Abstract

A clear understanding of heat transfer in fluid flow is often analyzed via heat input through a channel which has been thoroughly validated. Common refrigerants and light alcohols possess intrinsic heat transfer properties at supercritical conditions that are desirable for low- and mid-temperature sourced power cycles. In this experiment, heat transfer characteristics of novel fluids applied to a supercritical power cycle are controlled and analyzed in a pumped loop system. The controlled test section heat exchanger in designed in two phases: alpha design phase for initial validation of the test apparatus with non-corrosive fluids; and a beta design for tests of corrosive/hazardous fluids with improved high-pressure capability. The test section provides heat input to the fluid through discrete heat pipes that allow for the continuous measurement of heat transfer properties of local fluid packets along the length of the heat exchanger. Performance and heat transfer measures from the system are compared to similar experiments in the literature to validate the methodology. The system demonstrates the ability to isolate heat transfer properties of fluids in the pseudocritical region and their transitions. This experiment guides the design for further study of fluids of interest.

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