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    Wyświetlanie 1-3 z 3
    Tytuł:
    Assessing the Solar Power Plant Efficiency Degradation Resulting from Heating
    Autorzy:
    Lavrik, A.
    Yakovleva, E.
    Lеskov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/124651.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    photoelectric module
    PEM
    solar power plant
    performance coefficient
    heating
    cooling
    Opis:
    Renewable power sources (RPS) play an ever growing role in power production. With the green power cost decreasing, the RPS share (including hydro power plants) in power production grows fast. Using RPS in supplying power to various facilities reduces the CO2 emission into atmosphere, thus reducing the greenhouse effect and being a fundamental factor in fighting the global warming. Every type of RPS possesses certain drawbacks that need to be eliminated. RPS units do have disadvantages, too, including low efficiency coefficient, and low specific power. However, there is the need for specific technological conditions. The present work describes the issue of photoelectric module heating. Photoelectric module heating results in both lower output voltage and module aging acceleration. The present work offers the method for assessing the practicability of development and implementation of solar power cell module active cooling systems, based on the photoelectric module daily performance schedules, drawing on statistic meteorological data collected over many years, and also it presents the brief description of various methods for cooling photoelectric modules.
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 3; 115-119
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of optimum heating and cooling degree-hour values for pepper plant
    Autorzy:
    Atilgan, A.
    Yucel, A.
    Tanriverdi, C.
    Oz, H.
    Tezcan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/101263.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    cooling
    degree-hour
    heating
    Kumluca
    Opis:
    Information on the energy needs of agricultural production activities carried out in any region can be obtained in advance. Many methods are used for this purpose. One of them is a degree-hour method. Kumluca district of Antalya province where pepper cultivation is done intensively was chosen as a study area. The growers prefer autumn production of pepper plants inside the greenhouses in this region. Production starts in early October and last until June. The long-term (1960-2015) thermometer temperatures in the study area were obtained from the Turkish State Meteorological Service. In this study, by using only meteorological data, during each growing season (planting, flowering, pollination, fruit ripening and harvesting) were obtained degree-hour values for the pepper plant and evaluated with Student-t test. Regression coefficients were obtained by correlating heating and cooling degree-hour values with different temperature values which are recommended during the vegetative growing season for the pepper plant. Regression analysis was performed between obtaining heating and cooling degree-hour values (dependent variable) and annual mean heating and cooling degree hour values (independent variable) which are suggested basic temperature values. In conclusion, the regression coefficients were determined as 0.99 for out of greenhouse heating degree-hour and as 0.90-0.99 for cooling degree-hour, respectively. Heating and cooling-hour values were found between 0.96-0.88 and 0.99-0.87, respectively. It was determined that there are very high correlations in the positive direction. According to different growing seasons of pepper, knowing how much less or more of heating and cooling degree-hour values is needed, one can give information in advance in terms of energy consumption or usage. Areas or regions where less energy is to be used can be determined in terms of agricultural production to be done in any region.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2017, II/1; 457-467
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of heating and cooling degree-hour values in greenhouses with different color cover materials: the case of lettuce plant
    Autorzy:
    Atılgan, Atılgan
    Yücel, Ali
    Aktaş, Hakan
    Tunçbilek, Funda
    Powiązania:
    https://bibliotekanauki.pl/articles/101255.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    cover material
    degree-hours
    greenhouse
    heating
    cooling
    Opis:
    In this study, it is aimed to determine the effect of greenhouse cover material of different color on the number of heating (HDHN) and cooling degree hours (CDHN) and heating (HDH) and cooling degree hours (CDH) of the lettuce plant. For this purpose, the study was carried out in the CtrlG (Control transparent PE greenhouse), RedG (Red PE greenhouse) and BlueG (Blue PE greenhouse). The study was completed in 2018 at ISUBU research and application farm. The temperature values measured in the three greenhouses with the same dimensions were the material of the study. HDH, CDH, HDHNs, and CDHNs were calculated by examining the measured temperature values and suggested temperature values for the lettuce plant. By using these values, it was tried to determine suitable cover material during the growing period of the lettuce plant. It has been concluded that the use of colored covering material is more suitable in terms of energy needs in almost all growing periods of lettuce plants. By comparing the values calculated for RedG and BlueG based on CtrlG, the coefficients of variation were calculated to determine which data series or series were more similar to each other. According to the coefficients of variation, the average values of HDH, CDH, HDHNs and CDHNs of the control greenhouse and other colored covered greenhouses ranged between 1,365 and 14,102%. Based on the CtrlG, BlueG was more homogeneous (1,365-8,364%), whereas RedG was less homogeneous (3,798-14,102%). It can be said that the use of colored covering material in greenhouses for lettuce plants will be more advantageous in terms of energy requirement.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2019, III/1; 235-252
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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