The goal of this paper is to quantify the impact of weather-induced and altitude-induced barometric pressure variations on the cooling capacity measurement of hydronic coils in room fan coil units. Based on an AHRI-certified coil simulation model and the Monte Carlo sampling method, capacity measurement data were simulated for three hydronic cooling coils at a fixed testing condition with different barometric pressures. The model outputs were statistically analyzed to determine the standardized regression coefficient for sensitivity evaluation. Results show that the total and sensible capacity measurements at a fixed location are less sensitive to weather-induced barometric pressure fluctuation compared with the impacts of entering air dry- and wet-bulb temperatures, airflow rate, and leaving water temperature. While marginal impact on the sensible capacity measurement, the altitude-induced barometric pressure variation from 101.635 kPa (14.741 psia) to 81.210 kPa (11.779 psia) leads to over 10% increase in the total capacity measurement with the fixed entering air and water temperatures and airflow rate. A procedure to adjust the entering air wet-bulb temperature based on local barometric pressure was proposed and validated. The mitigation procedure contributes to the consistency improvement of standard testing and enables the cooling capacity conversion between sea level and elevated altitudes.

本文的目的是量化天气引起的气压变化和海拔引起的气压变化对室内风机盘管中水力线圈冷却能力测量的影响。基于AHRI认证的盘管仿真模型和蒙特卡洛采样方法，在固定的测试条件下，不同的大气压下，模拟了三个水力冷却盘管的容量测量数据。对模型输出进行统计分析，以确定用于敏感性评估的标准化回归系数。结果表明，与进入空气的干球和湿球温度，空气流量和出水温度的影响相比，在固定位置进行的总容量和合理容量测量对天气引起的大气压波动较不敏感。虽然对显着的容量测量有边际影响，但海拔高度引起的大气压从101.635 kPa（14.741 psia）到81.210 kPa（11.779 psia）的变化会导致总容量测量增加10％以上，并且输入空气和水的温度固定不变。气流速度。提出并验证了基于局部大气压调节进气湿球温度的程序。缓解程序有助于提高标准测试的一致性，并使冷却能力在海平面和高海拔之间转换。提出并验证了基于局部大气压调节进气湿球温度的程序。缓解程序有助于提高标准测试的一致性，并使冷却能力在海平面和高海拔之间转换。提出并验证了基于局部大气压调节进气湿球温度的程序。缓解程序有助于提高标准测试的一致性，并使冷却能力在海平面和高海拔之间转换。