Title:
Waste heat recovery in data centers: ejector heat pump analysis

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dc.contributor.advisor Joshi, Yogendra
dc.contributor.author Harman, Thomas David, V en_US
dc.contributor.committeeMember Ghiaasiaan, S. Mostafa
dc.contributor.committeeMember Jeter, Sheldon M.
dc.contributor.department Mechanical Engineering en_US
dc.date.accessioned 2009-01-22T15:48:47Z
dc.date.available 2009-01-22T15:48:47Z
dc.date.issued 2008-11-24 en_US
dc.description.abstract The purpose of this thesis is to examine possible waste heat recovery methods in data centers. Predictions indicate that in the next decade data center racks may dissipate 70kW of heat, up from the current levels of 10-15kW. Due to this increase, solutions must be found to increase the efficiency of data center cooling. This thesis will examine possible waste heat recovery technologies which will improve energy efficiency. Possible approaches include phase change materials, thermoelectrics, thermomagnetics, vapor compression cycles, absorbtion and adsorbtion systems. After a thorough evaluation of the possible waste heat engines, the use of an ejector heat pump was evaluated in detail. The principle behind an ejector heat pump is very similar to a vapor compression cycle. However, the compressor is replaced with a pump, boiler and an ejector. These three components require less moving parts and are more cost effective then a comparable compressor, despite a lower efficiency. This system will be examined under general operating conditions in a data center. The heat load is around 15-20kW and air temperatures near 85°C. A parametric study is conducted to determine the viability and cost effectiveness of this system in the data center. Included will be various environmentally friendly working fluids that satisfy the low temperature ranges found in a data center. It is determined that Ammonia presents the best option as a working fluid for this application. Using this system a Coefficient Of Performance of 1.538 at 50°C can be realized. This will result in an estimated 373,000 kW-hr saved over a year and a $36,425 reduction in annual cost. Finally, recommendations for implementation are considered to allow for future design and testing of this viable waste heat recovery device. en_US
dc.description.degree M.S. en_US
dc.identifier.uri http://hdl.handle.net/1853/26594
dc.publisher Georgia Institute of Technology en_US
dc.subject Ejector en_US
dc.subject Heat pump en_US
dc.subject Waste heat en_US
dc.subject Data center en_US
dc.subject.lcsh Heat recovery
dc.subject.lcsh Waste heat
dc.subject.lcsh Ejector pumps
dc.subject.lcsh Data processing service centers
dc.title Waste heat recovery in data centers: ejector heat pump analysis en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Joshi, Yogendra
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 63ef328b-076b-44b7-92a9-0f7dd03fa1fa
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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