Evaporative-pad heat transfer performance in a simulated waste-heat environment

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Greenhouse uses of low-grade waste heat have been investigated at the Oak Ridge National Laboratory (ORNL) for a number of years. These investigations have focused on evaporative-pad concepts that are capable of providing both summer cooling and winter heating. As part of this program, performance testing of potential evaporative-pad materials has been performed at ORNL. Results of an experimental investigation of the performance of CELdek packing under simulated waste heat greenhouse conditions are reported. The objective of this study was to characterize the air heating capability of the material as well as its air cooling ability. A cooling efficiency of ... continued below

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Pages: 26

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Olszewski, M January 1, 1979.

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Description

Greenhouse uses of low-grade waste heat have been investigated at the Oak Ridge National Laboratory (ORNL) for a number of years. These investigations have focused on evaporative-pad concepts that are capable of providing both summer cooling and winter heating. As part of this program, performance testing of potential evaporative-pad materials has been performed at ORNL. Results of an experimental investigation of the performance of CELdek packing under simulated waste heat greenhouse conditions are reported. The objective of this study was to characterize the air heating capability of the material as well as its air cooling ability. A cooling efficiency of 85 to 95% was achieved for adiabatic saturation operation. For nonadiabatic saturation conditions, air cooling in excess of 11/sup 0/C can be achieved if the inlet air wet bulb depression is 15/sup 0/C. When the wet bulb depression is decreased to 7.8/sup 0/C, air cooling in excess of 5.6/sup 0/C is achievable. The results also indicate that CELdek is effective in the heating mode. Energy transport was found to be strongly dependent on water flow rate. Air side pressure drop was found to vary linearly with face velocity and varied from 10.2 to 28.1 Pa over a face velocity range of 1.3 to 2.6 m/sec. The pressure drop was also found to be independent of water flow rate up to the limit (8.4 x 10/sup -4/ m/sup 3//s/m of pad length) tested.

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Pages: 26

Notes

Dep. NTIS, PC A03/MF A01.

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  • 18. ASME national heat transfer conference, San Diego, CA, USA, Aug 1979

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  • Report No.: CONF-790808-15
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 5998657
  • Archival Resource Key: ark:/67531/metadc1098810

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1979

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 11, 2018, 2:35 p.m.

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Olszewski, M. Evaporative-pad heat transfer performance in a simulated waste-heat environment, article, January 1, 1979; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1098810/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.