JP2007225279A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance energy consumption efficiency of an air conditioning facility by elevating a level of an evaporation temperature in a refrigerator used for circulation cooling of cooling water. <P>SOLUTION: This air conditioner intakes outside air at the minimum outside air intake volume required for one existing person in a room under execution of air conditioning, up to a low dew point to hold at least a dehumidifying capacity capable of absorbing a latent heat load for the one existing person or more, by an outside air conditioner 31, the outside air is heat-exchanged with the low-temperature cooling water near to an ice point obtained in an ice heat accumulator, and is cooling-dehumidified to be diffused to the room. An absolute humidity of indoor air is kept thereby at a prescribed value, the indoor air is circulation-cooled in an indoor side by a chiller unit 1 for dealing with the cooling water of a temperature range higher than a dew point temperature of the indoor air, and the latent heat load in the room is absorbed to keep the temperature of the indoor air at the prescribed value, to hold a dry bulb temperature and relative humidity of the indoor air at prescribed values. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to improving and improving the energy saving performance of air conditioning equipment in medium- or large-scale offices or commercial buildings.

  In conventional air-conditioning equipment, the outside air and indoor circulating air are mixed together for cooling and dehumidification, or even if the outside air is cooled and dehumidified separately from the indoor circulating air in advance, the level of the dew point is just the latent heat load in the room. Therefore, the indoor circulating air is also cooled and dehumidified below the dew point temperature of the indoor air to cope with the latent heat load.

  Even if the outdoor air system and the indoor system were separated in the system using ice heat storage, cold water at different temperature levels was not used, but cold water at the same temperature level was used.

  Furthermore, the conventional ice storage chiller unit dislikes that the heat transfer area of the heat exchanger for making ice needs to be increased, increasing the internal volume of the heat exchanger and increasing the refrigerant charge. An antifreeze liquid is used for the heat exchanger for the heat, and the refrigerant is indirectly cooled through heat exchange between the refrigerant and the antifreeze liquid.

  In recent years, the automation of offices has progressed, the number of indoor office automation equipment has increased, and the number of people in the room tends to decrease. With this, the ratio of sensible heat load to the air conditioning load in the room has increased, Conversely, the ratio of the latent heat load is decreasing, and the sensible heat load is overwhelming.

  To handle the latent heat load, the dew point temperature of the room air, that is, the dry bulb temperature of 25 ° C. and the room air condition of 50% relative humidity is about 14 ° C., a temperature lower by several degrees C. Since it is necessary to cool and dehumidify the air, cold water or refrigerant of 5 ° C to 7 ° C is required if considering a temperature lower than 11 ° C to 13 ° C and an effective temperature difference of about 6 ° C in the heat exchanger. For handling the load, basically air with a temperature slightly lower than room temperature is useful for cooling, and even if the temperature difference in the heat exchanger is taken into account, 15 ° C can be achieved by increasing the air volume to some extent. It can be sufficiently cooled with cold water or a refrigerant having a temperature level as high as 10 ° C. of ˜17 ° C.

  Nevertheless, conventional air conditioning equipment is not a system that can handle latent heat and sensible heat separately, so the air conditioning load in recent years, where sensible heat has overwhelmingly accounted for the most, is still 5 ° C ~ Since the low-temperature cold water of 7 ° C. is used, the evaporation temperature of the refrigerator cannot be increased, and the energy consumption efficiency is not improved.

  Furthermore, in recent years, an ice heat storage system that uses nighttime power to relieve the peak of summer daytime in the summer has become widespread, but in addition to the conventional low temperature cold water of 5 ° C to 7 ° C, The evaporating temperature is naturally below the freezing point in order to make ice at 0 ° C by operating the freezer at night, and in fact it is 15 ° C compared to the conventional way to make ice indirectly using antifreeze. Even at 20 ° C., the level of the evaporation temperature is lowered, and the energy consumption efficiency is further reduced.

  In the present invention, the ratio has increased in recent years by separately treating sensible heat that can be cooled with cold water at a high temperature level and latent heat that requires cold water at a temperature level lower than the dew point temperature of indoor air. The sensible heat load is treated with cold water at a high temperature level, and the energy consumption efficiency of the air-conditioning equipment is increased by increasing the evaporation temperature level of the refrigerator used for circulating cooling of this cold water. . Further, the present invention provides a method for solving the problems that accompany it.

  In 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 occupant is set at a low dew point for processing the latent heat load. A recirculating air conditioning system that recirculates and cools indoor air is used exclusively for sensible heat treatment. Of course, there is no problem even if the recirculated air is mixed into the system of the outdoor air conditioner.

  Naturally, in the pleasant air conditioning of the occupants, there is a predetermined minimum amount of outside air per person in the room, but in the present invention, when taking in this amount of outside air and dehumidifying it and supplying it to the room, The difference between the absolute humidity of the indoor air that performs air conditioning 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 intake outside air amount counteracts the amount of water vapor generated by indoor occupants. Was dehumidified below the dew point temperature.

  This eliminates the need to process any latent heat in a recirculation air conditioning system that recirculates and cools indoor air, so that cooling can be performed in a temperature range higher than the dew point temperature of indoor air to cool and remove sensible heat in the room. For example, the indoor temperature and humidity can be maintained at the specified values, and the chilled water used for this can be evaporated by using chilled water at a high temperature level for the treatment of the sensible heat load, which accounts for the overwhelming majority. The energy consumption efficiency of the entire air conditioner can be improved by raising the temperature level.

  Furthermore, in the present invention, in order to reheat the supply air that has been cooled and dehumidified in the outside air conditioning system, heat is circulated between the outside air conditioner inlet and the outlet, and water is circulated between them to indirectly heat the hot inlet air. By replacing, conversely, pre-cooling the outside air and moving a part of the cooling load of the outside air to the indoor load, the cooling of the hot part of the outside air is re-established with the room with high energy consumption efficiency through reheating. The load can be diverted to the circulation air conditioning system.

  In order to ensure the reheating when the outside air temperature is not so high, in the present invention, a heat exchanger installed at the outlet of the outside air conditioner using the waste heat of the cooling water of the refrigerator operated for cooling and dehumidification. Can also be reheated.

  When the outside air temperature is low in winter and the dehumidified air cannot be reheated due to the heat of the outside air, the water circulation according to [0013] is stopped, but it is opened at a position lower than the heat exchanger provided at the inlet and outlet of the outside air conditioner. When a water tank is provided and water circulation is stopped, the water inside the heat exchanger flows down to the open water tank due to gravity and the heat exchanger is emptied, so that heat exchange is performed even when the outside air temperature falls below 0 ° C. Consideration was given to prevent the vessel from freezing and breaking.

  Furthermore, the cold water of the high temperature level 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 3 to precool the high temperature portion of the outside air. As a result, a part of the cooling load of the outside air can be turned to cold water having a high temperature level, and at the same time, the temperature level of the cold water can be further increased to contribute to improvement of energy consumption efficiency.

  This pre-cooling circuit works to preheat the outside air in winter, and can cancel the heating load caused by the outside air by using the sensible heat load in the room.

  In the present invention, the main heat exchanger is a direct contact type heat exchanger to reduce the temperature difference required for heat transfer between cold water and air so that the required cold water temperature level is kept as high as possible. A plate fin tube heat exchanger that precools or preheats the outside air using the cold water used for cooling and removing the sensible heat in the room described in claim 3 is combined on the upstream side, and divided into a plurality of stages along the air flow. It can also be arranged in series so that it is possible to easily humidify the dry outside air in winter with cold water of about 20 ° C.

  The present invention specializes in cooling the sensible heat that occupies most of the air-conditioning load by eliminating the need for processing the latent heat load in the indoor recirculation air-conditioning system, and by raising the level of the chilled water temperature of the cooling system. In order to increase the evaporation temperature level of the refrigerator used there and improve the energy consumption efficiency, the ice storage heat is used to cool and dehumidify the outside air to a low dew point that can cancel out all the latent heat load in the room with the outside air. Cold water having a temperature very close to the freezing point where the ice obtained by the above method was melted was used.

  In the present invention, during the ice heat storage operation, in order to suppress the rate at which the evaporating temperature of the refrigerator is lowered and the energy consumption efficiency is reduced, the use of the conventional antifreeze liquid is canceled and the heat transfer for making ice is performed. In order to keep the balance with the compressor good by suppressing the increase in the internal volume of the refrigerant heat exchanger caused by reducing the stage one step and increasing the heat transfer area to make ice efficiently, the evaporator As a heat transfer tube, an extremely large number of capillary tubes were used in parallel to improve the heat transfer area with a smaller internal volume and a larger heat transfer area than conventional evaporators.

  In addition, in the present invention, in order to prevent deterioration of quality due to refrigerant piping in the field where installation quality control is difficult in practice, all the parts constituting the refrigerant circuit are assembled on a common base and the factory is capable of producing the ice heat storage chiller. To use.

  Since the chiller used in the present invention is operated at an evaporation temperature at a higher temperature level than usual during the air-conditioning use time period, the air-cooled condenser may cause an overload of the compressor at a time when the outside air temperature is high. In order to prevent this, in the present invention, water is sprayed on the condenser of the air-cooled chiller and the condensation temperature is suppressed by the latent heat of vaporization.

  The chiller used in the air conditioner of the present invention performs an ice heat storage operation in an air conditioning non-use time zone, that is, a night time zone, and switches a refrigerant circuit in an air conditioning use time zone, that is, a daytime time zone. Using an air conditioning evaporator provided separately from the evaporator for ice heat storage operation, the cold water having a high temperature level used for sensible heat cooling in the indoor recirculation air conditioning system is circulated and cooled.

  As a result, during daytime operation, not only can the evaporating temperature be significantly increased compared to nighttime ice storage operation hours, but also low-temperature cold water that is very close to the freezing point obtained by melting the ice produced by ice storage. Can be further increased by evaporating the refrigerant in the evaporator, which can greatly increase the energy consumption efficiency of the refrigerator. I can do it.

  In the present invention, the condenser of the refrigeration cycle is sprinkled with water, and the latent heat of evaporation is used to keep the level of condensation temperature low. In addition to this condenser, a second condenser is required in series or in parallel. In response to cooling, the system can be used to supply hot water to systems that require partial heating at the same time as cooling, such as in the middle and winter seasons.

  In the present invention, a closed cooling tower is connected to the chilled water circuit at the high temperature level so that the evaporator can be switched in parallel, in series, or in series / parallel, and the temperature of the chilled water in the return pipe from the indoor recirculation air conditioning system When cooling water having the following temperature was obtained in the closed cooling tower, the closed cooling tower was operated to reduce or stop the operation of the refrigerator to save energy.

  In the present invention, the piping of high-temperature cold water that is sent to the indoor recirculation air-conditioning system is passed through the ceiling of the room to be air-conditioned, and the supply air is cooled and dehumidified to the low-temperature dew point with the outside air conditioner. Since the ceiling pocket is introduced here as a chamber and sucked from a fan coil unit or the like and supplied to the room, the interior of the ceiling pocket is filled with air with a low dew point and condensation is formed on the cold water piping. Insulation and dew prevention are not necessary.

  When the air conditioner according to the present invention is applied to a building on a plurality of floors and a common heat source device is used on each floor, the piping of the high-temperature chilled water circulation system used for the indoor recirculation air conditioning system is connected to each floor. It is also possible to indirectly connect the running pipe and the rising main pipe that passes through each floor vertically and connect to the heat source device via a heat exchanger so that the pressure inside the rising pipe is not applied to the horizontal running pipe. .

  In the present invention, as described above, 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 that is pressure-independent, and the suction water pipe and the discharge pipe of the circulation pump are provided by switching the open water tank. Because the pressure inside the chilled water circulation system is higher than atmospheric pressure while the open water tank is connected to the suction pipe of the circulation pump, it can be connected to the discharge pipe of the circulation pump. While inside, the pressure inside the piping of the cold water circulation system can be kept below atmospheric pressure.

  The ceiling-mounted fan coil unit used in the air conditioner according to the present invention is a plate fin tube heat exchanger that is in contact with the lower side of the axially open lower surface of the rotary rotor wheel and is also open to the lower surface and has no drain pan. A non-woven fabric filter and a suction port are provided along the lower surface thereof to be exposed to the ceiling surface, and the upper surface and the periphery of the radiant rotor wheel are surrounded by a diffuser plate, and the ceiling is also formed around the suction port. The main structure is such that it is connected to the air outlet exposed on the surface.

  According to this structure, air is sucked from the center 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 reaches the outlet on the surrounding ceiling surface. The air circulation path is extremely short, and there is little bending, and extremely efficient air circulation is possible.

  The fan coil unit used in the air conditioner of the present invention has a plurality of holes in the vicinity of the center of the rotary disk of the radial rotary vane, and the upper casing plate also has the center of the radial rotary vane. When the radial rotary impeller is rotated by providing an opening, the air between the blades of the radial rotary impeller is moved to the outer periphery by centrifugal force, and the plurality of holes vacated near the center of the rotary disc From the opening of the upper casing through a single hole, from the ceiling pocket where the fan coil unit is installed, the outside air supplied from the outside air conditioner via the air supply duct is sucked, while the lower side The air from the ceiling passes through the air suction port and filter, and is mixed on average between the circulating air from the room that is cooled and sucked by the plate fin tube heat exchanger and the blades of the radial rotary impeller. Diffuser from the outer periphery , 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 a plate fin tube heat exchanger having a square or rectangular planar shape, and is made of the same non-woven fabric as the plate fin tube heat exchanger. However, when both ends in the length direction are wound around a roll and both rolls are rotated clockwise and counterclockwise, the filter media reciprocates the length between the rolls. A slit-type or multi-hole type vacuum dust removal pipe is installed along one of the rolls so that the slit or hole row is pressed against the air suction surface of the filter media. When the connected central vacuum dust removal device is driven, the dust adhering to the filter media is absorbed, and the filter Media is automatically reverse washing, it was to be played.

  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, which operates a compressor 2 constituting a refrigeration cycle, a four-way valve 3 for switching a refrigerant flow direction, an air-cooled condenser 4, an air-cooled condenser 4 and valves 5, 6, 7, and 8. A second condenser 9 for hot water that can be switched or used in parallel, a throttle valve 10, an ice storage evaporator 11 constituted by connecting a very large number of capillary tubes in parallel, an ice storage evaporator 11 and Air conditioner usage time zone evaporator 14, refrigerant connection pipe 15, etc. that are connected in parallel by switching valves 12, 13, ice heat storage water tank 16, water spray device 17 that sprinkles air-cooled condenser, condensation Blower 18 for equipment, low temperature cold water circulation pump 19, low temperature cold water outgoing pipe 20, low temperature cold water return pipe 21, high temperature level cold water circulation pump 22, high temperature level cold water outgoing pipe 23, high temperature level cold water It consists of a pipe 24, an automatic mixing valve 25 for high temperature and low temperature cold water, a sensor 26 for high temperature and cold water temperature, a hot water circulation pump 27, a casing 28, etc., all of which are mounted on a common frame 29. To be unitized and installed on the rooftop 30 of the building.

  In the figure, reference numeral 31 denotes an outside air conditioner, which is an air inlet 32, an outside air filter 33, a first plate fin tube heat exchanger 34, a second plate fin tube heat exchanger 35, and 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 40, drain pan 41, first plate fin tube heat exchanger and second plate fin tube heat exchanger The water circulation pipe 42, the water circulation pump 43, the open water tank 44, the outdoor air conditioner casing 45, and the like are connected to the roof 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 to each floor, and has a ceiling pocket of a room 47 that performs air conditioning on each floor as a chamber. 48, and the outside air cooled and dehumidified from the outside air conditioner 31 to a low dew point of 7 ° C. and reheated to a temperature of about 25 ° C. near the room temperature is blown out.

  In the figure, 49 is a fan coil unit dedicated to sensible heat cooling, and 54 units are installed on the ceiling surface of the air-conditioning room 47. The chiller unit 1 has a high temperature level 16 ° C. cold water outlet 23, a high temperature level 21 ° C. A high temperature level cold water return main pipe 50 connected to each of the cold water return pipes 24, a high temperature level cold water return main pipe 51, and a high temperature of each floor connected to each floor via a heat exchanger 52 on each floor. It is connected to a chilled water circulation system pipe 53 having a level, an outgoing temperature of 17 ° C., and a return temperature of 22 ° C., and chilled water at a high temperature level is circulated and supplied by a chilled water circulation pump 54 at each high temperature level to circulate air in a room 47 for air conditioning. At the same time as cooling and removing sensible heat, the outside air is adjusted by the outside air conditioner 31 and the outside air supplied to the ceiling space 48 through the outside air supply duct 46 is sucked and supplied to the room.

  Each floor open water tank 55 is provided in relation to the high temperature level chilled water circulation system piping 53 on each floor, and this is provided by valves 56 and 57 respectively provided on the suction side and the discharge side of each high temperature level chilled water circulation pump. It was possible to connect by switching to either.

  In the air conditioner according to the present invention, the chiller unit 1 is operated in a non-air-conditioning period, that is, in the nighttime period of 14 hours from 18:00 to 8:00 on the following day, ice is stored in the ice storage water tank 16 to produce ice. store. In this case, the switching valves 12 and 13 are operated so that the refrigerant passes through the ice heat storage evaporator 11 of the chiller unit 1, and the compressor 2 is operated with the four-way valve in the cooling position, so that the air-cooled condenser 4, the water spraying device 17 is actuated to sprinkle water, and the outside air for cooling and cooling is passed by the condenser blower 18, and heat is taken from the water in the ice heat storage water tank 16 to the ice heat storage evaporator 11, Water is sprayed by the sprinkler 17 and the heat is radiated from the air-cooled condenser 8 whose temperature is kept low by the latent heat of evaporation.

In this example, the capillary tube constituting the ice heat storage evaporator is a copper tube formed by bending a straight tube of 1.5960 mm in diameter and 2.1 mm in diameter and 4960 mm in the center to 180 ° to 5R and shaping it into a hairpin shape. 2500 mm long, 1200 mm wide, 1250 mm long FRP ice heat storage water tank 16, with 7500 pieces at a pitch of 10 mm vertically and horizontally with the bent part down, and 60 pieces with a diameter of 9 mm and a length of 1200 mm respectively. The refrigerant outlet header is connected to 60 refrigerant inlet headers and has a total heat transfer area of 245 m ² , while its volume is less than 126 liters, and an effective volume of 3600 liters containing water up to 2400 mm in the ice heat storage water tank 16. Only 3.5%. Further, the volume of the evaporator is 70 liters, which is appropriate in view of the limit of the refrigerant holding amount inside the refrigeration cycle by the compressor, and allows the water in the ice heat storage water tank to be directly cooled by the refrigerant.

If a heat transfer tube with a diameter of 16 mm is used like the heat exchanger of an ice heat storage water tank that has been commercialized, a total length of 4880 m is required to obtain the same heat transfer area of 245 m ² , and the volume is 980 liters. As a result, the volume of the ice heat storage water tank is reduced by 27% or more, and the internal volume is also 750 liters. Is not suitable at all.

The heat transfer area of 245 m ² is an evaporation temperature of −0.5 ° C., the cooling capacity of 26 kW incorporated in the chiller unit 1, and the operation of the compressor 2 with an input of 6 kW on the outer surface of the ice storage evaporator 11 made of capillary tube. Icing can occur. As the operation time elapses, the thickness of the ice accretion 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. An ice cylinder of less than 4mm in length will be in contact.

  If the operation of the compressor 2 is further continued, the ice cylinders come into contact with each other, and in the next stage, the gaps are filled. Even when the volume of ice reaches 95% of the volume of the ice heat storage tank, the thickness of the ice is only 4.5 mm at the portion facing the remaining gap. The volume of ice at this point is 3410 liters, the amount of heat stored due to the latent heat of this ice is 290 kwh, and water that becomes effective when the temperature of the water in the ice heat storage water tank 16 rises to 17 ° C. during the air conditioning time zone. The total heat storage amount is 357 kwh by adding the amount of heat storage by sensible heat of 357 kwh, which corresponds to the cooling capacity of 13.7 hours of operation of the compressor 1 with a cooling capacity of 26 kw, which is in good agreement with the 14 hours of the night time zone Yes.

  The thermal conductivity of ice is very low with respect to 85 of steel and 400 of copper and remains only 2.2, so the ice thickness at the time of completion of ice heat storage greatly affects the performance of the ice heat storage evaporator. Therefore, the heat transfer coefficient inside and outside the pipe including ice shows a different value before the start of icing and when the heat storage is completed, and the thickness of 4.5 mm ice is only 28% lower than before the start, As in the case of using antifreeze, for example, when the thickness of the ice is 40 mm, the temperature is reduced by 80%. When the temperature difference between the ice and the refrigerant is 0.5 ° C. at the beginning of icing, The former requires 0.7 ° C., and the latter requires 5 times 2.5 ° C.

  In the case of an ice storage chiller that uses a commercial antifreeze liquid, heat transfer occurs due to a change in the temperature of the antifreeze liquid itself. Therefore, there is a temperature difference between the inlet and outlet portions of the heat transfer tube. Furthermore, it is added to the temperature difference between the evaporating temperature of the refrigerant and the antifreeze in the evaporator, and the evaporating temperature is 10 ° C. to 15 ° C. compared to the chiller unit used in the air conditioner of the present invention, which makes ice directly with the refrigerant. Not only was the temperature lowered, but there were also disadvantages such as non-uniform icing on the heat transfer tube surface due to temperature differences at the inlet and outlet of the antifreeze.

When the ice heat storage operation is completed and the air conditioning use time zone, that is, the daytime time zone, the low temperature cold water circulation pump 19 of the chiller unit 1 is operated, and the main plate fin tube heat exchanger 38 of the outside air conditioner 31 is brought to a freezing point. Circulate and supply cold water at extremely low temperatures. 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 34 and 36, the main plate fin tube heat exchanger 38, the fourth through the air suction port 32. The plate fin tube heat exchanger 37 and the second plate fin tube heat exchanger 35 are sequentially passed through the temperature-adjusted outside air to be pressurized and passed through the outside air supply duct 46 and the ceiling of the room 47 for air conditioning. Air is supplied to the pocket space 48. The outside air conditioner of the present embodiment has an air volume of 1250 m ² / h, a passage area of each heat exchanger is 0.3 m ² , a height of 500 mm, and a width of 600 mm.

  In the summer, the water circulation pump 43 is operated to suck up 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 open through the second plate fin tube heat exchanger 35. Return to water tank 44 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 34, the dehumidification with a low dew point of 7 ° C. is performed by the second plate fin tube heat exchanger 35. Heat is exchanged with circulating water whose temperature has been lowered to 17 ° C. through heat exchange with air, and 7.5 kW heat is taken away and cooled and dehumidified to a saturation point of 23 ° C., and the circulating water is heated up to 29 ° C.

  In exchange for this, in the second plate fin tube heat exchanger 35, the freezing point sent from the ice storage water tank 16 of the chiller unit through the low temperature cold water circulation pump 19 via the low temperature cold water outlet pipe 20 in the main plate fin tube heat exchanger 38. Low-temperature air that has been heat-exchanged with low-temperature cold water very close to 7 ° C. and cooled and dehumidified to 7 ° C., water that is heated to 29 ° C. in the first plate fin tube heat exchanger 34 and supplied via the water circulation pipe 42 The outlet air is reheated to 25 ° C. through heat exchange, and conversely, the circulating water at 29 ° C. is cooled to 17 ° C. The amount of exchange heat in the second plate fin tube heat exchanger 35 is the same as the amount of exchange heat in the first plate fin tube heat exchanger 34.

  When the water circulation pump 43 is stopped in the season when the outside air temperature is low and the dew point of 7 ° C is not useful for reheating the cooled dehumidified air, the circulating water flows down to the open water tank located at the bottom of the water circulation system. The first plate fin tube heat exchanger 34 and the second plate fin tube heat exchanger are empty.

  The third plate fin tube heat exchanger 36 receives from the cold water return main vertical pipe 51 at a high temperature level the heat generated by cooling the sensible heat generated in the room by a circulating air-conditioning system in the room by the heat exchanger 52 on each floor. High temperature level return chilled water whose temperature has increased to 21 ° C. and 180 liter / min are passed through, and heat exchange is performed with the outside air that has become saturated air at 23 ° C. via the first plate fin tube heat exchanger 34. Cooling and dehumidification of 1.5 kw is performed until a saturation point of 22 ° C.

  The amount of heat exchange in the third plate fin tube heat exchanger 36 is small in the summer, but when the outside air temperature is 0 ° C in the winter, it receives the heat of the return cold water at a high temperature level of 21 ° C. Given heat of 6.7 kw, the temperature rises to 16 ° C., adiabatic humidification by the ultrasonic humidifier 39, and 6 ° C. saturated air is supplied to the room to keep the relative humidity of the room air at 40% or more. Not only will it be a sufficient amount of heat as a heat source, it will also account for about 11% of sensible heat removal in the room.

  In the fourth plate fin tube heat exchanger 37, the outside air temperature is not so high, the reheating by the first and second plate fin tube heat exchangers 34, 35 is insufficient, and the outside air with a low dew point of 7 ° C. If the reheat temperature does not reach 25 ° C., the second condenser 9 of the chiller unit 1 can be used together with the air-cooled condenser 4 by appropriately operating and switching the valves 5, 6, 7, 8. Through which hot water of 35 ° C. is circulated and supplied by the hot water circulation pump 27 and reheated to 25 ° C. by 7.5 kw.

  When the warm water from the second condenser 9 has a part of the air conditioning system that needs heating in winter, the valve is switched so that the same warm water can be supplied to the air conditioning system. Even when the air conditioner is cooling, it is possible to supply warm water to the air conditioning system to be used for heating.

  In the main plate finned tube heat exchanger 38, the outside air precooled to the saturation point of 22 ° C. in the third plate finned tube heat exchanger 36, and the low temperature cold water forward pipe 20 from the ice heat storage water tank 16 by the low temperature cold water circulation pump 19. 17.4 kw heat exchange is performed with cold water close to the freezing point sent through, and the outside air 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 formed of a number of sheets made of thin resin. Further, the third plate fin tube heat exchanger 36 and the direct contact heat exchanger may be combined, divided into a plurality of stages, and arranged in series. Further, the third plate fin tube heat exchanger may be used. 36 and the main plate fin tube heat exchanger 38 may be combined and divided into a plurality of stages, and each stage may be arranged in series by sandwiching an adiabatic humidifier such as an evaporative humidifier or an ultrasonic humidifier.

  The above-mentioned cooling to a dew point of a low temperature of 7 ° C. is economically realized for the first time with low-temperature cold water close to the freezing point due to ice heat 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 air with a low dew point of 7 ° C. is 6.2 g / kg per kg of dry air in the humid air, and the condition of the room air in the air-conditioned room 47 is a dry bulb temperature of 25 ° C. and a relative humidity of 50%. Then, since the amount of water vapor contained in the indoor air is similarly 10 g / kg per kg of dry air, air with a dew point of 7 ° C. contains 10 g / kg−6.2 g / kg = 3.8 g / kg of water vapor content. Less is.

3.8 g / kg × 1250 m ² /h×1.2 kg / m ² (Air density) = If air with a dew point of 7 ° C., which is 3.8 g / kg less than the amount of water vapor contained, is supplied into the 1250 m ² / h room. The load of water vapor generated in the room at 5700 g / h can be canceled out. Since the normal water vapor generation amount per person in the room is about 100 g / h, the water vapor load of 5700 g corresponds to 57 persons in the room, and is practically used for one person in the room. state outside air intake quantity 25m just when dividing the fresh air intake amount 1250 m 2 / ^h in this embodiment by 2 / ^h, with the fact that corresponding to occupants 50 persons, a margin of about 14% to dehumidification capacity that Thus, without increasing the amount of outside air taken in vainly, the room latent heat load is left to the 100% outside air conditioner system, and only the sensible heat is removed in the indoor recirculation air conditioning system.

  In this way, in the indoor recirculation air conditioning system, only the sensible heat is removed by cooling, and there is no latent heat load, so there is no need to lower the air for cooling below the dew point temperature of the room air. In other words, it is only necessary to cool to about 19 ° C., which is 6 ° C. lower than room temperature. For this cooling, cold water having a temperature level higher than the dew point temperature, for example, 17 ° C. at the inlet of the fan coil unit 49 and It is in time with cold water at a high temperature level such as 22 ° C.

  In the present embodiment, the compressor is operated in the air-conditioning use time zone, the daytime time zone of 10 hours from 8:00 to 18:00, as in the nighttime zone. However, unlike the nighttime zone, the refrigerant circuit is operated by the switching valves 12 and 13. And the compressor 14 is operated at an evaporation temperature as high as 15 ° C. by using the evaporator 14 for the air-conditioning use time zone, and the floor cold water circulation pump 54 from the fan coil unit of the indoor recirculation air-conditioning system The high temperature level chilled water of 22 ° C. sent through the high temperature chilled water circulation system piping 53 is heat-exchanged in each floor heat exchanger 52 and cooled to 17 ° C. As a result, the temperature is increased to 21 ° C. Of the 180 liter / min of returned cold water, 20 lit / min is returned to the ice heat storage water tank 16, and the remaining 160 lit / min is cooled to 18 ° C., which is very close to the freezing point from the ice heat storage water tank 16. Hot cold water is mixed by the automatic mixing valve 25 and is set to 16 ° C. by the signal of the high temperature level cold water temperature sensor 26, via the high temperature cold water forward main pipe 50 and the return main vertical pipe 51. Then, the chiller unit 1 is circulated by a chilled water circulation pump 22 having a high temperature level.

  Thus, the compressor 2 of the chiller unit 1 has an evaporating temperature of −0.5 ° C. at the initial stage of the heat storage operation and −0.7 ° C. when the ice heat storage is completed, and the average evaporation temperature for 14 hours in the night time zone. Is operated at −0.6 ° C., and for 10 hours in the daytime period, it is operated at an evaporation temperature of 15 ° C. On the other hand, with respect to the condensation temperature, water is sprayed on the air-cooled condenser 4 by the water spraying device 17, and the condensation temperature is kept low by the latent heat of vaporization of the water spray, so the average is 37 ° C in the daytime and 35 in the nighttime. As a result, it is possible to avoid the overload operation that is likely to occur when the compressor 2 is operated at a high evaporation temperature, and at the same time, the cooling capacity is improved, the cooling capacity in the daytime period is 44 kW, and the input is 6 .5kw and 10 hours are 440kwh and 65kwh respectively, while the cooling capacity at night time is 26kw, the same input is 6.1kw and 14 hours is 364kwh and 85.4kwh respectively and 804kwh in 24 hours a day As a result, only 150.4 kwh of power is consumed for the cooling effect, and the energy consumption efficiency reaches 5.4.

  To this value, the power of the condenser blower 18 is 0.1 kW, the high temperature level of the cold water circulation pumps 19 and 54 is 0.9 kW, the low temperature cold water circulation pump 22 is 0.1 kW, the power of the blower 40 is 0.4 kW, The total energy consumption efficiency including the daily power consumption of 21.8 kwh obtained by adding 0.54 kw or the like for 54 fan coil units multiplied by the respective operation time is a value greater than 4.5.

  In the figure, 58 is a standard cooling system that is connected to the evaporator 14 for use in air-conditioning hours in series or in parallel, or via two three-way switching valves 59 and 60 with high temperature chilled water pipes so that each can be used alone. In a closed cooling tower with a capacity of 45 kw, when the outside air temperature is low and the outlet temperature of the closed cooling tower 58 is lower than the return temperature of the cold water at a high temperature level, water is passed through and operated, and the evaporator 14 for air conditioning time zone is operated. The power consumption of the compressor 2 is reduced. The above-mentioned hermetic cooling tower may be used as a heat dissipating means for a compressor refrigeration cycle of a chiller by replacing the air-cooled condenser with a water-cooled condenser.

  When the outside air temperature further decreases and the outlet temperature of the closed cooling tower 58 becomes lower than the temperature of the chilled water having a high temperature level, the switching valves 59 and 60 are operated and switched to use the evaporator 14 for the air conditioning time zone. Instead, cooling is possible only with the closed cooling tower 58. When the temperature of the cold water at a high temperature level is set to 17 ° C., taking the Kanto region as an example, the sealed cooling tower 58 is used during the six months from November to April of the following year when the average outside air wet bulb temperature is lower than 12 ° C. If only a large closed type cooling tower is used, it is possible to cool from October to May of the following year using only this large type closed type cooling tower.

  In addition, when the outside air temperature is high and the outlet temperature of the sealed cooling tower is higher than the chilled water return temperature at a high temperature level, the switching valves 59 and 60 are operated and switched so that the sealed cooling tower 58 does not pass water. Specializing in the air-conditioning use time zone evaporator 14.

FIG. 2 is a detailed explanatory view of the fan coil unit 49 mainly used in the air conditioner according to the present invention. In the figure, reference numeral 61 denotes 36 pieces of 180 mm × 60 mm 2 mm thick attached radially to a rotating disk 62 having a diameter of 500 mm. The blade is made of resin together with the rotating disk 62 to constitute a radial-type rotating impeller 63. 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. The fan motor 65 attached to the center of the upper part in the axis perpendicular direction has the above-described radial rotary impeller 63 at the end of the axis. Is directly connected. In this embodiment, the cooling capacity of the fan coil unit is 1.2 kW, the air volume is 10 m ² / min, and the power consumption of the blower is 10 watts.

  In the figure, reference numeral 66 denotes a filter medium having a width of approximately 600 mm which is substantially the same as that of the plate fin tube heat exchanger 64 installed adjacent to the lower side of the plate fin tube heat exchanger 64. The drive roll 68 that is 30 mm in diameter and can be rotated in the forward and reverse directions by the drive motor 67 and the roll spring 69 always apply tension to the filter media 66 to keep the filter media 66 flat. The filter media 66 is wound around a take-up roll 70 having the same diameter of 30 mm that is in contact with the lower surface of the plate fin tube heat exchanger 65 and can be moved in parallel over the entire length of 500 mm. Yes. Further, an air suction port 71 that opens to the room 47 that performs air conditioning is connected along the ceiling surface below the filter medium 66.

  In the figure, 72 surrounds the radiant rotary impeller 63, and the periphery is molded as a diffuser 73 to open the air sent from the periphery of the radiant rotary impeller 63 to the room 47 where air conditioning is performed on the surrounding ceiling surface. It is an upper casing attached so as to be led to the air outlet 74 and has an opening 76 having a diameter of 100 mm with an insect repellent net 75 at the center and opens to the ceiling pocket 48.

  In the vicinity of the center of the rotary disk 62 of the radiant rotary impeller 63, there are 36 impeller inlets 77 with a diameter of 36 mm located in the gap between the 36 wings 61, and the radiant rotary impeller 63 rotates. Then, the air cooled by the cold water at a high temperature level in the plate fin tube heat exchanger 64 from the room 47 that performs air conditioning below is passed through the air suction port 71 and the filter medium 66, and the blades of the radial rotary impeller 63. At the same time as the air is sucked into the gap 61, the opening 76 having a diameter of 100 mm in the central portion of the upper casing 72 and 36 blades having a diameter of 10 mm near the center of the radial rotary impeller 64 are sucked from the ceiling pocket space 48. Similarly, the air is sucked into the gap between the blades 62 of the radiant rotary impeller 64 through the port 77, and both airs are pressurized by centrifugal force while being mixed on the average and passed through the surrounding diffuser 73 and the air outlet 74. , Blown into the room 47 to perform the air conditioning.

While the fan coil unit 49 is in operation, the filter medium 66 filters air sucked from the air-conditioned room 47, and dust in the air adheres to the filter medium 66. In order to regenerate so that the filter media 66 is not clogged by the attached dust, the filter media 66 faces the drive roll 68 and the fill media 66 so that the filter media 66 and the multi-hole row or slit are in contact with each other. A vacuum dust removing pipe 78 with one end blinded is provided, and the other end is connected to a central vacuum dust removing device 80 via an electric valve 79.

  The central vacuum dust removing device 80 is operated while the filter media 66 is reciprocally translated over the entire length of the plate fin tube heat exchanger 64 by the forward and reverse rotation of the drive roll 68, and the motorized valve 79 is opened. Then, the dust adhering to the filter media 66 is sucked and backwashed to regenerate the filter media 66.

  In the air conditioner according to the present invention, the fan coil unit 49 is supplied with the low dew point air supply from the outside air conditioner 31 through the ceiling space 48, so there is no need to remove the latent heat load in the room and A drain pan is not included because sensible heat is used for cooling and removal using cold water at a temperature level higher than the dew point temperature.

  However, it is desirable to prevent the occurrence of a water leakage accident due to sudden increase in the amount of water vapor in the room air due to a sudden increase in the number of people in the room, and condensation on the plate fin tube heat exchanger 64. . Therefore, the electromagnetic valve provided in the portion of the inlet pipe 83 of the cold water having a high temperature level by attaching the sensor 82 of the electronic circuit 81 for sensing moisture to a suitable portion of the plate fin tube heat exchanger 64. 84 was closed to stop the inflow of high temperature cold water so that no further condensation occurred. In another embodiment, the rotation speed of the fan is increased by the signal from the electronic circuit 81, the air volume is increased, and the difference between the inlet air temperature and the outlet air temperature is reduced to prevent condensation. This moisture sensing may be replaced with sensing the relative humidity of the outlet air.

  Since the present invention is configured as described above, many effects can be obtained as follows. First, with air conditioning in office buildings, etc., where the ratio of sensible heat load has increased with the recent shift to OA, the supply air dew point temperature of the intake outside air system is sufficiently lowered to about 7 ° C., and thereby the latent heat load in the room As a result, the indoor sensible heat load can be cooled at a temperature level higher by 10 ° C. or more than conventional, that is, with cold water having a forward temperature of about 16 ° C. The evaporating temperature of the refrigeration cycle can be greatly increased, and the energy consumption efficiency has been improved nearly twice.

  In the present invention, in these intelligent buildings that require cooling from the intermediate period to the winter season, a large closed cooling tower is connected to the chilled water circulation system so that it can be used in conjunction with the chiller evaporator. During the period from October to May of the following year, it was possible to cool with outside air without operating the refrigerator during the air-conditioning usage time, and the annual energy consumption efficiency was greatly improved.

  In the present invention, in order to sufficiently lower the supply air dew point temperature of the intake outside air system, unlike conventional cooling methods, low-temperature cold water by ice heat storage is used, but in the present invention, a conventional ice heat storage chiller is used. Since ice is made using antifreeze, the evaporation temperature at the time of ice making is low, and therefore the energy consumption efficiency is low. Therefore, an evaporator with a large heat transfer area and a very small volume using a capillary tube is used. This makes it possible to make ice directly with the refrigerant gas, and the energy consumption efficiency during ice making is also doubled.

  The invention of the evaporator using the capillary tube not only reduces the thickness of the icing by reducing the pitch of the heat transfer tubes, and improves the heat transfer rate, but also improves the ice storage efficiency in the ice heat storage water tank by nearly 30%, No antifreeze equipment is required, the entire chiller unit can be reduced in size and weight, and the chiller unit can be assembled on a common stand to produce the chiller unit at the factory, eliminating the problem of quality control due to on-site assembly. done.

  In the chiller unit of the present invention, the compressor is operated at an evaporation temperature higher by 10 ° C. or more than the conventional one in order to improve energy consumption efficiency. Therefore, in the air-cooled type, when the outside air temperature is high, the commercially available compressor is overloaded. Become. To prevent this, a watering device was attached to the air-cooled condenser, and the condensation temperature was kept low by using the latent heat of vaporization of the watering. This has the effect of lowering the condensation temperature by 5 ° C. or more than the condensation temperature of the water-cooled condenser, making the equipment simpler and cheaper than the water-cooled type, and greatly contributing to the energy saving of the refrigeration cycle.

  In the present invention, this feature 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, there is a possibility of causing a water leakage accident due to condensation in a duct on the way, In order to prevent the possibility of affecting the temperature distribution, and to further improve the energy consumption efficiency of the entire apparatus by transferring the load to cold water with high energy consumption efficiency at a high temperature level. Reheat the outside air with a low dew point of ℃ to near 25 ℃ of room temperature.

  Therefore, in the present invention, in addition to the air-cooled condenser, a water-cooled second condenser is provided, and the waste heat is used as a heat source for the reheating to reheat the outside air. The condensing temperature of the compressor was lowered to improve energy consumption efficiency on both sides. The second water-cooled condenser can supply hot water to a part of the system when heating is necessary even though most of the building is a cooling load.

  In the present invention, indoor sensible heat cooling is performed using chilled water at a temperature level higher than 10 ° C., which requires a conditioned air volume that is nearly twice that of conventional ones. The number of times of direction change is extremely high inside the unit by skillfully combining it with a heat exchanger that eliminates the need for a drain pan by using the air flow system of the present invention by using a radial fan incorporating a radial rotary impeller. A low-speed, low-speed airflow structure was formed, air pressure loss was reduced, and the mechanical efficiency of blowing was improved to nearly three times.

  As a result, even if the air-conditioning air volume increases nearly twice, the blast power can be reduced conversely, and the air-conditioning air volume increases to improve the indoor air volume distribution and temperature distribution. The habitability improved compared to the air conditioning system. In particular, we were able to significantly improve the low temperature of the air blown by conventional ice heat storage air-conditioning and the decrease in living comfort due to the small amount, while using ice heat storage.

  As described above, the fan coil unit according to the present invention uses a radial fan, but a hole is made near the center of the rotating disk, an opening is also formed in the upper casing at the same position, and the fan coil unit is installed. Since the ceiling pocket air is sucked in from the ceiling pocket without any bending, it can be mixed on average in the recirculation air from the room and the radial flow impeller, improving the mechanical efficiency of the outside air flow, The distribution of outside air is also good, and the ceiling pocket is made to function as an outside air chamber, so the ceiling pocket is filled with air with a low dew point to supply cold water to the fan coil unit etc. in this space For high-temperature chilled water pipes, etc., it was not necessary to keep the pipes warm and to prevent dew, and the equipment costs could be reduced.

  In the air conditioning system according to the present invention, it is economically necessary to use the fan coil unit having high mechanical efficiency for blowing air. However, in the present invention, this is a disadvantage of the conventional fan coil unit system. The problem of water leakage accident from the water pipe and the maintenance replacement of the filter were solved.

  In other words, the drain pipe is unnecessary for the characteristics of the system in the air conditioning system according to the present invention for the water pipe, so the drain pipe is eliminated, and the chilled water circulation pipe is separated on each floor in order to separate the pressure relationship with the heat source device on the upper floor. A heat exchanger is installed to make each floor an independent circulation circuit, and an open water tank is provided here so that it can be switched to either the suction side or the discharge side of the circulation pump. By connecting to the suction side of the pump, filling the piping system with water, removing the air, and then switching to the discharge side, it is possible to circulate cold water while keeping the inside of the water circulation piping system at a pressure lower than atmospheric pressure. Can completely prevent water leakage accidents.

  The fan coil unit according to the present invention has a roll drive type auto-regenerative filter media in contact with the suction port, and a large number of units installed are connected to the piping of a series of central vacuum dust removers via motorized valves, respectively. Since it is possible to regenerate each unit, it is not necessary to replace the filter, and it can be maintained fully automatically.

  In the outdoor air conditioner according to the present invention, in the summer, the first and second plate fin tube heat exchangers for reheating the outside air dehumidified to the low dew point with the heat of the outside air and simultaneously cooling the outside air are installed, and the water circulation pump Since the water is circulated between both heat exchangers to exchange heat, the outside air load is reduced from the conventional level, and a part of the outside air load is transferred to cold water at a high temperature level to improve energy consumption efficiency. I was able to raise it.

  If the pump is stopped in the season when the outside air temperature is low and the dehumidification air at low dew point is not effective, the circulating water will naturally flow into the open water tank installed below and the heat exchanger will be emptied. In winter, freezing accidents of heat exchangers due to low temperature outside air can be prevented naturally.

  In the present invention, by installing a third plate finned tube heat exchanger, the outdoor air load in summer is transferred to cold water having a higher one-stage temperature level using the return cold water having a higher temperature level, and at the same time, the temperature level is further improved. In winter, the generated heat in the room can be used to heat the outside air and heat source for humidification, and the energy consumption efficiency can be increased by using waste heat.

  The third plate fin tube heat exchanger and the main heat exchanger are combined and divided into several stages, arranged in series, and the outside air conditioner system according to the present invention having a humidifier in each gap is adopted. For example, even when the heat generated in the room is small and the return temperature of the cold water at a high temperature level does not increase so much, it can be effectively used as a heat source by heating and humidifying the outside air stepwise.

  In the external air conditioner of the present invention, the main heat exchanger is a direct contact type heat exchanger. In addition to improving heat exchange efficiency by direct contact between cold water and air, dust and water-soluble harmful gas from the outside air can be removed. It has a great effect of removing and simplifying the maintenance of the outside air filter and making the installation of a humidifier unnecessary.

These are system | strain explanatory drawings which show the whole air conditioning apparatus by this invention. These are the detailed explanatory drawings of the fan coil unit used for the air conditioning apparatus by this invention.

Explanation of symbols

1. Chiller unit 2. 2. Compressor Four-way valve 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 heat storage evaporator 12. Refrigerant switching valve 13. Same as above 14. 15. Air conditioner usage time evaporator Refrigerant connection pipe 16. Ice storage tank 17. Watering device 18. Condenser blower 19. Low temperature cold water circulation pump20. Low temperature cold water outgoing pipe 21. Low temperature cold water return pipe 2
2. High temperature level cold water circulation pump 23. High temperature level cold water outlet pipe 24. High temperature cold water return pipe 25. Automatic mixing valve for cold water of high temperature level and cold cold water 26. High temperature level cold water temperature sensor 27. Hot water circulation pump 28. Chiller unit casing 29. Common mount 30. Building roof 31. Outside air conditioner 32. Air inlet port 33. Outside air filter 34. First plate fin tube heat exchanger 35. Second plate fin tube heat exchanger 36. Third plate finned tube heat exchanger 37. Fourth plate fin tube heat exchanger 38. Main plate finned 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. Outside air supply duct 47. Air-conditioning room 48. Ceiling pocket space 49. Fan coil unit 50. High temperature cold water main pipe 51. High temperature cold water return main pipe 52. Heat exchanger on each floor 53. Cold water circulation system piping on each floor 54. Each floor cold water circulation pump at a high temperature level 55. Open water tank on each floor 56. Switching valve 57. Same as above 58. Closed cooling tower 59. Switching valve 60. 61. Wing 62. Rotating disk 63. Radiant rotary impeller 64. Plate fin tube heat exchanger 65. Fan motor 66. Filter media 67. Drive motor 68. Drive roll 69. Roll spring 70. Winding roll 71. Air inlet 72. Upper casing 73. Diffuser 74. Air outlet 75. Insect net 76. Opening 77. Impeller inlet 78. Vacuum dust removal tube 79. Motorized valve 80. Central vacuum dust removal device 81. Electronic circuit 82. Sensor 83. High temperature cold water inlet tube 84. solenoid valve

Claims (7)

  Up to a low dew point that retains more dehumidification capacity than can process and absorb the latent heat load of one occupant with the minimum amount of outside air intake per occupant in the air-conditioned room The outside air is taken in by an outdoor air conditioner, and heat is exchanged with low-temperature cold water at a temperature close to the freezing point obtained by an ice heat storage device. The air is cooled and dehumidified, and blown into the room. Then, the indoor air is circulated and cooled by a chiller unit that processes cold water in a temperature range higher than the dew point temperature of the room air, and the sensible heat load of the room is treated and absorbed to keep the temperature of the room air at a predetermined value. An air conditioner that maintains a dry bulb temperature and a relative humidity at a predetermined value.   The first plate fin tube heat exchanger is provided at the air inlet of the outdoor air conditioner, the outside air whose temperature and humidity are not adjusted is passed through the air plate, and the second plate fin tube heat exchanger is also provided at the outlet of the outdoor air conditioner. The main cooler at the rear of the first plate finned tube heat exchanger passes outside air cooled and dehumidified to a low dew point, and between both the first and second plate finned tube heat exchangers. A water circulation circuit is provided to circulate water with a circulation pump, and in the summer, heat is indirectly exchanged between the high temperature outside air and the dehumidified air with a low dew point through the circulating water to cool the outside air and simultaneously reduce the low dew point. 2. The air conditioner according to claim 1, wherein the dehumidified air is reheated.   A third plate fin tube heat exchanger is provided next to the first plate fin tube heat exchanger of claim 2, and is used in an air conditioner such as a fan coil unit for circulating cooling of indoor air. The air conditioning apparatus according to claim 1, wherein the cool air having increased is passed through the air to precool the outside air in summer and preheat the outside air in winter.   An extremely large number of 1000 or more capillary tubes having an inner diameter of 1.5 mm or less and an outer diameter of 2.1 mm or less are connected in parallel, and these are arranged in an ice heat storage tank as a refrigerant evaporator for ice heat storage operation. Use ice water to cool and dehumidify the outside air using cold water at a temperature very close to the freezing point that is obtained by melting the ice directly during the air-conditioning hours without using antifreeze. The air conditioner according to claim 1.   The circuit of the refrigerator according to claim 4 is operated by switching to an air-conditioning use time zone evaporator provided separately from an ice heat storage evaporator during the air-conditioning use time zone, and the evaporation temperature is set to a dew point of room air. High temperature cold water obtained by operating at or higher temperature is mixed with low temperature cold water close to the freezing point obtained by melting the ice made by heat storage operation during the non-air-conditioning time zone, The sensible heat cooling fan coil unit or air conditioner is used as cold water having a high temperature level required for cooling and removing sensible heat in the room and exceeding the dew point temperature of the room air. 1 air conditioner.   A closed cooling tower is connected to the cooling source circuit of the high-temperature chilled water supplied to the fan coil unit or the air conditioner of claim 5 in series or in parallel, or the series / parallel switching is possible, and the outside air temperature is sufficiently low, and the air is sealed. When water temperature lower than the cooling water temperature of the fan coil unit or air conditioner outlet is obtained at the outlet of the cooling tower, the cooling by the refrigerator is reduced using this, or the required cooling can be performed even if it is stopped. The air-conditioning equipment according to claim 1.   A radial rotary impeller is installed in a state where the plane shape is square, rectangular, circular, etc., close to the top of the plate finned tube heat exchanger, with the axis vertical and the bottom open, and is directly connected to the motor. , Under the plate fin tube heat exchanger, through the air suction port and filter from the indoor ceiling surface, suck the air and pass through the plate fin tube heat exchanger to cool or heat, and rotate the radiant rotor 2. A fan coil unit installed in contact with a ceiling surface that is circulated by being circulated from a ceiling surface through a diffuser and an air outlet through a diffuser and an air outlet. Air conditioning equipment.

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