Sumit Tiwari

Energy analysis of partially covered number (N) of photovoltaic thermal-compound parabolic concentrator collectors connected in series at constant collection temperature mode

In present study, study has taken attempt to show the analysis of N-number of photovoltaic thermal (PVT)-compound parabolic concentrator (CPC) water collectors connected in series water collectors under constant collection temperature mode for the point of users demand unlike constant flow rate mode. The performance has been examined for thermal energy, thermal exergy and overall thermal energy of partially covered (N) number of Photovoltaic thermal-compound parabolic concentrator collectors connected in series has been analyzed. Here, the collector of present system is partially covered with 50% of PV module. The thermal modelling has been developed with basic energy balance equation of each component of proposed system. The outlet at Nth of partially covered Photovoltaic thermal (PVT)-compound parabolic concentrator (CPC) collectors has been obtained. The expression of analytical temperature dependent electrical efficiency of proposed system has been derived. The analysis has been carried out for clear day condition in month of January at New Delhi, India. The maximum thermal energy has been found 18.14 kWh per day and electrical energy has been found 1.30 kWh per day with constant outlet collection temperature at 67 °C.

Energy performance of partially covered N photovoltaic thermal-compound parabolic concentrator (PVT-CPC) collector for cold climate condition

In the paper, an attempt has taken to analyze the energy of N photovoltaic thermal (PVT)-compound parabolic concentrator (CPC) water collectors connected in series. The analysis has been examined for cold climate condition where high fossil fuels are need to get thermal energy. Two fluids has been considered: (i) water and (ii) air. The comparison has been made with two different fluids on partially covered N photovoltaic thermal-compound parabolic concentrator (PVT-CPC) collector connected in series. Here, the collector of proposed system is partially covered with 25% of PV module. The thermal modelling has been developed with basic energy balance equation of each component of proposed system. The outlet at Nth of partially covered Photovoltaic thermal (PVT)-compound parabolic concentrator (CPC) collectors has been obtained. The expression of analytical temperature dependent electrical efficiency of proposed system has been derived. The analysis has been carried out for clear day condition in month of January at Srinagar, India. The maximum thermal energy has been found 12.92 kWh and 3.72 kWh per day for fluid: water and air respectively and thermal exergy has been found 1.63 kWh and 0.55 kWh per day with eight number of collector.

Importance of phase change material (PCM) in solar thermal applications: A review

Present study is an attempt to study of different heat storage methods and their application for sustainable development. Solar energy is a prime source of energy which is responsible for other renewable sources directly or indirectly. The major drawback of solar energy is its availability in day time only. Thermal storage devices can overcome this drawback as they can store the energy in day time that can be utilized in off sunshine hours. In the present study classification of thermal storage methods has been done. Further different application of phase change material (PCM) has been discussed. Study shows that PCM can be successfully integrated nearly with all the solar thermal devices. This study will also help to understand to store maximum thermal energy that reduce the requirement of conventional fuels like coal, oil etc. Further, it will help in reducing greenhouse gasses and climatic changes.

Energy analysis of photovoltaic-thermal (PVT) greenhouse under forced mode without load condition

In the present analysis, a photovoltaic (PV) integrated greenhouse system under forced mode developed for biogas heating. Different factors have been assessed for weather condition of IIT, New Delhi, India. Ambient air temperature and radiation data have been measured experimentally. Further, thermal model has been derived for the PV greenhouse and various factor like greenhouse air temperature, solar cell temperature, and outlet air temperature through duct have been evaluated with the help of MATLAB 2013a software. Thermal energy, electrical energy, overall thermal energy, overall thermal efficiency, cell efficiency and thermal efficiency have been calculated. Thermal energy, overall thermal energy electrical energy and for a clear day found to be 4.55 kWh, 0.60 and 6.14 kWh respectively. Further, overall average thermal efficiency throughout the day found to be 69%.

Effect of packing factor of photovoltaic module on performance of photovoltaic-thermal (PVT) greenhouse solar dryer

In the present study, an attempt has been made to evaluate the effect of packing factor of photovoltaic (PV) module on the performance of hybrid photovoltaic-thermal (PVT) greenhouse solar dryer. Different parameters have been evaluated for climatic condition of Indian Institute of Technology, New Delhi (28_350N, 77_120E, 216 m above MSL), India. For the analysis solar radiation and ambient air temperature have been taken from IMD (Indian Meteorological Department) Pune. Further thermal modelling has been done for the PVT greenhouse dryer and different parameter like crop temperature, greenhouse temperature, outlet air temperature and cell temperature have been calculated with variation of packing factor of PV module by the help of MATLAB program. Further effect of packing factor on thermal energy, electrical energy, overall thermal energy, cell efficiency have been evaluated. Variation in thermal energy, electrical energy, and overall thermal energy with respect to packing factor found to be 3.66-2.05, 0-0.92 and 3.66-4.47 kWh respectively for a typical day of June.