THERMOPHYSICAL PROPERTIES OF HUMID AIR （湿空气的热物理性质）.pdf

THERMOPHYSICAL PROPERTIES OF HUMID AIR Models and Background M. CONDE ENGINEERING, 2007 Disclaimer This document reports results of our own work, based on results published by others, in the open literature. The author, his firm, and his associates assume no responsibility whatsoever regarding whatever consequences, direct or implied, that may result from their use or misuse. In no circumstances shall the author, his firm, and his associates be made liable for any losses of profit, or other commercial damages, including, but not limited, to special, incidental, consequential or other damages. © M. Conde Engineering, Zurich 2007 M. CONDE ENGINEERING — 2007 Properties of Working Fluids - Moist Air 1 / 22 Fluid Properties The models of the components used in HVAC equipment and plants require the knowledge of a large number of thermodynamic and transport properties of the fluids they handle. In a model conceived for design purposes those properties must be calculated for real fluids, as stressed by Black (1986). The fluids used may be undergoing a cyclic process, such as the operating fluid in a chiller or heat pump, or may be totally or partially recirculated as the source and sink fluids, mostly humid air, water or a brine. The thermodynamic and transport properties of operating fluids are required for the liquid and the vapour phases, and for the two-phase liquid-vapour region as well. Water and brine properties are mostly necessary for the liquid phase, although solid water (frost and ice) properties may as well be required when the source fluid is atmospheric air, or an ice producing heat pump. This document describes the equations necessary for the calculation of the thermophysical (thermodynamic + transport) properties of moist air i