JPH043871A - Individual cooling system - Google Patents

Abstract

PURPOSE:To maintain instruments in preferably condition at all times by a method wherein air, heated by heat generating instruments, is introduced into a ventilating space by a ventilating fan to cool it to a proper temperature by a cooling unit while the cooled air is returned into a space, in which desks and the like are provided, from an air outlet port through a partitioning under the condition of breeze. CONSTITUTION:A ventilating space 3, partitioned from the vicinity of heat generating instruments 20 so as to be communicated with a hollow partitioning 1, is provided below the top plate 21 of a desk 2 while a fan 4 is installed near an air inlet port 30 in the space 3 and a cooling unit 5 is installed near a communicating port 31 between the ventilating space 3 and the partitioning 1 respectively. Air outlet ports 10, consisting of a multitude of small holes, are provided on a surface faced to the heat generating instruments 20 in the comparatively upper part of the partitioning 1. Air in the space, in which the heat generating instruments 20 are installed, is guided into the space 3 by the operation of the fan 4 and is cooled by the cooling unit 5 to a proper temperature, then, is returned to the side where the desk 2 is installed from the upper air outlet ports 10 through the partitioning 1 under the condition of breeze.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is applicable to cases where the floor of a building or the like is partitioned and heat generating equipment such as an oAja heater is installed in this partitioned space. This invention relates to an individual cooling system in which air heated by a heat generating device is individually cooled in each partitioned space and returned to the partitioned space.

"Conventional technology" Recently, in intelligent buildings, etc., where floors are divided by partitions, many heat-generating devices such as information devices and OA devices that operate 24 hours a day are scattered throughout the room. If heat generated at all times is handled only by general indoor cooling or air conditioning, the central air conditioner will become larger and running costs will increase.

Moreover, in such an environment, the temperature difference between the partitioned parts becomes large, so we have developed a personal air conditioning system that provides air conditioning that is suitable for the perceived temperature of the individual working there. Kaihei 1-
144709, especially Figures 1 and 2 of the same publication.
As shown in the figure, a thermoelectric element and a fan are provided in the lower part of a hollow panel-shaped casing, and an air inlet is provided on the front of the casing at the installation position of the thermoelectric element, and an air inlet is provided above the thermoelectric element in the casing. The area is divided into a hot air passage and a cold air passage, and a fan is operated to cool a portion of the air taken in from the intake port on the heat absorption surface of the thermoelectric element, and then blow it out from the cold air outlet provided at the upper front of the national body. An auxiliary air conditioner has been proposed in which hot air heated by the heat radiation surface of a thermoelectric element is blown out from a hot air outlet at the top of the national body through the hot air passage.

According to this auxiliary air conditioner, by using the casing as a partition, individual cooling of each partitioned space is possible.

``Invention or problem to be solved'' The auxiliary air conditioner essentially does not perform heat exchange, so it generates hot air in addition to cold air, and works like an exhaust duct to discharge the hot air. Warm air treatment equipment is required, which results in high installation costs, and the installation of ducts on the ceiling damages the appearance, and if the amount of heat generated by the heat generating equipment is large, there is a risk that it will not be able to handle the problem. .

The object of the present invention is to provide an individual cooling system that overcomes the above-mentioned drawbacks.

"Means for Solving the Problems" In order to achieve the above-mentioned object, the individual cooling system according to the present invention provides an OA system for desks, etc. (including tables, cabinets, etc.) installed in hollow partitions. On floors where equipment and other heat generating equipment are installed,
A ventilation space leading from the vicinity of the heat generating equipment into the hollow partition is provided in the desk etc., and a ventilation fan and a cooling unit are provided in the middle of this ventilation space, and the cooling unit is installed in the floor slab or in the double floor. The liquid phase refrigerant piping and the gas phase refrigerant piping provided in the terminal are connected to a terminal heat exchanger, and the liquid phase refrigerant piping and the gas phase refrigerant piping are connected to a terminal heat exchanger. Provide a surface adjuster,
The partition is provided with an air outlet in a portion facing the space where the desk etc. are installed, and the air warmed by the heat generating device is guided into the ventilation space by the blower fan and cooled to an appropriate temperature by the cooling unit. The cooled air is then returned through the partition from the outlet to the space where the desk and the like are installed in a breeze.

The cooling unit includes a plurality of double pipes arranged in parallel at a predetermined interval, each of which has a plurality of double pipes arranged in parallel at a predetermined interval, into which an inner pipe is inserted through an inner wall of the outer pipe and a narrow flow gap into an evaporation portion containing a liquid level of the working fluid in the outer pipe. It is desirable to have an upper header pipe and a lower header pipe connected to both ends of the pipe, with the lower header pipe communicating with the liquid-phase refrigerant pipe and the upper header pipe communicating with the gas-phase refrigerant pipe.

More preferably, a large number of fins are attached to the double pipe.

"Operation" In the individual cooling system of the present invention, by operating a blower fan, the air warmed by the heat generating equipment is guided to the ventilation space and cooled to an appropriate temperature by the cooling unit, and the cooled air is passed through the partition. The air is returned from the air outlet to the space on the side where a desk or the like is installed.

The working fluid that evaporates in the cooling unit passes through the gas-phase refrigerant piping and condenses in the terminal heat exchanger, and the condensed working fluid flows by gravity to the liquid-phase refrigerant piping, reaches the cooling unit, and boils again. It circulates like this.

When the evaporator section of the cooling unit has a double-tube structure as described above, under low heat flux, the working fluid boils in the flow gap between the inner and outer tubes of the double-structured tubes, and this boiling The bubbles generated by this process expand rapidly and rise within the gap. The expansion and rise of these bubbles pushes up the unpurified working fluid, creating an upward turbulent flow of gas and liquid phases within the gap. The hydraulic fluid that has not been evaporated before being pushed up to the upper end of the inner tube falls into the inner tube from the upper end of the inner tube.

If the flow gap between the inner tube and the outer tube is made narrower, the air bubbles generated within the flow gap between the inner tube and the outer tube will push the unpurified working fluid higher.

Therefore, heat exchange is performed efficiently even under low heat flux.

"Embodiments" Examples of the present invention will be specifically described below with reference to the drawings.

As shown in FIG. 1, a floor a is divided by a hollow partition 1, and a desk 2 equipped with a heat generating device 20 such as office automation equipment is installed in the corner of this partition.

As shown in FIG. 2, a ventilation space 3 is provided on the f side of the top plate 21 of the desk 2, which is partitioned so as to communicate from the vicinity of the heat generating device 20 into the hollow partition l. Inside, a fan 4 is installed near the air intake port 30, and a cooling unit 5 is installed near the communication port 31 between the ventilation space 3 and the partition l.

In the relatively upper part of the partition l, the heat generating device 20
An air outlet 10 consisting of a large number of small holes is provided on the surface facing the direction in which the heat generating device 20 is installed, and when the fan 4 operates, the air in the area where the heat generating device 20 is installed is introduced into the ventilation space 3. It is cooled to an appropriate temperature by the internal cooling unit 5, and a slight breeze (in this example, 0.8 mm
The cooling unit 5 in this embodiment includes a plurality of double pipes 5a arranged in parallel at predetermined intervals in an inclined manner, as shown in FIGS. 2 to 5.
and upper and lower header pipes 5b and 5c connected to the upper and lower sides of each double pipe 5a, each double pipe 5a has a large number of fins 52 attached, and the upper and lower header pipes 5b
, 5c are supported by penetrating plate-shaped support frames 5d on both sides.

As shown in FIGS. 4 and 5, the double pipe 5a includes an outer pipe 50 made of a steel pipe or an aluminum alloy pipe, and an inner pipe made of the same material and inserted into the outer pipe 50 through a narrow flow gap 54. 51
The inner tube V51 is inserted into the outer tube 50 in a range that can cover the portion of the evaporator section b (Fig. 5) that contains the liquid level of the working fluid, and has a protrusion protruding toward the outer circumference at an appropriate portion. It is held within the outer tube 50 with the portion 53 abutting against the inner wall of the outer tube 50.

Instead of forming the protrusion 53 as described above on the inner tube 51, a similar inward protrusion is formed on the outer tube 50.
The inner tube 51 may be supported inside the outer tube 50 and the inner tube 51.
It is also possible to hold the inner tube 51 within the outer tube 50 by interposing a spacer (not shown) at a predetermined interval between them.

The upper header pipe 5b and lower header pipe 5c of the cooling unit 5 are connected to gas phase refrigerant pipes 7. installed in the floor slab 6 or double floor of the floor a in FIG. The gas-phase refrigerant pipes 7 and the liquid-phase refrigerant pipes 8 each communicate with a terminal heat exchanger 9 located at a higher level than the cooling unit 5.

A liquid level regulator 80 is provided in the liquid phase refrigerant pipe 8 to maintain an appropriate level so that the liquid level of the working fluid C in the cooling unit 5 is maintained several tens of centimeters above the surface of the floor a. It is set.

It is preferable that a small diameter pipe 5e constituting a gas-liquid separation mechanism be communicated with the upper part of one end of the upper header pipe 5b, as shown in FIG.

When a plurality of cooling units 5 are installed on the same floor a, the upper and lower header pipes 5b and 5c of each cooling unit 5 are connected to the gas phase refrigerant piping 7 and the liquid phase refrigerant piping 8, respectively, and each cooling unit 5 It is preferable that the space between the refrigerant pipe 8 and the liquid phase refrigerant pipe 8 be appropriately shut off by a Harz or the like (not shown).

A cold/heat source device 90 is installed at an appropriate location in the building, and the cold/heat source device i9 is connected to the cold/heat source device i9 from this cold/heat source device 90 via the terminal heat exchanger 9.
A cold water pipe 91 is provided that circulates the water back to zero. It is desirable to use an ice heat storage unit in this cold heat source device 90 so that late-night power can be effectively utilized or as a backup heat source in an emergency.

When the cooling unit 5 is provided on each floor of a building, a terminal heat exchanger 9 is installed on each floor, and the cold heat source device 90 is communicated with each terminal heat exchanger 9 through a cold water pipe 91.

The cooling unit 5 is operated with the liquid level of the working fluid C located between the lower end and the upper end of the inner pipe 51, and preferably the liquid level is 1/2 or less of the total length of the inner pipe 51. It is desirable to configure it so that it operates in the state.

In the cooling unit of the system of the embodiment, the pipe 5a
-1, when the heat flux is high, the working fluid inside the evaporator section rises steadily, and therefore the heat transfer coefficient is also high, or as the heat flux decreases, the working fluid inside the pipe increases. Bubbles generated by the rising temperature will accumulate on the surface of the liquid, creating a temperature distribution in the working fluid at the base portion and significantly reducing the heat transfer coefficient.

Then, as time passes, the boiling of the working fluid becomes intermittent, the heat transfer coefficient further decreases, and the operation becomes unstable.

However, since the tubes 5a of the cooling unit 5 in the individual cooling system of this embodiment have a double structure in the evaporator section as described above, even when the heat flux is low, the tubes 5a of the cooling unit 5 are Then, the working fluid C boils in the flow gap 54 between the outer tube 50 and the inner tube 51, and the gas @d generated by the boiling expands rapidly and rises in the flow gap 54, causing air to rise. By pushing up the hydraulic fluid C that has not turned into
A turbulent flow of gas and liquid phases occurs within the tank. In this way, the working fluid C boils while rising within the gap 54, and
The hydraulic fluid C that did not rise to 8 before reaching the upper end is in the inner pipe 5.
Fall within 1.

In this way, even if the heat flux is low, the working fluid C in the evaporator part always boils within the narrow gap 54, and the movement of the bubbles d causes the working fluid C in that part to enter a turbulent flow state, so the heat transfer coefficient decreases. It operates stably without any problems.

If the gap 54 between the outer tube 50 and the inner tube 51 is made narrower, even if the distance from the liquid level of the working fluid C to the upper end of the inner tube 51 is long,
The bubbles d generated by boiling within the flow gap 54 have a strong force pushing up the non-vaporized working liquid C, so that the above-mentioned working mc occurs from the liquid level to the upper end of the inner pipe 51. boil or repeat.

The vapor of the boiled working liquid C is completely separated from the working liquid C by a small diameter pipe 5e constituting the gas-liquid separation mechanism of the upper header pipe 5b in FIG.
The refrigerant reaches the terminal heat exchanger 9 through *mt, flows into the liquid phase refrigerant pipe 8 under its own weight, and is circulated through the pipe 8 to return to the cooling unit 5.

The cooling unit may be an example in which the heat generating device 20 is housed in the desk 2, or a table or cabinet (not shown) may be used in place of the desk 2.

"Effects of the Invention" The individual cooling system according to the present invention can be installed without spoiling the aesthetics of the room, and can be installed in information equipment or office automation equipment.
It is possible to keep these devices in a favorable state at all times by individually cooling the heat generated from the devices.

In addition, it is possible to maintain the partitioned space at a temperature that is suitable for the sensible temperature of the person working there, and it is also possible to sufficiently cope with cases where the amount of heat generated by the heat-generating equipment is large.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an example of an individual cooling system according to the present invention, Fig. 2 is a sectional view of the main parts in Fig. 1, $3
The drawings are partially enlarged front views of the cooling unit in the embodiment, FIG. 4 is an enlarged sectional view of the cooling unit, and FIG. 5 is an enlarged sectional view of essential parts of the cooling unit. Explanation of symbols in main drawings 1...Hollow partition 10 2...Desk 20 3...Ventilation space 30 31...Communication port 4, 5...Cooling unit 5a 5b, 5c...Upper and lower Header 5d...Support frame 50 51---Inner trFa・b...E starting point C・6...Floor slab 7・8...Liquid phase refrigerant piping 80---Liquid surface yAr61 unit 9・...Terminal heat exchanger patent applicant agent Shigeki Kono, patent attorney
Patent Attorney Kama 1) Irioman...Air outlet...Heating equipment...Intake...Blower fan...Double tube...Outer pipe...Floor...Working fluid/Gaus phase refrigerant Piping

Claims (3)

[Claims] (1) On a floor where office automation equipment or other heat-generating equipment is installed on a desk, etc. installed in a part separated by a hollow partition, the desk, etc. has a connection from the vicinity of the heat-generating equipment to the inside of the hollow partition. A ventilation space is provided, and a blower fan and a cooling unit are provided in the middle of this ventilation space, and the cooling unit is connected to the liquid phase refrigerant piping and the gas phase refrigerant piping provided in the floor slab or double floor. The liquid phase refrigerant piping and the gas phase refrigerant piping are connected to a terminal heat exchanger, a liquid level regulator is provided in the liquid phase refrigerant piping, and a front desk or the like is installed in the partition. An air outlet is provided in a part facing the space in which the air is heated, and the air heated by the heat generating device is guided into the ventilation space by the ventilation fan, cooled to an appropriate temperature by the cooling unit, and the cooled air is transferred into the partition. An individual cooling system characterized in that the individual cooling system is configured so that a breeze is returned from the air outlet to the space on the side where the desk or the like is installed through the air outlet. (2) The cooling unit includes a plurality of double pipes arranged side by side at predetermined intervals, with inner pipes inserted into the evaporation part containing the liquid level of the working fluid in the outer pipe through the inner wall of the outer pipe and a narrow flow gap. , consisting of an upper header pipe and a lower header pipe connected to both ends of each double pipe, with the lower header pipe communicating with the liquid-phase refrigerant pipe, and the upper header pipe communicating with the gas-phase refrigerant pipe. 2. Individual cooling system according to claim 1, characterized in that. (3) The individual cooling system according to claim 2, wherein the double pipe is provided with a large number of fins.