JP2015038395A - Outside air treatment air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy-saving, cost-saving and space-saving outside air treatment air conditioner.SOLUTION: A forward wind passage 11 and a backward wind passage 12 are provided in parallel in a housing 1. In the casing 1, the exit part of the forward wind passage 11 and the entry part of the backward wind passage 12 are communicated and connected at a folding wind passage 13 to form an air feeding passage 3. A steam type humidifier emitting steam for humidification is included. A heat exchange coil 4 is provided in at least the forward wind passage 11 of the forward wind passage 11 and the backward wind passage 12 of the housing 1. On the leeward side of the heat exchange coil 4 of the forward wind passage 11, steam for humidification is emitted.

Description

  The present invention relates to an outside air processing air conditioner.

  There is an outside air processing air conditioner in which an air passage and a plurality of heat exchange coils are provided in a casing, outside air is passed through the heat exchange coil, and temperature and humidity are adjusted in a plurality of stages to supply air indoors. In such a special outside air processing air conditioner, since many heat exchange coils are arranged in the blowing direction, the outside air processing air conditioner becomes long, and there is a problem that it can not be installed unless there is a large space, and there is a problem that equipment cost is taken, Space saving and cost saving were required.

JP 2012-172905 A

  In addition, it is stipulated that outside air is taken into a building having a predetermined total area or more so that the indoor carbon dioxide (CO2) concentration is 1000 ppm or less. Therefore, air conditioning systems such as buildings adjust the temperature and humidity of indoor air by adjusting the temperature and humidity of indoor air with a coil for heat exchange, and adjust the temperature and humidity of outside air with a coil for heat exchange and a humidifier. And an outside air processing air conditioner to be supplied. In such an air conditioning system, the capacity of the air conditioner and the external air conditioner is set and controlled in accordance with the indoor design maximum load, and the wasteful energy consumption increases.

  In order to solve the above-mentioned problems, the present invention provides a forward air passage and a return air passage in parallel in the casing, and the outlet portion of the forward air passage and the inlet portion of the return air passage are turned into the return air passage in the casing. The most important feature is that the air passage is formed by connecting the air and the heat exchange coil is provided in the air passage.

  According to the first aspect of the present invention, it is possible to provide a large number of coils for heat exchange without making the casing long by folding and lengthening the air passage, thereby reducing the space and cost of the outside air treatment air conditioner. Can be planned. In addition, since the air supply path is configured so that the air for supply is turned back halfway, the noise energy is reflected / diffused and attenuated, thereby enabling low noise operation.

  According to the second aspect of the present invention, it is possible to lengthen the evaporation and absorption distance of the steam humidification by using the folded air passage as the humidification space. Therefore, the humidification efficiency is good and the saturation efficiency can be increased, the humidity control range is expanded, the comfort is improved, and the outside air processing air conditioner can be prevented from being enlarged. Steam humidification improves indoor temperature and humidity control accuracy

  According to the invention of claim 3, the folded air passage can be used also as an inspection space, and the maintainability of the heat exchange coil and the humidifier is improved.

  According to the invention of claim 4, since it is an elliptical tube, there is little pressure loss, the effective length of the heat transfer tube can be increased without increasing the blowing power, and when the heat exchange coil is a cold / hot water coil, a large temperature difference, Pump power can be greatly reduced by reducing the amount of water.

  According to the inventions of claims 5 and 6, since the outside air and the return air are mixed and heat exchanged, when the air conditioning load is small such as an intermediate period, the outside air treatment and the return air treatment can be performed by the outside air treatment air conditioner alone. Energy saving is achieved because indoor dedicated air conditioners other than the outside air treatment air conditioner can be stopped or intermittently operated. When the outside air load is large, if the concentration of carbon dioxide decreases due to a decrease in the number of people in the room, the amount of outside air can be reduced to reduce the air conditioning energy consumption.

  According to the sixth aspect of the present invention, when the air conditioning load is small, the minimum air conditioning capacity is excessive and the indoor return temperature humidity becomes too lower than the set return temperature humidity during cooling, or the indoor return temperature during heating. It is possible to prevent the humidity from rising too much above the set return temperature humidity by reducing the supply air volume, improving comfort.

  FIG. 1 shows an embodiment of an outside air processing air conditioner according to the present invention. This outside air processing air conditioner includes a casing 1, an air volume adjusting mechanism D, a variable air volume mechanism E, and a control device 2. ing. In the casing 1, at least an air passage 3, a heat exchange coil 4, an air supply fan 5, a filter 6, and a humidification nozzle 7 of a steam humidifier that discharges steam for humidification are provided. In the casing 1, the forward air passage 11 and the return air passage 12 are provided in parallel, and in the casing 1, the outlet portion of the forward air passage 11 and the inlet portion of the return air passage 12 are connected in communication with each other by a folded air passage 13. A substantially U-shaped air passage 3 is formed, and a heat exchange coil 4 is provided in the air passage 3. The heat exchanging coil 4 is formed by inserting heat transfer tubes into a large number of heat transfer plates provided so as to be freely ventilated (not shown), and the heat medium or refrigerant flowing through the heat transfer tubes and the passing air are transferred to the heat transfer tubes and the heat transfer tubes. Heat exchange through the plate. The heat transfer tube is preferably an elliptical tube, but may be a circular tube.

  The casing 1 is provided with an air intake port 8, an air supply port 9, and an inspection door 10 that allows the inside of the folded air passage 13 to be inspected from the outside of the casing 1, and the air intake port 8 and the air supply port 9 are provided. The air passage 3 is connected in communication. The heat exchange coil 4 is provided in at least the forward passage 11 of the forward passage 11 and the return passage 12 in the casing 1. A humidifying nozzle 7 is provided on the air outlet side of the heat exchange coil 4 in the forward air passage 11 so as to release humidification steam under the heat exchange coil 4 in the forward air passage 11. Steam is absorbed in both spaces of the path 11 and the folded air path 13 to humidify the supply air. In addition, as a steam type humidifier, it can change to various things, such as a well-known electrode type, an electrothermal type, and a vapor | steam spraying type, or can also make a humidifier into a vaporization type. In the illustrated example, the case where only the humidifying nozzle 7 is arranged in the casing 1 is illustrated, but a device such as a steam generator for supplying steam to the humidifying nozzle 7 may be provided in the casing 1. Further, although the heat exchange coils 4 are respectively provided in the forward air passage 11 and the return air passage 12, the number and arrangement of the heat exchange coils 4 can be freely changed.

  The air supply fan 5 is provided in the air blowing path 3 leeward of the heat exchange coil 4 in the return air path 12 and blows air in a suction manner. The fan 5 is provided with a variable air volume mechanism E composed of an inverter or the like that can adjust the supply air volume of the air passing through the coil for heat exchange. The solid white arrows indicate the blowing direction, and the air sucked by the fan 5 passes through the heat exchange coil 4 and is heat-exchanged, and is supplied from the air supply port 9 as cold air or warm air. An air volume adjusting mechanism D that introduces outside air from the outside and return air from the inside as the supply air into the air passage 3 so that the mixing ratio can be adjusted freely. The proportional outside air damper 18 and the return air damper 19 that can adjust the air volume are provided. Provide and configure.

  The control device 2 includes a sensor, a microprocessor, and the like, and detects the temperature and humidity of the return air temperature / humidity detector 14 that detects the temperature and humidity of the return air (indoor) and the heat exchange coil passage air (supply air). A temperature and humidity detector 15, a CO 2 detector 16 that detects the carbon dioxide concentration in the return air (indoor), and setting means 17 are provided. The setting means 17 sets each of the set supply air temperature of the heat exchange coil passing air, the indoor set return temperature humidity, and the indoor carbon dioxide set concentration. These set values may be a single numerical value or a numerical value within a predetermined range including a threshold value, and any of them can be selected freely.

  When the indoor air conditioning load exceeds the minimum air conditioning capacity, the control device 2 changes the mixing ratio of the supply air by the air volume adjustment mechanism D so that the supply air volume becomes constant, thereby adjusting the indoor carbon dioxide concentration. When the indoor air conditioning load is lower than the minimum air conditioning capacity while maintaining the set concentration, the air volume adjustment mechanism D maintains the indoor carbon dioxide concentration at the set concentration while reducing the supply air volume.

  In the cooling operation of the supply air, the supply air temperature / humidity detector while controlling the mixing ratio of the supply air by the air volume adjusting mechanism D so that the indoor carbon dioxide concentration detected by the CO2 detector 16 becomes a set concentration. Coil heat exchange capacity adjustment mechanism (not shown) so that the supply air temperature of the heat exchange coil passing air detected at 15 becomes the set supply air temperature (heat pump compressor capacity control mechanism, cold / hot water coil flow adjustment mechanism, etc.) Control the air conditioning capacity. For example, if the carbon dioxide concentration becomes lower than the set concentration due to the increase or decrease in the number of people in the room, the outside air ratio of the supply air is reduced by the outside air damper 18 and the return air damper 19 to increase the carbon dioxide concentration, and the carbon dioxide concentration is higher than the set concentration. When the carbon concentration increases, the outside air damper 18 and the return air damper 19 control to increase the outside air ratio of the supply air to lower the carbon dioxide concentration, and when the supply air temperature becomes lower than the set supply air temperature, the supply air When the temperature is increased and the supply air temperature becomes higher than the set supply air temperature, the supply air temperature is controlled to be lowered. When the return air temperature humidity detected by the return air temperature / humidity detector 14 is lower than the set return air temperature / humidity in the cooling operation with the minimum air conditioning capacity, the variable air flow mechanism E reduces the supply air volume and raises the return air temperature / humidity. While controlling the temperature and humidity, the air volume adjustment mechanism D controls the carbon dioxide concentration not to exceed the set concentration as described above.

  Similarly, in the heating operation of the supply air, the air supply adjustment mechanism D controls the mixing ratio of the supply air so that the indoor carbon dioxide concentration detected by the CO2 detector 16 becomes the set concentration, and the supply air temperature humidity The air conditioning capability is controlled so that the supply air temperature of the heat exchange coil passing air detected by the detector 15 becomes the set supply air temperature. For example, when the carbon dioxide concentration is lowered, the outside air ratio of the supply air is reduced by the outside air damper 18 and the return air damper 19 to increase the carbon dioxide concentration, and when the carbon dioxide concentration is higher than the set concentration, the outside air damper 18 and the returning air. The damper 19 is controlled to increase the outside air ratio of the supply air to lower the carbon dioxide concentration, and when the supply air temperature becomes lower than the set supply air temperature, the supply air temperature is increased and is set to be higher than the set supply air temperature. Control is performed to lower the supply air temperature when the supply air temperature increases. When the return air temperature humidity detected by the return air temperature / humidity detector 14 exceeds the set return air temperature / humidity in the case of heating operation with the minimum air conditioning capacity, the variable air flow mechanism E reduces the supply air volume and lowers the return air temperature / humidity. While controlling the temperature and humidity, the air volume adjustment mechanism D controls the carbon dioxide concentration not to exceed the set concentration as described above.

  In addition, this invention is not limited to the above-mentioned Example, A design change is free in the range which does not deviate from the summary of this invention, for example, the coil 4 for heat exchange is free to change to a cold / hot water system, a heat pump system, etc. . Also, it has only a function of maintaining the indoor carbon dioxide concentration at a set concentration by changing the mixing ratio of the supply air by the air flow adjustment mechanism D so that the supply air amount of the air passing through the heat exchange coil is constant. The control device 2 can be freely used.

It is a simplified explanatory view showing the entire configuration of the outside air processing air conditioner of the present invention.

DESCRIPTION OF SYMBOLS 1 Casing 2 Control apparatus 3 Air supply path 4 Coil for heat exchange 10 Inspection door 11 Outward path 12 Return path 13 Folding path D Air volume adjustment mechanism E Air volume change mechanism

Claims (6)

  A forward air passage (11) and a return air passage (12) are provided in parallel in the casing (1), and an outlet portion of the outward air passage (11) and the return air passage (12) in the casing (1). The air inlet air conditioning air conditioner is characterized in that the air inlet (13) is connected in communication with a folded air passage (13) to form a blower passage (3), and a heat exchange coil (4) is provided in the blower passage (3). Machine.   A steam type humidifier that discharges steam for humidification is provided, and a heat exchange coil is provided in at least the forward path (11) of the forward path (11) and the return path (12) in the casing (1). The outside air-conditioning air conditioner according to claim 1, wherein (4) is provided, and humidifying steam is released downwind of the heat exchange coil (4) in the forward passage (11).   The outside air-conditioning air conditioner according to claim 1 or 2, wherein an inspection door (10) is provided in the casing (1) so that the inside of the folded air passage (13) can be inspected from outside.   The outside air processing air conditioner according to claim 1, 2, or 3, wherein the heat transfer tube of the heat exchange coil (4) is an elliptic tube.   Air volume adjustment mechanism (D) that introduces outside air from the outside and return air from the inside as air supply air into the air flow path (3) so that the mixing ratio can be freely adjusted, and the supply air volume of the air passing through the heat exchange coil is constant. And a control device (2) for maintaining the indoor carbon dioxide concentration at a set concentration by changing a mixing ratio of the supply air by the air volume adjusting mechanism (D). 2. The outside air processing air conditioner according to 2, 3 or 4.   The air volume adjustment mechanism (D) that introduces outside air from the outside and the return air from the inside as the supply air to the air flow path (3) with adjustable mixing ratio, and adjusts the supply air volume of the air passing through the heat exchange coil When the indoor air conditioning load exceeds the minimum air conditioning capacity, the air volume adjusting mechanism (D) mixes the supply air with a variable air flow mechanism (E) so that the supply air volume is constant. When the indoor air conditioning load is lower than the minimum air conditioning capacity, the air volume adjustment is performed while the supply air volume is reduced by the variable air volume mechanism (E). The outside air-conditioning air conditioner according to claim 1, 2, 3, or 4, further comprising: a control device (2) that maintains the indoor carbon dioxide concentration at a set concentration by a mechanism (D).

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