Abstract
In the first report we studied the energy savings of VAV systems in interior zone. In this report we calculated cooling and heating coil load, power input to fan and fan load of air conditioning systems in perimeter zone. The systems which were selected were variable air volume system, dual duct system, 2-pipe and 4-pipe induction unit system. As to VAV systems we studied systems: One system was the typical VAV system which handled transmission loads with CAV and solar and interior space loads with VAV, the other-VAV dual duct system which mixed cold air and warm air stream at partial loads. The heating and cooling loads by hour for 365 days of year were caluculated by HASP/ACLD 7101 and the standard meteorological data in Tokyo of SHASE. As a result, compared with CAV dual duct system the cooling load of the typical VAV system was 66% in usual system, 56% by employing air-to-air heat exchanger and 50% by using the exchanger and free cooling. And the load of the VAV dual duct system was minimum in perimeter systems. Concerning the power input to fan, VAV system was 50% in damper control, 37% in inlet vane control, and 20% in speed control compared with CAV system.
