一个可利用低品位热能的双级除湿冷却式空调系统

A Two Stage Desiccant Cooling System Using Low Temperature Heat

本文建立了一个可利用低品位热能的双级除湿冷却式空调系统及其数学模型，并用该模型模拟香港一办公楼作为新风系统的除湿冷却式空调系统。计算机模拟结果显示：双级系统所需的再生温度仅为５９．０℃，较单级系统低２４．２℃，这使得低品位热能的利用成为可能；双级除湿冷却式空调系统可提供湿度足够低的送风，以承担全部湿负荷，故该系统可以很好地与冷幅射天花板系统配合使用，从而实现显热与潜热的分别处理，提高温湿度的控制精度；而且由于机械制冷仅仅被用于消除显热，所以可以提高制冷系统的蒸发温度从而提高制冷系统的性能系数。

Abstract In this presentation ,a two stage desiccant cooling system using low temperature heat is described and the computer model is built.The desiccant cooling system used in an office building in Hon Kong as a ventilation system is computer simulated.The computer calculations show that lower regeneration temperature will be required as compared with a single stage desiccant cooling system,which makes low temperature heat utilization possible.It is also demonstrated that a two stage desiccant cooling system can provide adequate moisture control for hot and humid climates,so the system can match a cooled ceiling system well.Therefore,Humidity and temperature of indoor air can be controlled separately.In addition,only sensible cooling is performedby mechanical refrigerating system,so the higher evaporating temperature is required and consequently the coefficient of performance,COP,of mechanical refrigerating system will be higher.