JP2010007954A - Dehumidifying air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the structure of an apparatus, to miniaturize the apparatus, and to secure stable dehumidifying performance by limiting frost formation to a dehumidifying coil. <P>SOLUTION: This air conditioner includes: a coil train 10 including a dehumidifying coil 11 and a pair of frost coils 13a, 13b disposed longitudinally on the downstream side of the dehumidifying coil 11; and a blower 40 for forcedly causing air to flow in an air duct of the coil train 10 wherein the air to be treated passing through the air duct of the dehumidifying coil 11 is cooled to a temperature not to cause frost formation on a cooling coil and a refrigerant for dehumidification is caused to flow in the dehumidifying coil 11 in the coil train 10. Furthermore, when the air to be treated after passing through the air duct of the dehumidifying coil 11 passes through the air duct of the frost coil 13a, one frost coil 13a is frosted and a refrigerant for re-dehumidification is caused to flow, the flowing of the refrigerant to the other front coil 13b is stopped to enable defrosting operation, and the respective front coils 13a, 13b are alternately switched to operate at intervals of a designated time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dehumidifying air conditioner, and in particular, as a dehumidifying air conditioner in an environmental test room or the like that performs performance tests such as durability on various products such as automobiles and houses under various temperature and humidity conditions. The present invention relates to a dehumidifying air conditioner using a cooling and dehumidifying method.

  Conventionally, a dehumidifying air conditioner installed in an environmental test room or the like that performs performance tests such as durability on various products such as automobiles and houses under various temperature and humidity conditions is known (for example, patents) Reference 1). In such a dehumidifying air conditioner, it must be possible to accurately set and maintain the temperature and humidity conditions in the test chamber that houses the specimen.

  By the way, in the conventional environmental test chamber, the method of setting and maintaining the environmental test chamber at the required temperature and humidity conditions is to dehumidify by cooling the air to be treated to a dew point temperature (for example, −5 ° C.) or less by a cooling coil. After that, the air to be treated is heated and humidified to a required temperature and humidity by a heating device such as an electric heater or a steam heater.

In addition, even if the dew point by the cooling coil is about −5 ° C., if the temperature change due to defrosting or the like cannot be tolerated, the dew point is secured using a dry dehumidifier.
JP 2006-343238 A

  However, when the dew point cannot be ensured by performing defrosting or the like, the conventional system in which the dew point is secured by using a dry dehumidifier, the machine room for the environmental test room is narrow and the dehumidification air conditioner When a sufficient space for installing the device cannot be secured, there is a problem in that it is difficult to examine and construct the position where the device is disposed, and the workability when performing maintenance is deteriorated.

  Moreover, although the temperature of the dehumidification coil was made lower than the temperature of the cooling coil and a low dew point was made with the dehumidification coil, there was a problem that frost gradually adhered to the dehumidification coil and the dehumidification performance deteriorated.

  Therefore, the technology to be solved in order to ensure the stable dehumidifying performance by limiting the frosting on the dehumidifying coil while enabling the device structure to be simplified and miniaturized and installed in a small space. The present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a dehumidification air-conditioning apparatus using a cooling dehumidification system, wherein the dehumidification coil and the dehumidification coil are disposed downstream of the dehumidification coil. A coil array including a pair of frost coils arranged in a column, and a blower for forcibly flowing air from the upstream side to the downstream side in the air passage of each coil array. A coolant for cooling and dehumidifying the air to be treated passing through the air passage of the dehumidifying coil to a temperature at which the cooling coil does not form frost is passed through the dehumidifying coil in the above-mentioned defrosting coil, and the dehumidifying coil is disposed on one of the pair of frost coils. When the air to be treated after passing through the air passage passes through the air passage of the frost coil, a refrigerant for frosting and dehumidifying is supplied, and the flow of the refrigerant to the other frost coil is stopped. It is allowed to be able to defrosting operation in and provides a dehumidifying air-conditioning apparatus to switch the operation of the frost coils alternately at predetermined time intervals.

  According to this configuration, one of the frost coils cools to the dew point temperature or less and discharges the air to be processed A, and the other frost coil always discharges the air to be processed B that has been subjected to off-cycle defrost and finished the defrost process. Is done. In addition, at the outlet of each frost coil, the low-temperature air A that has passed through one frost coil and the high-temperature air B that has passed through the other frost coil are mixed, and the dehumidified air and defrost air are mixed. Moisture-dehumidified air (treated air) A + B is obtained, adjusted to an absolute humidity lower than the dehumidifying coil outlet humidity, and further sent downstream. Also, the operation of each frost coil is switched at a predetermined time interval, and each frost coil performs off-cycle defrost every predetermined time, so that frost formation on the dehumidifying coil and the frost coil is limited. There is very little frost. Thereby, the stable dehumidification performance can be exhibited for a long time with one dehumidifying air conditioner, and in particular, an apparatus that requires a slight dew point from 0 ° C. can be easily realized.

  The invention described in claim 2 provides a dehumidifying air conditioner in which a temperature adjusting heater is disposed on the downstream side of the frost coil.

  According to this configuration, the low temperature air A that has passed through one frost coil and the high temperature air B that has passed through the other frost coil are mixed, and the air to be processed adjusted to a predetermined humidity and temperature. (A + B) can be further heated to a predetermined temperature as necessary and sent to the downstream side.

  According to a third aspect of the present invention, there is provided a dehumidifying air conditioner having a humidity adjusting humidifier disposed downstream of the frost coil.

  According to this configuration, the low temperature air A that has passed through one frost coil and the high temperature air B that has passed through the other frost coil are mixed, and the air to be processed adjusted to a predetermined humidity and temperature. (A + B) can be further humidified to a predetermined humidity as necessary and sent downstream.

  The invention according to claim 1 performs off-cycle defrosting for each frost coil every predetermined time and restricts frost formation on the dehumidification coil and the frost coil. Therefore, frost formation in the coil array is extremely small. Therefore, it is possible to prevent a decrease in the amount of dehumidified air and deterioration of the dehumidifying performance due to the entire frost. Thereby, the stable dehumidification performance is exhibited over a long time by one dehumidifying air conditioner, and dew point operation at a minus temperature can be performed for a long time. Moreover, since it is not necessary to install a dehumidifier and a cooler separately, a dehumidification air-conditioning apparatus using a cooling and dehumidification method that is extremely miniaturized can be obtained, which contributes to a reduction in installation space. Furthermore, it contributes to the improvement of construction and maintenance.

  According to the second aspect of the present invention, since the air to be treated can be further heated to a predetermined temperature and sent to the downstream side as necessary, in addition to the effect of the invention of the first aspect, the air to be treated can be further treated. The effect of simplifying the treatment of air is expected.

  According to the invention described in claim 3, since the air to be treated can be further humidified to a predetermined humidity and sent to the downstream side as required, in addition to the effect of the invention described in claim 1 or 2, the object air can be further increased. The effect that processing of processing air can be simplified is expected.

  The present invention achieves the object of simplifying and downsizing the structure of the apparatus so that the apparatus can be installed in a small space, and restricting frost formation on the dehumidifying coil to ensure stable dehumidifying performance. Therefore, in the dehumidifying air-conditioning apparatus using the cooling and dehumidifying method, a coil array including a dehumidifying coil and a pair of frost coils arranged in tandem with the dehumidifying coil on the downstream side of the dehumidifying coil, and each coil array A blower forcibly flowing air from the upstream side to the downstream side of the air passage, and the air to be treated passing through the air passage of the dehumidifying coil is used as a cooling coil in the dehumidifying coil in the coil row A refrigerant for dehumidifying by cooling to a temperature at which frosting does not occur, and the air to be treated after passing the air passage of the dehumidifying coil to one of the pair of frost coils A refrigerant for frosting and dehumidification is allowed to flow when passing through the air path of the air duct, the flow of refrigerant to the other frost coil is stopped so that the defrosting operation can be performed, and the operation of the frost coil is predetermined. This was realized by switching alternately at the time interval.

  Hereinafter, the dehumidifying air conditioner of the present invention will be described with reference to preferred embodiments. FIG. 1 is a layout diagram showing a schematic configuration of a dehumidifying air conditioner according to the present invention. In the figure, a casing 1 is provided with an intake port 2 for taking in outside air (treated air) and an exhaust port 3 for sending treated air to be processed into an environmental test chamber (not shown).

  On the other hand, the inside of the casing 1 is partitioned into an air conditioner room 1a and a blower room 1b. A coil array 10, a temperature adjusting heater 20, and a humidity adjusting humidifier 30 are provided in the air conditioner room 1a, and a blower 40 is provided in the blower room 1b. Further, drain pans 4 and 5 are provided on the floors of the air conditioner room 1a and the blower room 1b, respectively, so that water drops generated in the casing 1 can be received by the drain pans 4 and 5 and discharged to the outside.

  In the dehumidifying air conditioner, when the blower 40 is driven, the outside air is taken into the casing 1 from the air inlet 2 as the air to be treated, and the air to be treated is arranged from the upstream side toward the downstream side. The air is exhausted from the exhaust port 3 to the outside through the air passages of the row 10, the temperature adjusting heater 20, the humidity adjusting humidifier 30, and the blower 40 in order.

  As shown in FIGS. 1 and 2, the coil array 10 includes a dehumidifying coil 11 arranged on the front stage side and frost coils 13 a and 13 b on the rear stage side arranged in tandem on the downstream side of the dehumidifying coil 11. The frost coils 13a and 13b on the rear stage side are provided in parallel with each other on the left and right sides (in some cases, up and down). Further, the air path areas of the frost coils 13 a and 13 b on the rear stage side are approximately half the size of the air path area of the dehumidifying coil 11.

  Then, the refrigerant is always supplied to the front-side dehumidification coil 11, and the refrigerant is alternately supplied to the frost coils 13a and 13b on the subsequent-stage side during the operation of the apparatus. The time is set by a timer or the like, for example. .

  Next, an operation example of the dehumidifying air conditioner will be described. As described above, when the present apparatus is operated, the refrigerant is always flown through the dehumidifying coil 11 on the front stage side, and the temperature at which the air to be processed passing through the air passage of the dehumidifying coil 11 does not frost on the dehumidifying coil 11. (For example, the evaporation temperature is 0 ° C. or the brine inlet temperature is 0 ° C. so that the air to be treated is 0 to 5 ° C.) and the air to be treated is dehumidified.

  On the other hand, on the rear stage side, the refrigerant flows only through the frost coil 13a on one side, and the refrigerant to the frost coil 13b stops. As a result, on the frost coil 13a side, when the air to be treated that has passed through the air passage of the dehumidifying coil 11 passes through the air passage of the frost coil 13a, 0 ° C. or less (for example, −15 C.) and frosted, and dehumidified with the frost. On the other hand, an off-cycle defrost state is created on the frost coil 13b side where the refrigerant does not flow.

  That is, in this dehumidifying air-conditioning operation, the air to be treated that flows to the blower suction side through the dehumidifying coil 11 and the frost coil 13a by the flow of air generated by the blower 40 is dehumidified by the dehumidifying coil 11 and the frost coil 13a. And cooled to -15 ° C. On the other hand, the air to be treated that flows through the dehumidifying coil 11 and the frost coil 13b to the blower suction side is dehumidified by the dehumidifying coil 11 and cooled to 5 ° C. The air to be treated that has passed through the frost coils 13a and 13b on the rear stage side is mixed with each other to reach a predetermined dew point temperature (for example, −2 ° C.), and further, a temperature adjusting heater 20 and a humidity adjusting humidifier. 30 and the blower 40 are sequentially discharged from the exhaust port 3.

  When the time set in advance by the timer elapses, the refrigerant to the frost coil 13a on one side is stopped and the refrigerant is allowed to flow only to the frost coil 13b on the reverse side, contrary to the previous one. As a result, on the frost coil 13b side, when the air to be treated that has passed through the air passage of the dehumidifying coil 11 passes through the air passage of the frost coil 13b, 0 ° C. or less (for example, −15 C.) and frosted, and dehumidified with the frost. On the other hand, an off-cycle defrost state is created on the frost coil 13a side where the refrigerant does not flow.

  That is, in this dehumidifying air-conditioning operation, the air to be treated that flows to the exhaust port 3 side through the dehumidifying coil 11 and the frost coil 13b by the flow of air generated by the blower 40 is dehumidified by the dehumidifying coil 11 and the frost coil 13b. And cooled to -15 ° C. On the other hand, the air to be treated that flows through the dehumidifying coil 11 and the frost coil 13a to the blower suction side is dehumidified by the dehumidifying coil 11 and cooled to 5 ° C. The air to be treated that has passed through the frost coils 13a and 13b on the rear stage side is mixed with each other to reach a predetermined dew point temperature (for example, −2 ° C.), and further, a temperature adjusting heater 20 and a humidity adjusting humidifier. 30 and the blower 40 are sequentially discharged from the exhaust port 3.

  Therefore, in the dehumidifying air conditioner of the present embodiment, the switching of the operation mode is repeated every predetermined time, and the coil array 10 is subjected to offside defrosting every time the predetermined time set by the timer elapses. The frost formation on the frost coils 13a and 13b is limited, and the frost formation on the coil array 10 is extremely reduced. Thereby, the stable dehumidification performance is exhibited over a long time with one dehumidifying air conditioner, and dew point operation at a minus temperature for a long time is possible. In addition, it is not necessary to install a dehumidifier and a cooler separately, and a dehumidifying air-conditioning system using a cooling and dehumidification method that is extremely miniaturized can be obtained, contributing to a reduction in installation space and ease of installation and maintenance. It will also contribute to the improvement.

  Further, the air to be treated which is adjusted by mixing the low temperature air A passing through one frost coil 13a (or 13b) and the high temperature air B passing through the other frost coil 13b (or 13a). When the temperature of (A + B) is equal to or lower than the desired temperature, the temperature adjustment heater 20 is heated to heat the air to be treated (A + B), so that the desired temperature can be easily adjusted.

  Furthermore, the air to be treated which is adjusted by mixing the low temperature air to be treated A passing through one frost coil 13a (or 13b) and the high temperature air to be treated B passing through the other frost coil 13b (or 13a). When the humidity of (A + B) is equal to or lower than the desired humidity, it can be easily adjusted to the desired humidity by blowing the mist from the humidity adjusting humidifier 30 and humidifying the air to be treated (A + B). It is also possible to simultaneously adjust the humidification and the heating by operating the temperature adjustment heater 20 and the humidity adjustment humidifier 30 simultaneously.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The layout which shows schematic structure of the dehumidification air-conditioning apparatus which concerns on this invention. The perspective view which shows an example of an air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 1a Air-conditioner room 1b Blower room 2 Intake port 3 Exhaust port 4 Drain pan 5 Drain pan 10 Coil row 11 Dehumidification coil 13a Frost coil 13b Frost coil 20 Temperature adjustment heater 30 Humidity adjustment humidifier 40

Claims (3)

In dehumidification air conditioner by cooling dehumidification
A coil array comprising a dehumidification coil and a pair of frost coils arranged in tandem with the dehumidification coil on the downstream side of the dehumidification coil, and the air path of each coil array from the upstream side toward the downstream side While equipped with a blower that forcibly flows air,
A coolant for cooling and dehumidifying the air to be treated passing through the air passage of the dehumidifying coil to a temperature at which the cooling coil does not form frost is supplied to the dehumidifying coil in the coil array, and the one of the pair of frost coils When the air to be treated after passing through the air passage of the dehumidifying coil passes through the air passage of the frost coil, a refrigerant for frosting and dehumidifying is flown, and the flow of the refrigerant to the other frost coil is stopped. To allow defrosting operation,
And the dehumidification air conditioner which changed the operation | movement of the frost coil alternately by the predetermined time interval.   2. A dehumidifying air conditioner according to claim 1, wherein a heater for adjusting the temperature is disposed downstream of the frost coil. The dehumidifying air conditioner according to claim 1 or 2, wherein a humidity adjusting humidifier is disposed downstream of the frost coil.

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