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This paper presents the thermal analysis in the helical coil of coil-contract-shell type heat exchanger (CCS).This in use helical coil is applied through increasing the lateral contact surface area by rolling. This process causes a pipe with a round cross-section (OC) to be converted to a pipe that is flat. (FC) and make it hydraulic diameter increase. Three FC samples were tested using water at 50 ◦C as the working medium and the flow rate was controlled between 0.2-2.5 l/min under constant tube surface temperature conditions. The FC with the highest hydraulic diameter had an average 21% reduction in total heat transfer and reduced convection capacity compared to the FC sample with the lowest hydraulic diameter, with flow rate is an auxiliary factor. This test showed an average increase in heat energy transfer over the flanks. 37% in the example FC with the maximum hydraulic diameter. This result is beneficial for the CCS heat exchanger because it transfers the heat energy on the side in contact with the conductor storage tank. Compared to FC with similar OC hydraulic dimmer has a high total heat transfer, but most of the heat is transferred to the insulated side.
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