9787 Japanese Patent No. 3439004

  As described above, it has not been satisfactory to secure reasonable redundancy in the conventional multi-story air conditioning system. This invention is made | formed in view of this point, and it aims at ensuring the redundancy of N + 1 or N + 2 rationally in the air-conditioning system constructed in a multi-story floor.

  In order to achieve the above object, the present invention is a system for air-conditioning a facility having a room in which a plurality of high heat-generating devices are installed on two or more multi-layer floors, and each room on each floor has 1 each. An indoor air conditioner that is divided into a plurality of unit air-conditioning areas where the maximum heat generation amount is disposed, and that has the ability to process the maximum heat generation amount of the unit air-conditioning area, and blows conditioned air into the room. Each unit air conditioning area has a group of indoor air conditioners on each floor that are located at approximately the same position in the vertical direction of the multi-story floor, and each group heats the indoor air conditioners in the group through a common pipe. A heat source device for supplying a medium, and the heat source device for each group, the common piping, and the indoor air conditioner on each floor constitute one air conditioning system module, and further, at the same position in the vertical direction of the multilayer floor. Each located 1 or 2 spare air-conditioning system modules comprising a spare indoor air-conditioner provided in the vehicle and a spare heat source device that supplies a heat medium to the spare indoor air-conditioners through a common pipe It is characterized by that.

  According to the present invention, even if an indoor air conditioner on each floor breaks down, it is possible to respond immediately by operating a spare air conditioner, and it is possible to ensure N + 1 or N + 2 redundancy. Moreover, since the pipes for realizing this are common pipes straddling the multi-story floor in the vertical direction, it is not necessary to install a large number of heat medium pipes in the conventional manner, and management is easy. The redundancy of N + 2 can be dealt with, for example, when one unit is engaged in maintenance and the other unit fails.

  In the present invention, a high heat generating device refers to a so-called IT device such as a computer or a server. The processing of the maximum heat generation means that low-temperature air is supplied to the maximum heat generation of the high heat generating devices so that the temperature environment of these high heat generating devices does not exceed the guaranteed operating temperature. Furthermore, in the present invention, the maximum calorific value is substantially equal includes the ratio of the unit air-conditioning area with the smallest calorific value and the unit air-conditioning area with the largest calorific value up to a range of 1: 1.2. Meaning. And that an indoor air conditioner is located at substantially the same position in the vertical direction of a multi-layered floor includes the case where half of one span of the indoor air conditioner is shifted in the vertical direction. Note that the division does not mean that it is physically divided by a wall or the like.

  The indoor air conditioner refers to an indoor unit, for example, in an air-cooled package type air conditioner, and is an indoor unit equipped with a coil in a central heat source type air conditioner. Therefore, the heat medium may be a refrigerant or cold water. The heat source device is an outdoor unit in the air-cooled package type air conditioner, and various refrigerators and heat storage devices can be used in the central heat source method.

  The indoor air conditioner may be an air conditioner that blows conditioned air into the underfloor chamber.

  The spare indoor air conditioner may be arranged at the center of a group of regular indoor air conditioners installed in the room. Here, the center means the center of the wall in the direction in which the indoor air conditioners are arranged, for example, when the indoor air conditioners are arranged at equal intervals along the wall of one side of the building.

  Furthermore, it has a heat storage tank which stores heat storage tank water, and each said air-conditioning system module and a preliminary | backup air conditioning system module are the heat medium-heat storage tank water heat exchanger which heat-exchanges the heat source from each heat-source device with heat storage tank water, respectively. The heat medium after heat exchange in the heat medium-heat storage tank water heat exchanger may be configured to be supplied to each indoor air conditioner.

  Furthermore, it has a cooling tower, and each said air-conditioning system module and a preliminary | backup air-conditioning system module are heat-medium-cooling water heat which heat-exchanges the heat medium from each indoor air conditioner, and the cooling water from the said cooling tower, respectively. You may comprise further an exchanger, and the heat medium after heat-exchanged in the said heat medium-cooling water heat exchanger may be comprised so that it may return to each said heat source apparatus.

  In the case of an air conditioning system having the heat storage tank, during normal operation, the heat source device of the standby system air conditioning module is operated, and the heat storage tank water heat exchanger is used to store heat in the heat storage tank water of the heat storage tank. May be.

  According to the present invention, in an air conditioning system constructed on a multi-story floor, redundancy of N + 1 or N + 2 can be reasonably ensured, and the construction amount of piping is also simplified from the conventional one described above. .

It is explanatory drawing which showed typically the side of the building to which the air conditioning system concerning embodiment was applied. It is explanatory drawing which showed typically the plane of the N-th floor room in the building of FIG. It is explanatory drawing which showed typically the side of the building to which the air conditioning system with a free cooling system and a thermal storage tank was applied.

  In the following, a preferred embodiment of the present invention will be described taking N + 1 redundancy as an example. FIG. 1 schematically shows a side surface of a building 1 to which an air conditioning system according to an embodiment is applied. The building 1 is a building having multiple floors from the first floor to the F floor (F: natural number). is there. The rooms R1 to RF on each floor are rooms that accommodate high heat-generating devices such as computers, servers, and other communication devices.

  In this building 1, the rooms R1 to RF basically have the same configuration. For example, the room RF on the F floor includes the indoor units AC1 to AC6 and the spare indoor unit RC as shown in FIG. Has been placed. Similarly, the indoor unit 1AC1 to 1AC6 and the spare indoor unit 1RC are provided in the room R1 on the first floor, and the indoor unit 2AC1 to 2AC6 and the spare indoor unit 2RC are provided in the room R2 on the second floor.

  As described above, the room RF on the F floor includes the indoor units AC1 to AC6 and the spare indoor unit RC. More specifically, the room RF on the F floor includes the indoor units AC1 to AC6 and the spare indoor unit RC. The indoor unit RC is arranged as shown in FIG. That is, the room RF is divided into unit air-conditioning regions U1 to U6 having a predetermined area, for example, an area of about 6 m × 10 m. In each of the unit air-conditioning areas U1 to U6, corresponding rack groups L1 to L6 in which rack rows 11 each configured by juxtaposing racks on which high heat generating devices are mounted are arranged to face each other.

  Each rack row 11 is disposed so that the front surfaces thereof face each other across the passage 12. That is, here, the passage 12 is a cold air suction surface of the rack, and a surface far from the longitudinal passage of the rack row 11 is a discharge surface of the heat exhaust. The maximum heat generation amount of each of the rack groups L1 to L6, that is, the sum of the maximum heat generation amounts of the high heat generating devices mounted on the racks of the rack groups L1 to L6 is equal between the rack groups L1 to L6. That is, in each rack row 11, a server as a high heat generating device is mounted for each stage of each rack, and the total maximum heat generation amount of the servers arranged for each of the unit air conditioning areas U1 to U6 is the unit air conditioning area U1. ~ U6 is substantially equal.

  And each indoor unit AC1-AC6 processes the thermal load of each unit air-conditioning area | region U1-U6, and indoor unit AC1-AC6 is respectively the largest calorific value of the corresponding unit air-conditioning area | region U1-U6. Have the ability to handle.

  The spare indoor unit RC does not have a unit air-conditioning area in particular, and the installation position thereof is the center of the indoor unit group, that is, the six indoor units AC1 to AC6, as shown in FIG. positioned.

  The division of the air-conditioning area by the unit air-conditioning areas U1 to U6 set in the room RF on the F floor, the configuration of the rack groups L1 to L6, and the arrangement of the indoor units AC1 to AC6 and the spare indoor units RC are as follows. It is set the same in each chamber from R1 to R (F-1). However, as long as the maximum heat generation amount of the unit air-conditioning regions U1 to U6 is equal, the types and number of high heat generation devices mounted on each rack may be different.

  In the present embodiment, the air conditioning of the multi-layer floors that are divided by the arrangement of the indoor units and the unit air-conditioning areas as described above are grouped with the indoor air conditioners on each floor located at the same position in the vertical direction of the multi-layer floor. More specifically, as shown in FIG. 1, the indoor units AC1... 2AC1 and 1AC1 responsible for the heat treatment of the unit air-conditioning region U1 in the room RF,. Heat medium is supplied to the indoor units AC1... 2AC1, 1AC1 in the first group G1 from the common heat source device E1 through the common forward pipe 21 and the return pipe 31 by one pump P1. The conditioned air is supplied into the room from each of the indoor units AC1,..., 2AC1, 1AC1. The supply of the heat medium to the indoor units AC1... 2AC1, 1AC1 and the recovery of the heat medium from these indoor units AC1. This is done through connected branch pipes. These indoor units AC1... 2AC1, 1AC1, outgoing pipe 21, return pipe 31, heat source device E1, and pump P1 belonging to the first group G1 constitute a first air conditioning system module.

  Similarly, the indoor units AC2-6... 2AC2-6... 2AC2-6, 1AC2-6 responsible for heat treatment of the unit air-conditioning regions U2-U6 in the rooms RF,. G6, the heat medium is supplied from a common heat source device E2-6 by one pump P2-6, each indoor unit indoor unit AC2-6 ... 2AC2-6, 1AC2-6, indoors Air-conditioned air is supplied. These indoor units AC2-6 ... 2AC2-6, 1AC2-6, belonging to the second group G1 to the sixth group G6, each outgoing pipe 21, each return pipe 31, each heat source device E2-6, each pump P2-6 And the 2nd-6th air conditioning system module is comprised.

  Then, for the spare indoor units RC,..., 2RC, 1RC in the rooms RF,..., R2, R1, the heat medium is supplied from the common heat source device ER by the pump PR, and each spare indoor unit RC,.・ ・ Air-conditioned air is supplied indoors from 2RC and 1RC. These constitute a spare group GR. The indoor unit RC, the outgoing pipe 21, the return pipe 31, the spare heat source device ER, and the pump PR that belong to the spare group GR constitute a spare air conditioning system module.

  This embodiment has six air conditioning system modules and one preliminary air conditioning system module as described above.

  Further, in the present embodiment, the heat source devices E1 to E6 and the standby heat source device ER have a configuration that generates cold water as a central heat source device and supplies the cold water to the indoor unit. Adopting air temperature control, each indoor unit is regarded as one plenum, and is operated with parallel air supply control (the same air supply for all indoor units) and constant supply air temperature control. Is done. In this case, for example, the air supply amount is controlled in accordance with the heat generation status of the server mounted on the rack. If necessary, for example, the state of thermal contamination in each room (the temperature on the rear side of the rack in accordance with FIG. 2) may be detected, and the air supply amount control may be performed individually.

  The present embodiment has the above-described configuration. For example, in the room RF on the F floor, when the indoor unit AC3 fails, the spare indoor unit RC operates and the unit air conditioning that the indoor unit AC3 is responsible for Air conditioned air corresponding to the area U3 is supplied. That is, when the whole room RF is looked down, the whole room RF becomes one plenum, and when the indoor unit AC3 stops due to a failure or the like, the spare indoor unit RC can be operated to supplement that amount. it can.

  At this time, even if the indoor unit 1AC2 in the room R1 on the other floor, for example, the first floor, fails at the same time, the spare indoor unit 1RC operates, and the unit air conditioning region U2 that the indoor unit 1AC2 was responsible for Air-conditioned air is supplied. The same applies until one of the heat source devices E1 to E6 that bears the module in the vertical direction breaks down or the vertical pipe of the module is damaged and replaced. Furthermore, not only in such a failure, but also in the case of stopping by maintenance or the like.

  Therefore, according to the present embodiment, even if one indoor unit fails in each of the rooms R1 to RF on the first floor to the F floor, the spare indoor unit on each floor is operated at the same time to cope with this. Is possible. That is, so-called N + 1 redundancy is always ensured in all floor rooms.

  Moreover, in order to ensure such redundancy, the pipes of the heat source device and the indoor unit are constituted by common pipes (outward pipe 31 and return pipe 32), which is simplified from the conventional one. Therefore, maintenance and management are easy.

  In the present embodiment, since the spare indoor unit is located in the center of the six indoor units AC1 to AC6 in each room, if any of the regular indoor units AC1 to AC6 fails, It is easy to supply conditioned air to the unit air-conditioning area that the indoor units AC1 to AC6 have been carrying. When constructing a duct that directly supplies conditioned air to the unit air conditioning area, the construction amount is small. In addition, the amount of piping is reduced as compared with the prior art in which horizontal piping or the like is duplicated between the heat source device and the indoor unit.

  The indoor air conditioner of the above-described embodiment is of a type that blows out conditioned air directly into the room, but may be one that blows conditioned air into the underfloor chamber instead.

  In the above embodiment, the spare indoor unit RC and the spare heat source device ER have been described in accordance with an example in which they are normally stopped. However, the spare indoor unit RC and the spare heat source device ER are added for leveling. You may make it operate in normal time. For example, in the room on each floor, in contrast to the above-described embodiment in which one indoor unit is responsible for 1/6 of the capacity, by operating the spare indoor unit RC and the spare heat source device ER, the indoor unit is 7 In this case, each indoor unit including the spare indoor unit RC is operated at about 83%. And at the time of failure, it is good also as a 100% driving | operation, respectively. As a result, it is possible to ensure a reasonable redundancy.

  The above embodiment is a system configuration for ensuring N + 1 redundancy. However, in order to ensure N + 2 redundancy, the indoor unit RC, the forward pipe 21, the return pipe 31, the preliminary heat source device ER, and the pump PR are used. One additional preliminary air-conditioning system module may be added.

  By the way, in a system that realizes this type of high availability, it would be extremely beneficial in an actual operation situation if a system capable of further reducing energy consumption and responding to power outages in the short term is constructed.

  In order to realize this, the example shown in FIG. 3 schematically shows a side surface of the building 101 using water-based free cooling (utilization of outside air cooling) and a heat storage tank. This building has multiple floors from the first floor to the F floor. The rooms R1 to RF on the ground floor are rooms for storing high heat generating devices such as computers, servers, and other communication devices, and a heat storage tank 102 is provided in the room UR1 on the first basement floor. As the heat storage tank 102, a temperature stratification type is suitable.

  In the building 101, the rooms R1 to RF basically have the same configuration as the building 1 described above. For example, a plurality of indoor units 1AC and a spare indoor unit 1RC are installed in the room R1 on the first floor. In the room RF on the F floor, a plurality of indoor units AC and spare indoor units RC are installed. Moreover, although illustration is abbreviate | omitted, the room R1-RF is divided into the unit air-conditioning area | region which has predetermined | prescribed area similarly to the above-mentioned building 1, Each high-heat-generation apparatus is mounted in each unit air-conditioning area | region. Corresponding rack groups in which rack rows configured by juxtaposing racks are arranged to face each other are located. And the total maximum calorific value of the server arrange | positioned for every unit air-conditioning area is substantially equal between each unit air-conditioning area. As the indoor unit AC in this case, a unit that uses a liquid such as water or brine as a heat source, such as a fan coil unit, an air handling unit, or a water heat source heat pump unit, can be adopted.

  As in the previous embodiment, the air conditioning of the multi-layer floors that are divided by the arrangement of the indoor units and the unit air-conditioning areas is grouped by grouping the indoor air conditioners on each floor located at the same position in the vertical direction of the multi-layer floor. ,... Indoor unit AC... 1AC1 responsible for heat treatment in the unit air-conditioning region in R1 is set as the first group G1. In the first group G1, a common heat source device E1 is installed on the roof, for example, and the heat source water as the heat medium supplied through the pipe 103 by the pump P1 is exchanged between the heat source water and the heat storage tank water in the first group G1. It is supplied to a plurality of indoor units AC... AC1 in the first group G1 from the pipe 104 through the branch pipe through the vessel H1. Then, using the supplied heat source water, conditioned air is supplied into the room by the fan 105 from each indoor unit AC... 1AC.

  A water intake pipe 111 and a return pipe 121 are connected to the heat source water-cooling water exchanger H1. The intake pipe 111 is branched into an upper intake pipe 111 a that takes in the heat storage water near the top of the heat storage tank 102 and a lower intake pipe 111 b that takes in the heat storage water near the bottom of the heat storage tank 102. The intake pipe 111 is provided with a water intake pump 112, and the upper intake pipe 111a and the lower intake pipe 111b are provided with corresponding valves V1 and V2, respectively. The return pipe 121 is branched into an upper return pipe 121 a that discharges water near the top of the heat storage tank 102 and a lower return pipe 121 b that discharges water near the bottom of the heat storage tank 102. The upper return pipe 121a and the lower return pipe 121b are provided with corresponding valves V3 and V4, respectively.

  The recovery of the heat source water from the indoor unit AC... 1AC is performed through the pipe 106 through the branch pipes. The heat source water supply pipe 104 and the heat source water recovery pipe 106 are connected to the heat source water inlet side pipe 131 of the heat source water-cooling water exchanger H2, and the heat source water-cooling water exchanger H2 is connected. The pipe 132 on the heat source water outlet side is connected to the inlet side of the heat source device E1. The pipes 104 and 106 are provided with valves V5 and V6, respectively.

  And the piping 143 of the cooling water supplied by the pump 142 from the cooling tower 141 is connected to the cooling water inlet side of the heat source water-cooling water exchanger H2, and the cooling water outlet side of the heat source water-cooling water exchanger H2 is connected. Is connected to a pipe 144 for returning the cooling water heated in the heat source water-cooling water exchanger H2 to the cooling tower 141.

  The fan 105, the pump 112, the pump P1, and the valves V1 to V6 are supplied with power from the emergency power supply device 151 provided on each floor, and the power from the emergency power supply device 151 is received during a power failure. Supplied and operation is guaranteed.

  These indoor units AC ... AC1, pipes 103, 104, 106, heat source device E1, pump P1, heat source water-heat storage tank water exchanger H1, water intake pipe 111, pump 112, return pipe 121, belonging to the first group G1 The heat source water-cooling water exchanger H2 and the pipes 131 and 132 constitute a first air conditioning system module.

  On the other hand, for the spare indoor units RC,... 1RC in the room RF,... R1, heat source water is supplied from the common heat source device ER by the pump PR as in the first group, and each spare The indoor unit RC,... 1RC is supplied with conditioned air into the room. These constitute a spare group GR. And these indoor unit RC ... 1RC, piping 103,104,106, heat source apparatus ER, pump PR, heat source water-heat storage tank water exchanger RH1, belonging to the spare group GR, intake pipe 111, pump 112, return pipe 121 The heat source water-cooling water exchanger RH2 and the pipes 131 and 132 constitute a preliminary air conditioning system module.

  The example shown in FIG. 3 has the above-described configuration. Compared with the above-described embodiment, first, for each heat source device E1... ER, heat exchange with cooling water from the cooling tower 141 is performed. After the heat source water is supplied. Therefore, in the summer and intermediate periods, the heat source water can be pre-cooled by free cooling with the cooling water from the cooling tower 141, and the load on each heat source device E1,... ER can be reduced. In winter, the power consumption of the entire system can be further reduced by cooling the heat source water only by free cooling using cooling water from the cooling tower 141.

  Recent IT equipment such as servers has been improved in performance, and the temperature condition of the installed room has been relaxed to the high temperature side, so the heat source water can be obtained only by free cooling by the cooling water from the cooling tower 141. Even if cooled, it is possible to exhibit sufficient performance, and its practicality is high.

Further, according to the inventor's estimation, a large temperature difference in the heat source water circulation system can be reasonably realized. That is, the IT equipment recommended suction temperature is relaxed and changed to 18 to 27 ° C. in 2008 due to the performance improvement of the IT equipment described above. Further, the temperature of the exhaust air from the IT equipment generally rises at Δt = 10 deg. For example, when the suction temperature of the IT equipment is 26 ° C., exhaust air of 36 ° C. is generated.
On the other hand, the cooling water temperature in summer can be supplied at 29 ° C., and heat exchange with the exhaust air of IT equipment at 36 ° C. is possible. And when the cooling tower inlet temperature of circulating water (cooling water) is 33 degreeC, if the cooling tower outlet temperature shall be 29 degreeC, after heat-exchange with heat source water after that, circulating water (for example, refrigeration machine) The outlet temperature of the heat source water) can be 18 ° C., and a large temperature difference of 15 deg can be obtained.

  Furthermore, since the free cooling using a single cooling tower 141 is rationally connected to the heat source devices E1,... ER, which are distributed heat source devices, free cooling can be performed under a simple piping system. We use effectively.

  Of course, the heat source water having a predetermined low temperature may be supplied to the indoor units AC,... RC,..., 1AC... 1RC on each floor as it is, but in the example shown in FIG. The heat source water from the heat source device E1... ER is temporarily exchanged with the heat source water in the heat storage tank 102 by the heat source water-heat storage tank water exchanger H1 and the heat source water-heat storage tank water exchanger RH1. , RC,..., 1AC... 1RC. Therefore, even if each heat source device E1... ER is stopped at the time of a power failure, by taking out the cold heat in the heat storage tank 102, the indoor units AC,... RC,. Thus, it is possible to supply low-temperature heat source water.

  In the example of FIG. 3, the heat source water-heat storage tank water exchanger H1 and the heat source water-heat storage tank water exchanger RH1 of each group G1,... GR are pumps P1,. In addition, since the valves V1 to V6 of the intake pipe 111 and the return pipe 121 can be supplied with power from the emergency power supply device 151, in the event of a power failure, The cold heat in the heat storage tank 102 is taken out, the low-temperature heat source water is supplied to the indoor units AC,..., RC,. Is possible.

  In addition to the pump P1,... PR, the water intake pump 112, the intake pipe 111, the valves V1 to V4 of the return pipe 121, the valves V5, V6, and the supply fan 105 are all heat source devices E1. ..,..., And far less power consumption than ER, it is possible to sufficiently perform the air-conditioning operation with the electric power from the emergency power supply device 151. As a matter of fact, in the event of a power failure, power supply to the server or the like has the highest priority, so there is a limit to the amount of power supplied from the emergency power supply 151. Therefore, the example shown in FIG. 3 is very practical.

  The heat release operation of the heat storage tank water at the time of such a power outage is as follows: the valves V1, V4, V5 are closed, the valves V2, V3, V6 are opened, and the low temperature heat storage near the bottom in the heat storage tank 102 from the bottom intake pipe 111b. The heat storage tank water that has been taken up and heated by the heat source water-heat storage tank water exchanger H1 is returned to the upper part in the heat storage tank 102 from the upper return pipe 121a.

  Also in the example of FIG. 3, since the preliminary air conditioning system module is provided, even if the indoor unit AC,..., 1AC on each floor breaks down, the spare indoor unit RC is operated to compensate for that. N + 1 redundancy is ensured.

  Further, in the normal operation, the preliminary air conditioning system module may be suspended, but may be always operated for heat storage operation. In this case, the valves V1, V4, V5 are opened, the valves V2, V3, V6 are closed, the relatively high temperature heat storage tank water in the heat storage tank 102 is taken from the upper intake pipe 111a, and the heat source water-heat storage tank water is taken. The heat storage tank water cooled by the exchanger RH1 is returned to the vicinity of the bottom in the heat storage tank 102 through the bottom return pipe 121b, whereby the heat storage operation is performed. Therefore, it is possible to effectively utilize the preliminary air conditioning system module installed for ensuring redundancy without suspending. Furthermore, in the example shown in FIG. 3, since the other air conditioning modules can each perform a heat storage operation, the system is flexible. That is, when a preliminary air conditioning system module is necessary, the possibility that the preliminary air conditioning system module has failed cannot be denied. Moreover, it can be assumed that the preliminary air-conditioning system module is not specified, for example, periodically rotated and operated. In such a case, as in the example shown in FIG. 3, other air-conditioning modules can be suitably accommodated by configuring each of the air conditioning modules to be capable of performing a heat storage operation.

  The heat radiation operation and the heat storage operation as described above are performed by switching the valves V1 to V6 as described above.

  Although not shown in the drawings, heat source water-heat storage tank water exchanger H1,... RH1, heat source water-heat storage tank water exchanger H2,... The pressure loss of the circulation system can be reduced.

  In addition, the supply of heat source water to each indoor unit AC,..., 1AC, and spare indoor unit RC is a bleed-in method, so that the temperature difference of the heat source water flowing through the pipes 104 and 106 is reliably maintained, Along with this, the reduction of water circulation power and the effective use of free cooling heat increase.

  In addition, in the example shown in FIG. 3, although the system using the free ring using the cooling tower 141 and the response system at the time of power failure using the heat storage tank 102 are used together, both systems need to be used together. However, for example, only a system using free ring using the cooling tower 141 may be adopted, or a system using only a response system at the time of power failure using the heat storage tank 102 may be constructed.

  INDUSTRIAL APPLICABILITY The present invention is useful for an air conditioning system in the case where a multilayer floor is used as an IT equipment room such as a computer room or a server room.

1 Building 11 Rack row 12 Passage 21 Outgoing pipe 31 Return pipe AC1-AC6 Indoor unit RC Spare indoor unit R1, R2, RF room E1-E6 Heat source device ER Preliminary heat source device P1-P6, PR pump V1-V6 Valve

Claims (6)

A system for air-conditioning a facility having a room in which a plurality of high heat generating devices are installed on two or more layers,
Each room on each floor is divided into a plurality of unit air-conditioning areas having approximately the same maximum heat generation amount in which one or more high heat-generating devices are arranged,
It has the ability to process the maximum heat generation amount of the unit air-conditioning area, and has an indoor air conditioner that blows conditioned air into the room for each unit air-conditioning area,
The indoor air conditioners on each floor located at substantially the same position in the vertical direction of the multilayer floor are grouped, and each group has a heat source device that supplies a heat medium to the indoor air conditioners in the group through a common pipe,
One air conditioning system module is composed of the heat source device for each group, common piping, and indoor air conditioners on each floor,
Furthermore, a spare indoor air conditioner provided on each floor located at substantially the same position in the vertical direction of the multilayer floor, and a spare heat source device for supplying a heat medium through a common pipe to these spare indoor air conditioners; An air conditioning system for a facility having a plurality of floors, comprising one or two preliminary air conditioning system modules configured by: 2. The air conditioning system for a facility having a plurality of floors according to claim 1, wherein the indoor air conditioner is an air conditioner that blows conditioned air into an underfloor chamber. The air conditioning system for a facility having a plurality of floors according to claim 1 or 2, wherein the spare indoor air conditioner is arranged in the center of a group of indoor air conditioners installed in the room. It has a heat storage tank that stores heat storage tank water,
Each of the air conditioning system modules and the preliminary air conditioning system module further includes a heat medium-heat storage tank water heat exchanger that exchanges heat between the heat source from each heat source device and the heat storage tank water,
The heat medium after heat exchange in the heat medium-heat storage tank water heat exchanger is configured to be supplied to each of the indoor air conditioners. An air conditioning system for a facility having multiple floors as described in 1. A cooling tower,
Each of the air conditioning system modules and the preliminary air conditioning system module further includes a heat medium-cooling water heat exchanger for exchanging heat between the heat medium from each indoor air conditioner and the cooling water from the cooling tower,
It is comprised so that the heat medium after heat-exchanged in the said heat medium-cooling water heat exchanger may be returned to each said heat-source device, The one in any one of Claims 1-4 characterized by the above-mentioned. Air conditioning system for facilities with multiple floors. It is an operating method of the air-conditioning system according to claim 4,
During normal operation, the heat source device of the standby system air conditioning module is operated, and the heat storage tank water heat exchanger is used to store heat in the heat storage tank water of the heat storage tank.

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