在本项目中，通过系统设计的实验，确定了14种LED照明灯具的热增益分布。具体而言，确定了对流热增益和辐射热增益之间的分割，以及经调节的空间热增益和天花板静压箱热增益之间的分割（如果适用）。LED照明选择标准首先是基于目前为LED照明行业制定的产品标准和计划确定的。然后选择并测试了14种不同的LED照明灯具。所选灯具包括两个高隔间、六个凹进式踏步器、一个筒灯、两个线性吊坠、两种新兴技术（高效能和变色）和一个改装套件。在正式测试之前，对三个选定的LED灯具进行了初步测试，以确定系统偏差、稳态、腔室的整体传热系数。 还检查了辐射热测量的试验重复性和测量单元数。在试点测试之后，所有14个灯具都在基本情况测试条件下进行了正式测试（60°F送风温度、60 cfm送风量、增压室回流、地毯地板饰面和无调光控制）对于每个测试的LED灯具，确定了对流热增益和辐射热增益之间的分割，以及调节空间热增益和天花板通风系统热增益之间的分割（如果适用）。结果表明，所有接受测试的嵌入式灯具的调节空间热增益范围为输入照明功率的40%至60%。大多数嵌入式灯具的总辐射热分数在照明功率的30%到42%之间，以及调节空间热增益的70%到84%之间。 只有51%照明功率的高效长筒灯和16%照明功率的筒灯除外。对于悬挂式灯具，高间距LED将42%至51%的照明输入功率转换为辐射热增益，而线性悬挂式LED的范围为55%至61%。highbay LED灯具的短波热量占照明功率的30%至39%。与高隔间相比，线性悬挂式灯具产生的长波辐射热大于短波辐射热。此外，四个选定的LED灯具在不同的实验条件下进行了测试，以确定不同测试条件对LED照明热增益的影响。检查的试验条件变化包括送风温度、送风量、回风配置、地板饰面和调光控制。 在所有测试条件下，回风配置和送风量对LED灯具的热增益分布影响最大。对于除筒灯外的所有灯具而言，管道回流增加了条件空间分数和辐射热分数。较高的送风量降低了空调空间份额和辐射热份额。调光控制和地板饰面仅影响照明照度，但对热增益分布没有显著影响。送风温度对LED照明的热增益分布没有显著影响。引文:ASHRAE研究

In this project, fourteen LED lighting luminaries’ heat gain distributions were determined through systematically designed experiments. Specifically, the split between the convective heat gain and the radiant heat gain, and the split between the conditioned space heat gain and ceiling plenum heat gain (if applicable) were determined.LED lighting selection criteria were defined first based on currently established product standards and programs for the LED lighting industry. Fourteen different LED lighting luminaires were then chosen and tested. The selected luminaires include two high-bays, six recessed troffers, one downlight, two linear pendants, two emerging technologies (high efficacy and color turning), and one retrofit kit.Prior to the formal test, a pilot test on three selected LED luminaires were conducted to determine the system bias, steady state, overall heat transfer coefficient of the chamber. The test repeatability and the measuring cell number for the radiant heat measurement were also examined. Following the pilot test, all fourteen luminaires were formally tested under base-case test conditions (60 °F supply air temperature, 60 cfm supply airflow rate, plenum return, carpeted floor finish, and no dimming control.) The split between the convective heat gain and radiant heat gain, and the split between the conditioned space heat gain and the ceiling plenum heat gain (if applicable) were determined for each of the LED fixture tested. Results show that all recessed luminaries tested have a conditioned space heat gain ranging from 40% to 60% of the input lighting power. The majority of the recessed luminaries show a total radiative heat fraction ranging from 30% to 42% of the lighting power and 70% to 84% of the conditioned space heat gain. The high efficacy troffer with 51% of the lighting power and the downlight with 16% of the lighting power are the exceptions. For the suspended luminaires, the high-bay LEDs converts 42% to 51% of the lighting input power to radiant heat gain while linear pendant ranges from 55% to 61%. The highbay LED fixtures have a short-wave heat fraction of 30% to 39% of the lighting power. The linear pendant fixtures generate more long-wave radiant heat than the short-wave radiant heat compared to the high-bays.In addition, four selected LED luminaires were tested under various experimental conditions to determine the impact of the different testing conditions on the LED lighting heat gains. The test condition variations examined include the supply air temperature, supply airflow rate, return air configuration, floor finish, and dimming control. For all the tested conditions, the return air configuration and supply airflow rate demonstrated the most significant impact on the heat gain distribution of the LED luminaries. The ducted return increases the conditioned space fraction and the radiative heat fraction for all the luminaries except the downlight. The higher supply airflow rate decreases the conditioned space fraction and radiative heat fraction. The dimming control and floor finish only affects the lighting illuminance but has no significant effect on the heat gain distribution. The supply air temperature does not show significant influence on the heat gain distribution of the LED lighting.