Energy analysis of evacuated tube solar collector integrating phase change material in northeast China

Wu Y., Tong X., Li D., Arici M., Liu C., Liu Y., ...Daha Fazla

JOURNAL OF ENERGY STORAGE, cilt.55, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 55
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.est.2022.105772
  • Dergi Adı: JOURNAL OF ENERGY STORAGE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Anahtar Kelimeler: Energy performance, Evacuated tube solar collector, PCM, Thermophysical parameters, Effective heat collection, THERMAL PERFORMANCE, WATER-HEATER, U-TUBE, STORAGE, SYSTEM, OPERATION
  • Kocaeli Üniversitesi Adresli: Evet

Özet

Evacuated tube solar collectors (ETSCs) are one of the most popular collector types with regard to solar energy utilization. However, the poor energy performance of ETSCs results in equal timeliness with solar energy. Incorporating phase change material (PCM) into ETSCs is regarded as a novel strategy to alleviate the challenge by means of enhancing their thermal energy storage capacity and improving energy performance. Since thermophysical parameters of PCM have a vital influence on energy performance of ETSCs, the present work aims to identify the effects of density, specific heat capacity, latent heat, thermal conductivity, and melting temperature of PCM on energy performance of ETSCs. The findings exhibit that increasing the density, specific heat capacity and melting temperature of PCM, the peak outlet temperature of heat transfer fluid and effective heat collection of ETSCs containing PCM decreases, while temperature time lag and effective heat collection time increases. Compared with ETSCs containing PCM with density of 425 kg/m(3), the effective heat collection time is prolonged up to 44.41 % for the scheme with PCM density of 1700 kg/m(3). Utilization of PCM with higher melting temperature is beneficial to enhance energy performance of ETSCs, which the maximum effective heat collection is increased by 4.31 % for ETSCs containing PCM with melting temperature of 333-335 K. However, increasing the values beyond 1700 kg/m(3), 1 W/(m.K), 4000 J/(kg.K) and 247,500 J/kg in cold regions of northeast China are not beneficial.