JP2012172905A - Air conditioner modification method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner modification method by which an amount of use of steam or fossil fuels can be reduced only by modifying an existing air conditioner, and the running costs of the air conditioner and CO2 emissions therefrom can be suppressed as a result.SOLUTION: The typical air conditioner modification method is for modifying an air conditioner (air conditioner 100) for treating outside air which includes at least: a preheater coil 108 using steam to heat air; steam type humidifiers 110a and 110b using steam to humidify the air; a cooling coil 112 using cold water to cool the air; and a reheat coil 114 using steam to reheat the air. The air conditioner modification method is characterized in that in addition to a cold water supply pipe 134 for supplying the cooling coil with cold water, a warm water supply pipe 234 for supplying the cooling coil with warm water is added, and a switch valve (first switch valve 202a) for alternatively communicating the cold water supply pipe or the warm water supply pipe with the cooling coil is added.

Description

  The present invention relates to a method for modifying an air conditioner for treating outside air that treats outside air and supplies it to an indoor space.

  In clean rooms and factory production lines, etc., large-scale air conditioners (air conditioners that process only the outside air and blow air are referred to as outside air conditioners) in order to maintain the temperature and humidity of the indoor space at the predetermined temperature and humidity. (Hereinafter referred to as an air conditioner). The air conditioner adjusts the temperature and humidity of the air (outside air) supplied thereto to a predetermined temperature and a predetermined humidity, and sends the adjusted air (treated air) to the indoor space. Thereby, the temperature and humidity of the indoor space are maintained at the predetermined temperature and the predetermined humidity.

  As the configuration of the air conditioner, for example, an air cooler (also referred to as a cooling coil) that cools air by circulating a cooling medium such as cold water inside, as in the air conditioner disclosed in Patent Document 1. ), A steam spraying device (also called a steam humidifier) that sprays steam to humidify the air, and an air heater (heating coil) that has coils and fins heated by steam and heats the air by them In general, a configuration including the same is also provided.

JP 7-42971 A

  In a conventional air conditioner exemplified in Patent Document 1, steam used in a steam spraying device or an air heater is generated by burning fossil fuel in a combustion engine such as a boiler. For this reason, the fossil fuel for producing | generating a vapor | steam requires huge running cost, The reduction has been a subject. In addition, from the viewpoint of effective use of energy (energy saving) and reduction of CO2 emission, which is a greenhouse gas, it is desired to reduce the amount of fossil fuel used.

  Therefore, in order to reduce the amount of fossil fuel used and the running cost required for it (that is, the running cost required for steam), it is conceivable to introduce a boilerless air conditioner. However, if an existing air conditioner or boiler is removed and a new air conditioner is introduced, enormous costs and large-scale construction will be required. .

  In view of such problems, the present invention can reduce the amount of steam used and thus the amount of fossil fuel used only by remodeling the existing air conditioner, and can suppress the running cost and CO2 emission. It aims at providing the modification method of a simple air conditioner.

  In order to solve the above problems, a typical configuration of a method for remodeling an air conditioner according to the present invention includes a preheating coil for heating air using steam in a ventilation path provided in a casing, and steam. An air conditioner for treating outside air comprising at least a steam humidifier that humidifies air using, a cooling coil that cools air using cold water, and a reheat coil that reheats air using steam In addition to the cold water supply pipe that supplies cold water to the cooling coil, a hot water supply pipe that supplies hot water to the cooling coil is added, and either the cold water supply pipe or the hot water supply pipe is selected for the cooling coil. It is characterized by adding a switching valve for communication.

  According to the said structure, it becomes possible to supply warm water to a cooling coil through warm water supply piping, and to utilize this cooling coil also as a heating coil which heats air. That is, if the switching valve switches the supply of cold water from the cold water supply pipe or the supply of hot water from the hot water supply pipe, the cooling coil provided in the existing air conditioner can be used as the cooling heating coil. Thereby, since it becomes unnecessary to operate the preheating coil and the reheating coil which were used for heating the air, supply of steam to them becomes unnecessary, and consumption of fossil fuel in the boiler can be suppressed. Therefore, it is possible to reduce the amount of steam used and thus the amount of fossil fuel used only by modifying the existing air conditioner, and it is possible to suppress the running cost and CO2 emission.

  A vaporizing humidifier that vaporizes water and humidifies the air may be installed on the rear side of the cooling coil. According to such a configuration, a vaporizing humidifier can be used in place of the vapor humidifier provided in an existing air conditioner, and supply of vapor to the vaporizing humidifier becomes unnecessary. Therefore, the consumption of fossil fuel can be further suppressed, and the above-described advantages can be obtained.

  The above air conditioner is installed in a facility that conducts annual cooling, and the facility is equipped with a heat pump type refrigerator that operates throughout the year for annual cooling, and is supplied to the cooling coil. The hot water may be cooling water that has obtained waste heat of cooling annually in the refrigerator.

  This makes it possible to effectively use heat obtained by heat exchange between the cooling water and cold water used for annual cooling, that is, heat that has conventionally been waste heat. When the cooling water (hot water) is supplied to the cooling coil, it exchanges heat with the air passing through the ventilation path of the air conditioner. Therefore, the heat of the cooling water is radiated to the air, and the temperature decreases (cools). ) Therefore, the cooling water that has obtained heat by heat exchange in the refrigerator, in other words, the equipment (cooling tower, etc.) required for cooling the cooling water whose temperature has risen becomes unnecessary, and the energy required for the operation of the equipment is eliminated. It can also be reduced.

  The refrigerator that supplies cold water to the cooling coil and the refrigerator that supplies cooling water as hot water are different devices, and the refrigerator that supplies cold water to the cooling coil is a low-temperature cold water that can dehumidify air. The refrigerator that generates water and supplies cooling water as hot water may generate weak cold water for maintaining the temperature of the indoor space.

  Cold water that is low enough to be dehumidified is only needed in the summer when it is humid. On the other hand, in facilities with high heat insulation in recent years, the temperature of the room is raised by the heat generated by the production machine, so cooling is performed throughout the year (annual cooling). Therefore, when there are a plurality of refrigerators, instead of generating low-temperature cold water (eg, 6 ° C.) that can be dehumidified by all the refrigerators, maintain the temperature of the refrigerator and the indoor space that generates low-temperature cold water (cooling) ) Divide into refrigerators that produce possible weak water. According to such a configuration, the operation of the refrigerator that generates the low-temperature cold water can be stopped during a season other than the season when the dehumidification is required among the plurality of refrigerators. Thereby, the power consumption of a heat pump can be reduced. Further, since the COP of the heat pump is improved by generating the weak cold water rather than the low-temperature cold water, energy saving can be achieved also in this respect.

  According to the present invention, an air conditioner that can reduce the amount of steam used and thus the amount of fossil fuel used can be reduced only by remodeling an existing air conditioner, and the running cost and CO2 emission can be reduced. Remodeling methods can be provided.

It is a figure which shows the structure of the air conditioner used as the application object of the remodeling method concerning this embodiment. It is a figure which shows the structure of the air conditioner to which the remodeling method concerning this embodiment was applied. It is a figure which shows the structure of the air conditioner to which the other example of the remodeling method concerning this embodiment was applied.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  Hereinafter, in order to facilitate understanding, the air conditioner remodeling method will be described after describing in detail the configuration of the air conditioner to which the air conditioner remodeling method according to the present embodiment is applied. In addition, although it demonstrates exemplifying the facility which cools annually as an object (indoor space) of the air conditioning by an air conditioner, it is not limited to this.

  FIG. 1 is a diagram illustrating a configuration of an existing air conditioner that is an application target of the remodeling method according to the present embodiment. As shown in FIG. 1, the casing 102 of the existing air conditioner 100 is formed with an outside air port 102a at the upstream end and an air supply port 102b at the downstream end. A ventilation path 102 c is formed inside the casing 102. The outside air (OA: Out side Air) supplied from the outside air port 102a to the existing air conditioner 100, that is, the temperature and humidity of the air is adjusted to a predetermined temperature and a predetermined humidity while passing through the ventilation path 102c. Thereafter, the air is supplied to the indoor space at a predetermined flow rate from the air supply port 102b as processing air, that is, supply air (SA). That is, the existing air conditioner 100 shown in FIG. 1 is an air conditioner for outside air processing.

  In the existing air conditioner 100, a pre-filter 104 is provided on the most upstream side of the ventilation path 102c. Thereby, it is possible to remove large dust particles, that is, coarse dust contained in the air supplied to the existing air conditioner 100 from the air. Further, a medium performance filter 106 that is finer than the prefilter 104 is provided on the downstream side of the prefilter 104. Thereby, the fine dust which passed the pre filter 104 can be removed from the air.

  A preheating coil 108 is provided downstream of the medium performance filter 106. The preheating coil 108 is supplied with steam from a boiler (not shown) through a steam supply pipe 108a, and heats (preheats) air using the steam as a heat source. Thereby, the temperature of the air supplied to the existing air conditioner 100 can be raised, and the humidification efficiency can be improved.

  Steam humidifiers 110a and 110b are provided downstream of the preheating coil. The steam humidifiers 110a and 110b are supplied with clean steam from a boiler (not shown) through the clean steam supply pipe 110c, and humidify air using the clean steam. Thereby, the humidity of the air supplied to the existing air conditioner 100 can be increased.

  In the above description, the steam humidifier 110a is disposed after the preheating coil 108 and before the cooling coil 112 described later, and the steam humidifier 110b is disposed after the preheating coil 108 and after the reheating coil 114 described later. It was set as the structure provided with two steam type humidifiers in total. However, the present invention is not limited to this, and may be configured to include any one of the steam humidifiers 110a or 110b.

  In the above description, steam is supplied to the preheating coil 108 and the reheating coil 114 described later, and clean steam is supplied to the steam humidifiers 110a and 110b. That is, it was assumed that the boiler supplying steam to the preheating coil 108 and the reheating coil 114 is different from the boiler supplying steam (clean steam) to the steam humidifiers 110a and 110b. However, the present invention is not limited to this, and when it is not always necessary to supply clean steam to the steam humidifiers 110a and 110b, the preheat coil 108, the reheat coil 114, and the steam humidifiers 110a and 110b are all the same. The steam may be supplied from the boiler.

  A cooling coil 112 is provided on the downstream side of the steam humidifier 110a. The cooling coil 112 cools the air using the cold water stored in the water storage tank 130. Thereby, the temperature of the air supplied to the existing air conditioner 100 can be lowered and adjusted to a predetermined temperature. Further, by reducing the temperature of the air, it is possible to perform dehumidification by reducing the saturated water vapor pressure of the air, and to adjust the humidity of the air to a predetermined humidity.

  The water storage tank 130 stores cold water generated by a first refrigerator 132 and a second refrigerator 142 that are heat pump refrigerators. Specifically, a first refrigerator 132 is connected to the water tank 130 by a first refrigerator pipe 132a and a pump 132b. Similarly, the second refrigerator 142 is connected by a second refrigerator pipe 142a and a pump 142b. The water in the water storage tank 130 is cooled in a circulating manner by the first refrigerator 132 and the second refrigerator 142.

  In addition, in this embodiment, although it was set as the structure provided with two refrigerators, this is an example and is not limited. Therefore, there may be one refrigerator or three or more refrigerators.

  The cold water stored in the water storage tank 130 is sent to the cooling coil through the cold water supply pipe 134 by using the pump 134a as power, and is used for cooling the air. The cold water (water) whose temperature has risen by being used for cooling the air returns to the water storage tank 130 through the cold water return pipe 136.

  In addition, a production system cold water supply pipe 144 is connected to the water storage tank 130, and cold water is also supplied to the equipment in the indoor space through this. Specifically, since a temperature rise occurs due to heat generated during operation of a production machine (not shown) installed in an indoor space, an apparatus (hereinafter referred to as a production cooling system 152) that cools the production machine to prevent the temperature rise. Is provided). In recent high thermal insulation facilities (indoor spaces), the temperature of the room is raised by heat generated by the production machine, so that cooling is performed throughout the year (annual cooling), and the dry coil 154 is used for the yearly cooling. Is used.

  Therefore, the cold water stored in the water storage tank 130 is also supplied to the production cooling system 152 and the dry coil 154 through the production system cold water supply pipe 144. Thereby, it is possible to suitably perform the cooling of the production system in the production cooling system 152 and the annual cooling in the dry coil 154. Then, the cold water (water) whose temperature has been increased by being used in the production cooling system 152 and the dry coil 154 is returned to the water storage tank 130.

  The first refrigerator 132 and the second refrigerator 142 are heat pump refrigerators. A refrigerant refrigeration cycle (not shown) is formed inside the first refrigerator 132 and the second refrigerator 142, and the cold water in the water storage tank 130 is a refrigerant applied to the first refrigerator 132 and the second refrigerator 142. It is cooled by indirectly exchanging heat with cooling water via

  In order to cool the cooling water whose temperature has risen by obtaining waste heat, the first refrigerator 132 is connected to a first cooling water circulation pipe 138a, a first cooling tower 138, and a pump 138b for circulating the cooling water to these. Yes. The second refrigerator 142 includes a second cooling water pipe 146a and a second cooling water return pipe 146b, and a second cooling water circulation pipe 146 through which cooling water for cooling the cold water is circulated in the second refrigerator 142. It is connected. A second cooling tower 148 and a pump 146c are provided on the second cooling water circulation pipe 146. Therefore, it is possible to circulate and use the cooling water in both the first refrigerator 132 and the second refrigerator 142.

  A reheating coil 114 is provided on the downstream side of the cooling coil 112 described above. Similarly to the preheating coil 108, the reheating coil 114 is supplied with steam from a boiler (not shown) through the steam supply pipe 108a, and heats (reheats) air using the steam as a heat source. As a result, the air whose temperature has decreased due to dehumidification in the cooling coil 112 can be reheated and adjusted to a predetermined temperature.

  As described above, the steam humidifier 110b is provided on the downstream side of the reheating coil 114, and the blower 116 is provided on the downstream side thereof. The blower 116 is air having a temperature and humidity adjusted by passing through the preheating coil 108, the steam humidifiers 110a and 110b, the cooling coil 112, and the reheating coil 114, that is, the predetermined temperature and the predetermined humidity in the existing air conditioner 100. The air (process air) thus formed is sent out to the indoor space through the air supply port 102b. A chemical filter 118 and a HEPA filter 120 are provided on the downstream side of the blower 116. Such chemical filter 118 removes chemical substances contained in the processing air, and HEPA filter 120 captures fine dust having a very small particle size contained in the processing air.

  In the above, the structure of the existing air conditioner 100 used as the application object of the remodeling method concerning this embodiment was demonstrated. As described above, in the existing air conditioner 100, the steam generated in the boiler is used in the preheating coil 108, the steam humidifiers 110a and 110b, and the reheating coil 114. For this reason, enormous running costs are required for fossil fuels to be burned in order to generate steam in the boiler, and the reduction thereof has been an issue. Further, from the viewpoint of effective use of energy (energy saving) and reduction of CO2 emission, which is a greenhouse gas, it has been desired to reduce the amount of fossil fuel used. However, if a boilerless air conditioner is introduced in order to solve these problems, the equipment cost, the existing existing air conditioner 100 and the removal cost of the boiler are enormous, and large-scale construction is required. turn into.

  Therefore, in the present embodiment, it is possible to reduce the amount of steam used and thus the amount of fossil fuel used only by remodeling the existing existing air conditioner 100, and it is possible to reduce running costs and CO2 emissions. How to remodel the air conditioner will be explained.

  FIG. 2 is a diagram illustrating a configuration of an air conditioner 200 to which the remodeling method according to the present embodiment is applied. As in the air conditioner 200 shown in FIG. 2, in the remodeling method according to the present embodiment, in the existing air conditioner 100, in addition to the cold water supply pipe 134 that supplies cold water to the cooling coil 112, hot water is supplied to the cooling coil 112. A hot water supply pipe 234 is added. The hot water supply pipe 234 is branched from the cold water return pipe 136 by the second switching valve 202b, and is connected to the cold water supply pipe 134 by the first switching valve 202a. That is, the cold water supply pipe 134 or the hot water supply pipe 234 is selectively communicated with the cooling coil 112 by the first switching valve 202a.

  A heat exchanger 236 is provided in the middle of the hot water supply pipe 234. A branch heating pipe 238 branched from the second cooling water pipe 146a is connected to the heat exchanger 236, and between the cooling water (hot water) of the second refrigerator 142 and the water flowing in the hot water supply pipe 234. Heat exchange can be performed. When the first switching valve 202a and the second switching valve 202b are controlled to form a closed loop connecting the cooling coil 112, the heat exchanger 236, and the additional pump 235, the cooling coil 112 is heated with the hot water heated by the heat exchanger 236. Can be supplied. Further, when a closed loop that connects the cooling coil 112 and the water storage tank 130 without forming the heat exchanger 236 is formed, cold water can be supplied to the cooling coil 112 as usual.

  The branch heating pipe 238 and the second cooling water pipe 146a are provided with a plurality of valves for switching between passing or bypassing the branch heating pipe 238. Thereby, the cooling water sent out from the second refrigerator 142 can be sent to the second cooling tower 148 without passing through the heat exchanger 236 except when hot water is supplied. Therefore, the pressure loss due to the cooling water passing through the heat exchanger 236 can be avoided except when the hot water is supplied, and the increase in pump power of the pump 146c can be minimized.

  Accordingly, it is possible to supply hot water to the cooling coil 112 through the hot water supply pipe 234 and use the cooling coil 112 as a heating coil for heating air. Therefore, it is not necessary to operate the preheating coil 108 and the reheating coil 114 that are conventionally used for heating the air, so that it is not necessary to supply steam to them, and consumption of fossil fuel can be suppressed.

  In particular, in this embodiment, the water flowing through the hot water supply pipe 234 is configured to be heated through the second cooling water pipe 146a and the heat exchanger 236. As a result, as the hot water supplied to the cooling coil 112, the cooling water circulating through the second cooling water pipe 146a, that is, the cooling water obtained by heat exchange with the cold water in the second refrigerator 142 can be used. . Therefore, it is possible to effectively utilize heat obtained by heat exchange with cold water, which has been conventionally regarded as waste heat. Further, when the cooling water (hot water) supplied to the cooling coil 112 heats the air passing through the ventilation path 102c (exchanges heat with the air), the temperature of the cooling water decreases as the heat is radiated to the air. (Cooled). Thereby, the load of the cooling tower 148 for cooling the cooling water of the 2nd freezer 142 can be reduced, and the energy required for the operation can be reduced.

  Further, as described above, the heat exchanger 236 is configured to receive heat from the cooling water (warm water), so that the cooling of the second refrigerator 142 is secured by the second cooling tower 148, and heat is supplied as much as necessary. It can be taken out and supplied to the cooling coil 112. Thereby, operation | movement of the 2nd refrigerator 142 and the cooling coil 112 can be made independent. The second refrigerator 142 is operated throughout the year, for example, by yearly cooling by the production cooling system 152 and the dry coil 154, whereas the cooling coil 112 that performs the outside air treatment is mainly heated only in winter. In the first place, each load is different. However, as described above, by making the thermal balance independent, it can be operated independently and freely.

  In addition, while the cleanliness of the cooling water passing through the second cooling tower 148 is relatively low, the cold water in the water storage tank 130 is also used for the production cooling system 152 and the like, so a relatively high cleanliness is required. Therefore, it is possible to prevent the cooling water and the cold water from being mixed (edge cutting) by heating the heat exchanger 236 as described above without supplying the cooling water directly to the cooling coil 112.

  In this embodiment, the hot water supply pipe 234, which is a path through which hot water flows, is connected to the existing cold water supply pipe 134 and the cold water return pipe 136. However, the present invention is not limited to this. The cooling coil 112 and the heat exchanger 236 may be connected. However, according to such a configuration, it is possible to effectively utilize the existing equipment, to minimize the addition of new piping, and to suppress an increase in equipment costs. The above configuration is also an example for the hot water supply source, and the present invention is not limited to this. Therefore, it is not always necessary to use the cooling water circulating through the second cooling water circulation pipe 146 as the hot water, and it is possible to separately provide a device for generating the hot water (preferably a heat pump type).

  Further, as a further feature of the remodeling method of the present embodiment, in the air conditioner 200, a vaporizing humidifier 210 is installed on the rear side of the cooling coil 112. The vaporizing humidifier 210 vaporizes humidifying water (water) supplied through the humidifying water supply pipe 210a to humidify the air. Strictly speaking, the vaporizing humidifier 210 is filled with an element (not shown), and the humidifying water supplied from the steam humidifier 110a is held by the element. When the air supplied to the air conditioner 200 passes through this element, the sensible heat of the air evaporates instead of the latent heat of the water, and the air is humidified.

  By providing the vaporizing humidifier 210 in this way, air can be humidified using the vaporizing humidifier 210 instead of the vapor humidifiers 110a and 110b provided in the existing air conditioner 100. Therefore, it is not necessary to supply steam to the steam humidifiers 110a and 110b, and the consumption of fossil fuel can be further suppressed. In other words, the modified air conditioner 200 does not require a boiler, and the running cost can be greatly reduced. However, since it is expensive to remove the boiler, it is preferable to backup the heat source without removing it.

  As described above, according to the remodeling method of the air conditioner according to the present embodiment, it is possible to supply hot water to the cooling coil 112 through the hot water supply pipe 234 and use the cooling coil 112 as a heating coil. . That is, the cooling coil 112 provided in the existing air conditioner 100 can be used as a cooling heating coil. This eliminates the need to operate the preheating coil 108 and the reheating coil 114, makes it unnecessary to supply steam to them, and suppresses the consumption of fossil fuel in the boiler. Further, by adding the vaporizing humidifier 210, the steam humidifiers 110a and 110b can be made unused, and similar advantages can be obtained. Therefore, only the modification of the existing air conditioner 100 can reduce the amount of steam used and thus the amount of fossil fuel used, and the running cost and CO2 emission can be suppressed.

  FIG. 3 is a diagram showing a configuration of an air conditioner 250 to which another example of the remodeling method according to the present embodiment is applied. As described above, in the air conditioner 200 illustrated in FIG. 2, the second refrigerator 142 generates cold water to be stored in the water storage tank 130 in the same manner as the first refrigerator 132.

  Here, in order to perform dehumidification, low-temperature cold water, for example, water at about 6 ° C. is required. However, in the production cooling system 152 for cooling the production machine and the dry coil 154 for directly cooling the indoor space, the low temperature is It is not necessary, for example, there is a circumstance that about 13 ° C. is sufficient. In addition to this, dehumidification is required mainly in the summer, and there is a demand for cold water at a low temperature of 6 ° C. in the winter. Conventionally, considering the simplicity of control, low-temperature cold water was generated throughout the year, and the temperature was appropriately relaxed and used.

  Therefore, in the air conditioner 250 shown in FIG. 3, the first refrigerator 132 is used as a refrigerator that generates low-temperature cold water (for example, 6 ° C.) stored in the water storage tank 130 as before, and the second refrigerator 142 is used indoors. It is used as a refrigerator that generates weak cold water (for example, 13 ° C.) in the production cooling system 152 and the dry coil 154 that are devices provided in the space.

  In the air conditioner 250, the production cooling system 152 and the dry coil 154 are connected to the second refrigerator 142 by a production system cold water supply pipe 244 through which cold water circulates. Since the temperature of the weak cold water that has returned to the second refrigerator 142 has increased, it is cooled by exchanging heat with the cooling water circulating through the cooling water circulation pipe 146. The cooling water that has obtained waste heat in the second refrigerator 142 is used as a heat source for water flowing through the hot water supply pipe 234 in the heat exchanger 236 as described above.

  On the other hand, the first refrigerator 132 may be operated as necessary. As a simple example, it is only necessary to drive in the summer when dehumidification is required. In the case of air conditioning in spring or autumn that does not require dehumidification, the cold water (not cooling water) of the second refrigerator 142 can be used.

  As described above, a plurality of refrigerators are assigned roles such as the first refrigerator 132 that supplies cold water to the cooling coil 112 and the second refrigerator 142 that supplies cooling water as a heat source of hot water. Thus, the operation of the first refrigerator 132 that generates low-temperature cold water can be stopped except during the season when dehumidification is required, and the power consumption of the refrigerator (heat pump) can be reduced. And in the 2nd freezer 142, the COP of the heat pump which is a freezer can be raised by generating the weak cold water for maintaining the temperature of indoor space instead of the cold water which can be dehumidified, and can save energy. Can be planned.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used as a method for modifying an air conditioner for treating outside air that treats outside air and supplies it to the indoor space.

DESCRIPTION OF SYMBOLS 100 ... Existing air conditioner, 102 ... Casing, 102a ... Outside air port, 102b ... Air supply port, 102c ... Ventilation path, 104 ... Pre-filter, 106 ... Medium performance filter, 108 ... Preheating coil, 108a ... Steam supply piping, 110a ... Steam humidifier, 110b ... Steam humidifier, 110c ... Clean steam supply piping, 112 ... Cooling coil, 114 ... Reheating coil, 116 ... Blower, 118 ... Chemical filter, 120 ... HEPA filter, 130 ... Water tank, 132 ... 1st refrigerator, 132a ... 1st refrigerator machine pipe, 132b ... Pump, 134 ... Cold water supply pipe, 134a ... Pump, 136 ... Cold water return pipe, 138 ... 1st cooling tower, 138a ... 1st cooling water circulation pipe, 138b ... Pump, 142 ... second refrigerator, 142a ... second refrigerator pipe, 142b ... pump, 144 ... raw System cooling water supply piping, 146 ... second cooling water circulation piping, 146a ... second cooling water piping, 146b ... second cooling water return piping, 146c ... pump, 148 ... second cooling tower, 152 ... production cooling system, 154 ... dry Coil, 200, 250 ... air conditioner, 202a ... first switching valve, 202b ... second switching valve, 210 ... vaporizing humidifier, 210a ... humidification water supply piping, 234 ... hot water supply piping, 235 ... pump, 236 ... heat Exchanger, 238 ... Branch heating piping, 244 ... Production system cold water supply piping

Claims (4)

A preheating coil that heats air using steam in a ventilation path provided in the casing, a steam humidifier that humidifies air using steam, and a cooling coil that cools air using cold water A method of remodeling an air conditioner for treating outside air comprising at least a reheating coil for reheating air using steam,
In addition to the cold water supply pipe for supplying cold water to the cooling coil, a hot water supply pipe for supplying hot water to the cooling coil is added,
A method for remodeling an air conditioner, characterized in that a switching valve for selectively communicating the cold water supply pipe or the hot water supply pipe with the cooling coil is added.   The method for remodeling an air conditioner according to claim 1, further comprising: a vaporizing humidifier that vaporizes water and humidifies air on a downstream side of the cooling coil. The air conditioner is provided in a facility that conducts annual cooling, and the facility is equipped with a heat pump type refrigerator that operates throughout the year for annual cooling,
The method for remodeling an air conditioner according to claim 1, wherein the hot water supplied to the cooling coil is cooling water that has obtained waste heat of cooling annually in the refrigerator. The refrigerator that supplies cold water to the cooling coil and the refrigerator that supplies cooling water as the hot water are different devices,
The refrigerator that supplies cold water to the cooling coil generates low-temperature cold water that can dehumidify air,
The method for remodeling an air conditioner according to claim 3, wherein the refrigerator that supplies the cooling water as the hot water generates weak cold water for maintaining the temperature of the indoor space.

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