<p>This paper is the second of a three part series to model and validate individual components for an in-rack cooling and heat recovery system. A model for a brazed plate heat exchanger (BPHE) acting as a condenser is presented. The condenser model can be applied in either the cooling loop or vapor recompression loop. Thus, the primary fluid enters as either superheated (vapor recompression loop) or saturated vapor (cooling loop), while the secondary fluid enters as a sub-cooled liquid. The model modifies an existing technique and is applied to condensation of R245fa. The model assumes a two-fluid heat exchanger with R245fa and water as the primary and secondary fluids, respectively, flowing in counterflow configuration. The 2-D model divides the heat exchanger geometry into a discrete number of slices to analyze the heat transfer and pressure drops (including static, momentum and frictional losses) of both fluids, which is used to predict the exit temperature and pressure of both fluids. The model predicts the exchanger duty based on the enthalpy change of the hot fluid. The predicted values of fluid output properties (water temperature and pressure, and refrigerant quality and pressure) compare well with experimental data collected from the cooling loop of the test system.</p>

Rack-Level Thermosyphon Cooling and Vapor-Compression Driven Heat Recovery: Condenser Model

Paper Proceedings: https://asmedigitalcollection.asme.org/InterPACK/InterPACK2021/volume/85505

ASME 2021 International Electronic Packaging Technical Conference and Exhibition (InterPACK2021)

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