The Experts below are selected from a list of 93 Experts worldwide ranked by ideXlab platform

G Ado - One of the best experts on this subject based on the ideXlab platform.

  • theoretical and experimental study of solar water heater with internal exchanger using Thermosiphon System
    Energy Conversion and Management, 2008
    Co-Authors: P M E Koffi, H Y Andoh, P Gbaha, S Toure, G Ado
    Abstract:

    Abstract This study presents a theoretical and experimental analysis of the thermal performance of a solar water heater prototype with an internal exchanger using a Thermosiphon System. The heat exchanger made of a rolled copper tube is placed diagonally in the storage tank so that the hot fluid crosses a significant mass of stored water. The results focus mainly on the levels of the heat fluxes, temperatures recorded, mass flow rate and efficiency of the collector. During the main insulation period, one obtains satisfactory qualitative and quantitative agreement between the experimental and theoretical results of mass flow rate and temperatures. Those indicate heat fluxes whose peak reaches 989 W/m 2 , collector outlet water temperature levels of more than 85.5 °C and a collector thermal effectiveness around 58%.

P M E Koffi - One of the best experts on this subject based on the ideXlab platform.

  • thermal performance of a solar water heater with internal exchanger using Thermosiphon System in cote d ivoire
    Energy, 2014
    Co-Authors: P M E Koffi, P Gbaha, Laise Kamena Koua, S Toure
    Abstract:

    This study presents a theoretical and experimental analysis of the thermal performance of a solar water heater prototype with an internal exchanger using Thermosiphon System. The results focus mainly on the levels of the heat fluxes temperatures recorded, mass flow rate and efficiency of collector. These tests are performed for a sunny day and a cloudy day. The daily solar intensities range from 300 to 1233 W/m2, with the daily ambient temperature ranging between 27 °C and 33 °C. Maximum temperatures at the flat solar collector output are 88 °C and 58 °C for the sunny day and cloudy day, respectively. Maximum instantaneous efficiencies are 68.33% and 50% for the sunny day and the cloudy day, respectively. The values of the thermal performances parameters FR (τα) and FRUL are 0.780 and 4.252 W/m2 °C respectively for the cloudy day and 0.777 and 4.689 W/m2 °C respectively for the sunny day. The coefficient of exchange thermal of heat exchanger Ue found is 149.15 W/(m2 K) when, the average heat exchanger effectiveness obtained is 70%. The experimental results show that mean daily efficiency is near 50%. This reveals a good compatibility of the System to convert solar energy to heat which can be used for heating water.

  • theoretical and experimental study of solar water heater with internal exchanger using Thermosiphon System
    Energy Conversion and Management, 2008
    Co-Authors: P M E Koffi, H Y Andoh, P Gbaha, S Toure, G Ado
    Abstract:

    Abstract This study presents a theoretical and experimental analysis of the thermal performance of a solar water heater prototype with an internal exchanger using a Thermosiphon System. The heat exchanger made of a rolled copper tube is placed diagonally in the storage tank so that the hot fluid crosses a significant mass of stored water. The results focus mainly on the levels of the heat fluxes, temperatures recorded, mass flow rate and efficiency of the collector. During the main insulation period, one obtains satisfactory qualitative and quantitative agreement between the experimental and theoretical results of mass flow rate and temperatures. Those indicate heat fluxes whose peak reaches 989 W/m 2 , collector outlet water temperature levels of more than 85.5 °C and a collector thermal effectiveness around 58%.

S Toure - One of the best experts on this subject based on the ideXlab platform.

  • thermal performance of a solar water heater with internal exchanger using Thermosiphon System in cote d ivoire
    Energy, 2014
    Co-Authors: P M E Koffi, P Gbaha, Laise Kamena Koua, S Toure
    Abstract:

    This study presents a theoretical and experimental analysis of the thermal performance of a solar water heater prototype with an internal exchanger using Thermosiphon System. The results focus mainly on the levels of the heat fluxes temperatures recorded, mass flow rate and efficiency of collector. These tests are performed for a sunny day and a cloudy day. The daily solar intensities range from 300 to 1233 W/m2, with the daily ambient temperature ranging between 27 °C and 33 °C. Maximum temperatures at the flat solar collector output are 88 °C and 58 °C for the sunny day and cloudy day, respectively. Maximum instantaneous efficiencies are 68.33% and 50% for the sunny day and the cloudy day, respectively. The values of the thermal performances parameters FR (τα) and FRUL are 0.780 and 4.252 W/m2 °C respectively for the cloudy day and 0.777 and 4.689 W/m2 °C respectively for the sunny day. The coefficient of exchange thermal of heat exchanger Ue found is 149.15 W/(m2 K) when, the average heat exchanger effectiveness obtained is 70%. The experimental results show that mean daily efficiency is near 50%. This reveals a good compatibility of the System to convert solar energy to heat which can be used for heating water.

  • theoretical and experimental study of solar water heater with internal exchanger using Thermosiphon System
    Energy Conversion and Management, 2008
    Co-Authors: P M E Koffi, H Y Andoh, P Gbaha, S Toure, G Ado
    Abstract:

    Abstract This study presents a theoretical and experimental analysis of the thermal performance of a solar water heater prototype with an internal exchanger using a Thermosiphon System. The heat exchanger made of a rolled copper tube is placed diagonally in the storage tank so that the hot fluid crosses a significant mass of stored water. The results focus mainly on the levels of the heat fluxes, temperatures recorded, mass flow rate and efficiency of the collector. During the main insulation period, one obtains satisfactory qualitative and quantitative agreement between the experimental and theoretical results of mass flow rate and temperatures. Those indicate heat fluxes whose peak reaches 989 W/m 2 , collector outlet water temperature levels of more than 85.5 °C and a collector thermal effectiveness around 58%.

Valeriano Ruiz - One of the best experts on this subject based on the ideXlab platform.

  • outdoor test method to determine the thermal behavior of solar domestic water heating Systems
    Solar Energy, 2008
    Co-Authors: O Garciavalladares, I. Pilatowsky, Valeriano Ruiz
    Abstract:

    Abstract The dynamics of the market, the generation of new promotion programs, fiscal incentives and many other factors are to be considered for the massive application of solar domestic water heating Systems (SDWHS) mainly of the compact Thermosiphon type, makes it necessary to choose simple and inexpensive procedure tests that permit to know their characteristic thermal behaviors without an official standard being necessary. Moreover, it allows the comparison among Systems and offers enough and reliable information to consumers and manufacturers. In most developing countries, an official national standard for SDWHS is not available, therefore it is necessary to adopt an international test procedure in which the cost and time of implementation is very important. In this work, a simple and inexpensive test method to determine the thermal behavior of SDWHS is proposed. Even though these procedure tests do not have an official standard structure they permit, by comparing different solar Systems under identical solar, ambient, and initial conditions, the experimental determination of: (a) the maximum available volume of water for solar heating; (b) water temperature increment and available thermal energy at the end of the day; (c) temperature profiles (stratification) and the average temperature in the storage tank after it is homogenized; (d) the average global thermal efficiency; (e) water temperature decrement and energy lost overnight; and (f) the relationship between hot water volume and solar collector area as function of the average heating temperature. An additional proposed test permits to know the heat losses caused by the reverse flow in the collector loop. These tests will be carried out independently of the configuration between the solar collector and the storage tank, the way the fluid circulates and the type of thermal exchange. The results of this procedure test can be very useful, firstly, for the local solar manufacturers’ equipment in order to design and optimize its products comparing their Systems against a reference System under identical test conditions and secondly, by the consumers in order to select the most suitable System. The resulting experimental data for a particular Thermosiphon System is presented and discussed.

Jie Ji - One of the best experts on this subject based on the ideXlab platform.

  • comparative experiment study on photovoltaic and thermal solar System under natural circulation of water
    Applied Thermal Engineering, 2011
    Co-Authors: Wei He, Yang Zhang, Jie Ji
    Abstract:

    Abstract The hybrid photovoltaic and thermal (PV/T) System can utilize solar energy more effectively and has a higher total efficiency compared with a traditional solar collecting System and a photovoltaic (PV) module. However, there is limited experimental data on how much energy the PV/T System can save when operating with same area of a PV plate and a solar collector simultaneously. In this paper, a comparative test rig had been set up to measure and analyze the performance of PV/T System. There were monocrystalline silicon PV/T solar collector, a traditional solar collector and a monocrystalline silicon photovoltaic plate. The PV/T collector and the traditional solar collector had the same collecting areas and solar cell covered area of the PV/T collector was the same as the area of the photovoltaic plate. The experimental results showed that the daily thermal efficiency of PV/T System was about 40%, which was about 75% of that for a traditional solar Thermosiphon System, and the daily average electrical efficiency was found about 10%, which was a little lower than the photovoltaic module. But primary-energy saving efficiency of the PV/T System was much higher than that of the individual PV plate and the traditional solar collector.