REPORT ON A FEASIBILITY STUDY USING TUBE-TYPE HEAT TRANSFER GARMENTS AS THE EVAPORATOR IN VAPOR COMPRESSION MICROCLIMATE SYSTEMS

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Authors
  1. Baggs, G.S.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Carleton Technologies Inc, Orchard Park NY (US)
Abstract
To confirm the feasibility of using tube-type liquid circulating heat transfer garments as the refrigerant evaporator, an experiment was conducted to evaluate the performance of a single circuit of such an evaporating garment using several factors which were varied over a range of conditions. R134a was used as the refrigerant. The experiment was performed as a set of open loop tests; however, to simulate a closed loop system, the boundary conditions, consisting of thermal expansion valve inlet temperature and the evaporator outlet pressure -analogous to condenser outlet temperature and compressor inlet pressure - were precisely controlled. To simulate a worst-case environment, the "condenser outlet" temperature was fixed a 50C (122 degrees F), which - assuming that 5.5C(10 degrees F) temperature gradient would be needed to dissipate the system heat - corresponds to an ambient air temperature of 44C (112 degrees F). The evaporator circuit itself was placed on a garment tank heated at 34C (93 degrees F) to simulate a human torso. The evaporator outlet pressure was varied between 40, 60 and 80 psia. These pressure were chosen because they corresponded to garment outlet temperatures of 0, 10 and 20C.
Keywords
Personal cooling;Liquid circulating garments;Microclimate conditioning;Vapor compression refrigeration
Report Number
DCIEM-96-CR-01;TR96-008-REV-A — Contractor Report
Date of publication
30 Apr 1996
Number of Pages
90
DSTKIM No
96-02899
CANDIS No
498756
Format(s):
Document Image stored on Optical Disk;Hardcopy

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