Cold-plate using internal extruded liquid channel paths

Posted on September 8, 2012 by

ARLINGTON HEIGHTS, ILLINOIS, USA, Friday, September 7, 2012: Hill Tech Sales, a leader in Components for Thermal Management and Electrical Power Conversion today posted information on cold-plate using internal extruded liquid channel paths.

Extruded liquid channel base, gasket and manifold

This is a construction example showing the extruded liquid channel base, with gasket interface and manifold connections

 

Typical flow path in cold plate, aluminum heat sink, manifolds show on edge of chiller plate

Choose among these four standard extruded liquid channel aluminum heat sink bases, in order to create your own custom configuration. Liquid cooled cold-plate can be up to 60 inches long.

This is a highly advanced, dependable liquid cooling technology utilizing internal liquid channels extruded into the cold-plate. No longer is expensive drilling and fabricated processes required. This extrusion technology overcomes past size limitations and comes in four standard sizes; lengths up to 60 inches!

Standard extruded channel alumium heat sink bases, cold-plate.

Standard extruded channel aluminum heat sink bases, liquid cooled cold-plate.

These can be configured in a number of parallel and series flow options provide an optimal thermal solution. The liquid channels locations were determined in order to accommodate almost all power semiconductors.  In addition, we can enhance thermal performance by using specifically designed turbulators which increase the flow rate in the fluid channel with only a minute increase in back pressure. Custom designed can a provided for specific thermal challenges.

We also provide other advanced thermal dissipation solutions:

  • VBA – Vacuum brazed cold-plate assemblies
  • Friction Stir Welding for air-cooled and liquid cooled cold plates
  • Copper cold plates
  • Heat pipes for High power industrial use: 30kW + heat pipe assemblies
  • Heat exchangers
  • Air-cooled bonded fin
  • Air-cooled pressed fin

 For more questions on this article contact:

Andrew Hill
Hill Technical Sales
216 West Campus Drive
Arlington Heights, IL 60004   
Tel: +1- 847-255-4400  ext 12
Fax: +1-847-255-0192    

You may also visit: http://www.hilltech.com/

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Large-scale industrial heat pipes for power electronic applications

Posted on August 31, 2012 by
Heat-pipe spreading in bonded fin heat sink

Heat moved evenly from devices to fins on outter edge of heat sink

ARLINGTON HEIGHTS, ILLINOIS, USA, Friday, August 31, 2012: Hill Tech Sales, a leader in Components for Thermal Management and Electrical Power Conversion today posted information on standard heat pipes to increase working size in a cold plate.

In the past engineers would not consider heat pipes for high power, power electronic applications for many reasons:

  • Low maximum heat energy transfer capacity – only 70 watts – 8mm tube OD.
  • Low temperature operation, (below the freezing point of water.
  • Limited working distance of 30 cm.

 

Heat Pipe spreading in a bonded fin heat sink

 With new heat pipe advancements tube OD’s of greater than 16mm can be built, allowing for heat energy transfer in the kilowatts, assemblies with capacity of 32kW or more can be made.

Other innovations include:

  • Antigravity Heat pipes with temperature ratings of +5 to +275 C
  • LTSC – low temperature Heat pipes with temperature ratings ·40 to +30″C
  • Diode type for heat transfer primarily in one direction
  • Variable conductive Heat pipes for self regulation and automatic temperature control
  • Flat profile for heat spreaders
  • Loop Heat pipes

Heat pipes in a heat exchanger assembly provide heat transfers with no pumps are moving mechanical parts adding to system reliability.

 Enhancing thermal spreading in high energy density regions can be addressed by using the flat profile heat pipes and fabricating them, stacked side by side in an assembled plate. Since the heat pipes themselves are rather inexpensive, it is good design practice to add additional pipes to improve your design margin.

 Note another inherent advantage in this concept is that this assembly now has improved built-in reliability through redundancy of heat transfer devices in the unlikely event of a single heat pipe failing.

For more questions on this article contact:

Andrew Hill
Hill Technical Sales
216 West Campus Drive
Arlington Heights, IL 60004   
Tel: +1- 847-255-4400  ext 12
Fax: +1-847-255-0192    

You may also visit: http://www.hilltech.com/

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Standard heat pipe to increase working size in cold plate

Posted on January 15, 2010 by

ARLINGTON HEIGHTS, ILLINOIS, USA, Friday, January 15, 2010: Hill Tech Sales, a leader in Components for Thermal Management and Electrical Power Conversion today posted information on standard heat pipes to increase working size in a cold plate.

Most times engineers will look at the standard 30cm length of heat pipe and dismiss using it in an application because their working distance is beyond 30 cm. The same occurrence also applies to heat dissipation being over the rating of a single heat pipe.

Heat Pipe interleave in a cold plate

Heat Pipe interleave in a cold plate

 Both of these issues can easily be addressed by using a properly designed heat pipe assembly. The first issue of length is easily addressed by interleaving heat pipes in a plate assembly with a nominal amount of overlap, in many cases 2 to 3 cm.

 The second issue of enhancing thermal dissipation can be addressed by using the round heat pipes in a flattened state, stacking them side by side in an assembled plate. Since the heat pipes themselves are rather inexpensive, it is good design practice to add additional pipes to improve your design margin.

 Note another inherent advantage in this concept is that this assembly now has improved built-in reliability through redundancy of heat transfer devices in the unlikely event of a single heat pipe failing.

For more questions on this article contact:

Vince Hill
Hill Technical Sales
216 West Campus Drive
Arlington Heights, IL 60004   
Tel: +1- 847-255-4400  ext 12
Fax: +1-847-255-0192    

You may also visit: http://www.hilltech.com/

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Meeting contract flow down % goals with transformer supplier for: Small HUBZone business, and women-owned small business

Posted on January 11, 2010 by

ARLINGTON HEIGHTS, ILLINOIS, USA, Monday, January 11, 2010: Hill Tech Sales, a leader in Components for Electrical Power Conversion today posted information on meeting contract flow down percentage goals with Transformer supplier for: Small disadvantaged business, Small HUBZone business, and women-owned small business.

Large companies, when awarded a Federal government contract, may need to adopt a similar plan for themselves and their subcontractor, since the subcontracting plan is normally incorporated into awarded contract.

A lot of times it is difficult finding high quality reliable suppliers of transformers / inductors and still meet the flow down plans distinct goals for small, small disadvantaged, small HUBZone, WOB (women-owned small), veteran-owned small, and service-disabled veteran-owned small businesses.

We have selected unique companies that meet the high quality standards required by todays large firms for specialty transformers / inductors / CT’s (Current Transformers) / and PT’s, and also allow you to meet your flow down requirements for WOB and small business.

The flow-down process is intended to ensure that all small businesses receive “maximum practicable opportunity” to perform on Government contracts and subcontracts in accordance with public laws, regardless of the subcontracting tier.

Note:  the risk is that if a contractor fails to make a good faith effort to achieve the goals in its subcontracting plan, may be found in material breach of the contract and terminated for default.

Small business and WOB also a have advantages in terms of Subcontracting reports that are required by larger firms; Individual Subcontracting Report (ISR) and Summary Subcontracting Report (SSR).

Let us help you meet your small HUBZone, WOB (women-owned small business) flow down requirements.

For more questions on this article contact:

Alena Kamin
Customer Service Manager
Hill Technical Sales
216 West Campus Drive
Arlington Heights, IL 60004  
Tel: +1- 847-255-4400  ext 12
Fax: +1-847-255-0192   

You may also visit: http://www.hilltech.com/

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Class II LED Power Supplies with 277 VAC input

Posted on January 8, 2010 by

ARLINGTON HEIGHTS, ILLINOIS, USA, Friday, January 08, 2010: Hill Tech Sales, a leader in LED Components and Components for Electrical Power Conversion today posted information on 277VAC input rated LED Drivers for Class II outdoor lighting.

When using LED lighting in new installations LED drivers/LED power supplies with  standard universal input of 90 ~ 264VAC are not an issue since you can specify the specific voltage needed up front.

However, in many existing buildings that have dedicated electrical panels for lighting these are rated at 277VAC. In these installations LED lighting is typically not replacing all of the existing lighting. This means in these in cases in order to use these LED drivers you need a new circuit to supply 120VACVAC and a step down transformer to reduce the voltage from 277 to 120VAC.

New Class II LED Power Supplies are now coming on the market with wide ranging universal input of 90 – 277VAC which can be used on existing 277VAC lighting circuits with no voltage modification required.

Other features now standard on most LED Drivers are:

  • Highly Efficient Switching-Mode Technology
  • Active PFC (Power Factor Corrected)
  • Built For Outdoor Wet, Damp or Indoor Dry Applications
  • Silicone Encapsulated for Wet Locations (Use UL approved Water-Tight Conduit and Fittings)
  • Built-in EMI Filter for Low Noise
  • Rugged Rain-Proof Aluminum Extruded Case – IP65 Rated
  • Over-Current and Over-Voltage Protection with Auto-Recovery
  • Output Voltage Adjustable.

For adverse environments it also important to look for LED Drivers rated at 70°C at full load. Many LED Power supply de-rate to as little as 50% of rated power at 50°C.

For more questions on this article contact:

Vince Hill
LED Specialist
Hill Technical Sales
216 West Campus Drive
Arlington Heights, IL 60004   
Tel: +1- 847-255-4400  ext 12
Fax: +1-847-255-0192    

You may also visit: http://www.hilltech.com/

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