دورية أكاديمية
Investigating the performance of heat exchangers in absorption heat pump systems using both numerical and experimental methods
| العنوان: | Investigating the performance of heat exchangers in absorption heat pump systems using both numerical and experimental methods |
|---|---|
| المؤلفون: | Wu, Zhangxiang, Jiang, Yan, Wang, Yaran, You, Shijun, Zhang, Huan, Liu, Sujie, Fan, Xianwang, Pu, Jiaxuan, Wan, Zhihao, Sha, Li, Wei, Shen |
| المصدر: | Energy Conversion and Management , 278 , Article 116744. (2023) |
| بيانات النشر: | Elsevier BV |
| سنة النشر: | 2023 |
| المجموعة: | University College London: UCL Discovery |
| مصطلحات موضوعية: | Absorption heat pump, Heat exchanger, Numerical model, Working fluid pair, Frost distribution characteristic |
| الوصف: | To achieve better heating efficiency and lower CO2 emission, this study has proposed an air source absorption heat pump system with a tube-finned evaporator, a vertical falling film absorber, and a generator. To analyze both heat and mass transfer performances and optimize the sizes of both the absorber and the generator, a distributed parameter model and a two-dimensional numerical model have been adopted, both validated. To develop an environmentally efficient working fluid pair for absorption heating for cold climate, a calculation method adopting fugacity and activity models was developed. The defrosting control strategy of this system was developed based on a spatial and temporal frost development model, which determines the characteristics of frost distribution, frost growth, and frost inhomogeneity. To evaluate the functionality of this system, a test rig was constructed, with a heating capacity of 36.88 kW, a coefficient of performance of 1.54 under evaporation temperature and supply water temperature of −9.2 °C and 38.4 °C, respectively. Validation results showed a 1.5 % higher prediction accuracy for the two-dimensional model with correction, comparing to the distributed parameter model. R134a-DMF and R161-DMF were recommended at an ambient temperature of −2 °C. This is because with ambient temperature of −7 °C and supply water temperature of 41 °C, the predicted coefficient of performance was 1.04 and 1.06 for R134a-DMF and R161-DMF, respectively. The frost prediction indicated that at the time of 3,600 s, the thickness of the frost layer in the heavy frost area was 0.94 mm, with a total frost mass of 3,995 g. Compared with the initial stage, the sensible and latent heat transfer rates decreased by 22.1 % and 24.2 %, respectively. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | text |
| اللغة: | English |
| العلاقة: | https://discovery.ucl.ac.uk/id/eprint/10164748/2/Wei_Investigating%20the%20performance%20of%20heat%20exchangers%20in%20absorption%20heat%20pump%20systems%20using%20both%20numerical%20and%20experimental%20methods_AAM.pdfTest; https://discovery.ucl.ac.uk/id/eprint/10164748Test/ |
| الإتاحة: | https://discovery.ucl.ac.uk/id/eprint/10164748/2/Wei_Investigating%20the%20performance%20of%20heat%20exchangers%20in%20absorption%20heat%20pump%20systems%20using%20both%20numerical%20and%20experimental%20methods_AAM.pdfTest https://discovery.ucl.ac.uk/id/eprint/10164748Test/ |
| حقوق: | open |
| رقم الانضمام: | edsbas.FA5B5D4A |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |