Full Description

Cold air/water HVAC systems [40°F (4.4°C)] have been developed for use with ice thermal storage because (1) they require one-third to one-half as much primary air as 40°F(4.4°C) all-air HVAC systems, (2) they control humidity and temperature separately and thus can be applied in a much broader range of facilities without overdrying the air, and (3) they are lower in both first cost and energy cost than the all-air systems, making ice storage equipmenat more practical option. This paper describes 40°F (4.4°C) air/water VAV systems and compares the following HVAC systems in terms of electric demand (day vs. night), energy usage, energy cost, and first cost: