JPH11311438A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance an energy consumption efficiency of an air conditioning facility, by separately treating sensible heat which can be subjected to a cooling treatment with cold water of a high temperature level and latent heat which requires cold water of a temperature level which is far lower than a dew point temperature of indoor air. SOLUTION: A cold water feed main vertical pipe 50 of a high temperature level and a cold water return main vertical pipe 51 are connected to cold water circulation system pipes 53 of a high temperature level of respective floors, which are connected with each other by way of heat exchangers 52 of respective floors. By means of cold water circulation pumps 54 of a high temperature level at respective floors, cold water of a high temperature level is circulated and supplied so that air in air conditioning rooms 47 is circulated and cooled and sensible heat is removed. In the daytime zone, a low temperature cold water circulation pump 19 of a chiller unit 1 is operated so as to supply cold water of a low temperature which is extremely close to an ice point to a main plate fin tube heat exchanger 38 of an outdoor controller 31, and a blower 40 is driven so as to supply air to ceiling spaces 48 of air conditioning rooms 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving and improving the energy-saving performance of air-conditioning equipment for medium-sized or large-scale offices or commercial buildings.

[0002]

2. Description of the Related Art In a conventional air conditioner, the outside air and indoor circulating air are mixed to perform cooling and dehumidification at once, or even when the outside air is cooled and dehumidified separately from the indoor circulating air in advance, the dew point temperature level is only that much. However, since it is not enough to remove the latent heat load in the room, the indoor circulating air has been cooled and dehumidified to a temperature lower than the dew point temperature of the room air to cope with the latent heat load.

[0003] In the system utilizing ice heat storage, even if the outside air system and the indoor system are separated, cold water of different temperature levels is not used, but cold water of the same temperature level is used.

Further, in the conventional ice heat storage chiller unit, it is necessary to increase the heat transfer area of the heat exchanger for making ice, so that the internal volume of the heat exchanger increases and the amount of refrigerant charged increases. An antifreeze is used for the heat exchanger for ice heat storage, and indirect cooling is performed through heat exchange between the refrigerant and the antifreeze.

[0005]

In recent years, office automation has been advanced, and the number of OA devices in the room has increased, and conversely, the number of occupants has tended to decrease. However, the ratio of the sensible heat load has increased, and the ratio of the latent heat load has decreased, and the sensible heat load has the overwhelming majority.

To deal with the latent heat load, the dew point temperature of the room air, that is, about 14 ° C. in a room air condition of a dry bulb temperature of 25 ° C. and a relative humidity of 50%, a temperature lower by several degrees C., ie, 1 ° C.
Since it is necessary to cool and dehumidify the air to a temperature of about 1 ° C. to 13 ° C., if considering a temperature lower than 11 ° C. to 13 ° C. and an effective temperature difference of about 6 ° C. in the heat exchanger, 5 ° C. to 7 ° C. cold water or Refrigerant is required, but for processing the sensible heat load, air with a temperature slightly lower than room temperature will basically be useful for cooling. It is 15 if we take measures such as increase
It can be sufficiently cooled with cold water or a refrigerant at a high temperature level of 10 ° C. to 17 ° C.

[0007] Nevertheless, conventional air-conditioning equipment is not designed to separately process latent heat and sensible heat.
Even in recent air-conditioning loads in which sensible heat occupied an overwhelming majority, since low-temperature cold water of 5 ° C to 7 ° C was still used, the evaporation temperature of the refrigerator could not be increased,
No improvement in energy consumption efficiency.

Further, in recent years, an ice heat storage system using electric power during the night time has been widespread to alleviate the peak of the electric power during the summertime during the summer. In addition, the evaporating temperature is naturally below the freezing point to operate the refrigerator at night to produce 0 ° C ice, and in practice, the ice is indirectly produced by using antifreeze and compared to the conventional one. The level of the evaporating temperature is also lowered at 15 ° C. to 20 ° C., and the energy consumption efficiency is further reduced.

[0009]

According to the present invention, sensible heat that can be cooled with high-temperature cold water and latent heat that requires cold water at a temperature lower than the dew point of room air are separately processed. Thus, the sensible heat load, whose ratio has increased in recent years, is treated with cold water at a high temperature level, and the evaporating temperature of a refrigerator used for circulating cooling of the cold water is raised to increase the level of air conditioning equipment. Realize increasing energy consumption efficiency. Another object of the present invention is to provide a method for solving the problem including the problem that arises.

[0010]

According to the present invention, the sensible heat load and the latent heat load can be processed separately, so that the supply of the outside air conditioner system for processing the outside air introduced for the occupants is set to a low dew point and the latent heat load is set to a low dew point. The recirculation air-conditioning system, which recirculates and cools the indoor air, is used exclusively for sensible heat treatment. Of course, there is no problem even if recirculated air is mixed into the outside air conditioner system.

In the pleasure air conditioning intended for the occupants, naturally, there is a predetermined minimum required outside air amount per occupant, but in the present invention, this amount of outside air is taken in, dehumidified and supplied to the room. The difference between the absolute humidity of the room air that is air-conditioned and the absolute humidity at the dew point temperature after dehumidification of the intake outside air, and the difference in the amount of water vapor due to the product of the amount of intake outside air, is the amount of water vapor generated by the occupants of the room. Was dehumidified to a temperature below the dew point temperature at which can be canceled.

This eliminates the need to treat latent heat at all in a recirculating air-conditioning system that recirculates and cools indoor air, so that cooling is performed in a temperature range higher than the dew point temperature of room air to reduce indoor sensible heat. By cooling and removing, the indoor temperature,
Humidity can be maintained at a predetermined value, and the use of chilled water at a high temperature level for processing the overwhelmingly large part of sensible heat load raises the evaporation temperature of the refrigerator used for this. The energy consumption efficiency of the entire air conditioner can be improved.

Further, in the present invention, in order to reheat the supply air which has been cooled and dehumidified in the outside air conditioning system, a heat exchanger is provided at an inlet and an outlet of the outside air conditioner, and water is circulated between the heat exchanger and the high temperature inlet air. Heat exchange, pre-cools the outside air, and transfers a part of the cooling load of the outside air to the indoor load. The load can be transferred to the recirculating air conditioning system.

In order to secure the reheating when the outside air temperature is not very high, in the present invention, the refrigerating machine operated for cooling and dehumidification is installed at the outlet of the outside air conditioner by using the waste heat of the cooling water of the refrigerator. The heat exchanger also allows reheating.

When the outside air temperature is low in winter and the dehumidified air cannot be reheated by the heat of the outside air

When the circulation of water is stopped by providing an open water tank at a position lower than the heat exchangers provided at the inlet and the outlet of the outside air conditioner, the water inside the heat exchanger stops. Care was taken to prevent freezing damage to the heat exchanger even when the heat exchanger was emptied by flowing down into the open water tank by gravity and the outside air temperature dropped below 0 ° C.

Further, the high-temperature cold water used for cooling the recirculation air-conditioning system with the room is further used for the third plate-fin tube heat exchanger described in claim 5 to pre-cool the high-temperature portion of the outside air. , A part of the cooling load of the outside air can be transferred to high-temperature chilled water, and at the same time, the temperature of chilled water can be further increased to contribute to improvement of energy consumption efficiency.

This pre-cooling circuit works for pre-heating the outside air in winter, and the heating load by the outside air can be canceled by using the indoor sensible heat load.

In the present invention, the temperature difference required for heat transfer between the chilled water and the air is reduced by using the main heat exchanger as a direct contact heat exchanger so that the required chilled water temperature level is kept at a little higher. At the same time, a plate fin tube heat exchanger for pre-cooling or pre-heating the outside air by using the cold water used for removing the sensible heat in the room as described in claim 5 is combined with the upstream side to divide the air into a plurality of stages to form an air flow. Can be arranged in series along the line to easily humidify the dry outside air in winter with cold water of about 20 ° C.

The present invention specializes in the cooling of sensible heat, which accounts for the majority of the air conditioning load, without the necessity of processing the latent heat load in the recirculating air conditioning system with the room, and adjusts the chilled water temperature level of the cooling system. In order to raise the level of the evaporating temperature of the refrigerator used there and raise the energy consumption efficiency, to take in the outside air to a low dew point where the whole latent heat load in the room can be canceled, to cool and dehumidify the outside air Then, cold water having a temperature very close to the freezing point at which the ice obtained by ice heat storage was melted was used.

In the present invention, in order to suppress the rate at which the energy consumption efficiency decreases due to the decrease in the evaporating temperature of the refrigerator during the ice heat storage operation, the use of the antifreeze which has been conventionally used is stopped and the ice for freezing is formed. In order to reduce the number of heat transfer steps by one and to increase the internal volume of the heat exchanger of the refrigerant caused by taking a large heat transfer area to make ice efficiently, and to maintain a good balance with the compressor. An extremely large number of capillary tubes are used in parallel as heat transfer tubes of an evaporator, and the structure is improved so that a larger heat transfer area can be obtained with a smaller internal volume than a conventional evaporator.

Further, in the present invention, in order to prevent deterioration in quality due to refrigerant piping at the site where installation quality control is difficult in practice, all parts constituting the refrigerant circuit are assembled on a common frame to enable factory production. Ice storage chillers were used.

The chiller used in the present invention is operated at an evaporating temperature at a higher temperature level than usual during the air-conditioning use time period. Therefore, when the outside air temperature is high, the air-cooled condenser may overload the compressor. In order to prevent this, in the present invention, the condenser of the air-cooled chiller is sprinkled with water to suppress the condensation temperature by the latent heat of evaporation.

The chiller used in the air conditioner of the present invention performs an ice heat storage operation in the air conditioning non-use time zone, that is, in the night time zone, and performs the refrigerant storage operation in the air conditioning usage time zone, in the daytime zone. The circuit is switched by a valve operation to circulate chilled water with a high temperature level used for sensible heat cooling in the recirculating air conditioning system with the room using an air conditioning evaporator provided separately from the evaporator for ice heat storage operation Cooling.

Thus, in the daytime operation, not only can the evaporating temperature be greatly increased than in the nighttime ice heat storage operation time period, but it is extremely close to the freezing point obtained by melting the ice formed by ice heat storage. By mixing near low-temperature chilled water at the high temperature level of chilled water in the fan coil unit or the outgoing pipe to the air conditioner, it is possible to further raise the evaporation temperature of the refrigerant in the evaporator, thereby improving the energy consumption efficiency of the refrigerator. It can be greatly improved.

In the present invention, the condenser of the refrigeration cycle is sprinkled with water to use the latent heat of evaporation to suppress the level of the condensation temperature, but separately from this condenser, the second condenser is connected in series or in parallel. A vessel is provided as needed so that hot water can be supplied to the system that requires partial heating at the same time as cooling in the middle and winter seasons.

In the present invention, a closed cooling tower is connected to the high temperature level chilled water circuit so as to be switchable in parallel or in series or in series / parallel with an evaporator of a refrigerator, and a return pipe from a recirculating air-conditioning system to a room is connected. When cooling water at a temperature equal to or lower than the cold water temperature of the closed cooling tower is obtained by operating the closed cooling tower,
The operation of the refrigerator was reduced or stopped to save energy.

According to the present invention, the piping of high-temperature cold water to be supplied to the recirculation air-conditioning system with the room is passed through the ceiling of the room to be air-conditioned. After introducing the supplied air into the chamber as a chamber, the air is sucked from a fan coil unit or the like and supplied to the room, so that the interior of the ceiling air is filled with air having a low dew point, and the cold water is supplied. Since there is no risk of dew condensation on the piping, there is no need for heat insulation and dew prevention.

When the air conditioner according to the present invention is applied to a multi-storey building and a common heat source device is used for each floor,
A high-temperature chilled water circulation system pipe used for the recirculation air-conditioning system with the room is connected indirectly through a heat exchanger through a horizontal pipe on each floor and a rising main pipe vertically penetrating each floor and connected to a heat source device. It is also possible to prevent the pressure inside the riser tube from being applied to the sideways tube.

According to the present invention, an open water tank is provided for each of the piping paths of the chilled water circulation system having a high temperature level on each floor which is pressure independent as described above, and the open water tank is connected to the suction pipe of the circulation pump by switching a valve. The pressure inside the cold water circulation system piping is higher than the atmospheric pressure while the open water tank is connected to the suction pipe of the circulation pump, During the connection, the pressure inside the pipe of the cold water circulation system can be kept lower than the atmospheric pressure.

The ceiling-mounted fan coil unit used in the air conditioner according to the present invention is a plate fin tube which is in contact with the lower side of a radiation type rotary impeller having an open lower surface perpendicular to the axis and which is also open to the lower surface and has no drain pan. Place the heat exchanger, provide a non-woven filter and suction port along its lower surface and expose it to the ceiling surface, surround the upper surface and the periphery of the radiation type rotary impeller with a diffuser plate, and around the suction port Also, the main structure is such that it is connected to the air outlet that is also exposed on the ceiling surface.

According to this structure, air is sucked from the central ceiling surface of the fan coil unit, filtered by a filter, cooled by a plate fin tube heat exchanger, pressurized by a radiant fan, and blown from the surrounding ceiling surface. The flow path of the air reaching the outlet is extremely short, and the air can be circulated very efficiently with little bending.

In the fan coil unit used in the air conditioner of the present invention, a plurality of holes are formed near the center of the rotating disk of the radiating type impeller, and the radiating type rotor is further provided on the casing plate above. When an opening is provided in the center of the car and the radiant impeller rotates, as the air between the wings of the radiant impeller moves to the outer periphery by centrifugal force, it is opened near the center of the rotating disk. From the opening of the upper casing through the plurality of holes, from the ceiling wall where the fan coil unit is installed, sucks in the outside air supplied from the outside air conditioner via the air supply duct, On the average, between the circulating air from the room, which is cooled and sucked by the plate fin tube heat exchanger through the air suction port and filter from the lower ceiling surface, Mix from outside Ifuyuza, to supply air into the room through the air outlet.

The filter attached to the fan coil unit used in the air conditioner of the present invention is in contact with the lower surface of the plate fin tube heat exchanger having a square or rectangular planar shape, and is substantially the same as the plate fin tube heat exchanger. It is assumed that the filter media made of non-woven fabric is disposed, but when both ends in the length direction are wound around a roll and both rolls are rotated clockwise and counterclockwise in the same direction, the filter media reduces the length between both rolls. Attached so as to reciprocate, a slit type or multi-hole type vacuum dust removal tube is provided along one roll so that the slits or hole rows are pressed against the air suction surface of the filter media, and vacuum is applied while rotating the roll. Driving the central vacuum cleaner connected to the dust removal tube removes dust adhering to the filter media. , The filter media is automatically reverse washing, it was to be played.

【Example】

Next, an embodiment of an air conditioner according to the present invention will be described with reference to the drawings.

FIG. 1 shows a system diagram of an air conditioner according to the present invention.
In the figure, reference numeral 1 denotes a chiller unit, and a compressor 2 constituting a refrigeration cycle, a four-way valve 3 for switching a flow direction of a refrigerant, an air-cooled condenser 4, an operation of an air-cooled condenser 4 and valves 5, 6, 7, and 8. A second condenser 9 for hot water, a throttle valve 10, an evaporator 11 for ice storage, and an evaporator 11 for ice storage configured by connecting an extremely large number of capillary tubes in parallel, which can be switched or used in parallel. An air conditioner use time zone evaporator 14, a refrigerant connection pipe 15, etc., which are connected in parallel by the switching valves 12, 13, and a water connection device 17 for spraying water to the ice heat storage water tank 16, the air-cooled condenser;
Condenser blower 18, low-temperature chilled water circulation pump 19, low-temperature chilled water outgoing pipe 20, low-temperature chilled water return pipe 21, high-temperature chilled water circulation pump 22, high-temperature level chilled water outgoing pipe 23, high-temperature level chilled water return pipe 24, Automatic mixing valve 25 for high-temperature cold water and low-temperature cold water, sensor 26 for high-temperature cold-water temperature, hot water circulation pump 27, casing 28
These are all integrated on one common base 29 to form a unit, and are installed on the rooftop 30 of the building.

In the figure, reference numeral 31 denotes an outside air conditioner,
2, an outside air filter 33, a first plate fin tube heat exchanger 34, a second plate fin tube heat exchanger 35, a third plate fin tube heat exchanger 36,
Fourth plate fin tube heat exchanger 37, main plate fin tube heat exchanger 38, humidifier 39, blower 4
0, drain pan 41, water circulation pipe 42 for connecting the first plate fin tube heat exchanger and the second plate fin tube heat exchanger, water circulation pump 43, open water tank 4
4. It is composed of an outside air conditioner casing 45 and the like, and is installed on the rooftop 30 of the building.

In the figure, reference numeral 46 denotes an outside air supply duct, which falls from the outside air conditioner 31 on the rooftop 30 to each floor below, branches off to each floor, and provides airtightness by using the ceiling of a room 47 for air conditioning on each floor as a chamber. Reaching the ceiling space 48, the outside air from the outside air conditioner 31 is cooled and dehumidified to a low dew point of 7 ° C., and the outside air whose reheat is adjusted to a temperature of about 25 ° C. which is almost room temperature is blown out.

In the figure, reference numeral 49 denotes a fan coil unit dedicated to sensible heat cooling, 54 units are installed on the ceiling surface of a room 47 for air conditioning, the chiller unit 1 has a cold water outgoing pipe 23 having a high temperature level of 16 ° C., and a high temperature level. A high temperature level cold water main pipe 50 connected to a 21 ° C. cold water return pipe 24,
Cold water return vertical pipe 51 with high temperature level, heat exchanger 5 on each floor
2 is connected to a chilled water circulating system piping 53 having a high temperature level, a forward temperature of 17 ° C., and a return temperature of 22 ° C. of each floor connected to each other via the chilled water circulating pump 54 at a high temperature level. The air in the room 47 to be circulated and air-conditioned is circulated and cooled to remove sensible heat, and at the same time, the outside air supplied to the ceiling space 48 through the outside air supply duct 46 is adjusted by the outside air conditioner 31. Suck and supply to the room.

An open water tank 55 is provided on each floor in association with the high temperature level cold water circulation system piping 53 on each floor, and valves 56 are provided on the suction side and discharge side of each high temperature level cold water circulation pump, respectively. At 57, it is possible to switch to either one and connect.

In the air conditioner according to the present invention, the chiller unit 1 performs the ice heat storage operation during the non-air-conditioning time period, that is, the night time period of 14 hours from 18:00 to 8:00 on the following day, and stores the ice in the ice storage water tank 16. Make and store. In this case, the switching valves 12 and 13 are operated so that the refrigerant passes through the ice storage evaporator 11 of the chiller unit 1, and the compressor 2 is operated with the four-way valve in the cooling position to operate the air-cooled condenser. Watering device 1 for 4
7 is sprayed, water is radiated and cooled by the condenser blower 18, heat is taken from the water in the ice heat storage water tank 16 through the ice heat storage evaporator 11, and the water spray device 17 is discharged.
And water is radiated from the air-cooled condenser 8 whose temperature is kept low by the latent heat of evaporation.

In the present embodiment, a capillary tube constituting an evaporator for ice heat storage is a copper tube formed by bending a straight tube of 1.5 mm in inner diameter and 2.1 mm in outer diameter and 4960 mm to 180 ° to 5R at the center at a central portion to form a hairpin shape. At a depth of 2650 mm,
Vertically, vertically and horizontally, with the bent part down, inside the FRP ice heat storage water tank 16 having a width of 1200 mm and a length of 1250 mm.
7500 pcs with a pitch of 9 mm at both ends
m, 60 mm refrigerant outlet header having a length of 1200 mm, which is also connected to the 60 refrigerant inlet headers, has a total heat transfer area of 245 m ^2, but has a volume of less than 126 liters, and is filled with water up to 2400 mm in the ice heat storage water tank 16. Remains at only 3.5% of the available volume containing 3600 liters.
In addition, the volume of the evaporator is 70 liters, which is appropriate in view of the limit of the amount of refrigerant held inside the refrigeration cycle by the compressor, and makes it possible to directly cool the water in the ice storage water tank with the refrigerant.

If a heat transfer tube having a diameter of 16 mm is used like a heat exchanger of a commercially available ice heat storage tank, a total length of 4880 m is required to obtain the same heat transfer area of 245 m ² , Reaches 980 liters, resulting in a reduction in the volume of the ice heat storage water tank by 27% or more. Further, the internal volume becomes 750 liters, and the amount of the refrigerant due to the structure of the compressor 2 is required for direct cooling with the refrigerant. It far exceeds the upper limit and is not suitable at all.

The heat transfer area of 245 m ² is the evaporation temperature−
Cooling capacity 2 incorporated in chiller unit 1 at 0.5 ° C
By operating the compressor 2 of 6 kw and input of 6 kw, icing can occur on the outer surface of the ice evaporator 11 made of a capillary tube. As the operation time elapses, the thickness of the icing increases, and cylindrical ice develops on the outer periphery of the capillary tube having an outer diameter of 2.1 mm. However, since the interval between the capillary tubes is 10 mm, the thickness of the ice is increased. When the length is less than 4 mm, neighboring ice cylinders are in contact.

When the operation of the compressor 2 is further continued,
The ice cylinders touch each other, filling the gaps in the next stage. The volume of ice is 9 times the volume of the ice storage water tank.
Even at 5%, the ice thickness is only 4.5mm at the portion facing the remaining gap. At this time, the volume of the ice was 3410 liters, and the amount of heat stored by the latent heat of the ice was 2 liters.
A total of 357 kWh of heat is stored by adding 90 kWh of heat stored by sensible heat of the water, which becomes effective when the temperature of the water in the ice heat storage water tank 16 rises to 17 ° C. when used in the air conditioning time zone, and this is cooling. One of the 26 kW compressors 1
This corresponds to a cooling capacity of 3.7 hours of operation, which is in good agreement with 14 hours in the night time zone.

Since the thermal conductivity of ice is very low compared to 85 of steel and 400 of copper, and is only 2.2, the thickness of ice at the time of completion of ice storage increases the performance of the evaporator for ice storage. Depends. Therefore, the heat transfer coefficient inside and outside the tube, including ice, shows different values before the start of icing and at the completion of heat storage, and at a thickness of 4.5 mm of ice, it is reduced by 28% as compared to before the start, and the conventional heat transfer rate is smaller. As in the case of using antifreeze, for example, the thickness of ice of 40 mm is reduced by as much as 80%, the temperature difference between ice and the refrigerant is 0.5 ° C. at the beginning of icing, and when ice storage is completed. The former requires 0.7 ° C., and the latter requires five times 2.5 ° C.

Conventionally, in the case of a commercialized ice storage chiller using an antifreeze, heat is transferred by a change in the temperature of the antifreeze itself, so that a temperature difference occurs between an inlet portion and an outlet portion of the heat transfer tube. The temperature difference further adds to the difference between the evaporation temperature of the refrigerant in the evaporator and the temperature of the antifreeze, and the evaporation temperature is 10 times lower than that of the chiller unit that directly uses the refrigerant to make ice using the air conditioner of the present invention. ° C ~
Not only did the temperature drop by as much as 15 ° C., but there was also a drawback that the temperature difference between the inlet and outlet of the antifreeze caused uneven icing on the heat transfer tube surface.

When the ice heat storage operation is completed, the air conditioning use time zone,
That is, in the daytime, the low-temperature chilled water circulation pump 19 of the chiller unit 1 is operated to circulate and supply low-temperature chilled water having a temperature very close to the freezing point to the main plate fin tube heat exchanger 38 of the outside air conditioner 31. In the outside air conditioner 31, the blower 40 is operated, and the outside air filter 33, the first and third rate fin tube heat exchangers from the air inlet 32,
34, 36, main plate fin tube heat exchanger 38,
The outside air supply duct 4 passes through the fourth plate fin tube heat exchanger 37 and the second plate fin tube heat exchanger 35 in order and sucks and pressurizes the outside air whose temperature has been adjusted.
After 6, the air is supplied to the ceiling space 48 of the room 47 to be air-conditioned. The outside air conditioner of this embodiment has an air volume of 1250 m ^3.
/ H, the passage area of each heat exchanger is 0.3 m ² , height 50
0 mm and 600 mm in width.

In the summer, the water circulation pump 43 is operated to draw water from the open water tank 44, pass through the first plate fin tube heat exchanger 34, pass through the water circulation pipe 42, and pass through the second plate fin tube heat exchanger. Return to the open water tank 44 through 35 and recirculate. By this water circulation, when the outside air having a dry bulb temperature of 32 ° C. and a relative humidity of 70% passes through the first plate-fin tube heat exchanger, the second plate-fin tube heat exchanger 35 has a low dew point of 7 ° C. It exchanges heat with air and exchanges heat with circulating water whose temperature has dropped to 17 ° C., loses 7.5 kW of heat, cools and dehumidifies it to a saturation point of 23 ° C., and conversely raises the temperature of circulating water to 29 ° C.

In exchange for this, in the second plate fin tube heat exchanger 35, the main plate fin tube heat exchanger 38 is fed from the ice storage water tank 16 of the chiller unit by the low temperature chilled water circulation pump 19 via the low temperature chilled water outgoing pipe 20. The low-temperature air cooled and dehumidified to 7 ° C. by exchanging heat with low-temperature cold water very close to the freezing point, and heated to 29 ° C. by the first plate-fin tube heat exchanger 34 and supplied through the water circulation pipe 42. Heat exchange with water and outlet air is 25 ℃
And the circulating water at 29 ° C. is cooled to 17 ° C. This second plate fin tube heat exchanger 35
Is the same as the amount of heat exchanged in the first plate-fin tube heat exchanger.

When the water circulation pump 43 is stopped in a season in which the outside air temperature is low and it is not useful to reheat the cooling dehumidified air having a low dew point of 7 ° C., the circulating water is supplied to an open water tank provided at the bottom of the water circulation system. And the first plate-fin tube heat exchanger 34 and the second plate-fin tube heat exchanger become empty.

Third plate fin tube heat exchanger 3
In FIG. 6, the heat obtained by cooling and removing the sensible heat generated in the room by the circulating air conditioning system with the room is received by the heat exchangers 52 on the respective floors, and the temperature rises to 21 ° C. Return cold water at a temperature level of 180 lit / min is passed through the first plate-fin tube heat exchanger 34 to exchange heat with the outside air that has become saturated air at 23 ° C. and 22 ° C.
1.5 kW of cooling and dehumidification up to the saturation point of

The amount of heat exchange in the third plate-fin tube heat exchanger 36 is small in summer, but in winter, when the outside air temperature is 0 ° C., the heat of the return chilled water having a high temperature level of 21 ° C. Received 6.7 kW of heat and 16
If the temperature rises up to ℃, the adiabatic humidifier 39 adiabatically humidifies the air and supplies it to the room as saturated air at 6 ° C. Instead, it accounts for about 11% of indoor sensible heat removal.

Fourth plate fin tube heat exchanger 3
7, the outside air temperature is not very high, and the reheating by the first and second plate fin tube heat exchangers 34 and 35 is insufficient, so that the reheating temperature of the outside air having a low dew point of 7 ° C. does not reach 25 ° C. In this case, the second condenser 9 of the chiller unit 1 is connected to the valve 5,
6, 7, and 8 are appropriately operated and switched, and the air-cooled condenser 4
Through which hot water of 35 ° C. is circulated and supplied by a hot water circulating pump 27 to 7.5 ° C. up to 25 ° C.
It has the ability to reheat kw.

The hot water from the second condenser 9 is used in winter when there is an air conditioning system that requires heating in part.
By switching the valves so that the same hot water can be supplied to the air conditioning system, even when most of the building is being cooled, the air conditioning system can be supplied with hot water for heating.

In the main plate fin tube heat exchanger 38, the temperature is 22 ° C. in the third plate fin tube heat exchanger 36.
Is exchanged between the outside air pre-cooled to the saturation point and low-temperature cold water close to the freezing point sent from the ice heat storage water tank 16 through the low-temperature cold water circulation pipe 19 by the low-temperature cold water circulation pump 19 by 17.4 kW. Is cooled and dehumidified to a dew point of 7 ° C.

The main plate fin tube heat exchanger 38 may use another type of heat exchanger, for example, a direct contact heat exchanger such as a filler molded from a plurality of thin resin sheets. Further, by combining the third plate fin tube heat exchanger 36 with the direct contact heat exchanger,
It may be divided into a plurality of stages and used in series, and further, by combining the third plate fin tube heat exchanger 36 and the main plate fin tube heat exchanger 38,
It may be divided into a plurality of stages and used in series with an adiabatic humidifier such as an evaporative humidifier or an ultrasonic humidifier interposed at each stage.

The above-mentioned cooling to a low-temperature dew point of 7 ° C. is economically feasible only with low-temperature cold water close to the freezing point due to ice storage, and cannot be realized with conventional cold water of 5 ° C. to 7 ° C. for economic reasons. .

The amount of water vapor contained in the low-temperature dew point air at 7 ° C. is 6.2 g / kg / kg of dry air in humid air.
The condition of the indoor air in the room 47 to be air-conditioned is
Assuming that the relative humidity is 5 ° C. and the relative humidity is 50%, the amount of water vapor contained in the indoor air is also 10 g / kg per 1 kg of dry air, so that air having a dew point of 7 ° C. is 10 g / kg−6.2.
g / kg = 3.8 g / kg The amount of water vapor contained is small.

If air having a dew point of 7 ° C., which is 3.8 g / kg less than the content of water vapor, is supplied to the room at 1250 m ³ / h, 3.8 g / kg × 1250 m ² /h×1.2 kg / m ³
(Density of air) = The load of water vapor generated in a room of 5700 g / h can be canceled. Since the normal amount of water vapor generated per occupant is about 100 g / h,
The water vapor load of 5700 g corresponds to 57 occupants, and the outside air intake amount 25 that is conventionally used for one occupant.
Just when dividing the fresh air intake amount 1250 m 3 / ^h of this embodiment in m 3 ^{/ h,} since it corresponds to the occupants 50 persons, in a state with a margin of about 14% to dehumidification capacity, wasted outside air Without increasing the intake amount, the latent heat load in the room is left to the 100% outside air conditioner system, and only the sensible heat needs to be removed in the recirculating air conditioning system with the room.

In this manner, in the recirculating air conditioning system with the room, only the cooling of the sensible heat is performed, and the latent heat load is not taken over. Therefore, it is necessary to lower the cooling air to the dew point temperature of the room air. No, 6 ° C above room temperature to give an example
Just cooling down to a low temperature of about 19 ° C
In order to perform this cooling, cold water at a temperature level higher than the dew point temperature, for example,
C., cold water at a high temperature level such as 22.degree. C. at the outlet.

In this embodiment, the air-conditioning use time period is from 8:00 to 18
During the daytime period of 10 hours, the compressor operates in the same manner as the night time zone, but unlike the night time zone, the switching valve 1
The refrigerant circuit is switched by using the air conditioners 2 and 13, and the evaporator 14 for the air conditioning use time zone is used.
Is operated, and the chilled water of the high temperature level of 22 ° C. sent from the fan coil unit of the recirculation air-conditioning system to the room through the chilled water circulation system piping 53 of each floor by the chilled water circulation pump 54 of each floor is supplied to each floor. Out of 180 liters / min of high temperature level recirculated water heated to 21 ° C. as a result of cooling to 17 ° C. by heat exchange in heat exchanger 52,
lit / min is returned to the ice heat storage water tank 16, and the remaining 160
lit / min is cooled down to 18 ° C., and low-temperature cold water very close to the freezing point from the ice heat storage water tank 16 is mixed by the automatic mixing valve 25, and the low-temperature water is cooled to 16 ° C. by the signal of the high-temperature cold water temperature sensor 26. ° C and a high temperature level cold water circulation pump 2 inside the chiller unit 1 via a high temperature level cold water outflow main vertical pipe 50 and a return main vertical pipe 51.
Circulate through 2.

As described above, the compressor 2 of the chiller unit 1 has an evaporation temperature of -0.5 ° C at the beginning of the heat storage operation and -0.7 ° C at the completion of ice heat storage for 14 hours in the night time zone. The average evaporating temperature is operated at −0.6 ° C., and the operation is performed at an evaporating temperature of 15 ° C. for 10 hours in the daytime. On the other hand, with respect to the condensation temperature, water is applied to the air-cooled condenser 4 by using a watering device 17.
Since the condensation temperature is kept low by the latent heat of vaporization of water, the average during the daytime is about 37 ° C and the average during the nighttime is about 35 ° C. As a result, it is unlikely that the compressor 2 will operate at a high evaporation temperature. At the same time as avoiding overload operation, the cooling capacity is improved, and the cooling capacity during the daytime is 44 kw,
The same input is 6.5kw, 440kw each for 10 hours
h, 65 kwh, while the cooling capacity in the night time zone is 26 kw, the input is 6.1 kw, and in the 14 hours, 364 kwh and 85.4 kwh, respectively. 150.4
kWh of power consumption results, and the energy consumption efficiency reaches 5.4.

The electric power of the condenser blower 18 is set to 0.1
kw, the total power of the high temperature level chilled water circulating pumps 19 and 54 is 0.9 kW, the power of the low temperature chilled water circulating pump 22 is 0.1 kW, the power of the blower 40 is 0.4 kW, and 0.54 kW for 54 fan coil units. Also, the total energy consumption efficiency taking into account the daily power consumption of 21.8 kwh, which is obtained by multiplying the respective operation times, is also a value larger than 4.5.

In the drawing, reference numeral 58 designates a series or parallel connection with the evaporator 14 for the air-conditioning use time zone, or 2 so that each can be used alone.
A closed cooling tower with a standard cooling capacity of 45 kW connected with a high-temperature chilled water pipe via the three-way switching valves 59 and 60, the outside air temperature is low, and the outlet temperature of the closed cooling tower 58 is high. When the temperature is lower than the return temperature of the chilled water, the load on the evaporator 14 for the air-conditioning time zone is reduced by passing water and operating the chilled water, thereby reducing the power consumption of the compressor 2. In the closed cooling tower, the air-cooled condenser may be replaced with a water-cooled condenser and used in combination with the water-cooled condenser as a radiator of a chiller compressor refrigeration cycle.

As the outside air temperature further decreases, the closed cooling tower 5
When the outlet temperature of 8 becomes lower than the outgoing temperature of the chilled water of the high temperature level, the switching valves 59 and 60 are operated and switched, and the cooling is performed only by the closed cooling tower 58 without using the evaporator 14 for the air conditioning time zone. Becomes possible. If the cold water outgoing temperature of the high temperature level is 17 ° C., taking the Kanto region as an example, the closed cooling tower 58 is used for a half year from November, when the average open-air wet-bulb temperature is lower than 12 ° C., to April of the following year. It is possible to cool only with this large closed cooling tower from October to May of the following year if a large closed cooling tower is used.

When the outside air temperature is high and the outlet temperature of the closed type cooling tower is higher than the high temperature level chilled water return temperature, the switching valves 59 and 60 are operated and switched to pass water through the closed type cooling tower 58. Instead, the air conditioner use time evaporator 14 is used exclusively.

[0066]

FIG. 2 is a detailed explanatory view of a fan coil unit 49 mainly used in the air conditioner according to the present invention, and 61 in the figure.
Are made of resin together with the rotating disk 62 with 36 blades of 180 mm × 60 mm and 2 mm thick, which are radially attached to the rotating disk 62 having a diameter of 500 mm. In the figure, reference numeral 64 denotes a plate fin tube heat exchanger having a plane dimension of 600 mm × 500 mm and a height of 40 mm. Is directly connected. In this embodiment, the cooling capacity of the fan coil unit is 1.2 kw, and the air volume is 10 m ³ / m.
in, the power consumption of the blower is 10 watts.

In the drawing, reference numeral 66 denotes a filter medium having a width of about 600 mm, which is almost the same as the plate fin tube heat exchanger 64 installed below and adjacent to the plate fin tube heat exchanger 64.
4 is a driving roll 68 having a diameter of 30 mm and being capable of normal and reverse rotation by a driving motor 67 installed in parallel at both ends.
And filter media 66 with roll spring 69
While applying tension to the filter media 66 to keep the filter media 66 flat, the filter media 66 is brought into contact with the lower surface of the plate-fin tube heat exchanger 65 by the forward and reverse rotation of the driving roll 68 so as to be parallel over the entire length of 500 mm. It is wound around a take-up roll 70 also having a diameter of 30 mm which can be moved. Further, below the filter media 66, an air inlet 71 that opens to the room 47 for air conditioning is connected along the ceiling surface.

In the drawing, reference numeral 72 denotes a radiation-type rotary impeller 63, and the surroundings are molded as a diffuser 73, and the air supplied from the periphery of the radiation-type rotary impeller 63 is air-conditioned on the surrounding ceiling surface. The upper casing has a 100 mm diameter opening 76 with an insect net 75 at the center and opens to the ceiling space 48.

In the vicinity of the center of the rotating disk 62 of the radiation impeller 63, there are 36 impeller inlets 77 having a diameter of 10 mm, which are located in the gap between the 36 blades 61. 63
Rotates, the air cooled by the high temperature level cold water in the plate fin tube heat exchanger 64 via the air suction port 71 and the filter media 66 from the lower air conditioning room 47 to the radiation type rotary impeller 63 At the same time, the opening 76 having a diameter of 100 mm at the center of the upper casing 72 is formed from the ceiling space 48 through the 36 openings 10 near the center of the radiating rotary impeller 64.
Similarly, through the impeller inlet 77 mm, the radiation type rotary impeller 6
4 is sucked into the gap between the wings 62 of the air conditioner 4, and both airs are pressurized by centrifugal force while being mixed on average, and are passed through a diffuser 73 and an air outlet 74 around the air.
Blow out to

During the operation of the fan coil unit 49, the filter media 66 filters the air sucked from the room 47 for air conditioning, and the dust in the air adheres to the filter media 66. The adhering dust causes the filter media 66
In order to regenerate so that clogging does not occur, the filter roll 66 and the filter media 66 are opposed to each other with the filter media 66 facing the filter media 66 and the multi-hole rows or slits are in contact with each other. A dust removal tube 78 is provided, and the other end is passed through a motor-operated valve 79 to a central vacuum dust removal device 80.
To the pipe.

By the forward and reverse rotation of the driving roll 68, the central type vacuum dust removing device 80 is operated while the filter medium 66 is reciprocated in parallel over the entire length of 500 mm of the plate fin tube heat exchanger 64, and the electric valve 79 is operated. Is released, dust adhering to the filter media 66 is sucked, backwashed, and the filter media 66 is regenerated.

In the air conditioner according to the present invention, since the fan coil unit 49 is supplied with air having a low dew point from the outside air conditioner 31 through the ceiling space 48, it is not necessary to remove the indoor latent heat load. It does not include a drain pan because it uses chilled water with a temperature level higher than the dew point of indoor air to cool and remove sensible heat.

However, it is possible to prevent a sudden increase in the number of occupants in the room and an increase in the amount of water vapor in the room air, thereby preventing dew condensation on the plate fin tube heat exchanger 64 and causing a water leakage accident. It is desirable. For this reason, a sensor 82 of an electronic circuit 81 for detecting moisture is attached to a suitable portion of the plate fin tube heat exchanger 64, and an inlet pipe 83 of a high temperature level cold water is supplied by a signal of the electronic circuit 81.
The electromagnetic valve 84 provided at the portion is closed to stop the flow of the high-temperature cold water so that no more dew condensation occurs. In another embodiment, the rotation speed of the fan is increased by the signal of the electronic circuit 81, the air volume is increased, and the difference between the inlet air temperature and the outlet air temperature is reduced so that dew condensation does not occur. This sensing of moisture may be replaced by sensing the relative humidity of the outlet air.

[0074]

Since the present invention is constructed as described above, many effects can be obtained as follows. First, in air-conditioning of office buildings and the like where the ratio of sensible heat load has increased due to the recent OA, the supply air dew point temperature of the system of intake outside air is sufficiently lowered to about 7 ° C., and thereby the indoor latent heat load is reduced. 100%, the indoor sensible heat load can be cooled by a temperature level higher than conventional by 10 ° C. or more, that is, by cold water at an outgoing temperature of about 16 ° C. The evaporating temperature of the refrigeration cycle can be raised significantly, and the energy consumption efficiency has improved almost twice.

In the present invention, a large closed cooling tower can be used in conjunction with an evaporator of a chiller in a chilled water circulation system of a high temperature level in these intelligent buildings requiring cooling even in the middle period to winter. After connecting,
During the period of more than half a year from October to May of the following year, the refrigerator can be cooled by the outside air without operating the refrigerator during the air-conditioning use time, and the annual energy consumption efficiency can be greatly increased.

In the present invention, unlike the conventional cooling method, low-temperature chilled water by ice storage is used in order to sufficiently lower the supply air dew point temperature of the intake external air system. The heat storage chiller uses antifreeze to make ice, so the evaporation temperature during ice making is low, and the energy consumption efficiency is low. Thus, ice can be directly made with refrigerant gas, thereby improving the energy consumption efficiency during ice making by a factor of two.

The invention of the evaporator using the capillary tube not only reduces the pitch of the heat transfer tubes to reduce the thickness of icing and improves the heat transfer coefficient, but also increases the ice storage efficiency in the ice storage water tank by nearly 30%. Improved, eliminates the need for antifreeze equipment, reduces the size and weight of the entire chiller unit, integrates it on one common mount, makes the chiller unit factory-produced, and eliminates the difficulties of quality control by on-site assembly I was able to do it.

In the chiller unit of the present invention, the compressor is operated at an evaporating temperature higher than the conventional one by 10 ° C. or more in order to improve the energy consumption efficiency. Overload. To prevent this, a water sprinkler was attached to the air-cooled condenser, and the condensation temperature was kept low by utilizing the latent heat of evaporation of water sprinkling. This has the effect of lowering the condensing temperature by 5 ° C. or more than the condensing temperature of the water-cooled condenser, and is simpler and cheaper than the water-cooled condenser, and greatly contributes to the improvement in energy saving of the refrigeration cycle.

In the present invention, the characteristic is exhibited by lowering the dew point temperature of the outside air supply to 7 ° C. However, if this outside air is supplied to the room at a low temperature, a water leakage accident due to dew condensation in a duct or the like in the middle may occur. In order to prevent the possibility of affecting the temperature distribution, the load is shifted to cold water having a high temperature level and high energy consumption efficiency to improve the energy consumption efficiency of the entire apparatus. Therefore, the outside air having a low dew point of 7 ° C. is reheated to near room temperature of 25 ° C.

For this purpose, in the present invention, a water-cooled second condenser is provided in addition to the air-cooled condenser, and the waste heat is used as the heat source for the reheating, and the outside air is reheated. As a result, the condensing temperature of the compressor was lowered, and the energy consumption efficiency was improved on both sides. In addition, the second water-cooled condenser has a cooling load in most of its buildings,
If heating is required in a part of the system, hot water can be supplied to the system.

In the present invention, since the sensible heat of the room is cooled using cold water at a temperature level higher than the conventional one by 10 ° C. or more, the air-conditioning air volume almost twice as much as the conventional one is required. The coil unit uses a radiant fan that adopts a radiant type impeller in a direction perpendicular to the axis, and turns extremely inside the unit in a skillful combination with a heat exchanger that eliminates the need for a drain pan by the air conditioning system of the present invention A low-speed airflow structure with a small number of airflows was formed, the pressure loss of air was reduced, and the mechanical efficiency of blowing was improved to nearly three times.

As a result, even if the air-conditioning air volume is nearly doubled, the blowing power can be reduced on the contrary, and the air-conditioning air volume is further increased, so that the air volume distribution and temperature distribution in the room are improved. Comfortability has been improved compared to conventional air conditioning systems. In particular, it was possible to significantly reduce the lowering of the volume of air blown out by the conventional ice storage type air conditioning and the reduction in the livability due to the small amount, while using ice storage.

The fan coil unit according to the present invention uses a radiating fan as described above. However, a hole is formed near the center of the rotating disk, and an opening is formed in the upper casing at substantially the same position. The air in the ceiling can be sucked in without any bending from the installed ceiling, and the recirculated air from the room can be mixed with the radiant impeller in average, so that the mechanical efficiency of the outside air flow is improved. Improved, the distribution of outside air is improved, and the ceiling is made to function as an outside air chamber, so the ceiling is filled with low dew point air, and cold water is supplied to the fan coil unit etc. in this space For high-temperature cold water pipes and the like, it is not necessary to keep the pipes warm and dew-proof, and it was possible to reduce equipment costs.

In the air conditioning system according to the present invention, it is economically necessary to use the fan coil unit having a high mechanical efficiency of the above-mentioned air blow, but the present invention is disadvantageous in the conventional fan coil unit system. The problem of the possibility of water leakage from the water pipe and the maintenance and replacement of the filter were solved.

That is, in the case of the water pipe, the drain pipe is unnecessary in the air conditioning system according to the present invention because of the characteristics of the system, so that the drain pipe is eliminated, and the cold water circulation pipe is separated from the pressure relationship with the heat source device on the upper floor. A heat exchanger is installed on each floor, each floor is an independent circulation circuit, and an open water tank is provided here so that it can be switched and connected to either the suction side or the discharge side of the circulation pump. By connecting the water tank to the suction side of the circulation pump, filling the piping system with water, bleeding air, and then switching to the discharge side, it is possible to circulate cold water while maintaining the inside of the water circulation piping system at a pressure lower than atmospheric pressure. In addition, water leakage accidents from pipes can be completely prevented.

The fan coil unit according to the present invention is provided with a roll drive type automatic regeneration type filter medium in contact with the suction port, and a number of units are connected to the pipes of a series of central vacuum cleaners via electric valves. However, since the regeneration operation was enabled one by one, there was no need to replace the filter, and the maintenance became fully automatic.

The outside air conditioner according to the present invention is provided with first and second plate fin tube heat exchangers for reheating the outside air dehumidified to a low dew point by the heat of the outside air and cooling the outside air in summer. By operating the water circulation pump and circulating water between both heat exchangers to exchange heat, the external air load was reduced from the conventional level, and a part of the external air load was transferred to cold water with a high temperature level to save energy. Consumption efficiency could be improved.

If the pump is stopped during the period when the outside air temperature is low and the dehumidifying air with a low dew point is not effective in the above apparatus, the circulating water flows down naturally into the open water tank installed below, and the inside of the heat exchanger is discharged. It becomes empty and can prevent the heat exchanger from freezing accidents in winter due to low temperature outside air.

In the present invention, by installing the third plate fin tube heat exchanger, the outside air load in summer can be reduced.
By using high-temperature return water, it can be transferred to cold water with a higher temperature level and at the same time the temperature level can be further improved.In winter, the heat generated inside the room can be used to heat and humidify the outside air. Energy efficiency by using waste heat.

Further, the third plate fin tube heat exchanger and the main heat exchanger are combined and divided into several stages, arranged in series, and provided with a humidifier in each gap. Is adopted, even if the generated heat in the room is small and the return temperature of the high-temperature cold water does not rise so much, the outside air can be effectively used as a heat source by a method of heating and humidifying the outside air in a stepwise manner.

In the outside air conditioner of the present invention, in the system in which the main heat exchanger is a direct contact type heat exchanger, the heat exchange efficiency is improved by the direct contact between the cold water and the air, and the dust and the water solubility of the outside air are improved. There are great effects such as removing harmful gases, simplifying maintenance of the outside air filter, and eliminating the need for a separate humidifier.

[0092]

[Brief description of the drawings]

FIG. 1 is a system explanatory view showing an entire air conditioner according to the present invention;

FIG. 2 is a detailed explanatory view of a fan coil unit used in the air conditioner according to the present invention.

[0093]

[Explanation of symbols]

 1. 1. Chiller unit Compressor 3. Four-way valve 4. 4. Air-cooled condenser 5. Refrigerant pipe valve Same as above 7. Same as above 8. Same as above 9. Second condenser 10. Throttle valve 11. Ice storage evaporator 12. 12. Refrigerant switching valve Same as above 14. 14. Evaporator for air conditioning use hours Refrigerant connection pipe 16. Ice storage water tank 17. Watering device 18. Blower for condenser 19. Low-temperature chilled water circulation pump 20. Outgoing pipe of low-temperature cold water 21. 22. Low temperature cold water return pipe 23. High temperature level cold water circulation pump High temperature level cold water outgoing pipe 24. High temperature level cold water return tube 25. 26. Automatic mixing valve for high temperature cold water and low temperature cold water High temperature level chilled water temperature sensor 27. Hot water circulation pump 28. Chiller unit casing 29. Common stand 30. Roof of building 31. Outside air conditioner 32. Air inlet 33. Outside air filter 34. First plate fin tube heat exchanger 35. Second plate fin tube heat exchanger 36. Third plate fin tube heat exchanger 37. Fourth plate fin tube heat exchanger 38. Main plate fin tube heat exchanger 39. Humidifier 40. Blower 41. Drain pan 42. Water circulation piping 43. Water circulation pump 44. Open water tank 45. Outside air conditioner casing 46. External air supply duct 47. Room for air conditioning 48. Ceiling pocket space 49. Fan coil unit 50. High temperature level cold water main vertical pipe 51. High temperature level cold water return vertical pipe 52. Heat exchangers on each floor 53. Cooling water circulation system piping on each floor 54. High temperature level chilled water circulation pump on each floor 55. Open water tank on each floor 56. Switching valve 57. Same as above 58. Closed cooling tower 59. Switching valve 60. Same as above. Wing 62. Rotating disk 63. Radiation impeller 64. Plate fin tube heat exchanger 65. Fan motor 66. Filter media 67. Drive motor 68. Drive roll 69. Roll spring 70. Take-up roll 71. Air inlet 72. Upper casing 73. Diffuser 74. Air outlet 75. Insect repellent net Opening 77. Impeller inlet 78. Vacuum cleaner tube 79. Electric valve 80. Central vacuum dust removal device 81. Electronic circuit 82. Sensor 83. High temperature level cold water inlet pipe 84. solenoid valve

Claims (22)

[Claims] 1. A minimum amount of outside air taken in per room occupant in an air-conditioning room, and a dehumidifying capacity that can handle and absorb the latent heat load of one room occupant is maintained. The outside air conditioner cools and dehumidifies the outside air and sends it to the room until the low dew point, so that the absolute humidity of the room air is maintained at a predetermined value. The air is cooled by an air conditioner such as a fan coil unit, and circulated through the room to process and absorb the sensible heat load in the room and maintain the temperature of the room air at a predetermined value, thereby controlling the dry bulb temperature and relative An air conditioner characterized by maintaining humidity at a predetermined value. 2. A method of cooling and dehumidifying intake air to a required low dew point by using cold water having a temperature very close to the freezing point obtained by melting ice obtained by operating an ice heat storage device and forming water. The air conditioner according to claim 1. 3. A first plate fin tube heat exchanger is provided at an air inlet of the outside air conditioner, through which outside air whose temperature and humidity are not adjusted is passed, and a second plate fin tube heat exchanger is also provided at an outlet of the outside air conditioner. An exchanger is provided for passing outside air cooled and dehumidified to a low dew point in a main cooler located downstream of the first plate fin tube heat exchanger, and
A water circulation circuit is provided between both plate fin tube heat exchangers, and water is circulated by a circulation pump.In summer, heat is indirectly exchanged between high temperature outside air and low dew point dehumidified air via circulating water. 2. The air conditioner according to claim 1, wherein the air conditioner is cooled to reheat dehumidified air having a low dew point while cooling outside air. 4. An open water tank is provided at a position lower than both plate fin tube heat exchangers on a water circulation circuit circulating between the first and second plate fin tube heat exchangers according to claim 3, and a circulation pump. 2. The air conditioner according to claim 1, wherein when the step is stopped, the water inside the plate fin tube heat exchanger flows down to the open water tank and becomes empty by gravity. 5. An air conditioner, such as a fan coil unit, provided with a third plate fin tube heat exchanger next to the first plate fin tube heat exchanger of claim 3 for circulating cooling of room air. 2. The air conditioner according to claim 1, wherein the cold water whose temperature has risen is used to pre-cool the outside air in summer and pre-heat the outside air in winter. 6. A fourth plate fin tube heat exchanger is provided before or after the second plate fin tube heat exchanger according to claim 3 to cool and dehumidify outside air or cool a sensible heat load in a room. Utilizing exhaust heat on the condenser side resulting from the operation of the refrigerator for removal, the supply air cooled and dehumidified to a low dew point is reheated by the fourth plate-fin tube heat exchanger. The air conditioner according to claim 1, characterized in that: 7. A main plate fin tube heat exchanger for cooling and dehumidifying to a low dew point is installed next to the third plate fin tube heat exchanger according to claim 5, and the temperature is reduced to the freezing point obtained by ice heat storage. 2. The air conditioner according to claim 1, wherein the outside air is cooled and dehumidified with cold water at an extremely close temperature. 8. The air conditioner according to claim 1, wherein the main plate fin tube heat exchanger according to claim 7 is replaced with a water spray type direct contact type main heat exchanger. 9. The third plate fin tube heat exchanger according to claim 5 and the direct contact type main heat exchanger according to claim 8 are divided into the same number of stages and alternately arranged in series along the air flow. The air conditioner according to claim 1, wherein 10. An extremely large number of inner diameters of 1,000 or more.
Capillary tubes of 5 mm or less are connected in parallel,
This is arranged in an ice heat storage tank as a refrigerant evaporator for ice heat storage operation, and heat is directly exchanged with the refrigerant without using antifreeze to form ice, and this ice is thawed during air conditioning use time. 2. The air conditioner according to claim 1, wherein the air conditioner is used for cooling and dehumidifying outside air using cold water having a temperature very close to the freezing point obtained by the method. 11. The refrigerator circuit according to claim 10 is operated by switching a valve operation to an air conditioning use time evaporator provided separately from the ice heat storage evaporator during the air conditioning use time period. Low-temperature chilled water that is very close to the freezing point obtained by melting the ice produced by operating the high-temperature chilled water obtained by operating the chiller at the dew point temperature of the indoor air or at a temperature higher than the dew point temperature of the indoor air during non-air-conditioning hours. Mixed with chilled water at a temperature required to cool and remove indoor sensible heat and at a high temperature level exceeding the dew point temperature of indoor air in a fan coil unit for indoor sensible heat cooling or an air conditioner. The air conditioner according to claim 1, wherein the air conditioner is characterized by the following. 12. An air-cooled condenser is sprinkled with water, and the condensing temperature is reduced by the latent heat of evaporation, in case the refrigerator of the eleventh embodiment operates at a higher evaporation temperature than a normal refrigerator during the air-conditioning use time period. 2. The air conditioner according to claim 1, wherein a chiller unit is used which is kept low or uses a water-cooled condenser to prevent overload of the hermetic compressor. 13. The ice heat storage tank according to claim 10 and the heat storage evaporator housed therein together with all components constituting a refrigerant circuit, such as a compressor, an air-cooled condenser, and an evaporator for use during air conditioning. The air conditioner according to claim 1, wherein a chiller unit integrated on two common mounts is used. 14. When it is necessary to heat the room facing the outer periphery while cooling most of the room in the middle or winter season, cold water is supplied to most of the piping systems and, at the same time, hot water is supplied to the outer periphery. A water-cooled condenser is provided in parallel or in series with the air-cooled condenser to supply water to the piping system of the fan coil unit, and a chiller unit that heats the hot water of the piping system is used. Item 1. The air conditioner according to Item 1. 15. A closed-type cooling tower connected in series or in parallel or switchable in series / parallel to a cooling source circuit of high-temperature chilled water supplied to a fan coil unit or an air conditioner according to claim 11 to reduce the outside air temperature. If the water temperature is sufficiently low and the water temperature at the outlet of the closed cooling tower is lower than the cooling water temperature at the fan coil unit or air conditioner outlet, use this to reduce the cooling by the refrigerator or to achieve the required cooling even if the cooling is stopped. The air conditioning equipment according to claim 1, wherein the equipment is enabled. 16. A fan coil unit installed on a ceiling after introducing dehumidified air to a low dew point and reheated outside air into a ceiling chamber of an air conditioning room as an outside air chamber, as described in claim 1. The air is supplied into the room by suctioning the air, the air in the ceiling is kept at a low dew point, and the heat insulation and dew-prevention of the cooling water pipe inside the ceiling to the fan coil unit are omitted. Air conditioner. 17. A radiating rotary impeller is directly connected to a motor in a state in which the planar shape is square, rectangular, circular, or the like, and close to the upper side of the plate fin tube heat exchanger, the axis is vertical and the lower surface is open. The upper part is surrounded by a casing, the lower part of the plate fin tube heat exchanger, the air suction port from the indoor ceiling surface, through the filter, sucks air and passes through the plate fin tube heat exchanger to cool or heat,
Uses a fan coil unit installed in contact with the ceiling surface, which rotates and pressurizes the radiant impeller, diffuses it around, and blows it out of the room through the ceiling through the air outlet to circulate. Claim 1 characterized in that
Air conditioning equipment. 18. The fan coil unit according to claim 17, wherein the fan coil unit is located near the center of the rotating disk of the radiant impeller.
By making a plurality of holes, and also making an opening in the center of the radiation type impeller in the casing above the radiation type impeller,
When rotating the radiant impeller, the air from the ceiling where the fan coil unit is installed is sucked through a plurality of holes opened in the rotating disk from the opening of the casing, while the lower indoor Recirculated air coming from the air inlet, filter, plate fin tube heat exchanger to the inside, is mixed evenly inside the rotating radiant impeller, and diffused through the diffuser and air outlet to be indoors. The air conditioner according to claim 1, wherein a fan coil unit adapted to supply mixed air to the air conditioner is used. 19. A fan coil unit according to claim 11, which is used for cooling and removing a sensible heat load in a room as described in claim 1, by using cold water having a temperature higher than the dew point temperature of room air when air conditioning is used. , And omit the drain pan, drain piping, heat insulation, etc. around the fan coil unit.
2. The air conditioner according to claim 1, wherein a fan coil unit dedicated to sensible heat cooling is used. 20. The fan coil unit according to claim 19, wherein a moisture sensor is provided in a portion of the heat exchanger where dew condensation is most likely to occur, or a sensor for the relative humidity of the outlet air is provided to detect a situation in which dew condensation occurs. Depending on the signal, increase the fan speed to increase the air volume and reduce the difference between the air inlet and outlet temperatures to prevent dew condensation, or close the solenoid valve provided at the cold water inlet and outlet to stop the flow of cold water. The air conditioner according to claim 1, characterized in that a fan coil unit having a function of preventing dew condensation by using a fan coil unit is provided. 21. A filter made of non-woven fabric is provided below the plate fin tube heat exchanger of the fan coil unit according to claim 17, and both ends of the filter are wound around a roll, and the roll is rotated to make the heat of the plate fin tube heat exchanger. The filter media is reciprocated over the entire length of the exchanger, and a porous or slit type vacuum dust removing tube is provided in contact with one end of the lower surface of the filter media at right angles to the moving direction, and an electric valve is provided. Connected to the centralized vacuum cleaning equipment through, open the electric valve to operate the centralized vacuum cleaning equipment, backwash by reciprocating the filter media, automatically regenerate the filter media and use it semipermanently 2. An air conditioner according to claim 1, wherein said fan coil unit is used. 22. An air conditioner in which a heat source device is intensively installed on a rooftop or the like in a multi-story building and a number of fan coil units or air conditioners are installed on each floor.
A heat exchanger is installed on each floor on a circuit of cold water having a high temperature level used in a fan coil unit or an air conditioner according to claim 11 to cut off piping and edges under pressure from the roof, and an open water tank is provided on each floor. Providing an independent chilled water circulation circuit having a circulation pump, allowing heat exchange in the heat exchangers of each floor to cool the floor, and switching the open water tank to the discharge side and the suction side of the circulation pump. 2. The air conditioner according to claim 1, wherein the air conditioner can be connected.