Abstract: 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.