Dynamic modelling and simulation of the tubular adsorber of a solid adsorption machine powered by solar energy

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Dynamic modelling and simulation of the tubular adsorber of a solid adsorption machine powered by solar energy

ارائه دهنده: Provider: abolfazl hashemi

اساتید راهنما: Supervisors: Dr.habibullah sayehvand

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr.fazlullah eskandari manjily and Dr.mohsen goodarzi

زمان و تاریخ ارائه: Time and date of presentation: 2023/02/28

مکان ارائه: Place of presentation: Technical and engineering amphitheater

چکیده: Abstract: In this thesis, the modeling of heat and mass transfer in the tubular absorber of a solar collector related to a refrigeration system is presented. Adsorbent modeling and analysis are key factors in such studies. . This adsorbent is heated by solar energy and contains a porous medium consisting of activated carbon 35AC-, which reacts with methanol by adsorption. The obtained results show the daily thermal behavior of the tubular absorber. The performance of the machine is discussed for a case study involving the m21 surface of the solar flat collector which is integrated with nine copper tubes. The tubes contain a pair of activated carbon - 35AC/methanol. Several main factors affecting solar and thermal performance have been discussed according to the results of computer simulations, and the relationship between cycle performance and these factors has been investigated. The simulation has been done for Hamedan weather conditions, which corresponds to the total daily radiation of 19.72 MJ⁄m^2 and the average temperature of the environment is 20.7℃. The results showed that the performance of the system in terms of COPs and COPth strongly depends on the temperatures operation (evaporation temperature, condensation temperature and absorption temperature) depends. The surface of the solar collector plays an important role in determining the performance of the system. So that both COPs and COPth decrease with increasing solar collector surface area. For a tube with the optimum inner radius of the absorber (54.55 mm) per square meter of solar collector surface, the optimal performance of the system is equal to COPth = 0.462 and COPs = 0.148. It was also observed that the type of collector configuration has a great difference in system performance. In the area of 21 m2 of the collector surface in Hamedan weather conditions, TIM coating had the highest solar performance coefficient compared to double-walled and single-walled covers