[+] Author and Article Information
Lincan Yan

626 Cochrans Mill Rd Building 153 Room 201B Pittsburgh, PA 15236 jjy9@cdc.gov

David Yantek

626 Cochrans Mill Rd Pittsburgh, PA 15236 dyantek@cdc.gov

Timothy Lutz

626 Cochrans Mill Road Pittsburgh, PA 15236 tcl9@cdc.gov

Jeffrey Yonkey

626 Cochrans Mill Road Pittsburgh, PA 15236 vex7@cdc.gov

Justin Srednicki

626 Cochrans Mill Road Pittsburgh, PA 15236 gle2@cdc.gov

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received February 2, 2018; final manuscript received July 2, 2019; published online xx xx, xxxx. Assoc. Editor: Samuel Sami.

ASME doi:10.1115/1.4044345 History: Received February 02, 2018; Accepted July 02, 2019


One of the main concerns with the use of both portable and built-in-place (BIP) RAs, especially for hot or deep mines, is the interior temperature rise due to the occupants' metabolic heat and the heat released by devices such as the carbon dioxide (CO2) scrubbing system. The humidity within the RA will also increase through occupants' respiration and perspiration, and from the chemical reaction within the CO2 scrubbing system. Heat and humidity buildup can subject the occupants to hazardous thermal conditions. To protect RA occupants, Mine Safety and Health Administration regulations mandate a maximum apparent temperature of 95°F within an occupied RA. The National Institute for Occupational Safety and Health (NIOSH) tested both an air conditioned borehole air supply (BAS) and a cryogenic air supply for RAs in the NIOSH Experimental Mine in Bruceton, PA. The BAS was tested on a 60-person BIP RA, while the cryogenic air supply was tested on a 30-person BIP RA and a portable 23-person tent-type RA. Multiple tests were conducted with both air supplies to assess their ability to cool RAs. The test results show that the BAS and the cryogenic air supply were able to maintain the apparent temperature within the tested RAs under the 95°F limit. The BAS and the cryogenic air supply are potential RA heat mitigation strategies that mines could use to prevent heat/humidity buildup within RAs.

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