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    Wyświetlanie 1-2 z 2
    Tytuł:
    Solar air conditioning system using desiccant wheel technology as a solution for Iraq
    Autorzy:
    Al-Ahmedi, Karrar
    Powiązania:
    https://bibliotekanauki.pl/articles/132049.pdf
    Data publikacji:
    2019
    Wydawca:
    Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
    Tematy:
    cooling
    solar electric cooling system
    solar thermal cooling system
    Opis:
    The electrical energy consumption in Iraq has increased sharply in the past few years. Modern energy efficient technologies are desperately needed for the national energy policy. The main purpose of this paper is to analyze the various cooling systems, using the readily available solar energy to cool down the buildings in Iraq during hot weather days. This paper presents the best solar cooling system which can be installed in Iraq for solar cooling. It also focuses on the type of thermally driven system which can be used for solar cooling. It is fact that many buildings in Iraq are designed far away from being energy efficient, hence this paper focuses on the standards which can be developed and can be used in the future on residential buildings from the energy point of view, with a suggestion to establish such solar cooling projects in Iraq. Systems have been used successfully in northern Europe and a number of studies have demonstrated that solar energy can be used to drive the system in this region. However, to date, desiccant cooling has not been used in Iraq. This paper presents the results of a study, in which a solar desiccant cooling model will use to evaluate the potential for using solar power to drive a desiccant cooling system in Iraq. The study demonstrates that solar desiccant cooling is feasible in Iraq, provided that the latent heat gains experienced are not excessive. However, if the relative humidity experienced are too high then desiccant cooling becomes impracticable simply because the regeneration temperatures required are excessive.
    Źródło:
    Modern Engineering; 2019, 2; 88-93
    2450-5501
    Pojawia się w:
    Modern Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the use of sorption and evaporative cooling as part of the preparation of ventilation air for Polish climatic conditions
    Autorzy:
    Rzążewski, Mikołaj
    Grzebielec, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2195739.pdf
    Data publikacji:
    2021
    Wydawca:
    Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
    Tematy:
    DEC
    SDEC
    sorption cooling system
    evaporative cooling
    solar cooling
    alternative ways of cooling
    ventilation air
    thermal comfort
    system chłodzenia sorpcyjnego
    chłodzenie wyparne
    chłodzenie słoneczne
    alternatywne sposoby chłodzenia
    powietrze wentylacyjne
    komfort termiczny
    Opis:
    In this paper, the possibility of use of a DEC type air conditioning system, using solar energy, in Polish climatic conditions Polish, as an alternative to traditional systems based on compressor refrigeration equipment, was analyzed. At the beginning of the work, attention was paid to how important it is for users to maintain thermal comfort conditions and how these conditions can be determined. It also shows why the DEC system can be a good solution for the cases under consideration. In the next part of the paper, the analyzed system is described, presenting the individual processes of humid air transformation taking place in it, in which devices these processes can take place and how they were modeled in further calculations. Modeling the operation of the DEC system was based mainly on determining the efficiency of individual devices, i.e. the effectiveness of the processes taking place in them and the use of a psychometric graph. Similarly, the method of calculating the useful heat that can be obtained from solar collectors under known conditions is presented. For this purpose, meteorological data and the theory of similarity in heat transfer were used. In the next part of the work, an example of a calculation cycle was presented, along with the next steps of applying to the psychometric graph points corresponding to the states of moist air at individual points of the DEC system. On the basis of such calculation cycles, performed for different values of outdoor air parameters, the relationships of the obtained cooling power, the power supplied for adsorber regeneration, EER, temperature and relative humidity of the supply air to rooms, from the temperature and relative humidity of the outside air. Next, the calculation process for determining the useful heat obtained from solar collectors is presented. On the basis of several such processes, the average conditions of heat collection from the collector were determined, on the basis of which the amount of energy obtained from solar radiation was determined on the scale of the entire summer period. On the basis of this analysis, surpluses and shortages of energy obtained from collectors on individual days of the considered period were determined. In conclusion, it was stated that despite the fairly good cooperation of the system with solar collectors and its simple construction, the DEC system cannot be an alternative to compressor refrigeration equipment. This is mainly due to the unfavorable level of relative humidity in Polish climatic conditions, which does not allow the device to achieve the appropriate temperature of the air supplied to the rooms.
    Źródło:
    Modern Engineering; 2021, 1; 22--35
    2450-5501
    Pojawia się w:
    Modern Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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