一些暖通空调工程计算，如实时仿真和控制系统模型，需要简单而精确的方程来估计性能。由于可用的最简单模型在感兴趣的变量v、h和s接近零时误差较大，且最精确的模型计算是迭代和冗长的，因此开发了一个简单但精确的模型。基于增强因子和压缩因子随温度和压力的多项式曲线拟合，描述了该模型，并计算了其参数。 在-40°C至50°C（-40°F至122°F）和77.059至101.325 kPa（11.176至14.695 psia）的规定范围内，模型预测误差在最精确模型的±0.2%以内。这些数据对应于ASHRAE湿度图1、2、5、6和7中的数据。单位:双引文:ASHRAE交易，第113卷，第。2.

Some HVAC engineering calculations, such as real-time simulations and control system models, need simple and precise equations for properties estimation. Since the simplest model available has large errors as the variables of interest, v, h, and s, approach zero and the most precise model calculations are iterative and lengthy, a simple but precise model was developed.This model, based on polynomial curve fits of the enhancement and compressibility factors as functions of temperature and pressure, is described and its parameters calculated. Model prediction errors were found to be well within ±0.2% of the most precise model for prescribed ranges of -40°C to 50°C (-40°F to 122°F) and 77.059 to 101.325 kPa (11.176 to 14.695 psia). These correspond to data in ASHRAE psychrometric charts 1, 2, 5, 6, and 7.Units: Dual