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Author: search.filters.author.Soni, Manoj KumarSubject: search.filters.subject.Earth Water Heat Exchanger (EWHE)

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    Exergy analysis of a photovoltaic thermal system with earth water heat exchanger cooling system based on experimental data
    (Inder Science, 2017-08) Soni, Manoj Kumar
    In this paper, an attempt has been made to evaluate the experimental exergetic assessment of photovoltaic/thermal (PV/T) system with novel cooling technology termed as earth water heat exchanger (EWHE) cooling. The exergetic efficiency is calculated by considering of exergy destructions and exergy losses. It was observed that the total exergetic efficiency of PV/T is the function of mass flow rate of cooling water for a given solar radiation. The exergetic efficiency of the PV/T system is calculated in three ways, Case I: excluding exergy losses, Case II: including both exergy losses and exergy destructions and Case III: considering only exergy destructions. The results of all the cases were compared and it was found out that the exergetic efficiency of PV/T in Case III was more than the other two cases and it lies between 24.95% to 25.85% and 24.30% to 25.57% for the flow rate of 0.017 kg/s and 0.025 kg/s respectively.
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    Experimental and theoretical analysis of glazed tube-and-sheet photovoltaic/thermal system with earth water heat exchanger cooling
    (Elsevier, 2017-12) Soni, Manoj Kumar
    In the present paper, an attempt has been made to investigate the theoretical and practical performances of the photovoltaic/thermal (PV/T) system coupled with earth water heat exchanger (EWHE) cooling system for the conditions of semi-arid region of Pilani, Rajasthan. The experimental studies have been performed for different flow rates of cooling water (0.033 kg/s, 0.025 kg/s and 0.017 kg/s) for a typical day climatic conditions. An electrical efficiency comparison was made for two scenarios when the PV panel was connected or disconnected with the thermal collector and found out that the average electrical efficiency of PV/T panels is higher than the normal PV efficiency. The results of the experimental study showed that the maximum PV panel temperature goes up to 73 °C without any cooling. On the other hand, the PV panel temperature drops in the range of 43.68–49.64 °C with the flow rate of 0.033 kg/s. It has been estimated that the electrical and thermal efficiencies of the PV/T system with cooling are in the range of 8.26–8.52% and 44.06–55.45% respectively for flow rate of 0.033 kg/s. The EWHE pipe length of 38 m found to be sufficient for the proposed system. The experimental results are validated with the theoretical model by using basic energy balance equations and found in good agreement with percentage error of 0.91–12.09%.
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    Modelling and Simulation of Concentrating Photovoltaic System with Earth Water Heat Exchanger Cooling
    (Elsevier, 2017-03) Soni, Manoj Kumar
    In the present paper, a novel cooling system for concentrating photovoltaic (CPV) which is termed as earth water heat exchanger (EWHE) is modeled and simulated for local conditions of Pilani, Rajasthan. The CPV temperature and power output are obtained with respect to variation in mass flow rate of fluid and concentration ratio (CR). The simulation results shows that the maximum CPV temperature goes up to 416.36 °C at 3 Suns without any cooling, while with cooling it is reduced down to 85.28 °C for the mass flow rate of 0.022 kg/s. CPV temperature drop and power output increases with increasing in mass flow rate when it operated with EWHE in a closed loop. The mass flow rate of 0.022 kg/s is estimated as suitable flow rate as it may be used for the practical applications. It is also observed that with increase in mass flow rate the outlet temperature of CPV/T decreased.
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    Performance Analysis of Earth Water Heat Exchanger for Concentrating Photovoltaic Cooling
    (Elsevier, 2016-12) Soni, Manoj Kumar
    In the present work, an earth water heat exchanger (EWHE) has been designed for Pilani, Rajasthan (India). The system is designed and simulated in transient analysis tool TRNSYS (v17.0) by varying its operating parameters which includes mass flow rate, length, pipe materials and diameter of buried pipe. The depth-wise temperature of soil has also been evaluated from the simulation and it is found that the depth of 3.5 m is sufficient for pipe burial. The results show that there is an inverse correlation between the pipe length and the EWHE outlet temperature. The comparative study between three different material shows that the performance of EWHE system hardly depends on the properties of these material. Further, the EWHE performance is found to be decreasing with an increase in the mass flow rate from 0.008 kg/s to 0.05 kg/s. The simulated proposed system is then compared with the existing ones in the literature for a given cooling setup of Concentrating Photovoltaic (CPV). It is observed that the proposed system gives better performance than the cooling system given in literature. To achieve the temperature drop from 48.5̊C to 25.5̊C as per the existing CPV setup in the literature, the pipe length of 60 m would be sufficient in the proposed EWHE system. Thus the coupling of EWHE with CPV plants could be economical as well as performance enhancer.
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    An integrated photovoltaic thermal solar (IPVTS) system with earth water heat exchanger cooling: Energy and exergy analysis
    (Elsevier, 2017-11) Soni, Manoj Kumar
    In the current paper, a new hybrid system is investigated in which integrated photovoltaic thermal solar system (IPVTS) is coupled with earth water heat exchanger (EWHE). The performance of such coupled system is evaluated analytically by developing a theoretical model and validated experimentally on an experimental set-up installed in Pilani, India. Further to identify the grey areas for the improvement and to utilize the maximum energy, second law thermodynamic analysis of coupled system has been carried out in terms of exergy losses and exergy destructions. An electrical efficiency comparison was made between the PV panel connected to the broad water channel cooling and normal PV panel. The results show that with EWHE cooling, there is increase in experimental electrical efficiency of IPVTS by 1.02–1.41% as compared to without cooling. The second law analysis for two different scenarios was carried out. The second law analysis shows that the exergetic efficiency for a first scenario varies from 8.50% to 8.75%; while for the second scenario, it ranges from 8.16% to 8.54%. The analysis provides the feasibility of IPVTS coupled with EWHE system which could be used for the semi-arid regions of North-West India.