THERMOSYPHON DEVICES AND SLAB-ON-GRADE FOUNDATION DESIGN. FINAL REPORT
Subgrade cooling methods to prevent thermal degradation of permafrost in cold regions include the use of thermosyphons with inclined evaporator sections. This laboratory study was conducted to determine the thermal performance characteristics of two commercially available thermosyphons. Evaporator inclination angles ranged from 0 to 12 degrees from the horizontal, and air speeds ranged from 0 to 13.4 miles per hour over the finned condenser sections. Two standard full size thermosyphons, one charged with carbon dioxide and the other with anhydrous ammonia, were tested in CRREL's atmospheric wind tunnel. Empirical expressions are presented for heat removal rates as a function of air speed, ambient air temperature and evaporator inclination angle. An analytical method is also presented to approximate thermal design of foundations using thermosyphons under buildings with a slab-on-grade. Heat gains from the slab and pad to the thermosyphon as well as the evaporator temperature are presented as functions of time.
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Corporate Authors:
Alaska Department of Transportation and Public Facilities
2301 Peger Road
Fairbanks, AK United States 99701 -
Authors:
- Zarling, J P
- Haynes, F D
- Publication Date: 1985-6
Media Info
- Features: Figures; References; Tables;
- Pagination: 72 p.
Subject/Index Terms
- TRT Terms: Cooling systems; Evaporators; Foundations; Permafrost; Slab on grade; Soil stabilization; Subgrade (Pavements)
- Old TRIS Terms: Foundations (Structures); Slab on ground construction; Subgrade treatments; Thermosyphon devices
- Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Pavements; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 00460382
- Record Type: Publication
- Report/Paper Numbers: AK-RD-86-16, E85.23
- Files: TRIS, STATEDOT
- Created Date: Dec 31 1986 12:00AM