主表面換熱器(或稱複熱器)設計與微型燃氣渦輪機整合在一起，以回收從渦輪機出來的廢熱，並提高發動機循環的熱效率。本研究工作包含了設計和分析，其設計目標是更高的效率和更低的壓力損失。
本研究設計了幾種具有主表面的換熱器，並對主要表面幾何形狀進行了設計計算。利用有限元商業軟體（ANSYS）用於對換熱器的幾何形狀進行建模，網格劃分和分析。從設計中獲得的結果；總壓降在設計的允許極限內，效率為81.8％，在設計2中，儘管壓力損失僅比限制稍大，但其效率約為83.4％，這比參考Capstone模型的效率86.4%小。

Primary surface recuperator have been designed for integration with the micro gas turbine to recover waste heat coming out of the turbine and to improve the thermal efficiency of the engine cycle. This work covers the design and the analyses with the objective of higher effectiveness and lower pressure loss.
The recuperator with a primary surface has been designed. A finite element commercial package (ANSYS) is used for modelling, meshing and analyses of recuperator geometry.
Design calculations were carried out for primary surface geometry. The results obtained from the design; the total pressure drop is within allowable limit (4%) for design 1 and the effectiveness is 81.8% and in design 2 though the pressure loss is just little more than the limitation its effectiveness is about 83.4% which is little less than that of reference capstone model with effectiveness upto 86.4% .

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