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Received: 7 September 2019 Accepted: 25 January 2020 In this paper heat transfer and critical heat flux is investigated in the Linear Fresnel Collector. At first, the balance of energy in the absorber was used for the modeling of direct steam generation in the Fresnel solar plant. In the following, thermal analysis has been executed in three different mass flow rates and single and dual tubes. Eventually Critical Heat Flux and distribution of vapor quality are studied from the start of the fluid flow until critical heat flux. How to determine the critical heat flux is important so that the amount of Critical Heat Flux is obtained from the comparison of inlet heat flux and vapor quality with data in Look up table. Noteworthy, in this study, water is picked out as heat transfer fluid because considered system is Direct Steam Generation. From the analysis, the temperature of the internal tube surface cut down on in the amount of 1.6 percent in mode of double tubes than single tube. Also, critical heat flux’s length and vapor quality respectively increased in the amount of 25.2 and 9 percent. However, the point of critical heat flux has been postponed with reducing of fluid flow rate and increasing of tube numbers.

Effect of Tube Number on Critical Heat Flux and Thermal Performance in Linear Fresnel Collector Based on Direct Steam Generation