U. S. Environmental Protection Agency, Contracts Management Division (MD-33), Attn: ORDSC, Research Triangle Park, NC 27711

R -- FLOW OPTIMIZATION BY COMPUTATIONAL FLUID DYNAMICS MODELING SOL HCB119 DUE 090399 POC Diane L. Pierce, Contract Specialist, (919) 541-3416 The U.S. Environmental Protection Agency (EPA) intends to negotiate on a sole source basis with North Carolina State University (NCSU), Dept. of Mechanical/Aerospace Engineering, 3211 Broughton Hall, Campus Box 7910, Raleigh, NC 27695-7910. This sole source procurement involves evaluating air flow distribution problems in a Rochester exposure chamber through computational fluid dynamics (CFD) modeling. This chamber is located at the EPA Human Studies Facility (HSF) on the campus of the University of North Carolina at Chapel Hill (UNC). Air flow measurements conducted in the unmodified Rochester human exposure chamber have revealed a highly non-uniform velocity distribution. EPA, with the support of NCSU, has conducted a number of investigations which include CFD modeling. Services provided through this procurement shall be to optimize the configuration of both a deflector plate used to redistribute the incoming air flow, and the location of the test subject within the Rochester chamber to achieve both reliable and reproducible pollutant exposures under all reasonable chamber operating scenarios. An additional goal of this procurement is to determine the effect of thermal gradients due to subject-generated heat on inhaled pollutant concentrations. The recipient of this work, therefore, must have extensive experience in three areas: (1) flow visualization and pressure drop experiments in a Rochester human chamber or scale model chamber; (2) temperature, velocity, and CO tracer gas measurements in a full-scale Rochester human chamber; and (3) computational fluid dynamics modeling. The period of performance is expected to be from date of award through December 10, 1999. No solicitation is available. This notice of intent is not a request for competitive proposals. All interested parties must identify their interest and capability to respond to the requirement or submit proposals within 15 days of the date of this announcement. A determination by the Government not to compete with this proposed contract based upon responses to this notice is solely within the discretion of the Government. Information received will be considered solely for the purpose of determining whether to conduct a competitive procurement. Interested vendors shall: (1) include information on the proposed services which clearly supports the requirements outlined above and; (2) provide itemized pricing that is sufficient to make a determination that competition is feasible. Submit responses to the U.S. EPA, Attn: Diane L. Pierce (MD-33), Contracts Management Division, Research Triangle Park, NC 27711 within 15 days. No telephone requests will be honored. See also numbered Note 26. Posted 08/20/99 (W-SN370565). (0232)

Loren Data Corp. http://www.ld.com (SYN# 0073 19990824\R-0001.SOL)