Accession Number : ADA319219

Title :   Thermal Evaluation of Piping Components Used in a Commercial Underground Heat Distribution System.

Descriptive Note : Final rept.,

Corporate Author : CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL

Personal Author(s) : Marsh, Charles P. ; Streibich, Matthew W.

PDF Url : ADA319219

Report Date : OCT 1996

Pagination or Media Count : 74

Abstract : Super Temp-Tite heat distribution piping is the only product of its design type approved by the Federal Agency Committee for Underground Heat Distribution Systems. This system employs a water spread limiting (WSL) design to restrict any leakage to a single segment of piping. WSL systems are intended to withstand continuous carrier medium temperatures of up to 450 deg F. On the basis of approval by the Federal Agency Committee for use at Class B, C, and D sites, the Super Temp-Tite WSL design is currently approved for the same applications by the Army Corps of Engineers. Recently the system manufacturer asked the Federal Agency Committee to approve use of its system at Class A sites - those with the harshest conditions. The U.S. Army Construction Engineering Research Laboratories (USACERL) was tasked to conduct mathematical modeling and simulations to help determine whether Super Temp-Tite meets the technical specifications for Class A applications. It is concluded that the polyurethane foam insulation in this WSL design would be exposed to temperatures well exceeding conservative design values, both in Class A applications and for operating temperatures below 350 deg F. Consequently, the system as now designed is not recommended for approval by the Federal Agency Committee.

Descriptors :   *MATHEMATICAL MODELS, *FEASIBILITY STUDIES, *COMMERCIAL EQUIPMENT, *PIPING SYSTEMS, *HEAT PIPES, *UNDERGROUND FACILITIES, *HEAT TRANSMISSION, TEST AND EVALUATION, THERMAL PROPERTIES, TEMPERATURE, THICKNESS, WATER FLOW, MANUFACTURING, EXPOSURE(GENERAL), SPECIFICATIONS, WATER, INSULATION, SITES, THERMAL ANALYSIS, ARMY CORPS OF ENGINEERS, LEAK DETECTORS, POLYURETHANE RESINS, EXPANDED PLASTICS.

Subject Categories : Air Condition, Heating, Lighting & Ventilating
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE