JP4805065B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system that is suitable for use in a building that has a large heat load generated internally throughout the year and, as a result, requires a relatively long period of time for cooling.

  In buildings where many office automation equipment such as computers are placed, the heat load generated inside is large, so even if the building is constructed in a cool climate area, it is long throughout the year. It is necessary to cool the room over a period of time. For this reason, in this kind of building, there exists a problem that the energy cost required for the operation of an air conditioner increases.

  Therefore, conventionally, as shown in FIG. 5, an air conditioner refrigerator (heat pump) 1 and an indoor side that performs cooling or heating in a building with a cooling liquid or a high-temperature liquid supplied from the refrigerator 1 through a pump 2. In an air conditioning system provided with an air conditioner 3, there is known an apparatus that attempts to reduce the operating load of a refrigerator by adding an outside air cooling function 4 to the air conditioner 3.

  However, in the above air conditioning system, since the outside air cooling function 4 directly uses outside air having a small heat capacity, it is difficult to obtain a large energy saving effect. For this reason, especially when the space in the building is large, there is a problem that if the refrigerator 1 is stopped, a desired cooling effect cannot be obtained.

  Therefore, for example, as can be seen in the following Patent Document 1, a refrigerator (heat pump), an air conditioner including a cooling coil that uses a refrigerant from the refrigerator, and cooling for cooling the condenser of the refrigerator. It has air conditioning equipment consisting of a cooling tower that supplies water, and an underfloor chamber is provided under the floor of the computer room to be cooled, and the conditioned air supplied from the air conditioner to the underfloor chamber through the air supply duct The cooling air is blown out from the floor outlet formed in the computer room into the computer room, and the return air from the computer room is pre-cooled by heat exchange with the cooling water from the cooling tower in the cooler, and then the cooling is performed. There has been proposed an air conditioning system in which processing is performed by a coil.

  According to the conventional air-conditioning system having the above-described configuration, the cooling air having a large heat capacity cooled by the outside air in the cooling tower is used for precooling the return air from the condenser and the computer room of the refrigerator. There is an advantage that the operation load of the air conditioner or the air conditioner can be reduced.

However, even in the air conditioning system, there is a problem that the energy cost still increases because it is necessary to always operate the refrigerator and the air conditioner during the period in which the air conditioning in the computer room is necessary.
JP 2002-61911 A

  The present invention has been made in view of such circumstances, and by using a cooling tower and a heat pump, it is possible to select an optimal air-conditioning mode according to the outdoor air conditions and the required amount of heat load in the building, and thus significant energy saving. It is an object of the present invention to provide an air conditioning system that can achieve the optimization.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that cooling water is incorporated into a floor-embedded air conditioning system that is incorporated in a floor of a building and has a floor surface as a heat radiation surface, and heat exchange with outside air. A cooling tower to be stored; a heat pump for discharging a coolant as a heat medium; a cooling water circulation line capable of circulatingly supplying the cooling water in the cooling tower to the floor-embedded air conditioning facility; and the heat discharged from the heat pump. Ri name and a circulation supplying the heat pump air conditioner line as a heat source of the floor embedded air conditioning medium, the floor of the floor embedded air conditioning equipment, hitting a concrete deck plates recesses plural rows are formed On the floor slab, the air-conditioning pipe through which the cooling water is circulated and supplied without providing a heat insulating material is placed to place lightweight concrete and the deck pre- The sound absorbing material is provided in the plurality of recesses formed on the lower surface of the floor slab by removing the deck plate, and a metal porous plate is fixed to the lower surface. and the lower surface side of the floor slab are those characterized that you have been a skeleton ceiling without the ceiling.

  Here, in the invention according to claim 2, a heat exchanger is interposed in the heat pump air conditioning line, and the cooling water circulation line is used to exchange heat by sending the cooling water to the heat exchanger. A first bypass line that supplies the floor-embedded air conditioning facility and a second bypass line that bypasses the cooling water from the cooling tower are provided.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the cooling water circulation line includes a manifestation of cooling water flowing through the cooling water circulation line in parallel with the floor-embedded air conditioning facility. An air conditioner for performing air conditioning by directly supplying air for air conditioning into the building using heat is connected.

In the air conditioning system in any one of Claims 1-3 , as a heat source of floor-embedded air conditioning equipment, the cooling water of the cooling tower cooled by heat exchange with external air, the cooling liquid discharged from a heat pump, or high temperature The liquid can be selectively used. Therefore, when the cooling load during the daytime in summer is at its peak, the coolant from the heat pump is used as a heat source for the floor-mounted air conditioning system (cooling peak mode). When the load is small, the heat pump can be stopped and the cooling water from the cooling tower using the outside air effectively can be used as the heat source of the floor-embedded air conditioning equipment (cooling intermediate period mode).

In these intermediate periods, the cooling water from the cooling tower is mainly used as a heat source for the floor-embedded air conditioning facility, and the coolant from the heat pump can be used complementarily.
Further, when the heat pump can switch and discharge the cooling liquid and the high-temperature liquid, heating can also be performed by using the high-temperature liquid from the heat pump as a heat source of the floor-embedded air conditioning equipment in winter (heating). mode).

  In addition, in the present invention, in particular, the floor-embedded air conditioning equipment that is incorporated in the floor of the building as the air conditioning equipment and uses the floor surface as a heat radiating surface is used, and cooling water from a cooling tower having a large heat capacity is used as the heat medium. Therefore, even when the temperature difference between the room temperature and the cooling water is small, the room can be efficiently cooled.

  As a result, the optimum air conditioning mode described above can be selected according to the outside air conditions and the required amount of heat load in the building, and thus, a significant energy saving can be achieved by shortening the operation time of the heat pump. Can do.

  At this time, according to the second aspect of the present invention, the cooling water is sent to the heat exchanger by opening the first bypass line and the second bypass line and passing the cooling water in the cooling water circulation line. The cooling peak mode can be operated by exchanging heat with the coolant supplied from the heat pump and circulatingly supplying it to the floor-embedded air conditioning equipment.

  In addition, by closing the first bypass line and the second bypass line and stopping the heat pump, the cooling water from the cooling tower is circulated and supplied to the floor-embedded air conditioning facility, and the operation in the cooling intermediate period mode is performed. It can be carried out.

  Further, by closing the first bypass line and opening the second bypass line, the cooling water from the cooling tower is circulated and supplied to the floor-embedded air conditioning equipment, and sent from the second bypass line to the heat exchanger. Thus, the cooling liquid from the heat pump can be used complementarily for cooling the cooling water.

  Further, as in the cooling peak mode, the first bypass line and the second bypass line are opened, and high-temperature water is sent from the heat pump to the heat exchanger, so that the cooling water in the cooling water circulation line is changed to hot water. The operation in the heating mode can be performed.

  Further, according to the invention described in claim 3, the cooling water circulation line is directly used for air conditioning in the building using the sensible heat of the cooling water flowing through the cooling water circulation line in parallel with the floor-embedded air conditioning equipment. In addition to the above-described floor-embedded air conditioning equipment that uses the floor surface as a heat radiating surface because air is connected to perform air conditioning, the cooling tower and / or heat pump is also selectively used by the air conditioner. Air conditioning in the room used for

Conventionally, as a floor structure provided with the above-described floor-embedded air conditioning system, a structure as shown in FIG. 6 has been widely used.
In this floor structure, a floor slab 5 is formed by placing concrete on a deck plate 5a in which a plurality of recesses are formed, and a heat insulating material 6 is constructed on the floor slab 5, and the heat insulating material. A cold / hot water pipe 7 is arranged on the surface 6 and a lightweight concrete 8 is placed therein, thereby being embedded in the lightweight concrete 8.

  The conventional floor structure having the above-described configuration is used for cooling or heating by radiating the heat of the cold / hot water passed through the cold / hot water pipe 7 from the lightweight concrete 8 to the upper floor room, and from a highly sound-absorbing material. If the ceiling 9 is not present, the sound absorbing material 10 is attached to the lower surface of the deck plate 5a.

  In the floor-embedded air conditioning system provided in such a floor structure, although heat dissipation to the room on the upper floor is large, heat transfer to the lower floor slab 5 is hindered by the heat insulating material 6, Furthermore, since the sound absorbing material 10 and the ceiling 9 are provided on the entire surface, the heat radiation to the lower floor is extremely small.

On the other hand, according to the first to third aspects of the invention, the air conditioning pipe constituting the floor-embedded air conditioning facility is embedded in the floor concrete, and a heat insulating material is provided below the air conditioning pipe. Therefore, the heat transmitted from the air conditioning pipe to the floor concrete can be dissipated from the upper surface and the lower surface of the floor to the upper floor and the lower floor, respectively. In addition, by transferring heat from the air conditioning piping to the floor concrete, floor concrete with a large heat capacity can be used as a heat storage body, so that the heat energy can be effectively used to further save energy. Is possible.

Moreover, removing the deck plate 5 shown in FIG. 6, and not provided ceiling 9, a so-called skeleton ceiling, and provided with a sound absorbing material to a plurality of recesses formed on the lower surface of the floor concrete, punching panel or the like to the lower surface By fixing a metal plate that has a large number of holes and is excellent in heat conductivity, both desired sound insulation and heat dissipation can be secured. In addition, the metal plate can prevent the sound absorbing material provided in the recess from being detached or dropped.

Hereinafter, the best embodiment of the air-conditioning system according to the present invention will be described with reference to FIGS.
This air conditioning system includes an air conditioning pipe (floor embedded air conditioning equipment) 12 embedded in a floor 11 of a building, an air conditioner 13 provided in parallel with the air conditioning pipe 12, and cooling water stored therein. A sealed cooling tower 14, an air-cooled heat pump chiller (heat pump) 15, and cooling water circulation lines (16 a, 16 b) for circulatingly supplying the cooling water in the sealed cooling tower 14 to the air conditioning pipe 12 and the air conditioner 13. The heat medium discharged from the air-cooled heat pump chiller 15 is generally configured from heat pump air-conditioning lines (17a, 17b) that circulate and supply the air-conditioning pipe 12 and the air source 13 as a heat source.

  Here, the air conditioner 13 uses the sensible heat of the cooling water introduced from the supply pipe 16a of the cooling water circulation line to send air conditioning air directly into the building for air conditioning. The closed cooling tower 14 cools the internal cooling water by exchanging heat with the outside air, and is connected to a supply pipe 16a and a return pipe 16b of the cooling water circulation line. The supply pipe 16a is provided with an opening / closing valve 18, and a bypass line (second line) that bypasses the hermetic cooling tower 14 downstream of the opening / closing valve 18 between the supply pipe 16a and the return pipe 16b. 19) is provided via an on-off valve 19a.

  The supply pipe 16 a of the cooling water circulation line is provided with a circulation pump 20 for circulating the internal cooling water, and an opening / closing valve 21 is interposed on the discharge side of the circulation pump 20. Moreover, on the outlet side of the cooling water from the air conditioning pipe 12 and the air conditioner 13, on-off valves 22 and 23 are provided, respectively, and a return pipe 16b of the cooling water circulation line is connected to the on-off valves 22 and 23. .

  On the other hand, the air-cooled heat pump chiller 15 is for selectively discharging a cooling liquid or a high-temperature liquid as a heat medium, and a supply pipe 17a of a heat pump air conditioning line is connected to the discharge side. The supply pipe 17 a is provided with a circulation pump 25, and is branched into two branches on the downstream side, and one of the supply pipes 17 a is introduced as a heat source of the outside air processing air conditioner 26.

  This outside air processing air conditioner 26 is for absorbing and controlling fluctuations in the temperature and humidity of the outside air, and a return pipe 17b of the heat pump air conditioning line is connected to the discharge side thereof. The return pipe 17b is introduced into the first heat exchanger 28 via the on-off valve 27. The return pipe 17b is provided with a bypass line 17c capable of adjusting the flow rate of the heat medium to the first heat exchanger 28. The bypass line 17c and the outlet side of the first heat exchanger 28 A three-way valve 29 is interposed at the connecting portion.

Further, the other of the branched supply pipes 17 a is introduced into the second heat exchanger 30, and the outlet side of the second heat exchanger 30 is returned to the air-cooled heat pump chiller 15 via the on-off valve 31. 17b.
A bypass line (for supplying cooling water to the first and second heat exchangers 28 and 30 and cooling or raising the temperature by the heat medium from the air cooling heat pump chiller 15 is supplied to the supply pipe 16a of the cooling water circulation line. A first bypass line 32 is provided.

  The bypass line 32 is branched from the discharge side of the circulation pump 20 provided in the supply pipe 16a of the cooling water circulation line, and the first heat exchanger 28 and the second heat are sequentially supplied via the on-off valve 33. The second heat exchanger 30 is introduced into the exchanger 30, and the outlet side of the second heat exchanger 30 is connected to the downstream side of the on-off valve 21 interposed in the supply pipe 16a.

  Next, based on FIG. 4, the air conditioning pipe (floor embedded air conditioning equipment) 12 and the floor structure in which the air conditioning pipe is embedded in the air conditioning system will be described. The floor structure is on the deck plate on which a plurality of recesses are formed. The floor slab 32 is formed by placing ordinary concrete on the floor, and the lightweight concrete 33 is placed on the floor slab 32 by arranging the air conditioning pipe 12 without providing a heat insulating material. The lower surface side of the floor slab 32 is a skeleton ceiling in which the deck plate is removed and a ceiling is not provided.

  A plurality of recesses on the lower surface of the floor slab 32 formed by the removed deck plate are filled with a sound absorbing material 34, and a plurality of holes are formed in the lower surface of the floor slab 32. A metal punching panel (perforated plate) 35 is fixed.

  In the air conditioning system having the above-described configuration, the cooling water discharged from the cooling tower 14 and the air cooling heat pump chiller 15 is used as a heat source for the air conditioning pipe 12 embedded in the floor 11 and having the floor surface as a heat radiating surface. Or by selectively using a high temperature liquid, various air-conditioning modes as shown to FIGS. 1-3 etc. can be taken. For reference, the temperature of the line in each mode is illustrated in these drawings.

  First, as shown in FIG. 3, when the cooling load is peak during the daytime in summer, the on-off valves 18 and 21 are closed to stop the supply of cooling water from the cooling tower 14 and the on-off valves 19a and 33 are opened. By allowing it to flow, distribution to the bypass lines 19 and 32 is made possible.

  When the circulation pumps 20 and 25 are operated and the air cooling heat pump chiller 15 is in a cooling operation, the cooling water in the cooling water circulation lines 16a and 16b is sequentially supplied from the bypass line 32 to the first and second heat exchangers 28 and 28, 30. On the other hand, a part of the cooling liquid from the air-cooled heat pump chiller 15 is sent from the supply pipe 17a of the heat pump air conditioning line to the outside air processing air conditioner 26 and used as a cooling medium, and then sent to the first heat exchanger 28. The first stage of the cooling water is then cooled. The other part from the supply pipe 17a is directly sent to the second heat exchanger 30 to further cool the cooling water after the first stage cooling in the first heat exchanger 28. In this way, the coolant that has passed through the first and second heat exchangers 28 and 30 is returned again to the air-cooled heat pump chiller 15 from the return pipe 17b.

  On the other hand, the cooling water cooled in the first and second heat exchangers 28 and 30 is supplied to the air conditioning pipe 12 and the air conditioner 13 from the supply pipe 16a of the cooling water circulation line. Thereby, the interior of the building is cooled. The cooling water that has passed through the air conditioning pipe 12 and the air conditioner 13 is circulated and supplied again from the return pipe 16b through the bypass line 19 by the circulation pump 20. Thereby, the air conditioning by the cooling peak mode can be performed.

  On the other hand, when the cooling load is relatively small such as at night in summer or spring and autumn, the on-off valves 19a and 33 are closed and the on-off valve 21 is opened to cool the bypass lines 19 and 32 as shown in FIG. Keep out of water. Further, the operation of the air cooling heat pump chiller 15 and the outside air processing air conditioner 26 is stopped.

  Then, the cooling water in the hermetic cooling tower 14 cooled by the outside air is supplied from the supply pipe 16a of the cooling water circulation line to the air conditioning pipe 12 and the air conditioner 13 by the circulation pump 20. To be cooled. The cooling water that has passed through the air conditioning pipe 12 and the air conditioner 13 is returned to the sealed cooling tower 14 from the return pipe 16b. Thereby, the air conditioning by the cooling intermediate period mode can be performed.

  Further, in these intermediate periods, as shown in FIG. 2, the cooling water is circulated between the hermetic cooling tower 14, the air conditioning pipe 12 and the air conditioner 13 by keeping the bypass line 19 closed. In parallel with this, the bypass line 32 is opened, and the air-cooled heat pump chiller 15 is operated to cool the cooling water using the second heat exchanger 30. Thus, the coolant from the air-cooled heat pump chiller 15 can be used complementarily.

In addition, when heating the inside of a building in winter, it can be performed by heating the air-cooled heat pump chiller 15 in the open / close state of the on-off valve shown in FIG.
As described above, in the air conditioning system, air conditioning air is directly supplied into the building using the sensible heat of the cooling water introduced from the supply pipe 16a of the cooling water circulation line as the air conditioning equipment. Along with the air conditioner 13 that performs air conditioning, the air conditioning pipe 12 that is incorporated in the floor 11 of the building and has the floor surface as a heat radiating surface is used, and the cooling water from the sealed cooling tower 14 having a large heat capacity is used as the heat medium. Therefore, even when the temperature difference between the room temperature and the cooling water is small, the room can be efficiently cooled.

  As a result, the optimum air conditioning mode described above can be selected according to the outdoor air condition and the required amount of heat load in the building. Therefore, by shortening the operation time of the air-cooled heat pump chiller 15, significant energy saving can be achieved. Can be achieved.

  In addition, as shown in FIG. 4, the air conditioning pipe 12 is embedded in the concrete floor 11 and a heat insulating material is not provided below the air conditioning pipe 12. The heat transmitted to the concrete floor 11 made of the slab 32 can be dissipated from the upper surface and the lower surface of the floor 11 to both the upper floor and the lower floor. In addition, by transferring heat from the air conditioning pipe 12 to the floor 11, concrete having a large heat capacity can be used as a heat storage body. Therefore, it is possible to achieve further energy saving by effectively using thermal energy. .

  Furthermore, since the sound absorbing material 34 is provided in a plurality of recesses formed on the lower surface of the floor slab 32 and the punching panel 35 having a large number of holes formed on the lower surface of the floor slab 32 is fixed, a desired soundproofing is achieved. Both the heat dissipation and the heat dissipation can be ensured, and the punching panel 35 can prevent the sound absorbing material 34 provided in the recess from being detached or dropped.

It is a block diagram which shows the driving | running state by air_conditioning | cooling intermediate period mode in embodiment of the air conditioning system of this invention. It is a block diagram which shows the operation state of the intermediate period in the air conditioning system of FIG. It is a block diagram which shows the driving | running state by the air_conditioning | cooling peak mode in the air conditioning system of FIG. It is a longitudinal cross-sectional view which shows the piping for air conditioning in the air conditioning equipment of FIG. 1, and the floor structure which embedded this. It is a schematic block diagram which shows the conventional air conditioning system. It is a longitudinal cross-sectional view which shows the conventional cold / hot water pipe and the floor structure which embedded this.

Explanation of symbols

11 Floor 12 Air conditioning piping (floor embedded air conditioning equipment)
14 Sealed cooling tower 15 Air-cooled heat pump chiller (heat pump)
16a Cooling water circulation line supply pipe 16b Cooling water circulation line return pipe 17a Heat pump air conditioning line supply pipe 17b Heat pump air conditioning line return pipe 19 Bypass line (second bypass line)
28 1st heat exchanger 30 2nd heat exchanger 32 Bypass line (1st bypass line)
34 Sound absorbing material 35 Punching panel (metal perforated plate)

Claims (3)

A floor-embedded air conditioning system that is built into the floor of a building and has a heat radiating surface, a cooling tower in which cooling water is stored by heat exchange with the outside air, a heat pump that discharges a coolant as a heat medium, A cooling water circulation line capable of circulating and supplying the cooling water in the cooling tower to the floor-embedded air conditioning facility, and a heat pump air conditioning line that circulates and supplies the heat medium discharged from the heat pump as a heat source of the floor-embedded air conditioning facility Ri name with a door,
The floor of the floor-embedded air conditioning system is an air conditioner in which the cooling water is circulated and supplied without providing a heat insulating material on a floor slab formed by placing concrete on a deck plate formed with a plurality of recesses. The pipe is arranged, lightweight concrete is casted, the deck plate is removed, and the deck plate is removed to remove the sound absorbing material in the plurality of recesses formed on the lower surface of the floor slab. together they are provided, a metallic porous plate is fixed to the lower surface and the lower surface side of the floor slab, the air conditioning system characterized that you have been a skeleton ceiling without the ceiling.   A heat exchanger is interposed in the heat pump air conditioning line, and in the cooling water circulation line, the cooling water is sent to the heat exchanger for heat exchange, and then supplied to the floor-embedded air conditioning facility. The air conditioning system according to claim 1, wherein a bypass line and a second bypass line that bypasses the cooling water from the cooling tower are provided.   In the cooling water circulation line, air conditioning is performed by sending air conditioning air directly into the building using sensible heat of the cooling water flowing through the cooling water circulation line in parallel with the floor-embedded air conditioning facility. The air conditioning system according to claim 1 or 2, wherein a machine is connected.

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