"Hot" for warm water cooling

Coles, Henry; Ellsworth, Michael; Martinez, David

doi:10.1145/2063348.2063371

Cited by 16 publications

(7 citation statements)

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“…As a result, the temperature in the rack circuit increases until it goes above 55 • C/131 • F and the chiller turns on. 2 What happens then depends on the temperature dependence of the function P max d (T ) = P max c (T )/COP(T ), which is the maximum power that can be removed from the driving circuit of the chiller. This function depends on the parameters of the chiller.…”

Section: Water Inletmentioning

confidence: 99%

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iDataCool: HPC with Hot-Water Cooling and Energy Reuse

Meyer

Ries²,

Solbrig

et al. 2013

Lecture Notes in Computer Science

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iDataCool is an HPC architecture jointly developed by the University of Regensburg and the IBM Research and Development Lab B\"oblingen. It is based on IBM's iDataPlex platform, whose air-cooling solution was replaced by a custom water-cooling solution that allows for cooling water temperatures of 70C/158F. The system is coupled to an adsorption chiller by InvenSor that operates efficiently at these temperatures. Thus a significant portion of the energy spent on HPC can be recovered in the form of chilled water, which can then be used to cool other parts of the computing center. We describe the architecture of iDataCool and present benchmarks of the cooling performance and the energy (reuse) efficiency.Comment: 12 pages, 7 figures, proceedings of ISC 201

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Section: Water Inletmentioning

confidence: 99%

“…A discussion of various aspects of liquid cooling with focus on high coolant temperatures can be found in Refs. [2,3]. For the following discussion, we assume that the cooling medium is water and define what we mean by "warm water" and "hot water".…”

Section: Introductionmentioning

confidence: 99%

iDataCool: HPC with Hot-Water Cooling and Energy Reuse

Meyer

Ries²,

Solbrig

et al. 2013

Lecture Notes in Computer Science

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“…For each of these one can consider keeping the primary cooling fluid temperature either close to room temperature or significantly above room temperature (warm water cooling [289]). When the primary cooling fluid is significantly above environmental conditions, then seasonal temperature changes have negligible effects on efficiency of conversion of heat for other uses and the generated heat can be more effectively recycled.…”

Section: Overview Of Data Center Cooling Methodologiesmentioning

confidence: 99%

Energy aware ultrascale systems

Oleksiak

Lefèvre

Alonso

et al. 2019

Ultrascale Computing Systems

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Thus, in green data centres aimed for high-performance computing, it is advantageous to use some form of direct liquid cooling instead of pure air cooling, since this would enhance the opportunity to reuse the waste heat more effectively and, simultaneously, increase the usage of the CPU turbo mode (Gepner et al, 2010). The thermal capacity of liquids is noticeably larger than that of air -air 1.00 kJ/(K·kg) and water 4.18 kJ/(K·kg), for instance -and after the heat energy has been transferred to water, it can be removed from the data centre efficiently (Coles et al, 2011). Moreover, for green data centres, water is usually the preferred liquid, because it is non-toxic, as well as more available and less expensive than other types of liquid.…”

Section: Solutions For Liquid Coolingmentioning

confidence: 99%

Direct-to-chip liquid cooling for reducing power consumption in a subarctic supercomputer centre

Ovaska

Dragseth

Hanssen

2016

IJHPCN

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Reduction of data centre power consumption is a timely challenge. Waste heat reuse is another focus area when developing energy efficient and sustainable data centres. And these two issues are interconnected through liquid cooling of server racks and/or direct-to-chip liquid cooling. Both of these solutions make it possible to transfer a significant proportion of the waste heat energy back to profitable use. Nevertheless, the heat reusing opportunity is not the only benefit direct-to-chip liquid cooling may offer. Another benefit is the notable reduction of power consumption related to cooling fans associated with server blades and rack-level cooling systems. To evaluate this benefit, we performed power consumption and performance measurements in a subarctic supercomputer centre hosting a cluster of 632 blade nodes. Our study concentrated on a 47-node subset that we analysed when the servers were executing the LINPACK benchmark. Our conclusion is that direct-to-chip liquid cooling can reduce the total power consumption, in this case, up to 14.4% depending on the inlet air temperature.Keywords: data centre; direct-to-chip liquid cooling; power consumption; subarctic climate; supercomputer; waste heat reuse.Reference to this paper should be made as follows: Ovaska, S.J., Dragseth, R.E. Roy E. Dragseth holds a Master's degree in Applied Mathematics from the University of Tromsø (UiT), and has worked with system administration and user support in the HPC Services at UiT for nearly 15 years. He has been the main system architect behind the last three generations of HPC systems deployed at UiT, and was deeply involved in the design of the current 0.5 MW HPC data centre. Currently, he is working on the final design of the new 2 MW data centre under construction.Svenn A. Hanssen holds a

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"Hot" for warm water cooling

Cited by 16 publications

References 0 publications

iDataCool: HPC with Hot-Water Cooling and Energy Reuse

iDataCool: HPC with Hot-Water Cooling and Energy Reuse

Energy aware ultrascale systems

Direct-to-chip liquid cooling for reducing power consumption in a subarctic supercomputer centre

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