JP4557207B2 - Ventilation replacement air conditioner - Google Patents

Description

  The present invention relates to a ventilation replacement air conditioner.

  In recent years, in order to exhaust dirty air in a room without stirring, a blow outlet with a rectifying means such as a punching panel is provided on the floor side, and air is blown from the blow outlet at a low speed of about 0.5 m / s, for example. Ventilation air-conditioning is performed (Patent Document 1), and as a replacement ventilation air-conditioning device, the front surface of the waist-shaped air chamber is a porous metal panel that combines the air outlet and the radiation panel. (Patent Document 2).

    Since the air conditioning method of Patent Document 1 and the air conditioner of Patent Document 2 are designed not to stir the indoor air, an air layer that becomes hot as it moves away from the floor surface is formed, and when the temperature gradient becomes large, In order to avoid the unpleasant feeling that the head is hot and the head is hot, if the blowing speed of the conditioned air is increased, the conveyance power becomes inconvenient.

In order to eliminate the inconvenience, the present applicant provides a ventilation vent 101 for replacement ventilation on the floor side of the room as shown in FIG. 11 and also causes the cold draft to flow down from the surface of the screen-type radiant cooling panel 100 so that the upper part of the room A replacement ventilation air-conditioning system was previously filed (Japanese Patent Application No. 2003-290430) that attracts the hot air to the cooling panel and convects air to such an extent that the replacement ventilation effect is not impaired.
JP2001-4163 JP 2000-121099 JP2003-148759

    The prior application of the above-mentioned Japanese Patent Application No. 2003-290430 controls the cold draft, which was a hindrance to a comfortable air-conditioning environment in the conventional concept, and caused convection in the living space to produce the convection effect and the replacement ventilation effect. This system is a system that realizes a comfortable cooling space with a gentle temperature gradient in combination, but there is still a point to be improved as a device for that purpose.

    For example, in an office space where a large number of residents work, if the cooling panel cooling strength is increased according to the person far from the radiant cooling panel, the cold draft that flows down from the surface of the cooling panel You may reach your feet and feel cold even in summer.

    In order to prevent this, the floor draft outlet for replacement ventilation should be placed between the radiant cooling panel and the occupant so that the cold draft does not directly hit the occupant's feet. Then, it is troublesome to set and change the layout of the radiation cooling panel and the outlet for replacement ventilation, and it is also difficult to balance the radiation / convection effect and the replacement ventilation effect.

    In addition, when a radiant cooling panel is installed indoors as a cold draft generating means, if the chilled water supply pipe to the radiant cooling panel and the chilled water supply pipe to the cold air generating means are provided separately, the equipment This is expensive and expensive.

    The present applicant has intensively studied the means for solving these problems, and can form a replacement ventilation outlet in the lower front part of one device and a radiant cooling panel in the front part above the outlet. It came to think that it was the most effective as the composition of the substitution ventilation device which used the convection effect together. As a structure similar to this at first glance, for example, in an air conditioner for heating, a structure in which a blower outlet is formed in the lower part of the front surface of the casing and a radiation (radiation) panel is formed in the upper part of the front surface is known (Patent Document) 3) This is because the warm air with a small specific gravity of large air volume is blown to the floor side of the occupant's feet compared to the case of replacement ventilation air conditioning, and the hot air rises to the ceiling side to cause convection. It is not intended to generate convection by a radiant panel as proposed by the applicant.

  That is, an object of the present invention is to provide a replacement ventilation air-conditioning apparatus in order to supplement the replacement ventilation air-conditioning by generating convection and performing radiative cooling, and balancing and simplifying the replacement ventilation effect, the convection effect and the radiative cooling effect. In order to combine them, it is proposed to provide the above-mentioned air outlet at the lower part of the front of the apparatus and to form a radiant cooling panel also serving as a cold draft generating means on the front of the apparatus above the air outlet.

The first means has a box- type casing with a suction port and a blower outlet, and a blower means installed in a blower passage communicating the suction port and the blower outlet,
The air outlet, by installing a rectifying means capable of blown substantially horizontally along the Rutotomoni bed is uniform air blowing from the entire air outlet to the air flow passage portion in the vicinity of the opening surface, the whole opening surface In the replacement ventilation air conditioner as a replacement ventilation outlet that blows out air evenly and almost horizontally from
While providing the said blower outlet 12 in the casing front 6 lower part, the radiation cooling panel 14 is formed in the casing front part above a blower outlet,
The emissivity of the radiation cooling panel 14 is set to 0.1 to 0.5.

In the above configuration, the device of the present invention is sufficient if it has at least a front wall portion that forms the front surface as a guide surface of the cold draft generated from the radiant cooling panel 14 and an air passage forming member, and is not necessarily the outer surface of the device It is not necessary to have a casing that defines In addition, the “air passage” may be formed throughout the casing of the replacement ventilation device as described later, but may be a duct that connects the suction port and the air outlet. The radiant cooling panel is formed of a low emissivity material having an emissivity of 0.1 to 0.5 (more preferably, an emissivity of 0.3 to 0.5).

    Here, the “rectifying means” may be any means as long as it is used for equalizing the wind speed of the high-speed flow portion downstream of the air blowing means and the low-speed flow portion around it, for example, installed in or near the air outlet. The punching plate, the filter, or the baffle plate can be used.

The second means has the first means and cooling means 26 for cooling both the radiant cooling panel and the air in the air passage 20 on the back surface of the radiant cooling panel 14 which also serves as a cold draft generating means. Provided.

  The “cooling means” may be a heat exchanger such as a refrigerant pipe piped in parallel with the radiant cooling panel, or may be a means for generating cold with electric power such as a Beltier element.

  The cooling means can cool at least one of the radiation cooling panel and the air in the air passage to a temperature lower than the dew point (for example, 12 ° C.).

The third means includes either the first means or the second means, and the cooling means 26 cools one half of the radiant cooling panel 14 and the inside of the air passage 20 that has passed the cooling means 26. The air flow is brought into contact with the back surface of the other half of the radiant cooling panel 14, and excessive cold heat is recovered from the air flow toward the radiant cooling panel.

The fourth means includes any one of the first means to the third means, and the air outlet 10 is opened to the surface other than the front surface of the casing 2 through the rear surface side of the radiant cooling panel 14. A blower passage 20 communicating with 12 is formed inside the casing 2, and a refrigerant pipe 26 a is provided as the cooling means 26 on the back side of the radiation cooling panel 14.

  Here, the “refrigerant tube” is a tube for widely transporting a cooling medium, and can transport, for example, chlorofluorocarbon, cold water, hydrate slurry, ice slurry, and the like.

  In this configuration, the “suction port” is preferably opened at each top of the top surface 8 or the rear surface 4 to the side surface of the casing 2, so that the cold draft flows from the front surface of the casing 2 and the The outside air can be sucked from the suction port 10 without disturbing the flow of the indoor air suction to the front.

The fifth means has the fourth means, the casing 2 is a movable floor type, and has connection ports 18, 18 for connecting the refrigerant pipe 26a to an external refrigerant supply source. is doing.

The sixth means has the fourth means or the fifth means , and at least a portion of the front surface 6 of the casing 2 extending from the upper end of the radiant cooling panel 14 to the upper end of the outlet 12 is flush with the vertical plane. It is said.

  As used herein, the term “vertical plane” may be a plane that is flat enough to allow the cold draft generated by the cold heat of the radiant cooling panel 14 to flow down along the surface due to the Coanda effect. There is no need.

The seventh means includes fourth means to sixth means, and, similar to the casing front face 6, opens a replacement ventilation outlet 12 at the lower part of the rear face 4 of the casing 2, and A radiant cooling panel 14 is formed on the upper rear surface portion, a refrigerant pipe 26a is provided on the rear surface of the radiant cooling panel, and outside air sucked from the suction port 10 opened on the top surface of the casing is supplied to the front side and the rear side of the casing. The refrigerant pipes 26a are both cooled and blown out from the front and rear outlets 12 and 12.

The eighth means includes the fourth means to the seventh means, and the first flow path 20a cooled by the refrigerant pipe 26a and the uncooled first flow path in the air passage 20 in the casing 2 are provided. The two flow paths 20b are branched in parallel, and the cool air and the hot air passing through the first and second flow paths 20a and 20b are mixed and blown out from the outlet.

  As a means for partitioning the first and second flow paths 20a and 20b, for example, a partition plate 40 may be provided inside the casing 2. In addition, the first flow path that is the flow path of the cold air does not have to be a single flow path. For example, when the cooling means 26 and 26 are formed on both the front and rear sides of the casing 2 as described in the ninth means above. Two first flow paths that are cooled by the respective cooling means may be provided.

The first means has the above configuration and has the following configuration.
○ Since the air outlet 12 and the cooling panel 14 having a function of generating a cold draft are provided on the front face 6 of the replacement ventilation air conditioner, the temperature is obtained by combining the replacement ventilation effect, the radiative cooling effect, and the convection effect by using the cold draft. A comfortable air conditioning environment with a gentle slope can be realized.
○ Since the air outlet 12 is opened at the lower end portion of the front surface 6 of the apparatus and the radiant cooling panel 14 is formed in the front portion above the air outlet, the cold draft from the cooling panel is surely connected to the air blown from the air outlet 12. It is possible to prevent the blowing of cold air to the resident's feet.
O Since the air outlet 12 and the radiation cooling panel 14 are provided in one casing 2, it is not necessary to design the positional relationship between them for each air-conditioning area, and the installation of the cooling equipment is easy.
○ Since the radiant cooling panel 14 is made of a low emissivity material, the convection effect caused by the cold draft is increased by suppressing the ratio of the cooling heat supplied to the radiant cooling panel 14 that is used for the radiant effect. be able to.

According to the first means, since the rectifying means 24 for uniforming the air flow from the entire air outlet is provided in the air passage portion in the vicinity of the air outlet 12, an appropriate replacement ventilation effect can be obtained.

According to the second means, the cooling means 26 for cooling both the radiation cooling panel and the air in the air passage 20 is provided on the back surface of the radiation cooling panel 14, so that the refrigerant supply pipe and the cold air to the radiation cooling panel are provided. It is not necessary to separately connect a refrigerant supply pipe for generation, and a replacement ventilation effect, a convection effect, and a radiation effect can be obtained with a simple and inexpensive configuration.

According to the 3rd means, there exist the following effects.
○ Since the air flow that has passed through the refrigerant pipe 26a is brought into contact with the other half of the radiant cooling panel 14 and excessive cold heat is recovered to the other half of the radiant cooling panel 14, the air in the air passage is, for example, a temperature below the dew point ( For example, when the temperature is lowered to 12 ° C and the air-cooling dehumidifying effect is exhibited, the temperature of the air that has been excessively cooled after passing through the cooling means is increased to an appropriate temperature (20 to 22 ° C) as the blown air. Therefore, it is possible to supply an appropriate amount of cool air into the room.
○ Due to the temperature rise of overcooled air that has passed through the cooling means, no special heating means such as a heat heater is required, and conversely, the cold heat of the air is recovered and reused for cooling the radiant cooling panel 14 Therefore, energy efficiency is good and the running cost can be reduced.

According to the 4th means, since the ventilation path 20 which connects the suction inlet 10 and the blower outlet 12 was provided in the casing 2, and it comprised as one air conditioning unit, handling is easy.

According to the fifth means, since the casing 2 is made a movable floor type, it is easy to change the layout of the cooling equipment.

According to the sixth means, since the front part of the casing extending from the upper end of the radiant cooling panel 14 to the upper end of the blower outlet 12 is made a flush vertical plane, the cold draft is guided to the blower outlet 12 using the Coanda effect, and the blowout air High-quality air conditioning can be realized by mixing them thoroughly.

According to the seventh means, since the radiation cooling panels 14 and the air outlets 12 are provided on both the front and rear surfaces of the casing, an effective cooling effect is exerted on both the front and rear sides of the apparatus with a simple configuration.

According to the eighth means, since the cold air from the first flow path 20a and the warm air from the second flow path 20b are mixed and blown out from the blowout port 12, the temperature of the blown air from the blowout port decreases. You can avoid it.

  1 to 4 show a replacement ventilation apparatus according to a first embodiment of the present invention.

  The apparatus includes a casing 2, a blower unit 22, a rectifying unit 24, and a cooling unit 26.

  The casing 2 is a rectangular parallelepiped having a wide left and right side. The suction port 10 is opened at the upper part of the rear surface 4 of the casing, and the air outlet 12 is opened at the lower part of the front surface 6 of the casing. A radiant cooling panel 14 is formed on the front portion of the casing. An air purifying filter 16 is preferably installed at the suction port 10. The air outlet 12 is formed as a wide outlet as a replacement ventilation air conditioner air outlet, and in the left-right direction, it may be formed over almost the entire length of the left and right width of the front surface of the casing as shown in the figure. For example, the width is preferably about 20 to 30 cm. The casing 2 can be formed of a heat insulating board or the like.

    The radiant cooling panel 14 is a thermally conductive plate, and is generally formed of a high emissivity material such as a non-metal in order to enhance the radiant effect, or a metal surface is coated with a high emissivity material. However, in the case of the present invention, a glossy metal having an emissivity of about 0.3 to 0.5, such as aluminum, may be used if necessary in order to enhance the convection effect by the cold draft. Moreover, the emissivity can be reduced to about 0.1 by making the aluminum surface a well polished aluminum mirror surface.

    Further, a connection port 18 communicating with a refrigerant pipe, which will be described later, is formed at an appropriate position (side surface in the illustrated example) of the casing 2. The connection port is preferably provided detachably at the end of a refrigerant supply line from an external cold source. Furthermore, the inside of the casing 2 is formed in a blower passage 20 that allows the suction port 10 and the blowout port 12 to communicate with each other.

  The air blowing means 22 is installed in the air passage so as to be located behind the air outlet 12. However, the installation location of the blowing means can be changed as appropriate in the blowing path 20. In the illustrated example, the blowing means is a blowing fan.

    The rectifying means 24 is a punching plate fitted in the air outlet 12 and is configured such that the air velocity of the airflow blown through the punching plate is substantially uniform over the entire air outlet 12.

  The cooling means 26 is provided on the back side of the radiant cooling panel 14 as shown in FIG. 2 so as to cool both the radiant cooling panel and the air in the air passage 20.

    The cooling means in the illustrated example includes a plurality of fins 26b as heat sinks provided vertically on the back surface of the radiant cooling panel 14 and the left and right sides between the upper end and the lower end of the radiant cooling panel through the fins. Air that flows between the fins 26b, with one end of each fin 26b abutting against the back surface of the radiation cooling panel 14 and the other end protruding rearward of the refrigerant tube 26a. And radiant cooling panel 14 are configured to supply cold heat. In the illustrated example, the structure of the fin 26b is basically the same as that used for heating the radiation panel and the air in the air passage in Patent Document 3 described above. In the illustrated example, the refrigerant pipe includes a front row extending while meandering from the upper end side to the lower end side of the radiation cooling panel, and a rear row extending while meandering from the lower end side of the front row to the upper end side of the radiation cooling panel. Although formed, the refrigerant pipes may be formed in a plurality of rows of one to three or more rows.

    For example, if the room temperature is set to 26 ° C., the cooling means 26 may be configured such that the surface temperature of the radiant cooling surface is 16 to 20 ° C. and the blowing temperature is about 20 to 22 ° C. The ratio of the cold heat conducted from the cooling means 26 to the air blowing path 20 and the cold heat conducted from the cooling means to the radiant cooling panel 14 can be adjusted by, for example, the length and number of the fins 26b. It can also be adjusted by the configurations of second and third embodiments described later. The cooling means 26 can also be provided so as to be cooled below the dew point in order to dehumidify the air in the air passage 20. However, in this case, a drain pan (not shown) is provided below the refrigerant pipe 26a and the fin 26b, and a cold heat removing mechanism is provided for raising strong cold air that has passed through the cooling means to a temperature suitable as blown air. It is desirable. This mechanism will be described later.

    In the above configuration, when the air blowing means 22 is driven, warm air accumulated in the upper part of the living area is sucked into the casing 2 from the suction port 10 with the filter 16, and the air passes through the air blowing path 20 formed inside the casing. It passes through and is gradually blown out from the air outlet 12 with the rectifying means 24 to the floor side in the room. This blown air gradually pushes up the stagnant air in the room, and the air pushed up to the ceiling side is sucked into the suction port 10 and thus the room air is sequentially replaced with clean air.

  When a refrigerant is supplied from a cold source (not shown), the refrigerant cools the fins 26b and the radiation cooling panel 14 while passing through the refrigerant pipe 26a. The refrigerant pipe 26a and the fins 26b ... take heat from the airflow in contact with the surfaces thereof, and if the set temperature of the room temperature is 26 ° C, the airflow is preferably reduced to about 23 ° C from the air outlet 12 to the room. To supply. Further, the radiant cooling panel 14 produces a cold draft of about 16 ° C. The cold draft is mixed with weak cold air that flows down along the front of the panel and blows out from the outlet, and is blown into the room as an airflow of an appropriate temperature and sucks hot air in the upper part of the room toward the radiant cooling panel 14 side. Then, convection is generated supplementarily in the vicinity of the device of the present application. Further, the radiant cooling panel 14 absorbs radiant heat from a heat source existing in the room.

  Hereinafter, other embodiments of the present invention will be described. Of these embodiments, the same components as those of the present embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 5 shows a second embodiment of the present invention. In the present embodiment, for example, when the air in the air passage 20 can be cooled to the dew point temperature or less by the cooling means 26, the above-mentioned radiation is prevented in order to prevent the excessively cooled air from being blown out from the outlet. The cooling means 26 is provided only on the back surface of the upper half of the cooling panel 14 and the airflow that has passed through the cooling means is brought into contact with the back surface of the lower half of the radiant cooling panel 14 so that excess cooling heat of the airflow is radiated. It is configured to collect to the panel side. For this purpose, the air blowing means is installed in the vicinity of the lower end portion of the cooling means 26 so as to blow the air flow to the back surface of the radiation cooling panel 14. A drain pan 32 is installed below the refrigerant pipe 26a and the fins 26b of the cooling means. The drain pan 32 may be fixed to the inner surfaces of the left and right side walls of the case 2.

FIG. 6 shows a third embodiment of the present invention. This form is another form for preventing overcooling of the airflow in the air passage 20 by the cooling means 26, and a partition plate 40 parallel to the radiant cooling panel 14 is provided at an intermediate portion in the vertical direction of the air passage 20. A first flow path 20a that is vertically installed and is cooled by the cooling means 26 between the partition plate and the radiation cooling panel 14 is provided between the partition plate 40 and the rear wall of the casing 2 by the cooling means 26. The second flow paths 20b that are not cooled are formed in parallel with each other. According to this configuration, the airflow in the second flow path 20b is blocked from the cooling means 26, and the airflow in the first flow path 20a is also lower than the temperature of the heat medium of the cooling means 26. Therefore, the temperature of the mixed air of the cold air from the first flow path and the hot air from the second flow path is adjusted according to the ratio of the flow path areas S ₁ and S ₂ of the first and second flow paths. Can do. The ratio of the flow path area is as follows. The temperature of the air passing through each flow path is T ₁ and T ₂ , the blown air set temperature Ts is set, and the average flow velocity in each flow path is v ₁ and v ₂ . Then, the conditional expression (T ₂ −Ts) × v ₂ × S ₂ = (Ts−T ₁ ) × v ₁ × S ₁ is given by the following equation.
[Formula 1]

(S ₂ / S ₁ ) = (Ts−T ₁ ) × v ₁ / [(T ₂ −Ts) × v ₂ ]
The partition plate 40 is preferably formed of a heat insulating material, and both ends thereof are preferably fixed to the inner surface of the side wall of the casing.

    In the illustrated example, an air volume adjusting damper 42 for adjusting the ratio of the respective air volumes of the first flow path 20a and the second flow path 20b at the branching point of the flow path is attached, and the set temperature is increased or decreased by the damper. Accordingly, it is possible to adjust the flow rate of the second flow path 20b accordingly, in other words, to increase the flow rate in the second flow path 20b as the set temperature increases. The air volume adjusting damper 42 can be operated by a control device (not shown) or manually.

FIG. 7 shows a fourth embodiment of the present invention. In this embodiment, the radiant cooling panel 14 and the cooling means 26 are provided also on the rear surface side of the casing 2, and the suction port 10 is formed on the top surface 8 of the casing 2. In the illustrated example, two partition plates 40, 40 parallel to each radiant cooling panel are provided inside the casing 2, and a pair of first flow paths 20a are provided between each radiant cooling panel and the opposing partition plate. The second flow path 20b is formed between the partition plates 40, 40, respectively. However, the both partition plates can be omitted. Further, the radiation cooling panels 14 and the cooling means 26 on both the front and rear sides of the casing 2 may be formed symmetrically. In this embodiment, the air outlet 12 is opened only at the lower front portion of the casing 2.
Although not shown in the drawings, the present embodiment can also be provided with an air volume adjusting damper as in the third embodiment.

  FIG. 8 shows a fifth embodiment of the present invention. In this embodiment, in the apparatus of FIG. 7, the air blowing means 22 is disposed below the suction port 10 that opens to the top surface, and the suction port 10 is opened to the lower part of the front and rear surfaces 4 and 6 of the casing 2. .

  9 and 10 show an apparatus according to an embodiment of the present invention.

  The apparatus of this embodiment incorporates a so-called cooling coil as the structure of the cooling means 26 described above. This cooling coil is constructed by installing a refrigerant pipe 26a meandering left and right between left and right frame plates 34, 34 connected at four corners by frame bars 36, each refrigerant pipe 26a being located between the frame plates 26a. The straight pipe portion and the curved pipe 28 outside the frame plate are formed, and the curved pipe 28 is fitted and joined to each end of the straight pipe portion of each refrigerant pipe.

    In this embodiment, a plurality of fins 26b... Protrude from the rear surface of the radiant cooling panel 14 excluding the upper part to the rear wall side of the casing 2 as shown in FIG. The cooling coil is attached to be inclined upward and forward. For this purpose, through holes for inserting the cooling coil frame rods 36 and the straight pipe portion of the refrigerant pipe 26a are opened, and the cooling coil frame bars 36 and the refrigerant pipe 26a are directly inserted into the insertion holes. After inserting the tube portion, the left and right side plates 34, 34 may be attached to both ends of the frame bar 36, and the polar tube 28 may be attached to the straight tube portion of the refrigerant tube 26a.

    Further, a drain pan 28 is installed on the lower half side of the casing 2 so as to be positioned below the latter half of the fins 26b.

    According to the above configuration, the air sucked from the suction port 10 is cooled and dehumidified across the cooling coil and in contact with the refrigerant pipes 26a and the fins 26b, and is brought into contact with the lower back surface of the radiant cooling panel 14 to emit the radiation. After discharging an excessive amount of cold heat to the cooling panel, the cooling panel is blown out. Further, water droplets adhering to the refrigerant pipe 26a and the fins 26b are dropped into the drain pan.

1 is a front view of a replacement ventilation air conditioner according to a first embodiment of the present invention. 1 is a cross-sectional view of the device. 1 is a longitudinal sectional view of the device. 1 is a diagram showing an example of use of the device. FIG. 5 is a longitudinal sectional view of a replacement ventilation device according to a second embodiment of the present invention. It is a longitudinal cross-sectional view of the replacement ventilation apparatus which concerns on the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the replacement ventilation apparatus which concerns on the 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the replacement ventilation apparatus which concerns on the 5th Embodiment of this invention. It is a side view of the replacement ventilation apparatus which concerns on the Example of this invention. FIG. 10 is a partially cutaway perspective view of the apparatus of FIG. 9. It is a conceptual diagram of the replacement ventilation system of the prior application for which this applicant applied prior to this invention.

Explanation of symbols

2 ... Casing 4 ... Rear 6 ... Front 8 ... Top 10 ... Suction port 12 ... Air outlet
14 ... Radiant cooling panel 14 ... Filter 18 ... Connection port 20 ... Airflow path
20a ... 1st flow path 20b ... 2nd flow path 22 ... Air blowing means
24 ... rectifying means 26 ... cooling means 26a ... refrigerant pipe 26b ... fin 28 ... curved pipe
32 ... Drain pan 34 ... Frame plate 36 ... Frame rod 40 ... Partition plate 42 ... Air volume adjustment damper

Claims (8)

A box- type casing having a suction port and an air outlet, and a blowing means installed in an air passage communicating the air inlet and the air outlet,
By installing a rectifying means that can uniformly blow the air from the entire air outlet to the air passage portion in the vicinity of the opening surface of the air outlet, and that can blow out almost horizontally along the floor. In the replacement ventilation air conditioner as a replacement ventilation outlet that blows out air evenly and almost horizontally ,
While providing the said blower outlet (12) in the casing front surface ( 6 ) lower part, forming a radiation cooling panel (14) in the casing front surface part above a blower outlet,
A replacement ventilation air conditioner, wherein the radiation cooling panel (14) has an emissivity of 0.1 to 0.5.   A cooling means (26) for cooling both the radiant cooling panel and the air in the air passage (20) is provided on the back surface of the radiant cooling panel (14) that also serves as a cold draft generating means. Item 1. The replacement ventilation air conditioner according to item 1.   One half of the radiant cooling panel (14) is cooled by the cooling means (26), and the air flow in the air passage (20) that has passed through the cooling means (26) is converted into the back of the other half of the radiant cooling panel (14). The replacement ventilation air conditioner according to claim 1, wherein excessive cooling heat is recovered from the airflow toward the radiant cooling panel by contacting the airflow.   The casing (2) has an air passage (20) communicating with the blowout port (12) from the suction port (10) opening on the surface other than the front surface of the casing (2) via the back surface side of the radiation cooling panel (14). The refrigerant pipe (26a) is formed inside as a cooling means (26) on the back side of the radiation cooling panel (14), and the refrigerant pipe (26a) is provided in any one of claims 1 to 3. Replacement ventilation air conditioner.   The casing (2) is of a movable floor type and has connection ports (18, 18) for connecting the refrigerant pipe (26a) to an external refrigerant supply source. The described replacement ventilation air conditioner.   The front surface (6) of the casing (2) is characterized in that at least a portion extending from the upper end of the radiation cooling panel (14) to the upper end of the outlet (12) is a flush vertical plane. The replacement ventilation air conditioner according to claim 5.   As with the casing front surface (6), a replacement ventilation vent (12) is opened at the bottom of the casing (2) rear surface (4), and a radiant cooling panel (14) is formed at the rear surface above the vent. Then, the refrigerant pipe (26a) is piped on the rear surface of the radiation cooling panel, and the outside air sucked from the suction port (10) opened on the top surface of the casing is supplied to both the front and rear refrigerant pipes (26a). The replacement ventilation air-conditioning apparatus according to any one of claims 4 to 6, wherein the replacement ventilation air-conditioning apparatus is configured so as to be cooled at the outlet and blown out from the front and rear outlets (12, 12).   A midway portion of the air passage (20) in the casing (2) branches in parallel into a first flow path (20a) cooled by the refrigerant pipe (26a) and a second flow path (20b) not cooled. Any one of claims 4 to 7, wherein the cool air and the warm air that have passed through the first and second flow paths (20a, 20b) are mixed and blown out from the outlet. The described replacement ventilation air conditioner.