Öz
Günümüzde, İklimlendirme sistemlerinde enerji tüketimi ve enerji verimliliği açısından hızlı gelişmeler yaşanmaktadır. Bu sistemler içerisinde absorpsiyonlu soğutma sistemlerin de atık ısı ve yenilenebilir enerji kaynakları kullanılmaktadır. Bu sistemin ilk yatırım maliyetinin yüksek olmasına rağmen, atık ısı kullanımından dolayı işletme maliyeti düşüktür. Bu çalışmada tek kademeli LiBr-H_2 O akışkan çifti ile çalışan absorbsiyonlu soğutma sistemlerinde ısıtıcı, yoğuşturucu, soğurucu ve buharlaştırıcı sıcaklıklarının sistem performansı üzerine etkisi (COP) incelenmiştir. Sıcaklık etkisi termodinamik eşitlikler yardımı ile enerji denklikleri kullanılarak araştırılmıştır. Jenaratör sıcaklığının arttırılması ile sistem performansının (COP) arttığı, yoğuşturucu ve soğurucu sıcaklıklarının arttırılması ile sistem performansının (COP) azaldığı bulunmuştur. Ayrıca farklı jenaratör, yoğuşturucu, soğurucu ve buharlaştırıcı sıcaklıklarında incelenen sistemde LiBr-H_2 O eriyik sıcaklığının ve konsantrasyonun değiştiği, buna bağlı olarak bazı parametrelerde kristalizasyonun oluştuğu tespit edilmiştir.
Anahtar Kelimeler
Lityum bromür-su çözeltisi Absorbsiyonlu soğutma sistemi Performans katsayısı
Kaynakça
- Avanessian T., Ameri M. Energy, exergy and economic analysis of single and double effect LiBr-H_2 O absorption chillers. Energy and Buildings 2014; 73: 26-36.
- Cimşit C. Thermodynamic analysis of vapour compression-absorption two stage refrigeration cycle. Karaelmas Science and Engineering Journal 2018; 8(1): 218-226.
- Han B., Li W., Li M., Liu L., Song J. Study on LiBr-H_2 O absorption cooling system based on enhanced geothermal system for data center. Energy Reports 2020; 6(9): 1090-1098.
- Horuz İ. Comparison of ammonia - water pair and lithium bromide - water pair from absorption coling systems. Master of Science in İnstitute of Science Uludağ Unıversity, page no:177, Bursa, Turkey,1990.
- Kaynaklı Ö., Yamankaradeniz R. A comparision between H_2 O-LiBr and NH_3-H_2 O solutions in single absorption refrigeration system. Dokuz Eylul University Faculty of Engineering Journal of Science and Engineering 2003; 5(2): 73-87.
- Kızılkan Ö., Şencan A., Kalogirou SA. Thermoeconomic optimization of a LiBr absorption refrigeration system. chemical engineering and processing 2007; 46: 1376-1384.
- Liao X. The development of an air-cooled absorption chiller concept and its integration in CHP systems. Degree of Doctor in İnstitute of Science Maryland University, page no: 172, College Park, USA, 2014.
- Liu Z., Yang S., Deng C. Optimal design and analysis of a cascade LiBr-H_2 O absorption refrigeration-transcritical CO_2 process for low-grade waste heat recovery. Energy Conversion and Management 2019; 192: 232-242.
- Özen DN., Yağcıoğlu KÇ. Thermodynamic and exergy analysis of an absorption cooling system for LiBr-H_2 O fluid couple. Selcuk University Journal of Engineering Science and Technology 2019; 7(1): 135-145.
- Soliman AS., Zhu S., Xu L., Dong J., Cheng P. Design of an LiBr-H_2 O absorption system using PCMs and powered by automotive exhaust gas. Applied Thermal Engineering 2021; 191: 116881.
- Yaniktepe B., Kara O., Ozalp C. Technoeconomic evaluation for an installed small-scale photovoltaic power plant. International Journal of Photoenergy 2017; 2017: 1-7.
Performance Analysis of A Single Stage Absorption Cooling System at Different Operating Temperatures
Öz
Today, rapid developments are experienced in terms of energy consumption and energy efficiency in air conditioning systems. Among these systems, waste heat and renewable energy sources are used in absorption cooling systems. Although the initial investment cost of this system is high, the operating cost is low due to the use of waste heat. In this study, the effect of generator, condenser, absorber and evaporator temperatures on system performance (COP) in absorption cooling systems operating with single-stage LiBr-H_2 O fluid pair was investigated. The temperature effect was investigated using energy balances with the help of thermodynamic equations. It was found from the results that the system performance (COP) increased with increasing the generator temperature, and the system performance (COP) decreased with increasing the condenser and absorber temperatures. In addition, it was determined that the LiBr-H_2 O solution temperature and concentration changed in the system examined at different generator, condenser, absorber and evaporator temperatures, and crystallization occurred accordingly in some parameters.
Anahtar Kelimeler
Water-lithium bromide solution Absorption refrigeration system Coefficient of performance
Kaynakça
- Avanessian T., Ameri M. Energy, exergy and economic analysis of single and double effect LiBr-H_2 O absorption chillers. Energy and Buildings 2014; 73: 26-36.
- Cimşit C. Thermodynamic analysis of vapour compression-absorption two stage refrigeration cycle. Karaelmas Science and Engineering Journal 2018; 8(1): 218-226.
- Han B., Li W., Li M., Liu L., Song J. Study on LiBr-H_2 O absorption cooling system based on enhanced geothermal system for data center. Energy Reports 2020; 6(9): 1090-1098.
- Horuz İ. Comparison of ammonia - water pair and lithium bromide - water pair from absorption coling systems. Master of Science in İnstitute of Science Uludağ Unıversity, page no:177, Bursa, Turkey,1990.
- Kaynaklı Ö., Yamankaradeniz R. A comparision between H_2 O-LiBr and NH_3-H_2 O solutions in single absorption refrigeration system. Dokuz Eylul University Faculty of Engineering Journal of Science and Engineering 2003; 5(2): 73-87.
- Kızılkan Ö., Şencan A., Kalogirou SA. Thermoeconomic optimization of a LiBr absorption refrigeration system. chemical engineering and processing 2007; 46: 1376-1384.
- Liao X. The development of an air-cooled absorption chiller concept and its integration in CHP systems. Degree of Doctor in İnstitute of Science Maryland University, page no: 172, College Park, USA, 2014.
- Liu Z., Yang S., Deng C. Optimal design and analysis of a cascade LiBr-H_2 O absorption refrigeration-transcritical CO_2 process for low-grade waste heat recovery. Energy Conversion and Management 2019; 192: 232-242.
- Özen DN., Yağcıoğlu KÇ. Thermodynamic and exergy analysis of an absorption cooling system for LiBr-H_2 O fluid couple. Selcuk University Journal of Engineering Science and Technology 2019; 7(1): 135-145.
- Soliman AS., Zhu S., Xu L., Dong J., Cheng P. Design of an LiBr-H_2 O absorption system using PCMs and powered by automotive exhaust gas. Applied Thermal Engineering 2021; 191: 116881.
- Yaniktepe B., Kara O., Ozalp C. Technoeconomic evaluation for an installed small-scale photovoltaic power plant. International Journal of Photoenergy 2017; 2017: 1-7.
Ayrıntılar
| Birincil Dil | İngilizce |
|---|---|
| Konular | Makine Mühendisliği |
| Bölüm | Araştırma Makaleleri (RESEARCH ARTICLES) |
| Yazarlar | |
| Yayımlanma Tarihi | 23 Şubat 2022 |
| Gönderilme Tarihi | 17 Aralık 2021 |
| Kabul Tarihi | 3 Şubat 2022 |
| Yayımlandığı Sayı | Yıl 2022 Cilt: 5 Sayı: Özel Sayı |
Kaynak Göster
Cited By
Energy analysis of the absorption cooling cycle from the waste heat of the hospital sterilization unit
Environmental Progress & Sustainable Energy
https://doi.org/10.1002/ep.14305
* Uluslararası Hakemli Dergi (International Peer Reviewed Journal)
* Yazar/yazarlardan hiçbir şekilde MAKALE BASIM ÜCRETİ vb. şeyler istenmemektedir (Free submission and publication).
* Yılda Ocak, Mart, Haziran, Eylül ve Aralık'ta olmak üzere 5 sayı yayınlanmaktadır (Published 5 times a year)
* Dergide, Türkçe ve İngilizce makaleler basılmaktadır.
*Dergi açık erişimli bir dergidir.
Bu web sitesi Creative Commons Atıf 4.0 Uluslararası Lisansı ile lisanslanmıştır.