JPH06241497A - Under-floor air-conditioning system - Google Patents

Abstract

PURPOSE:To provide an under-floor air-conditioning system in which heat loads, so-called standing heat, locally generated around heating members such as office automation equipments can be locally treated without spoiling comfortableness in an office room. CONSTITUTION:A heat-exchange means, in which a refrigerant is allowed to circulate among an evaporator 54, a condenser 62, a receiver 66 and so on, is provided at the inside of a chamber 28 under a floor 26, and a plurality of air inlets 34, 35 are formed on the surface of the floor 26 in an office room 20. Conditioned cool air 32 supplied from an air-conditioner 38 to the inside of the chamber 28 under the floor is more cooled by the heat-exchanger means, following which its conditioned cool air is blown in the office room through the air inlets 34 positioned near heating members such as office automation equipments 52. On the other hand, the conditioned cool air 32 from the air- conditioner 38 is directly blown in the office room 20 through the air inlets 35 except the air inlets 34 near the heating members. In this way, local heat loads, so-called standing heat 70, generated from the heating members such as the office automation equipments 52 can be locally treated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor air conditioning system, and more particularly to locally removing local heat generated around a heating element such as OA equipment installed in an office or the like. The present invention relates to an underfloor air conditioning system with a device that can be added.

[0002]

2. Description of the Related Art In recent years, office buildings and the like have become more sophisticated and the installation density of office automation equipment and the like has increased. Therefore, there are many cases where a double floor is adopted as a space for wiring power cables for OA equipment and communication cables such as a local area network (LAN). Also, O
Due to the increase in sensible heat in the room due to the heat generated from the heating element such as the A-equipment, the number of cases where annual cooling is performed is increasing, and the total circulation amount of the conditioned air is increasing. For this reason, the air conditioning load increases, and the equipment running cost tends to increase.

In a general air conditioning system in an office building or the like, an air conditioning air outlet and a return air outlet are provided on the ceiling surface of an office room, and the air conditioning air from an air conditioner is blown out from the air outlet of the ceiling surface so that the office room is closed. After air conditioning, it is a method to inhale again from the return air port on the ceiling. In the case of such a ceiling blowout air conditioning system, in order to process the heat generated from the heating element such as the OA equipment, it is necessary to blow out the conditioned air blown into the office room to the entire office room. That is, the conditioned air blown out diffuses a heat load around a heating element such as an OA device, especially a so-called "heat pool" unevenly distributed around the floor surface, to make the temperature in the office uniform and thereby to generate local heat. The dwell was being processed. In this way, in the case of an air conditioning system with a ceiling blowing out, since the entire office room is subjected to air conditioning, the target area for air conditioning is large, especially when there is a wide indoor space such as the office room of an office building. There is a problem that running costs for air conditioning increase.

Under these circumstances, recently, there is a tendency to employ an underfloor air conditioning system which can utilize the double floor and can reduce the air conditioning load. This underfloor air-conditioning system is a system in which air conditioning control is performed on a so-called living space in which a person works or walks, rather than an entire room being air-conditioned.
Figure 1 shows a conventional underfloor air conditioning system. Explaining the outline of this system in the case of air conditioning, the air conditioner 1
The conditioned air 2 for cooling that has been conditioned in 1 is sent to the underfloor chamber 4 utilizing the double floor through the air supply duct 3. The conditioned air 2 sent into the underfloor chamber 4 is a living area in the office room 6 from a fan unit 5 installed in the underfloor chamber 4 through an air supply port formed on the floor 7 of the office room 6. 8 is blown out. The conditioned air 2 blown into the office room 6 is OA equipment 9 installed in the living area 8.
It is heated by a heating element such as and rises to the non-residential area 10 and waste heat of the residential area 8 is exhausted. The air that has risen to the non-residential area 10 is sucked into the ceiling chamber 13 through the plurality of intake ports 12 formed on the ceiling surface 11, is discharged to the outside through the return air duct 14, and a part of the air is discharged. Is mixed with fresh outside air introduced from the outside air introduction duct 15, and the air conditioner 1
Cycle back to.

As described above, in the case of the underfloor air conditioning system, the heat load of the living area 8 can be processed instead of the heat load of the entire office room 6, and the efficient air conditioning can be performed. Therefore, the running cost for air conditioning can be reduced.

[0006]

However, when the heat load locally generated by the heating element such as the OA equipment 9, that is, the so-called "heat pool 16" is large, the conventional underfloor air conditioning system has a "heat pool 16". There is a problem that it is not possible to quickly dissipate heat. As a result, in the vicinity of the "heat pile 16", the comfort is deteriorated because it is too hot. In addition, in order to process this "heat pool 16", the air conditioner 1
If the temperature of the conditioned air 2 supplied from the above to the underfloor chamber 4 is lowered, the "heat pool 16" can be treated,
There is a problem that it is too cold for a resident in an area without the "heat pool 16". Further, lowering the temperature of the conditioned air 2 supplied from the air conditioner 1 to the underfloor chamber 4 poses a problem in terms of energy saving.

The present invention has been made in view of the above circumstances, and a heat load "heat accumulation" locally generated around a heating element such as an OA device without impairing the comfort of the office.
It is an object of the present invention to provide an underfloor air conditioning system that can locally treat air.

[0008]

In order to solve the above-mentioned problems, the present invention provides the conditioned cold air supplied from the air conditioner into the underfloor chamber through a plurality of air supply openings formed on the floor of the air conditioned room. In the underfloor air conditioning system that blows into the room,
A heat exchanging means is provided in the underfloor chamber, and the air conditioning cold air supplied into the underfloor chamber is heat-exchanged from an air supply port of the plurality of air supply ports located near a heating element such as an OA device. It is characterized in that it is further cooled by means and then blown out to the air-conditioned room.

[0009]

According to the present invention, the heat exchange means is provided in the underfloor chamber, and the plurality of air supply ports formed on the floor surface of the air-conditioning chamber are connected to the air supply port located near the heating element such as OA equipment. Is
The conditioned cold air supplied into the underfloor chamber is further cooled by the heat exchange means and then blown out into the air conditioned room. On the other hand, the conditioned cold air supplied from the air conditioner to the underfloor chamber is blown out as it is from the air supply port other than the vicinity of the heating element into the air conditioned room. Thereby, the local heat load generated by the heating element such as the OA equipment can be locally cooled. Further, since the conditioned cold air adjusted to a comfortable temperature by the air conditioner is supplied from the air supply ports other than the vicinity of the heating element, the occupant is not uncomfortable by overcooling the air conditioned room.

As the heat exchange means, a system in which a refrigerant is circulated between the evaporator and the condenser, that is, a cooling system using latent heat of vaporization of the refrigerant in the evaporator is used, and the condenser is used in the evaporator. Since the installation position of is made higher, the refrigerant can be circulated without the need of external transfer power,
The increase in power cost due to the provision of the heat exchange means can be suppressed as much as possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an underfloor air conditioning system according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a configuration diagram of an underfloor air conditioning system of the present invention. As shown in FIG. 1, a ceiling chamber 24 is formed behind a ceiling 22 of an office room 20 composed of a living area 20A in which a person works or walks and a non-living area 20B above the living area 20A. , Under the floor 26 under the floor 2
8 is formed. The ceiling 22 of the office room 20 is provided with a plurality of intake ports 30 for sucking the air in the office room 20 into the ceiling chamber 24, and the floor 26 is provided with the conditioned air 32 supplied to the underfloor chamber 28. A plurality of air supply ports 34, 35 for supplying air to the office room 20 are provided. The ceiling chamber 24 is connected to the return air side of the air conditioner 38 via the return air duct 36, and the air supply side of the air conditioner 38 is connected to the underfloor chamber 28 via the air supply duct 40. Further, the exhaust duct 42 is connected in the middle of the return air duct 36,
An outside air introduction duct 44 is connected to the return air side inlet of the air conditioner 38. As a result, part of the return air air 46 is discharged to the outside from the exhaust duct 42, while the return air air 46 returned to the air conditioner 38 is mixed with the fresh outside air 48 taken in from the outside air introduction duct 44. It has become so. Also,
The air conditioner 38 is provided with a cooling coil 38A, a heating coil 38B, and a blower fan 38C in this order from the return air side, and the blower fan 38C is connected to the air supply duct 40. Further, fan units 50 and 51 are provided on the underfloor chamber 28 side of the air supply ports 34 and 35, forcing the conditioned air 32 supplied into the underfloor chamber 28 into the office room 20, respectively. .

Next, the improved portion of the present invention will be described. Of the fan units 50 and 51, the OA device 5 is used.
The fan unit 50 provided at the air supply port 34 near the heating element such as 2 has a structure integrated with the evaporator 54. The evaporator 54 is composed of an air system passage and a refrigerant system passage, and the air system passage is the air intake port 5 of the evaporator 54.
The conditioned air taken in from 6 is heat-exchanged with the refrigerant and blown into the office room 20 by the fan unit 50. On the other hand, in the refrigerant system path, a refrigerant gas pipe 58 extending from the outlet of the evaporator 54 is connected to an inlet of a condenser 62 provided in an upper portion of a machine room 60 adjacent to a side wall of the office room 20, and the condenser 62 is connected. The refrigerant liquid pipe 64 extending from the outlet of the refrigerant is connected to the inlet of the evaporator 54 via the receiver tank 66, and the refrigerant circulates between the evaporator 54 and the condenser 62. Further, the condenser 62 is provided with a cold water pipe 63 for circulating cold water from an ice heat storage tank (not shown). Further, the height of the receiver tank 66 is provided at a height approximately in the middle between the evaporator 54 and the condenser 62.

Next, the operation of the underfloor air conditioning system of the present invention constructed as described above will be described in the case of performing cooling air conditioning. The conditioned cold air 32 for cooling, which has been cooled to a predetermined temperature by the air conditioner 38, is supplied into the underfloor chamber 28 via the air supply pipe 40. The conditioned cold air 32 supplied into the underfloor chamber 28 is blown out directly from the air supply port 35 into the office room 20 by the fan unit 51.
And the conditioned cold air taken in from the air intake 56 of the evaporator 54. The conditioned air 32 blown directly from the fan unit 51 into the office room 20 has a temperature adjusted to a predetermined temperature by the air conditioner 38 in the office room 20,
After mainly air-conditioning the living area 20A, the air is taken into the ceiling chamber 24 through the air inlet 30. Ceiling chamber 24
The return air 46 sucked inside passes through the return air duct 36,
A part of the air is exhausted from the exhaust duct 42 to the outside and is mixed with the fresh outside air 48 introduced from the outside air introduction duct 44 to be circulated back to the air conditioner 38. This circulation is similar to conventional underfloor air conditioning systems.

On the other hand, the conditioned cold air 32 taken into the air intake port 56 of the evaporator 54 undergoes heat exchange with the refrigerant in the evaporator 54, and becomes a temperature lower than the temperature adjusted by the air conditioner 38. To be cooled. This low temperature air conditioning cold air 68 is
The fan unit 50 integrated with the evaporator 54 blows the air into the office 20 through the air supply port 34. Then, the low-temperature air-conditioning cold air 68 blown into the office room 20 cools the heat load generated by a heating element such as the OA equipment 52, a so-called “heat pool 70”, and is warmed by itself to the ceiling chamber from the intake port 30. 24 is sucked into the inside of the room 24 and the normal air-conditioning cold air 3 described above
The circulation returning to the air conditioner 38 is performed in the same manner as the circulation of 2. As a result, the "heat pool 7" near the heating element such as the OA device 52 is
Since the local air conditioning that supplies the low-temperature air-conditioned air 68 only to the living area 20A where "0" is generated can be performed, the other living area 20A does not become too cold.

The refrigerant gasified in the evaporator 54 during heat exchange with the conditioned air 32 is conveyed to the condenser 62 through the refrigerant gas pipe 58, cooled in the condenser 62, condensed, and liquefied again. After that, it is circulated by being stored in the receiver tank 66 through the refrigerant liquid pipe 64 and conveyed from the receiver tank 66 to the evaporator 54. That is, the evaporator 54 cools the conditioned cold air 32 taken into the evaporator 54 by utilizing the fact that the surrounding heat is absorbed by the latent heat of evaporation when the liquid refrigerant is evaporated and gasified. Further, as described above, the condenser 62 is installed at a high position, and the receiver tank 66 and the evaporator 54 are installed at lower positions in this order, so that the refrigerant gas gasified in the evaporator 54 is a gas and a liquid. Due to the sudden expansion of the volume due to the difference in density, the refrigerant gas pipe 58 can be moved to reach the condenser 62 without requiring external power. Further, the liquid refrigerant liquefied in the condenser 62 can fall in the receiver tank 66 by its own weight in the refrigerant liquid pipe 64, and can return from the receiver tank 66 to the evaporator 54 by its own weight. As a result, the heat exchanging means added to the underfloor air conditioning system of the present invention does not require a refrigerant transfer pump, and therefore the increase in power cost due to the provision of the heat exchanging means can be suppressed as much as possible.

As described above, when the underfloor air conditioning system of the present invention is used, the heat load locally generated around the heating element such as the OA equipment 52, that is, a so-called "heat pool", without impairing the comfort of the living area 20A. 70 "can be processed. Incidentally, in the present embodiment, the heat exchange means constituted by an evaporator, a condenser and the like, which requires less power cost, has been described.
The heat exchanger is not limited to this, and other heat exchangers may be used. Moreover, although the fan unit and the evaporator have been described as an integral structure, a plurality of fan units may be provided for one evaporator.

[0017]

As described above, according to the underfloor air conditioning system of the present invention, the OA installed in the air conditioning room
A local heat load generated by a heating element such as a device, that is, a so-called “heat pool” can be locally processed. On the other hand, in areas other than the installation location of heating elements such as OA equipment in the air-conditioning room,
It is possible to supply conditioned cold air adjusted to a comfortable temperature with an air conditioner. Thereby, in order to handle the heat load,
Since it is not necessary to make the conditioned cold air supplied from the air conditioner to the air conditioning room extremely low, the occupant will not feel uncomfortable because the air conditioning room is overcooled.

As described above, when the underfloor air conditioning system of the present invention is used, it is possible to locally treat the heat addition locally generated by the heating element such as the OA equipment without deteriorating the comfort of the air conditioning room. it can. Further, as a heat exchange means for processing the heat load, a method of circulating a refrigerant between an evaporator and a condenser, that is, a cooling method using latent heat of vaporization of the refrigerant in the evaporator is used, and the evaporator is used. Since the condenser is installed at a higher position, the refrigerant can be circulated without requiring external transfer power. As a result, the increase in power cost due to the provision of the heat exchange means can be suppressed as much as possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an underfloor air conditioning system according to the present invention.

FIG. 2 is a configuration diagram showing a conventional underfloor air conditioning system.

[Explanation of symbols]

 20 ... Office 24 ... Ceiling chamber 28 ... Underfloor chamber 30 ... Intake port 32 ... Air conditioning air 34, 35 ... Air inlet 38 ... Air conditioner 50, 51 ... Fan unit 54 ... Evaporator 62 ... Condenser 66 ... Receiver tank 68 … Low temperature conditioned air 70… Heat pool

Claims (3)

[Claims] 1. An underfloor air conditioning system in which conditioned cold air supplied from an air conditioner into the underfloor chamber is blown into the air conditioning room from a plurality of air supply openings formed on the floor surface of the air conditioning room. A heat exchange unit is provided in the air-conditioning unit, and the air-conditioning cold air supplied into the underfloor chamber is further cooled by the heat exchange unit from the air supply port located near the heating element such as OA equipment among the plurality of air supply ports. The underfloor air conditioning system is characterized by blowing out into the air conditioning room after that. 2. The heat exchange means is formed by circulating a refrigerant between an evaporator that cools the conditioned cold air and a condenser, vaporizes the refrigerant liquid in the evaporator, and converts the refrigerant gas in the condenser. The underfloor air conditioning system according to claim 1, wherein the underfloor air conditioning system is liquefied. 3. The underfloor air conditioning system according to claim 2, wherein the condenser is installed at a position higher than the evaporator.