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Browsing by Author "0000-0001-5027-9458"

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    Experimental analysis of a solar absorption system with interior energy storage
    (University Cape Town, 2012-05) Pastakkaya, Bilsay; Yamankaradeniz, Nurettin; Kaynaklı, Ömer; Coşkun, Salih; Yamanakaradeniz, Recep; Uludağ Üniversitesi/Orhangazi Meslek Yüksekokulu.; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.; 0000-0001-5027-9458; AAA-1753-2021; R-2401-2018; 56257775400; 26645227400; 8387145900; 26644674500; 56257534000
    This study examines experimentally the cooling application of a solar absorption system with interior energy storage that uses two different auxiliary systems. The experiments were performed at Uludag University, Bursa, Turkey on the 3rd and 4th of August 2010 that had the approximately same average outdoor temperature, 31 degrees C. A solar hot water was delivered via a 40 m2 array of flat plate solar collectors that drove a lithium chloride (LiCl) absorption heat pump with a cooling power peak of 20 kW A solar-powered air conditioning system was designed for heating and cooling in a test room that had a total floor space of 30 m2. Chilled water produced in the evaporator was supplied to the fan coil units, and the heat of condensation and absorption was rejected by means of a wet cooling tower. An electric heater and an air source heat pump were used as auxiliary systems for the absorption cooling application for two different cases when the solar energy was insufficient. Temperature variations were recorded for the absorption machine components, the test room, and the outdoors. The cooling energy, thermal energy, and daily average coefficient of performance (COP) of the absorption system were calculated for two days. Solar absorption cooling was considered for two different auxiliary systems and is presented in this manuscript. The results showed that the daily average COP of the absorption system was 0.283 for Case 1 and 0.282 for Case 2. For both cases, the interior energy storage of the absorption system enabled it to satisfy the cooling demand during the night while solar energy was not available.
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    Performance analysis of a geothermal heat-powered resorption cooling system: A case study for cold storage of apple fruit
    (Oxford Univ Press, 2023-02-04) Pastakkaya, Bilsay; PASTAKKAYA, BİLSAY; Bursa Uludağ Üniversitesi/Orhangazi Yeniköy Asil Çelik Meslek Yüksekokulu.; 0000-0001-5027-9458
    Renewable energy use in agricultural applications is essential for sustainable production. Resorption cooling systems can be operated for agricultural cooling applications by using thermal energy derived from geothermal springs with sufficient temperature. Since the resorption cycle uses ammonia-water solution, cold storage and industrial cooling processes below 0 & DEG;C can be actualized efficiently. In this article, a geothermal powered resorption system for cold storage of apple fruit is investigated. Technical features and cooling performance of the resorption system are analysed and compared to the other conventional cooling systems. Results showed that, geothermal powered resorption cooling systems can annually cover the cooling load of the cold storage application with adequate cooling temperature and capacity. Moreover, the use of the geothermal powered resorption system enables to set up safer and more economic cooling applications with the similar cooling performance compared with the alternative sorption cooling systems, and provides substantial economic benefits by reducing the cooling costs in agricultural production with lower operational costs.
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    Performance analysis of a re-circulating heat pump dryer
    (Vinca Inst Nuclear, 2014-06-08) Yamankaradeniz, Nurettin; Sökmen, K. Furkan; Coşkun, Salih; Kaynaklı, Ömer; Pastakkaya, Bilsay; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu/Elektrik ve Enerji Bölümü.; Uludağ Üniversitesi/Mühendislik ve Mimarlık Fakültesi/Makine Mühendisliği Bölümü.; Uludağ Üniversitesi/Orhangazi Meslek Yüksekokulu.; Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Makine Mühendisliği Bölümü.; 0000-0001-8647-4861; 0000-0001-5027-9458; R-5685-2016; AAA-1753-2021; R-2401-2018; 26645227400; 26645227400; 26644674500; 8387145900; 56257775400
    A re-circulating heat pump dryer (HPD) system was designed, constructed and tested at steady-state and transient conditions. Refrigerant 134a was used as a refrigerant in this system. The tests were performed to observe behavior of HPD system. So, changes of temperature and relative humidity of drying air through the dryer and heat pump operating temperatures were observed during the drying process and effects of by-pass air ratio (BAR) on the system's parameters as system performance and specific moisture extracted ratio (SMER) at steady-state were investigated. The HPD system was also tested to investigate temperatures and relative humidity changes of drying air during drying process on the system's parameters depend on time. Airflow rate circulated through the HPD system was 554 m(3)/h during the all tests. According to test results, the system's parameters did not change up to 40% of BAR. Then the coefficient at performance (COP) and SMER values were decreased after 40% of BAR. While SMER values changed between 1.2 and 1.4, COPsys changed between 2.8 and 3.3 depend on BAR. As well as during the drying process, the COP and SMER values were also affected and decreased depend on time.