众所周知，供暖、通风和空调（HVAC）系统的冷却盘管是微生物的蓄水池，通常被确定为室内空气质量差和医院感染。除了室内空气质量差之外，这些微生物还会在HVAC盘管上形成生物膜，导致机械性能差。性能差可以通过气流减少、压差增大和气流均匀性差来衡量。ASHRAE文件《2013年医院和诊所暖通空调设计手册》。穿过盘管表面的不均匀气流速度分布可能会导致容量损失、水分携带或冻结问题”。ASHRAE认为紫外线杀菌辐射（UVGI）是处理HVAC表面生长的生物膜的有效工具。ASHRAE手册:HVAC应用建议50- 线圈表面100μW/cm²（0.394 in²）的UVC强度是一种有效的线圈处理方法。然而，fin或文件中的UVC穿透深度并不取决于线圈穿透深度，也不取决于线圈穿透深度。本文将介绍典型暖通空调盘管表面UVC强度的理论建模和实验室测量数据。为了了解UVC穿透线圈间隙的有效性，分别在线圈表面2英寸（50.8毫米）和4英寸（101.6毫米）深度进行了测量。使用校准辐射计测量和记录UVC强度，该辐射计能够产生可追溯至NIST的结果，并通过NIST追溯至国际单位制（SI），ANSI/NCSI Z540。 1-1994和ANSI/NCSI Z540。3 -- 2006. 典型线圈生物膜的理论还原在不同线圈深度下呈现不同的UVC强度。对比分析在50-1000μW/cm²的强度范围内进行。Ryan等人根据实验室数据和冷却场数据进行了对比（Ryan等人，2011年）。现场数据来自两家三级护理医院的案例研究。经过反复的化学线圈治疗，这两家医院的暖通空调系统表现严重不佳。两家医院都能够通过应用大于或等于1000μW/cm²（0.5μW/cm²）的最小UVGI强度来减轻线圈的生物膜，并恢复最佳性能。 394平方英寸）。在UVGI安装之前和之后，对线圈的污染进行了分析。根据这些数据，可以建立最小线圈UVC强度的标准，以有效处理不同的线圈深度和鳍间距。引文:2017年冬季会议，内华达州拉斯维加斯，会议论文

It is well understood heating, ventilation and air-conditioning (HVAC) systems' cooling coils are reservoirs of microorganisms typically identified with poor IAQ and Hospital Acquired Infections. In addition to poor IAQ, these microorganisms develop a biofilm on HVAC coils resulting in poor mechanical performance. Poor performance can be measured in reduced airflow, increased pressure differential and poor air flow uniformity. ASHRAE document "HVAC Design Manual for Hospitals and Clinics, 2013 states ". an uneven air velocity distribution across the coil face can result in loss of capacity, moisture carryover or freeze up problems". ASHRAE recognizes Ultraviolet Germicidal Irradiation (UVGI) as an effective tool to treat biofilms growing on HVAC surfaces. ASHRAE Handbook: HVAC Applications suggests 50-100μW/cm2(0.394 in2) of UVC intensity, at the coil's surface, can be an effective coil treatment. However, the document does not quantify the effectiveness nor does it address the UVC intensity required for coil penetration dependent upon fin spacing or coil depth. This paper will present data from theoretical modeling and laboratory measurements of the UVC intensities at the surface of typical HVAC coils. To understand how effectively the UVC penetrates the coil's interstitial spaces, measurements were taken at the coil's surface, 2" (50.8 mm) and 4" (101.6 mm) depths respectively. UVC intensities were measured and recorded with a calibrated radiometer capable of producing results that are traceable to NIST and through NIST to the International System of Units (SI), ANSI/NCSI Z540.1 -- 1994 and ANSI/NCSI Z540.3 -- 2006. Theoretical reductions of typical coil biofilms are presented with varying UVC intensities at varying coil depths. The comparative analysis is demonstrated at intensities ranging from 50-1000 μW/cm2. The comparisons are based upon laboratory analysis, published data, and data from applied field studies quantifying the microorganism concentrations on cooling coil surfaces (Leach and Scheir 2014; Ryan, et al., 2011). Field data are presented from case studies of two tertiary care hospitals. The two hospitals were experiencing severely underperforming HVAC systems after repeated chemical coil treatments. Both hospitals were able to mitigate the coil's biofilm and restore optimum performance by applying a minimum UVGI intensity of greater than or equal to 1000 μW/cm2(0.394 in2). Contamination from coils was analyzed pre and post UVGI installation. Based upon these data, standards can be established for minimum coil UVC intensities to effectively treat varying coil depths and fin spacings.