2012 Technology Award Case Studies Photo 1: Concrete poured over new copper tube network. Photo 2: CO2 ice rink chiller package. on the shortest side. Insulated copper manifold are made with heavy wall 2 1/8 in. OD. The Marcel Dutil Arena project retrofitted an existing ice mat, and the trench for the distribution manifolds was on the longest side of the rink. For this reason, a four-pass tubing configuration with tubes installed on the shortest side was done. The distribution manifolds were installed in reversed return configuration with no balancing valves on the longest side of the rink. This is the first time this configuration has been used in a CO2 application. www.info.hotims.com/38000-65 40 ASHRAE Journal March 2011