30 May 2005

STRATEGIES FOR THE LARGE-SCALE APPLICATION OF WATERWATER-LOOP HEAT- PUMP AIR-CONDITIONING SYSTEMS IN CHINA


A water-loop heat pump air-conditioning (WLHPAC) system is energy efficient and
environmentally friendly. However, the lack of internal cooling load, inadequate internal space, and/or
little surplus heat gain in most buildings restrict it from being widely used in China. This paper discusses
a number of strategies, based on the use of external low-grade heat sources, for the possible large-scale
implementation of WLHPAC systems may become possible in China. A number of different types of
low-grade heat sources available and their characteristics are discussed, as well as the strategies to use
these low-grade heat sources in WLHPAC systems, with appropriate schematic illustrations. Compared to
a conventional WLHPAC system, one that uses low-grade sources will be more energy efficient tand
therefore more environmentally friendly.