Universal Telescopic Louvered Panel Attachment and System for Passive Stack Effect Cooling in a Data Center

Abstract

A telescopic louvered panel and system for enhancing cold aisle and hot aisle passive stack effect cooling efficiency in a data center is provided. The panel has a panel frame with a pair of vertical side walls. Each of the side walls has a back flange portion with mounting apertures for mounting the panel frame to either one of a computer cabinet or server door. A series of horizontally telescoping blade members have opposite ends which are pivotally connecting the side walls. The blade members are capable of slidably adjusting a width dimension of the frame, and pivoting on a horizontal plane. A vertical tilt bar links the blades together so that the blades push to open and close in unison.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. 120, the Applicant claims the benefit of U.S. Ser. No. 13/135,452, filed Jul. 6, 2011, pursuant to 35 U.S.C. 111(a), which claims the benefit, pursuant to 35 U.S.C. 119(e), of U.S. Ser. No. 61/398,893, filed, pursuant to 35 U.S.C. 111(b), on 6 Jul. 2010.

STATEMENT OF FEDERALLY SPONSORED RESEARCH

Not Applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to passive cooling of computer servers in a data center. In particular, it relates to an improved telescopic louvered panel attachment and system for enhancing hot aisle and cold aisle passive stack effect cooling in a data center.

2. Description of the Related Art

Raised floors are used in data centers to create a space between a sub-floor of the building and the normal working environment of the computer room. The space between the sub-floor and the raised floor panels creates an under-floor cool-air circulating plenum for thermal management of the data processing servers installed in banks of rack systems installed on top of the raised floor. The floor panels, themselves, are either solid or perforated.

Overall, the cooling components, of a computer room, are charged with creating, and moving air on the data center floor. From there, the room itself must maintain separate climates in relation to the cool air, which is required by the servers, and the hot air which they exhaust. Without separate boundaries, the air paths mix, resulting in both economic and ecological consequences.

Air-grate floor panels are used to separate the computer room into a lower-plenum and upper-plenum air handling boundary configuration where the cooling air “originates” in the lower plenum, flows upwardly through the openings in the air-grate panels, and is made available to flow through the cold air intake apertures in the server doors, for cooling the server cabinets installed in the upper plenum on the raised floor, of the computer room. In operation, the data processors heat the air, as it flows through the server, and the heated air is returned to the computer room air conditioning units (“CRAC”) where the heated air is cooled and recycled back into the lower, or under-floor, plenum.

A further refinement came when the industry generally accepted the design concept of “hot aisle and cold aisle” containment, as an additional means for thermal separation in the computer room. This design uses a combination of the CRAC units, duct work, and perforated air-grate floor panels to achieve hot aisle/cold aisle air flow separation. The installation aligns data center cabinets into alternating rows, endures in critical facilities throughout the world, and is widely regarded as the first major step in improving airflow management. In use, part of the air flow enters the server racks, and part of the air flow bypasses the server cabinets and returns to the CRAC air handling units. That portion of the air which enters the servers, through the server door intake, is heated, the heated air is then exhausted through the server cabinet back panel, and the heated air is then returned to the CRAC air handling units for recycle into the lower plenum. Typically, some intermixing of the hot and cold air paths is experienced due to improper sealing in the rack, or recirculation above and around the sides of the rack rows, which lowers the operational thermal efficiency of the system.

Other conditions might occur which interfere with achieving optimum cooling efficiency in a “hot aisle/cold aisle” construction, as well. For example, “bypass air” is an interfering condition often observed when conditioned air escapes through cable cut-outs, holes under cabinets, misplaced perforated tiles, or through holes in the perimeter walls of the computer room. Bypass air limits the precise delivery of cold air at the server door intake.

“Hot air recirculation” is also an interfering condition found under conditions where waste heat enters the cold aisle. In order to combat this condition, operators ensure that the cooling infrastructure must throw colder air at the equipment to offset mixing. Hot air contamination is also a condition which prohibits the CRAC units from receiving the warmest possible exhaust air which renders their operation less efficient. Finally, hot spots may still persist as a result of any, or all, of the above conditions.

It is desirable to process even greater volumes of data at higher velocities. However, a problem exists because such advancements lead to proportional increases in the operational energy of thermal dissipation for any given system. Indeed, those observed increases, in the thermal dissipation energy, are now exceeding even the most advanced operational design limitations. Thus, certain operators are now working on different ways to lower the temperature set-point of the entire data center in order to enhance cooling of those computer servers which are positioned in the upper reaches of the server racks installed in the upper plenum.

One such solution to the problem is directed toward an effort in continuing to redesign the air flow characteristics of the air-grate panels themselves. For example, in U.S. Pat. Ser. No. D567,398, Meyer teaches the design of air-grate floor panels having air scoops projecting downwardly as part of the superstructure of the air-grate sub-frame. It is readily apparent that this scoop design would act to capture conditioned air, as it flows in a generally horizontal direction through the lower plenum of a raised floor, and redirect it upwardly into the upper plenum through the slotted perforations in the air-grate raised floor panel plate.

As above, the concept of “hot aisle/cold aisle” employs improvements in the design and location of the CRAC units, duct work, blowers, and the raised floor panels themselves, as a cooling infrastructure which focuses on a separation of the make-up cold air and the exhaust hot air throughout the system. However, some additional design improvements have yet to be fully realized. One such improvement, would take into consideration certain modifications to the server door air intake configuration.

Early versions of server enclosures, often with “smoked” or glass front doors became obsolete with the adoption of “hot aisle/cold aisle” technologies. As a result, the use of ventilated doors became necessary for use with the “hot aisle/cold aisle” passive cooling approach. For this reason, perforated doors have gained wide acceptance in the industry for most off-the-shelf server enclosures. One improvement in the overall design of the computer server doors and back panel enclosures has been published in U.S. Pat. Publ. No. US-2012-009862-A1, to Meyer. There, Meyer teaches the use of either one of a louvered server door and cabinet back panel which opens and closes to variably restrict or direct a cooling airflow and hot air exhaust through the server cabinet. The louvered doors and back panels enhance a new concept using a hot aisle and cold aisle passive “stack effect” cooling dynamic which is based on a thermal buoyancy differential between the cold air and hot air streams in a system.

While the foregoing louvered server doors and cabinet back panels illustrate useful improvements for enhancing hot aisle and cold aisle passive stack effect cooling technology, these assemblies often require custom fabrication and are thus often unsuitable for inventory, immediate shipment, and use. Thus, what is needed is an improved louvered panel attachment which is mountable for retrofit installation on an existing server door and cabinet panel, together with an improved system for hot aisle and cold aisle passive stack effect cooling efficiency in a data center. The present invention satisfies these needs.

BRIEF SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide an improved louvered panel attachment which is mountable for retrofit installation on an existing server door and cabinet panel.

It is yet another object of the present invention to provide an improved system for hot aisle and cold aisle passive stack effect cooling efficiency in a data center.

To overcome the problems of the prior art, and in accordance with the purpose of the present invention, as embodied and broadly described herein, briefly, a universal telescopic louvered panel attachment is provided for enhancing cold aisle and hot aisle passive stack effect cooling efficiency in a data center. The attachment has a panel frame. The frame has a pair of vertical side walls. Each of the side walls, have a front edge, a back edge, and a flange portion. The flange is positioned adjacent to the back edge. Each of the flanges have mounting apertures. The mounting apertures are adapted for receiving a fastener for mounting the panel frame to either one of a computer cabinet or server door. A series of horizontally telescoping blade members are constructed of first and second sheets. Each of the sheets have corresponding parallel laces that slide-by adjacent each other in a horizontal direction. The telescoping blade members have opposite ends which are pivotally connecting the side walls. The blade members are capable of slidably adjusting a width dimension of the frame, and pivoting on a horizontal plane. A vertical tilt bar is pivotally connected to each of the blades. The tilt bar links the blades together so that the blades push to open and close in unison.

Additional advantages of the present invention will be set forth in part in the description that follows and in part will be obvious from that description or can be learned from practice of the invention. The advantages of the invention can be realized and obtained by the invention particularly pointed out in the appended claims.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The accompanying drawings, which are incorporated in and which constitute a part of the specification, illustrate at least one embodiment of the invention and, together with the description, explain the principles of the invention.

FIG. 1 is a front view of the louvered panel in accordance with the present invention.

FIG. 2 is a back view of the louvered panel in accordance with the present invention.

FIG. 3 is a front view of the preferred embodiment of the telescopic blade member assembly.

FIG. 4 is a back view of the telescopic blade member assembly shown in FIG. 3 showing the sheet members slidably extended outwardly to increase the width dimension of the blade assembly to retrofit existing applications.

FIG. 5 is a side view of a panel frame sidewall showing a preferred embodiment of the telescoping blade members, vertical tilt bar, and stop pin receiving holes.

FIG. 6 is an enlarged portion of that view shown in FIG. 3.

FIG. 7 is an isometric view of the preferred embodiment of the present invention when mounted on an anterior portion of a computer server door over a meshed air intake portion of the server door.

FIG. 8 is an isometric view of the preferred embodiment of the system, of the present invention, showing the louvered panel attachment mounted on a row of server doors for directional cooling of those computer servers, when aligned facing a cold aisle raised floor air-grate construction.

FIG. 9 is an isometric view of the preferred embodiment of the system, of the present invention, showing the cold aisle and hot aisle construction of the raised floor assembly, with the louvered panel attachments mounted on the server doors and one the back panels to enhance passive stack effect cooling efficiency in a data center.

FIG. 10 is an isometric view of yet another preferred embodiment of the system, of the present invention, showing use of the louvered panel, duct work and CRAC units to generate the cold aisle and hot aisle barriers in a solid floor assembly.

DETAILED DESCRIPTION OF THE DRAWINGS

Unless specifically defined otherwise, all scientific and technical terms, used herein, have the same ordinary meaning as would be commonly understood by one of ordinary skill in the art to which this invention belongs. In practice, the present invention improves “cold aisle and hot aisle passive stack effect” by generally ensuring that the cold air stays at the server intake, while the computer room air conditioners, or air handlers, receive the warmer exhaust air, improving their stack effect efficiency. Moreover, the invention enhances the “capture of exhaust air” via in-row air conditioners which condition it and return it via the lower plenum and air-grate cold aisle formed with the present invention. The term “lower plenum” means that portion of the computer room below the air-grate floor panels when installed on a pedestal support system. The term “upper plenum” means that portion of the computer room existing above the air-grate floor panels, including the data processing server equipment and in-row air conditioners, or air handling units. Thus, the term “computer room” means the overall air handling environment including the upper and lower plenums from the subfloor to ceiling. Finally, “CRAC units” means those computer room air conditioning units typically located at the perimeter of the data center floor surrounding the (server) racks, or in-rows, to circulate air in the data center space to create a cooling loop. The phrase “stack effect” means the differential in the buoyant density of cooling air relative to the heated exhaust air which drives the passive cooling improvement efficiency in accordance with the present invention.

Although any methods and materials similar or equivalent to those described herein, can be used in the practice or testing of the present invention, the preferred methods and materials are now described. Reference will now be made in detail, to the presently preferred embodiments of the invention, including the examples of which are illustrated in the accompanying drawings. In the drawings, like numerals will be used in order to represent like features of the present invention.

The present invention provides an improved universal telescopic louvered panel attachment 10 for enhancing cold aisle 36 and hot aisle 38 passive stack effect cooling efficiency in a data center. In the presently preferred embodiment, the attachment 10 has a panel frame. The panel frame includes a pair of vertical side walls 4. Each of the side walls 4, have a front edge 5, a back edge, and a flange portion 6. The flange portion 6 is positioned adjacent to the back edges. Each of the 6 have mounting apertures 8. The mounting apertures 8 are adapted for receiving a fastener, such as a rivet, pin, screw or bolt, for mounting the panel frame sidewalk 4 to either one of a computer cabinet 24 or server door 20.

FIGS. 3 and 4 illustrate a preferred embodiment of the blade members 11. There, the panel attachment 10 includes a series of horizontally telescoping blade members 11 constructed of first 1 and second 2 sheets. The first sheet 1 includes top and bottom u-shaped channels, preferably being bend formations, for slidably receiving the smooth outer edges of the second 2 sheet. Each of the sheets 1, 2, have corresponding parallel faces that slide-by adjacent each other in a horizontal direction. The telescoping blade members have opposite ends which are pivotally connecting the side walls 4. The blade members are thus capable of slidably adjusting a width dimension of the frame, and pivoting on a horizontal plane. The width adjustment is predetermined so that the frame fits either within the server door frame 22 or on the back cabinet panel 26. The sidewalls 4 and blade members 11, including first sheet 1 and second sheet 2 are desirably constructed of steel being 1-2 mm in thickness. In this manner, the flange 6 and U-shaped channel of sheet 1 are easily formed by bending.

The panel attachment 10 retrofit solution is a result of the novel feature being the telescopic blade members 11 being the connecting members to the sidewalls 4. In this manner, the overall width installation dimension of the panel frame 10 is adjustable for mounting on either server doors or back panels, within a predetermined range. For example, it Would be desirable to inventory the telescoping panel 10 attachment in sizes having a contraction and expansion capability within ranges of: 20.3-30.5; 27.9-45.7; and 50.8-91.4 centimeters. These ranges are not merely elements of design, but are functionally related to those server door frames 22 sizes which have gained wide acceptance for use in the industry.

A vertical tilt bar 12 is pivotally connected to each of the blades. The tilt bar 12 links the blade member 11 together so that the blade members 11 push to open and close in unison. In this manner, and specifically contemplated herein, the blade members 11 may include manually, or electrically, driven drive linkages (not shown) connected to the tilt bar 12 for operating the blades in a range of positions, between open and closed, depending on the desired setting for the desired air flow rate through the servers, to be cooled. It is also desirably to include either manual or electronic control systems for the thermostatic control of the blade members 11 during operation.

Referring to FIGS. 3 and 4, in the presently preferred embodiment, the blade members 11 may, but need not, include a valley 3, being a bend along their chord axis, which forms a first plane 16 and a second plane 18 being inclined relative to the first plane 16. Moreover, at least one of the side walls 4 includes a series of clear holes drilled in an elliptical array which are adapted to receive at least one stop pin (not shown). When located, the stop pin is capable of retaining the telescoping blade members in a predetermined open and close position. The blade members 11 are preferably constructed of a 1-2 mm thick steel sheet material, whereby the valley between the first face 16 and inclined face 18 is formed as a bend in the sheets 1, and 2.

In use, the foregoing telescopic panel attachment is a component of the system, of the present invention, for improving cold aisle/hot aisle passive stack effect cooling efficiency in a data center. As such, the air-grate floor panels 30 are elements of the system. The air-grate panels 30 include a perforated top plate, having upper and lower surfaces. The top plate is attached to a load bearing sub-frame. The sub-frame typically includes four vertical girders, connected in a ninety-degree alignment, to one another, so that four corners of the frame are capable of supporting the air-grate 30 as an air handling separation barrier on a raised floor pedestal 34 support system. The air-grate 30 is preferably fabricated of a steel plate which is cut, welded, drilled, die-cast, and/or pressed in to subassemblies, or completed panels, in the shop for final finishing, such as powder coating, warehousing, order, and rapid shipment. The top plate includes a plurality of openings which may be circular, but are desirably slotted with a long axis installed to extend perpendicular to the frontal plane of the server cabinet doors when aligned facing the cold aisle.

FIG. 9 illustrates the presently preferred embodiment of the system of the present invention. Here, the system is designed for use on any raised floor pedestal support system which is well known in the art. Such systems typically include a plurality of vertically extending pedestal support members 34. The pedestal support members 34 are typically provided with an upper externally threaded rod, connected to a pedestal support head, and a lower internally threaded tube, connected to a pedestal support base. The pedestal support bases are connected to the subfloor of a raised floor data center building construction. The pedestal supports 34 are each connected in a square, or rectangular, matrix orientation with a plurality of horizontal stringers. The matrix is configured in a predetermined dimension which is consistent with the dimension of the air-grates 30 and solid top panels 33, to be installed on pedestal support heads and stringers. The air-grate floor panels 30 are mounted in a course, or row, on the pedestal heads and stringers so that a cold aisle 36 is formed facing the server doors 20 in a row of data processing servers 24.

The CRAC units 28 are used to remove and return heated air 32, separated in the upper plenum, cool that air, and pressurize the lower plenum with a predetermined volume of the cooling air 31. Heated return air (27° C.) 32, is generated during the operation of the data servers 24 when it is exhausted through the servers 24 and into the hot aisles 38 behind the servers 24. The heated air 32, or return air, flows into the CRAC units 28 which are located in the computer room on top of the raised floor. In this example, the return air 32 is conditioned to 18° C., by the CRAC units 28, and is ducted downwardly into the lower, or under-floor, plenum where it acts to pressurize the lower plenum, causing a positive pressure differential, in relation to the upper plenum portion of the computer room. This pressure differential causes the conditioned cooling air 31 to be forced through the lower plenum, upwards through the slots in the air-grates 30 forming the cold aisle 36 in a direction which impacts the panel attachment 10 blade members 11. The blade members 11 direct or restrict the conditioned cooling air relative to the cold air intake 21. Impact and stratification dynamics, inherent in the use of the novel system disclosed herein, act to cause the cooling air 31 to flow in a direction which continually passes the blade members 11 and frontal intake portions 21 of the server doors 20. As this cooling air 31 passes the front air intake 21 of the server cabinets, the server fans operate to evacuate the conditioned air through the server cabinet 24 where it is heated and exhausted (32° C.) out of the back 28 of the server cabinets 24, and into the hot aisle 38. The hot air 32 exhaust then becomes the make-up return air for recycle through the system.

A computer rack, contains the computer servers 24 within the upper plenum defined by the raised floor. The server cabinets 24 are generally aligned side-to-side in rows with the server doors 20 facing on opposite sides of the air-grate 30 panels which establish a component of the cold aisle 36. Each row may include any stack of servers 24, in racks, as are well known in the art. The computer server cabinets 24 are generally 0.9-3.0 meters tall being a box shaped cabinet. At least one server door 20 is attached to the server cabinet 24 with by hinged positioned along one edge. The server doors 20 include a door frame 22 and a cold air intake 21. The server cabinets 24 also include a ventilated back panel 26, or door. As shown in the drawing figures, the back panels 26, of the server cabinets 23, are oppositely aligned side-to-side in rows facing the solid surface panels 33 to establish hot aisle 38.

In use, the panel attachment 10 is spread to for press-fitment with an inside portion of an existing door 20 frame 22. The blade members 11 are adjusted with tilt bar 12 to a fully open position which reveals mounting apertures 8 in flanges 6 of sidewalls 4. The sidewalls 4 are fastened to the door frame 22 using fasteners, such as a rivet, screw, bolt, or pin, so that the panel attachment overlays to door cooling air intake 21. The blade members 11 are then adjusted to a predetermined position either manually or with direct digital control of the tilt bar 12 assemblies.

Turning now to FIG. 10, where it is shown yet another preferred embodiment of the system, of the present invention, the computer room in constructed with a solid floor and the CRAC units 28 and a ducting system generate an air handling loop relative to the cold aisles 36 and hot aisles 38. The solid floor may, but need not, be constructed as a matrix of substantially solid top raised access floor panels 33 carried on a raised floor pedestal support assembly. Here, the CRAC units 28 are used to evacuate and remove the heated air 32, dissipated through operation of the servers 24 from the hot aisles 38, through a ducting system and recycle the heated air 31 back into the CRAC units 28. The heated air 32 is desirably conditioned by the CRAC units 28 to approximately 18° C., and the conditioned cooling air 31 is then forcibly directed through the ducting system for contained supply into the cold aisle 36. Again, the pressure differentials, established thereby, causes the conditioned cooling air 31 to be forced in a downward direction from the ducting system into the cold aisle 36 where it impacts the panel attachment 10 blade members 11. With this embodiment, the panel attachment is mounted on the server door 20 so that the blade members 11 are operable upwardly to supply conditioned cooling air 11 into the cold air intake portions 21, of the server doors 20. As the cooling air 31 passes the frontal air intake 21 portions of the server doors 20, the server exhaust fans operate to evacuate the conditioned air 21 through the server cabinet 24 where it is thermally dissipated and exhausted our of a ventilated portion in the back panel 26 of the server cabinet 24 into the hot aisle 38.

While the present invention has been described in connection with the illustrated embodiments, it will be appreciated and understood that modifications may be made without departing, from the true spirit and scope of the invention.

Claims

1. A universal telescopic louvered panel attachment for enhancing cold aisle and hot aisle passive stack effect cooling efficiency in a computer room, comprising:

(a) a panel frame, said panel frame having a pair of vertical side walls, each of said side walls, having a front edge, back edge, and a flange portion adjacent to said back edge, wherein said flange includes a plurality of mounting apertures being adapted for receiving a fastening means for mounting said panel frame to either one of a computer cabinet or server door; and

(b) a series of horizontally telescoping blade members, said blade members being a combination including a first sheet and a second sheet, said sheets having corresponding faces adapted to slide-by adjacent each other in a horizontal direction, and whereby said telescoping blade members are pivotally connecting said side walls, at opposite ends thereof, so that said blade members arc capable of slidably adjusting a width dimension of said frame, and pivoting on a horizontal plane within said frame.

2. The telescopic attachment according to claim 1, further comprising a vertical tilt bar pivotally connected to each of said blade members, said tilt bar linking said blade members together so that said blade members operate to open and close in unison.

3. The telescopic attachment according to claim 1, whereby said corresponding faces include a first and a second parallel planes, said second plane being inclined relative to said first plane, said panes being demarcated by a horizontal valley formed therebetween.

4. The telescopic attachment according to claim 1, wherein at least one of said side walls includes an elliptical array of clear holes, said clear holes being capable of receiving at least one stop member, said stop being capable of retaining said telescoping blade members in a predetermined open and close position.

5. A system for enhancing cold aisle and hot aisle passive stack effect in a computer room, comprising:

(a) a cold aisle;

(b) a hot aisle;

(c) an air conditioning and ducting system capable of circulating a cooling airflow in said cold aisle and a heated airflow in said hot aisle;

(d) a row of computer server cabinets, each of said cabinets having an anterior server door, and a back panel, said server doors including a cooling air intake and said back panel adapted for thermal dissipation, said row of said server cabinets being aligned in said computer room so that said server doors are facing said cold aisle and said back panels are facing said hot aisle; and

(e) a louvered panel attachment being mounted on either one of said server cabinet doors or back panels, said louvered panel attachment being a panel frame and a series of horizontally telescoping blade members, said panel frame having as pair of vertical side walls, each of said side walls having a front edge, back edge, and a flange portion positioned adjacent to said back edge, wherein said flange portion includes a plurality of mounting apertures being adapted for receiving a fastening means for mounting said panel frame to either one of said server doors or back panels, said blade members being an assembly including as first sheet and a second sheet having parallel corresponding faces that slide-by adjacent each other in a horizontal direction, whereby said telescoping blade members are pivotally connecting said side walls, at opposite ends thereof, so that said blade members are capable of slidably adjusting a width dimension of said frame, said width dimension being relative for attachment to either one of said cabinet doors or cabinet back panels, whereby said blade members are capable of pivoting on a horizontal plane within said frame.

6. The system according to claim 5, further comprising a vertical tilt bar assembly pivotally connected to each of said blade members, said tilt bar assembly linking said blade members together so that said blades operate to open and close in unison.

7. The system according to claim 5, wherein said computer room includes a raised floor assembly being a matrix of raised floor panels carried on a pedestal support system, said raised floor assembly defining a lower plenum and an upper plenum, and said ducting system further includes a row of air-grate floor panels capable of directing said cooling airflow from said lower plenum into said cold aisle.

8. The system according to claim 5, wherein said air conditioning and ducting system includes a loop comprising a first ducting and a second ducting, said first ducting and said second ducting being positioned in an alternating alignment so that said first ducting is capable of supplying said cooling airflow into said cold aisle and said second ducting is capable of removing said heated airflow from said hot aisle.

9. A method for enhancing cold aisle and hot aisle passive stack effect in a computer room, comprising;

(a) providing a cold aisle;

(b) providing a hot aisle;

(c) providing an air conditioning and ducting system capable of circulating as cooling airflow in said cold aisle and a heated airflow in said hot aisle;

(d) providing a row of computer server cabinets, each of said cabinets having an anterior server door, and a back panel, said server doors including a cooling air intake and said back panel adapted for thermal dissipation, said row of said server cabinets being aligned in said computer room so that said server doors are facing said cold aisle and said back panels are facing said hot aisle;

(e) providing a louvered panel attachment being mounted on either one of said server cabinet doors or back panels, said louvered panel attachment being panel frame and a series of horizontally telescoping blade members, said panel frame having a pair of vertical side walls, each of said side walls having a front edge, back edge, and a flange portion positioned adjacent to said back edge, wherein said flange portion includes a plurality of mounting apertures being adapted for receiving a fastening means for mounting said panel frame to either one of said server doors or back panels, said blade members being an assembly including a first sheet and a second sheet having parallel corresponding faces that slide-by adjacent each other in a horizontal direction, whereby said telescoping blade members are pivotally connecting said side walls, at opposite ends thereof, so that said blade members are capable of slidably adjusting a width dimension of said frame, said width dimension being relative for attachment to either one of said cabinet doors or cabinet back panels, whereby said blade members are capable of pivoting on a horizontal plane within said frame; and

(f) operating said air conditioning and ducting system in combination with the lowered panel attachment to optimize a cold aisle and hot aisle passive stack effect cooling efficiency.

10. The method according to claim 9, further comprising a vertical tilt bar assembly pivotally connected to each of said blade members, said tilt bar assembly linking said blade members together so that said blades operate to open and close in unison.

11. The method according to claim 9, wherein said computer room includes a raised floor assembly being a matrix of raised floor panels carried on a pedestal support system, said raised floor assembly defining a lower plenum and an upper plenum, and said ducting system further includes a row of air-grate floor panels capable of directing said cooling airflow from said lower plenum into said cold aisle.

12. The method according to claim 9, wherein said computer room is a solid floor construction and said air conditioning and dueling system includes a recirculation loop, said loop comprising a first ducting and a second ducting, said first ducting and said second ducting being positioned in an alternating alignment relative to said cold aisles and said hot aisles so that said first ducting is capable of supplying said cooling airflow into said cold aisles and said second ducting is capable of removing said heated airflow from said hot aisle as a make-up air to a computer room air conditioning unit.

13. The method according to claim 10 wherein operating the tilt bar assembly is a direct digital control having a predetermined set-point.