CLIMATE APPROPRIATE COOLING FOR A GROCERY STORE: HYBRID UNITARY DOAS SYSTEM IN SAN RAMON, CA
This report documents a field evaluation of the Munters EPX 5000 installed at a grocery store in San Ramon, CA. The technology studied is an indirect evaporative and vapor compression hybrid dedicated outside air supply (DOAS) system.
This study was performed after a lab assessment of the unit in at PG&E's Applied Technical Services facilities in San Ramon, CA, in collaboration with the Western Cooling Efficiency Center at UC Davis, and in parallel and/or in sequence with four other studies, all of which assessed the performance of RTUs that employ evaporative technologies in different ways or configurations. These studies include:
• A lab assessment of four direct evaporative condenser pre-coolers, and one air supply indirect evaporative pre-cooler.
• A field assessment at a big box retail store and grocery in Bakersfield, CA of indirect evaporative cooling units from two different manufacturers applied as retrofits to existing RTUs:
• A field assessment of indirect evaporative cooling for a mall in Fairfield, CA in which a new RTU was retrofitted with a direct evaporative pre-cooler at the condenser inlet, and a water to air heat exchanger at the ventilation air inlet.
• A field assessment of an indirect evaporative unit, serving as a dedicated outside air supply (DOAS) at a restaurant in Rocklin, CA.
• The lab assessment of the Munters hybrid unitary dedicated outside air supply (DOAS) system.