JP6894961B2 - Pneumatic radiant air conditioner - Google Patents

Description

The present invention relates to a pneumatic radiant air conditioner.

The pneumatic radiant air conditioner disclosed in Japanese Patent Application Laid-Open No. 2011-14405 has an air supply unit provided so that air cooled or heated by a heat exchanger is ejected, and an action of attracting the jet air emitted from the air supply unit. The mixed air of the air attracting part provided so as to draw in the air of the air-conditioned space, the jet air of the air supply part, and the attracted air of the air attracting part is discharged to the air-conditioned space, and the heat of the mixed air is discharged to the air-conditioned space. It is provided with an air mixing section provided so as to radiate into the space. The radiant action and attracted reheat action generated by this structure can provide comfortable air conditioning without draft feeling and temperature unevenness, but the structure is complicated and the cost is high, so the attracted reheat function is omitted and the blowout exceeds the dew point temperature. We examined a simple pneumatic radiant air conditioner that can cool at temperature.

Japanese Unexamined Patent Publication No. 2011-14405

The pneumatic radiation air conditioner is provided with a heat exchanger that exchanges heat between the air for air conditioning and the heat exchange medium, and the heat transfer tube group of the heat exchanger is divided into two groups to equalize the heat exchange medium. The structure was such that the lower limit flow rate was reduced to widen the lower limit capacity control range of the heat exchanger. However, since the heat transfer tube group is divided into equal parts, the lower limit flow rate of the heat exchange medium is limited, and in the case of a low air conditioning load where a small amount of heat exchange (through heat amount) is sufficient, the capacity becomes excessive and it is overcooled or overheated. There was a problem that comfort was impaired.

In order to solve the above problems, the present invention includes a radiation unit that radiates the heat of the air conditioning air while discharging the air conditioning air to the space to be air-conditioned, and a heat exchanger that exchanges heat between the air conditioning air and the heat exchange medium. A fan for sending the air conditioning air to the radiation unit is provided, and the heat exchanger distributes a group of heat transfer tubes through which the heat exchange medium flows to a plurality of groups and partially or all the heat of the group. The control is provided with distribution circuits distributed so that the ratio of the limit flow rate of the exchange medium is different, and the flow rate of the heat exchange medium is increased or decreased in the first group of the minimum limit flow rate of the distribution circuit in the case of a low air conditioning load. The most important feature is that it is equipped with a device.

According to the invention of claim 1, in the case of a low air conditioning load, the flow rate of the heat exchange medium can be increased or decreased in the first group of the minimum limit flow rate to further minimize the lower limit flow rate. Therefore, the lower limit capacity control range of the heat exchanger is widened, and even in the case of a low air-conditioning load, the capacity is not excessive, energy wasting, overcooling and overheating are eliminated, and energy saving and comfort are improved.
Even when the heat exchange medium is cold / hot water and the air conditioning load is low, the temperature difference of the cold / hot water can be controlled to be constant, so the air conditioner can be operated with a small amount of water and a large temperature difference. It is possible to save energy in the heat source machine by making the temperature difference.

Further, during cooling, the heat exchange medium is circulated to the first group so as not to be circulated to the second group, and the supercooled dehumidified air that has passed through the first group is discharged from the supercooled dehumidified air that has passed through the non-overlapping zone. It can be reheated with high temperature bypass air to obtain dry air without an unpleasant feeling of coldness. At this time, since the supercooled dehumidified air is sandwiched between the bypass airs so as not to escape, mixing is promoted and reheating can be reliably performed. Therefore, even in the middle period when the humidity is high and it gets damp, air conditioning can be performed with a crisp air flow without cold draft, and comfort is improved. Moreover, equipment such as a bypass damper is not required, and cost reduction and compactness can be achieved.

According to the invention of claim 2 , the dead water region of the heat transfer tube group is reduced, the ventilation resistance of the heat transfer tube group is small, energy saving is achieved, the contact area with air conditioning air (through heat amount) is increased, and the heat exchange efficiency is improved. To do. Therefore, when the heat exchange medium is cold / hot water, it is possible to operate with a small amount of water and a large temperature difference without increasing (increasing the size) the heat transfer area of the heat exchanger.
According to the invention of claim 3 , since the air conditioner integrates the heat exchanger, the fan and the radiation unit, it is easy to manufacture and construct and the cost can be reduced. The heat storage unit can be used for both heat storage and rectification of air conditioning air, improving heat radiation capacity and enabling comfortable air conditioning without uneven air volume and temperature.

It is a bottom side perspective view of the pneumatic radiant air conditioner of this invention. It is a bottom view of the pneumatic radiant air conditioner shown in FIG. FIG. 2 is a sectional view taken along the line AA of the pneumatic radiant air conditioner shown in FIG. It is a BB cross-sectional view of the pneumatic radiant air conditioner shown in FIG. It is a perspective view which shows the heat exchanger. It is a simplified explanatory view of the arrow D arrow of FIG. It is a simplified explanatory view of E arrow view of FIG.

1 to 7 show an embodiment of the pneumatic radiant air conditioner of the present invention. This pneumatic radiation air conditioner exchanges heat between the radiation unit 1 that radiates the heat of the air conditioning air while discharging the air conditioning air to the air-conditioned space S and the outside air, the return air, or a mixed air thereof as the air conditioning air. It includes a exchanger 2, a fan 3 that sends air conditioning air to the radiation unit 1, a drain pan 4, a casing 5, and a control device 6. A radiant air conditioner is installed on the ceiling or the like of the air-conditioned space S with the bottom surface of the radiant unit 1 facing the air-conditioned space S. The thick dotted arrow in each figure indicates the direction of air conditioning air flow.

The radiation unit 1 includes a chamber portion 12 through which air for air conditioning flows, a group of through holes 7 formed at the bottom of the chamber portion 12, and a heat storage portion 8 provided in the chamber portion 12. The heat storage unit 8 is arranged with a gap through which the air-conditioning air passes, and at the same time, the air-conditioning air is circulated and diffused in a rectified manner to be discharged from the through hole 7 to the air-conditioned space S, and the heat of the air-conditioning air is discharged. A group of heat transfer plates 9 that are stored and radiated from the through hole 7 to the air-conditioned space S is provided. The heat of the air conditioning air is transferred to the group of heat transfer plates 9, and is radiated from the group of heat transfer plates 9 to the air-conditioned space S through the group of through holes 7.

The radiation unit 1, the heat exchanger 2, and the fan 3 are provided inside the casing 5. The casing 5 has a return air inlet portion 10 that takes in air (return air) of the air-conditioned space S through a ceiling chamber T, a duct (not shown), and an outside air inlet portion 11 that takes in outside air. There is. The outside air intake 11 is connected to the outside via a duct 23.

As the heat exchanger 2, a structure for exchanging heat of air for air conditioning with a heat exchange medium of cold water or hot water, a structure for exchanging heat for air for air conditioning with a heat exchange medium of a refrigerant such as Freon, and other structures can be used. However, in the figure example, a structure in which heat exchange of air for air conditioning with cold water or hot water is illustrated. The heat exchanger 2 cools or heats the air conditioning air by exchanging heat between the air conditioning air and the heat exchange medium. The heat exchanger 2 includes a fin group 13 and a flow dividing circuit 14. The fin group 13 is composed of a large number of plate fins 15 arranged with a gap through which air conditioning air passes.

The flow dividing circuit 14 distributes the heat transfer tube group 16 through which the heat exchange medium flows to a plurality of groups G and distributes the heat exchange media of some or all of the group G so that the ratio of the limit flow rate (heat exchange amount) is different. To configure. For example, the first group G (G1) having a single and minimum limit flow rate shown by the thick alternate long and short dash line in FIG. 6 and the limit flow rate shown by the thin alternate long and short dash line in FIG. 6 excluding the first group (G1) are the first group (G1). It is divided into a second group G (G2), which has more than G1). The heat transfer tube group 16 is connected to the fin group 13 by meandering so as to cross the air flow direction of the air conditioning air. The straight tube portion of the heat transfer tube group 16 is preferably formed of an elliptical tube, but may be a circular tube.

The heat exchange medium inlet of the first group G1 is connected to the first branch header 17, and the heat exchange medium inlet of the second group G2 is connected to the second branch header 17. Both the heat exchange medium outlets of the first group G1 and the second group G2 are connected to the merging header 18. The branch header 17 is connected to the outgoing pipe 20 via a valve 19, and the merging header 18 is connected to the return pipe 21. Cold water or hot water, which is a heat exchange medium, flows through the forward pipe 20 and the return pipe 21, and the temperature is adjusted by a heat source machine such as a chiller or a boiler (not shown). The flow dividing circuit 14 extends toward the airflow direction while meandering so that the heat transfer tube group 16 crosses the airflow direction of the air passing through the heat exchanger 2, and when viewed from the airflow direction, the second group A non-overlapping zone F in which G2 and the first group G1 do not overlap and only the second group G2 is included, and an overlapping zone in which the second group G2 and the first group G1 overlap are formed in a laminated manner and are overlapping zones. Is configured to be sandwiched between non-overlapping zones F. The control device 6 controls the valve 19 so that, for example, during cooling, the heat exchange medium is circulated to the first group G1 of the flow dividing circuit 14 of the heat exchanger 2 and not to the second group G2.

The control device 6 air-conditions in the heat exchanger 2 from the valve 19 for adjusting the flow rate of the heat exchange medium, the controller 22, the temperature of the heat exchange medium entering the branch header 17, and the temperature of the heat exchange medium exiting the merging header 18. It is provided with a temperature difference detection unit (not shown) that detects the temperature difference of the heat exchange medium caused by heat exchange with the air. Valve 19 is a proportional control valve that can adjust the flow rate (valve opening degree) steplessly, you adjust the separate flow provided for each group G of the shunt circuit 14. In the case of a low air conditioning load, the controller 22 increases or decreases the flow rate of the heat exchange medium only in the first group G1 of the minimum limit flow rate of the flow dividing circuit 14, and at the valve 19 so that the temperature difference of the heat exchange medium becomes constant. Control the flow rate.

Further, the controller 22 controls the temperature difference of the heat exchange medium to be constant by increasing or decreasing the flow rate of the heat exchange medium in all groups G, for example, in the case of a high air conditioning load, and between the high air conditioning load and the low air conditioning load range. In the case of the normal air conditioning load, the flow rate of the heat exchange medium is increased or decreased in the second group G2 to control the temperature difference of the heat exchange medium to be constant. As a result, there are a wide range of air-conditioning loads, from high air-conditioning loads that require the maximum amount of heat exchange, such as midsummer and midwinter, to low-air-conditioning loads that require a small amount of heat exchange, such as in the middle period. Can handle large temperature difference operation with a large amount of water.

The present invention is not limited to the above-mentioned examples. In the illustrated example, the group G of the shunt circuit 14 is distributed to two groups G1 and G2, but it is also free to distribute the group G to three or more groups G and set one group G as the minimum limit flow rate.

1 Radiation unit 2 Heat exchanger 3 Fan 6 Control device 7 Through hole 8 Heat storage unit 9 Heat transfer plate 14 Divergence circuit 16 Heat transfer tube group F Non-overlapping zone G Group S Air-conditioned space

Claims (3)

A heat exchanger that exchanges heat between the radiation unit (1) that radiates the heat of the air-conditioning air while discharging the air-conditioning air to the air-conditioned space (S) and the heat exchange medium of the cold water or hot water. 2) and a fan (3) for sending the air conditioning air to the radiation unit (1).
The heat exchanger (2) includes a flow dividing circuit (14) that distributes the heat transfer tube group (16) through which the heat exchange medium flows to a plurality of groups (G) and has different distribution ratios. ,
The flow rate of the heat exchange medium of the first group (G1) having the minimum distribution ratio of the diversion circuit (14) and the second group (G2) of the diversion circuit (14) excluding the first group (G1). ) Is provided with a valve (19) that separately adjusts the flow rate of the heat exchange medium.
When the heat transfer tube group (16) extends toward the airflow direction while meandering across the airflow direction of the air passing through the heat exchanger (2), and when viewed from the airflow direction, the first. A non-overlapping zone (F) in which the two groups (G2) and the first group (G1) do not overlap and only the second group (G2) is included, and the second group (G2) and the first group (G1). ) Are formed in a laminated manner, and the diversion circuit (14) is configured so that the overlapping zones are sandwiched between the non-overlapping zones (F).
The valve (19) is controlled so that the cold water is circulated to the first group (G1) of the diversion circuit (14) of the heat exchanger (2) and not to the second group (G2) during cooling. An pneumatic radiant air conditioner provided with a control device (6). The pneumatic radiant air conditioner according to claim 1, wherein the heat transfer tube group (16) is formed of an elliptical tube. The radiation unit (1) includes a group of through holes (7) for discharging the air conditioning air to the air-conditioned space (S), and a heat storage unit (8).
The heat storage unit (8) is arranged with a gap through which the air-conditioning air passes, and at the same time, the air-conditioning air is rectified while being divided and diffused to pass through the through hole (7) through the air-conditioned space (S). 1 or 2 provided with a group of heat transfer plates (9) that are discharged to the air-conditioned space (S) and that store the heat of the air-conditioning air and radiate the heat from the through-hole (7) to the air-conditioned space (S). Described pneumatic radiant air conditioner.

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