Detailed analyses and simulations of heat transfer have been carried out on an e vacuated tube for solar- powered adsorption refrigerator

including inhomogen eous radiation heat transfer between its inner and outer tubes

two adjacent tubes

tube and back plate

sun light reflection on back plate

etc.A a new cost-effect iveness parameter is applied to analyze the structure parameters

including diam eter of evacuated tube

distance between two adjacent tube centers and the thick ness of adsorbent.Some results are obtained which show that evacuated tubes with a larger diameter can result in a higher temperature and better performance.Whe n the thickness of adsorbent equals to 10?mm and the distance between two adjac ent tube centers equals to 2.5 times the diameter

the best economic p erformance can be obtained.