2015 ASHRAE TECHNOLOGY AWARD CASE STUDIES will boost the glycol temperature from 95°F FIGURE 1 Energy recovery dehumidifier with cooling coil that services the ice rink. (35°C) to 105°F (40°C), as required, to mainFree Heat tain comfort in all areas. Pump T T There are 15 HVAC units and two HRVs React In interspersed throughout the complex. All of T React Out React Pump T the air handlers have large close-approach Low Grade Heat coils designed to provide heating with 95°F 70° to 80°F (35°C) glycol and cooling with 50°F (10°C) Humid Air From Rink T Dry Air glycol. In very cold months, the heating glycol To Rink Post Heat Pump T Cooling Pump temperatures will automatically reset to provide sufficient heat. T T Medium Grade Chiller Return With the combination of long compressor Heat 125°F run times and thermal storage, the building heat pumps have an uninterrupted energy the energy recovery loop as the heat source. During the source of 75°F (24°C) and supply 95°F (35°C) heating glycol, while operating with an exceptional COP winter, the hot water is produced at a COP of 4.28 (4.02 adjusted for pump horsepower). of 7.97 (7.49 adjusted for pump horsepower). The ice rink desiccant dehumidifier was custom Domestic hot water for the facility is provided through designed for this facility (Figure 1). It uses a low temtwo stages. The first stage is free heat from the ammoperature desiccant rotor that can be regenerated at nia desuperheating system and ranges from 100°F to 125°F (52°C), versus the traditional gas-fired rotors 120°F (38°C to 49°C). The water is then brought up to that require 275°F (135°C). The system uses two coils in 140°F (60°C) using a hot water heat pump that also uses www.info.hotims.com/54426-5 80 ASHRAE JOURNAL ashrae.org MARCH 2015