Renewable energy sources are fast emerging as more reliable supplement of conventional energy sources. Among the various renewable sources, solar energy is most sought after in today’s world. Solar PV modules when installed in outdoor environments suffer from various factors which are generally unaccounted in laboratory testing. Energy generation from solar collectors is primarily dependent on the amount of incident radiation on their surfaces. Soiling on modules is known to reduce the transmittance of incident rays to solar cell and cause significant output power degradation. Soiling is closely associated with the various factors such as module tilt angle, site-specific climate, outdoor exposure period, humidity, wind speed, dust characteristics and material properties. This experimental work is aimed to study the transmittance losses encountered by solar PV modules and the corresponding power degradation. The experimental results show an alarming reduction in transmittance as high as 69.06% over the dry study period experiencing no rain. The power of dusty solar module decreases by 29.76% compared to the module cleaned on daily basis. Dust deposition density on the PV module accounted to 9.6711 g/m2 over the study period.

中文翻译：

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加德满都谷地安装的太阳能光伏组件因污染而导致的透射率损失

可再生能源正在迅速崛起，成为传统能源的更可靠补充。在各种可再生资源中，太阳能是当今世界上最受追捧的能源。当安装在室外环境中时，太阳能光伏模块会受到多种因素的影响，这些因素通常在实验室测试中无法解决。太阳能集热器产生的能量主要取决于其表面入射的辐射量。已知模块上的污染会降低入射光线对太阳能电池的透射率，并导致显着的输出功率下降。污染与各种因素密切相关，例如组件倾斜角，特定地点的气候，室外暴露时间，湿度，风速，灰尘特性和材料特性。这项实验工作旨在研究太阳能光伏组件遇到的透射率损失以及相应的功率下降。实验结果表明，在无雨的干旱研究期内，透光率的降低幅度高达69.06％。与每天清洁的组件相比，多尘的太阳能组件的功率下降29.76％。在研究期间，PV模块上的粉尘沉积密度为9.6711 g / m2。