CN103039137A

CN103039137A - A rear door heat exchanger

Info

Publication number: CN103039137A
Application number: CN2011800334261A
Authority: CN
Inventors: 戴恩·迪代米奥蒂斯
Original assignee: Eaton Williams Group Ltd
Current assignee: Eaton Williams Group Ltd
Priority date: 2010-05-14
Filing date: 2011-05-12
Publication date: 2013-04-10
Also published as: EP2570012A1; JP2013531837A; US20130126142A1; GB201008099D0; WO2011141710A1

Abstract

A rear door heat exchanger adapted to be mounted on the rear of a rack or other arrangement of heat-generating electronic equipment, and to cool air which passes therethrough when the rear door heat exchanger is in use. It comprises an upstream header and a downstream header with a multiplicity of substantially parallel microchannels extending between and in fluid communication with both the upstream header and the downstream header. Thus both headers are common to the microchannels of the said multiplicity of microchannels.

Description

Rear door heat exchanger

Technical field

Background technology

Data center cools off by peripheral cooler (perimeter cooling) usually, the air of wherein going to the liquid heat interchanger is positioned at the periphery of machine room, and air is delivered to the heat exchanger of the below, floor of data center from the internal pump of data center, and the pore from there process flooring material (flooring) enters the passage between the multiple blade rows open frame (blade rack) up.Therefore, these passages are cooling ducts.Cooling-air in these passages passes between blade by convection current, and therefrom passes and the opposite sides of the frames of row more than arriving, and enters the passage of heat.Hot-air in the passage of heat flows to air above the frame by convection current, and then the ceiling of flowing through flows to the heat exchanger of peripheral cooler down again.This circulation is carried out continuously, remains on for blade (blade) with the temperature with this center and effectively moves and acceptable reduced levels.

Along with the raising of the serviceability of blade, the increase of air amount of cooling water in the data center just become quite demand and even very necessary.Because this mode can be restricted to amount of cooling water, the cooling capacity that improves simply peripheral cooler may not be a kind of selection.This problem is solved by the fluid heat exchanger of air separately being given to the frame back as an addition (air stream flows out from frame at place, frame back).Thereby in this sense, " back " refers to the side that cooling-air flows out that is used for of frame (perhaps other heating electric subsets).This heat exchanger is called rear door heat exchanger.The temperature that is provided to the cooling agent of existing rear door heat exchanger approximately is the temperature that is considered to conventional room temperature usually, and perhaps lower a little temperature only typically is in 18 ℃ to 22 ℃ the scope.Because the temperature when air flows out from blade is higher, may be to be in 35 ℃ to 45 ℃ scope, thereby this is still effective.

Existing rear door heat exchanger comprises: the upstream part (header) and the downstream head part that are adjacent to and normally arrange vertically in interchanger one side, a part stretches out horizontal tube from the upstream, opposite side at heat exchanger rotates 180 °, then extends horizontally to the downstream head part.This structure relates to the use of pipe relatively very wide to diameter and that made by the heavy metal parts, thereby so that this rear door heat exchanger is heavy, cost is high and it is mobile to be difficult to.

Summary of the invention

The present invention is intended to eliminate one or more in these defectives, yet be to be understood that, for the cooling to the air of any heating electric subset of flowing through (no matter this equipment whether can be called exactly vane type frame or a plurality of vane type frame), the present invention is effective.

Therefore, the present invention relates to a kind of rear door heat exchanger, be applicable to be installed in the frame of heating electric subset or the back of other accessories, and when using described rear door heat exchanger, it is used for the air that described rear door heat exchanger is passed in cooling, this rear door heat exchanger comprises: a upstream part and downstream head part, wherein extend between a described upstream part and described downstream head part substantially parallel a plurality of microchannels, and these two all has fluidic intercommunication described a plurality of microchannel and a described upstream part and described downstream head part, so that this two stature spare all shares for the microchannel of described a plurality of microchannels.

This is convenient to the lightweight rear door heat exchanger of framework, more particularly, owing to having used a plurality of microchannels, thereby so that the ratio between the Sectional Area of heat-exchanger surface area and coolant channel is very high, and has promoted ventilation and the discharging of heat exchanger.

Preferably, when preparing to use when installing rear door heat exchanger, erect a plurality of microchannels.

Have along in the vertical direction in a plurality of microchannels in the upwardly extending situation in side of at least one parts, further promote ventilation and the discharging of heat exchanger.

A described upstream part can be upper square toes spare, and described downstream head part can be lower square toes spare.

Each microchannel extends to it towards the position that described downstream head part is opened from it towards the position that a described upstream part is opened, and this is the one way path, not bending.

This has promoted high heat absorption capacity, and has promoted the operation of interchanger by the relatively low pressure drop that strides across interchanger, and has further promoted ventilation and the discharging of heat exchanger.

For the purpose of this paper, the microchannel will be considered to consist of less than any path of 3.5mm by internal cross section diameter or width.Preferably, the internal cross section diameter of a plurality of microchannels or width are in the scope from 0.5mm to 3.0mm basically.More preferably, the internal cross section diameter of a plurality of microchannels or width are 1.1mm basically or are 0.8mm basically.

Can form spiral lines (rifled) in the inside of some or all microchannel, so that more excellent heat transmission to be provided between cooling agent and a plurality of microchannel.

This rear door heat exchanger has a plurality of passages that utilize a plurality of pipes to arrange, and a kind of easily structure about this rear door heat exchanger is provided therefrom.

By with respect to the horizontal expansion of a plurality of microchannels and the material strips that contacts with a plurality of micro channel heats, can be so that rear door heat exchanger be more effective.

If this interchanger comprises metal or metal alloy, then it can obtain good exchanger efficiency.For example, this rear door heat exchanger can comprise aluminium.Advantageously, for ventilation and the discharging that improves passage, upper square toes spare is a upstream part, yet according to location arrangements and performance requirement, this upstream part also can be lower square toes spare.

Description of drawings

The example of rear door heat exchanger of the present invention is described to implement in more detail now with reference to accompanying drawing, wherein:

Fig. 1 illustrates from data center's one side of adding a plurality of rear door heat exchangers and the square from it perspective view in the past of seeing, each rear door heat exchanger is implemented the present invention;

Fig. 2 illustrates the lower flat figure of the parts of device as shown in Figure 1;

Fig. 3 illustrates from the back of installing shown in Fig. 1 and Fig. 2, see perspective view in the past from a side and the top of the part of this device, and some parts of this device of drawing are transparent in to manifest miscellaneous part;

Fig. 4 illustrates the front view of a part of installing shown in Fig. 3, and for the sake of clarity, some parts of this device are removed;

Fig. 5 illustrates the end view of a part of installing shown in Fig. 4, and a side of this device is removed to manifest more multi-part;

Fig. 6 a illustrates the as shown in Figure 4 and Figure 5 profile of three different embodiment of the part of device to Fig. 6 c; And

Fig. 7 illustrates the as shown in Figure 4 and Figure 5 front view of the part of device with larger proportion.

Embodiment

Fig. 1 illustrates the data center 100 that is provided with refrigeration unit 110, and this refrigeration unit 110 is connected to peripheral cooler 120 cooling water is provided.Data center 100 is provided with multiple blade rows open frame 140, and this vane type frame 140 is provided with rear door heat exchanger 142 separately.Cooling water from refrigerator 110 is pumped into peripheral cooler 120 via feed conduit 143, turns back to refrigerator 110 from the hot water of peripheral cooler 120 via another pipe 144.

Periphery cooler 120 and be seated on the rising floor 145 with their the vane type frame 140 of rear door heat exchanger 142.A plurality of vane type frames 140 are arranged to a plurality of rows 146.Pore 148 is arranged in the rising floor 145 in the one or more passages 150 between a plurality of rows 146, and adjacent passage 152 does not have pore, so that be with leachy passage and have leachy passage staggered and do not establish.When usage data center 100, the hot-air in the passage of heat 152 rises up, passes frame 140 and utilizes this hot-air absorption from the cooling-air of adjacent cooling duct 150.This has set up the continuous absorption (a continual draft ofcool air) of the cooling-air stream that passes frame 140.Hot-air rises towards the ceiling of data center, and outwards flows to peripheral cooler 120, and hot-air is in the cooling of peripheral cooler 120 places, and therefore landing down and flowing out from peripheral cooler 120 below rising floor 145.By so that cold air rises up via pore 148 so that convection current continue, to continue this air cool cycles.

This rear door heat exchanger 142 provides the extra cooling to the air of the data center 100 that flows through.

Coolant distribution unit 200 with coolant distribution to rear door heat exchanger 142.From Fig. 2, more easily find out the method for salary distribution of coolant distribution unit 200.Like this, coolant distribution unit 200 is connected to primary coolant loop 210 and secondary cooling agent loop 214, wherein these primary coolant loop 210 heat are couple to the heat exchanger 212 of coolant distribution unit 200, and this secondary cooling agent loop 214 also is couple to this heat exchanger 212 of this coolant distribution unit 200, thereby the cooling agent of heat from secondary loop 214 is delivered to the cooling agent in the primary return 210 when the operation of this device.For this purpose, as the cooling agent in the secondary cooling agent loop 214, the cooling agent in the primary return 210 is pumped via coolant distribution unit 200.

Each rear door heat exchanger 142 is connected to the cooling agent that receives from the upstream side 216 in secondary cooling agent loop 214 by means of upstream connector path 218, and cooling agent is turned back to the downstream 220 in secondary cooling agent loop 214 by means of downstream connector 222.

Fig. 2 also shows the fan inside 224 of vane type frame 140, and this fan impels air to pass frame to flow to rear door heat exchanger 142.

Fig. 3 illustrates the outside panelling of vane type frame 140 and the combination of the rear door heat exchanger 142 that is installed in vane type frame 140 backs.As shown in Figure 3, the latter is hinged to frame 140 at the left-hand side of frame 140.The backboard 226 of door 142 is provided with a large amount of through holes 228 so that air process rear door heat exchanger 142.Because the latter is hinged to frame 140, thereby it can open, so as can near the back of rear door heat exchanger 142 self and frame 140 the two.

Can know the further feature of seeing each rear door heat exchanger 142 from Fig. 4 and Fig. 5.Like this, rear door heat exchanger 142 has the extruding product 406 of hinge 400, a upstream part 402, below downstream head part 414 and a plurality of hollow bar or elongation, see over from Fig. 4, wherein this hinge 400 is positioned at the right-hand side of rear door heat exchanger 142, when from Fig. 4, seeing past tense, this upstream part 402 is positioned at the front of its backboard 226, this upstream part 402 is connected with the vertical arrangement component of upstream connector 218, this below downstream head part 414 is connected to the vertical part of downstream connector 222, and each hollow bar or elongation extruding product 406 all provide a plurality of microchannels.These microchannels are parallel to each other and vertical layout basically all, there is fluidic intercommunication the inside of their upper end and upstream, a top part 402, and from the upside down lower end that extends to them, do not have bending or bending, there is fluidic intercommunication the inside of this lower end and below downstream head part 404.For the sake of clarity, all microchannel extruding products 406 are not shown, and only showing the left-hand side of rear door heat exchanger 142 and the microchannel extruding product of right-hand side, the blank space between shown microchannel extruding product is filled up by these microchannel bars.

Supply valve (bleeder valve) 408 is arranged in the top of upstream, a top part 402, and bleeder valve 410 is arranged in the bottom of below downstream head part 414.

Cooling U-shaped fin 412(only schematically shows some lines of U-shaped fin in Fig. 4) each all pushes product 406 thermo-contacts with respect to extruding product 406 horizontal expansions of a plurality of microchannels and with described a plurality of microchannels in " U " of this fin 412 font bases.Have these fins 412 from the top of microchannel extruding product 406 to its lower end one tunnel.

Fig. 6 a illustrates the profile of each microchannel extruding product 406.Like this, each extruding product is the aluminium extrusion product, and its section elongates, approximately the long and about 2mm of 20mm is wide, having roughly is a plurality of microchannels 440 of rectangular section, and the width of each approximately is 1.4mm in this microchannel 440, and the thickness of the wall 442 of bar 406 approximately is 0.3mm.The profile of each end passage is fillet in section, is complementary with the rounded end 444 with described section.

Each extruding product 406 is orientated like this, and its straight flange is roughly parallel with the flow direction of the air that passes heat exchanger 142.

Fig. 7 clearly show that a plurality of fins 412, and this illustrates the front view on the top of each heat exchanger 142.The fin of adjacent microchannel extruding product 406 cross one another (interdigitate).

Connector

218 and 222 vertical part, a part 402 and 414, microchannel extruding product 406 and a plurality of fin 412 all are made of aluminum.Accordingly, it should be understood that owing to having used lightweight aluminium, thereby these rear door heat exchanger 142 integral body are relatively light.And it manufactures more cheaply, also more easily installs.And the use of microchannel has increased the external surface area of coolant channel of rear door heat exchanger 142 to the ratio of internal capacity.And the use of the microchannel of vertically extending impels from the air of rear door heat exchanger or other gas easily to be supplied with by means of valve 408, and impels from the liquid coolant of rear door heat exchanger 142 and easily release by valve 410.Should be appreciated that a top upstream part 402 and below downstream head part 404 all share for all microchannels 440.

When using this device, such as the front with reference to as described in Fig. 1, air is through data center's circulation, and cooling agent is pumped through primary return 210 and secondary loop 214, flow to from the cooling agent of secondary loop 214 upstream sides each rear door heat exchanger 142 upstream connector 218 vertical part and arrive at its a upstream part 142, cooling agent descends from this position, enter below downstream head part 404 through the microchannel of microchannel bar 406, and the vertical part that passes downstream connector 222 enters the downstream 220 of secondary loop 214.Enter the passage of heat 152 along with air passes rear door heat exchanger 142 and passes punching panel 326, this passage that flows through the cooling agent of rear door heat exchanger has cooled off the air that passes associated vanes open frame 140.

The cooling agent that can use in each rear door heat exchanger 142 can comprise water or R134a cold-producing medium (HFA 134a).The latter can be presented in the microchannel of microchannel extruding product 406 by two-phase state (these two kinds of the gentle phases of liquid phase attitude).

In formed structure without departing from the scope of the invention, for the reader, various remodeling and modification to shown device can appear.For example, each microchannel extruding product bending bar that can be provided with separately replaces fin 412.When relative hour of the pressure reduction between square toes spare 402 on the shown configuration requirement and the lower square toes spare 404, connector 218 also can be conversely with the connection of being connected, the former is connected to the downstream 220 of secondary loop 214 like this, and connector 222 is connected to the upstream side 216 of secondary loop 214, cooling agent flows up via the microchannel of microchannel bar 406 like this, rather than via the microchannel towards current downflow.

The preferred variant section of microchannel extruding product 406 has been shown among Fig. 6 b, this microchannel extruding product 406 is that 16mm is long, 1.8mm is wide, microchannel with 8 square profiles, it is wide that each square profile is 1.12mm, the bight is fillet slightly, and the outermost end of the microchannel section at two ends is fillet, and the thickness of this wall is 0.34mm.

Another preferred variant section of microchannel extruding product 406 has been shown among Fig. 6 c, and this microchannel extruding product 406 is that 25.4mm is long, 1.3mm is wide.It also has 10 microchannels, and wherein 8 of the centre have rectangular section, and the corner is fillet slightly, and is that 1.88mm is long, and 0.76mm is wide.The microchannel at two ends also is to be fillet in outermost end.Like this, this wall thickness along the rectangle longer sides is 0.27mm, and the wall thickness of this bar between adjacent microchannel is 0.6mm.

Obviously this rear door heat exchanger 142 can be redeployed as and be hinged on an opposite side to that indicated in the drawings.

Typically, when using this device, the temperature of the cooling agent in the upstream side 216 in secondary cooling agent loop 214 will be in 10 ℃ to 25 ℃ scope basically, be preferably from 15 ℃ to 20 ℃ more preferably 18 ℃.When using this device, the temperature of the cooling agent in the downstream 220 in secondary cooling agent loop 214 will be in 20 ℃ to 35 ℃ scope basically, be preferably 25 ℃ to 30 ℃, more preferably 28 ℃.

In the device of Fig. 4 and Fig. 5, the cooling power of the bar shown in Fig. 6 b (cooling duty) is in the scope of from 10 to 30 liters of per minutes (l/m) basically, is preferably 15 to 25l/m, more preferably 20l/m.For the extruding product shown in Fig. 6 c, the cooling task is in the scope of from 30 to 50 liters of per minutes (l/m) basically, is preferably 35 to 45l/m, more preferably 40l/m.

Claims

1. rear door heat exchanger, be used for being installed in the frame of heating electric subset or the back of other accessories, and when using described rear door heat exchanger, it is used for the air that described rear door heat exchanger is passed in cooling, this rear door heat exchanger comprises: a upstream part and downstream head part, wherein extend between a described upstream part and described downstream head part substantially parallel a plurality of microchannels, and these two all has fluidic intercommunication described a plurality of microchannel and a described upstream part and described downstream head part, so that this two stature spare all shares for the microchannel of described a plurality of microchannels.

2. rear door heat exchanger according to claim 1, wherein, when preparing to use when installing described rear door heat exchanger, extend in the direction that has at least one parts along in the vertical direction described a plurality of microchannels.

3. rear door heat exchanger according to claim 2, wherein, when preparing to use when installing described rear door heat exchanger, erect described a plurality of microchannels.

4. according to the described rear door heat exchanger of aforementioned arbitrary claim, wherein, a described upstream part is upper square toes spare, and described downstream head part is lower square toes spare.

5. according to the described rear door heat exchanger of aforementioned arbitrary claim, wherein, each microchannel extends to it towards the position that described downstream head part is opened from it towards the position that a described upstream part is opened, and this is the one way path, not bending.

6. according to the described rear door heat exchanger of aforementioned arbitrary claim, the internal cross section diameter of each microchannel or width are less than 3.5mm.

7. rear door heat exchanger according to claim 6, wherein, the internal cross section diameter of each microchannel or width are in the scope from 0.5mm basically to 3.0mm basically.

8. rear door heat exchanger according to claim 7, wherein, internal cross section diameter or the width of each microchannel are essentially 1.1mm.

9. rear door heat exchanger according to claim 7, wherein, internal cross section diameter or the width of each microchannel are essentially 0.8mm.

10. according to the described rear door heat exchanger of aforementioned arbitrary claim, wherein, the inside of at least one microchannel forms the spiral lines so that more excellent heat conduction to be provided between cooling agent and described a plurality of microchannel in described a plurality of microchannels.

11. according to the described rear door heat exchanger of aforementioned arbitrary claim, wherein, described a plurality of microchannels are by a plurality of pipe settings.

12. according to the described rear door heat exchanger of aforementioned arbitrary claim, also comprise with respect to described a plurality of microchannels horizontal expansion and the material strips that contacts with described a plurality of micro channel heats.

13. according to the described rear door heat exchanger of aforementioned arbitrary claim, comprise metal or metal alloy.

14. rear door heat exchanger according to claim 13 comprises aluminium.