Index Catalog // ScholarsArchive@OSU

Geometry and orientation effects in non-uniformly heated microchannel heat exchangers using supercritical carbon dioxide

Creator:: Jajja, Saad A., Sequeira, Jessa M., and Fronk, Brian M.
Abstract:: There is growing interest to use supercritical carbon dioxide (sCO2) as a working fluid in thermal management applications. This study investigates the thermal-hydraulic performance of microchannel heat sinks as a function of flow channel geometry and orientation at operating conditions representative of electronics cooling applications. Three different experimental test sections,...
Resource Type:: Article

Experimental investigation of supercritical carbon dioxide in horizontal microchannels with non-uniform heat flux boundary conditions

Creator:: Jajja, Saad A., Zada, Kyle R., and Fronk, Brian M.
Abstract:: Supercritical carbon dioxide (sCO2) experiences a drastic change in its thermophysical properties near the thermodynamic critical point. A non-linear thermophysical property variation can influence the heat transfer behavior of sCO2 which is not predicted well by conventional single phase heat transfer theory. This can become a major hindrance in the...
Resource Type:: Article

Investigation of the combined efficiency of a solar/gas hybrid water heating system

Creator:: Karki, Saroj, Haapala, Karl R., and Fronk, Brian M.
Abstract:: In climate regions with large seasonal variations in solar radiation, such as the Pacific Northwest of the United States, a solar thermal energy collector might not economically satisfy year-round domestic water heating demands, requiring an auxiliary unit, such as a natural gas-fired water heater. Previous studies have shown that the...
Resource Type:: Article

Simulation of membrane heat pump system performance for space cooling

Creator:: Bukshaisha, Ahmad A. and Fronk, Brian M.
Abstract:: Membrane based heat pumps systems have attracted the attention of many research groups as a potentially more environmentally friendly alternative to vapor compression systems for space cooling. Several prototype systems have been developed, with reported claims of Energy Efficiency Ratios (EER) approaching 26. At present, no detailed analysis is publicly...
Resource Type:: Article

Optimization of 3D printed liquid cooled heat sink designs using a micro-genetic algorithm with bit array representation

Creator:: Dokken, Connor B. and Fronk, Brian M.
Abstract:: The advancement of additive manufacturing enables significantly greater freedom of design compared to conventional techniques. Of significant interest is the potential improvements in the design of cold plates and heat sinks for electronics cooling. Greater design freedom could enable new designs that reduce thermal resistance and hydraulic resistance, enabling the...
Resource Type:: Article

Simulation of thermal hydraulic performance of multiple parallel micropin arrays for concentrating solar thermal applications with supercritical carbon dioxide

Creator:: Hyder, Matthew B. and Fronk, Brian M.
Abstract:: Concentrated solar power (CSP) plants have the potential to provide 24 h, renewable electricity. Current CSP systems have high capital and operational costs which makes the levelized cost of electricity uncompetitive with conventional techniques. Recent experimental research has shown the potential of small unit cells (up to 2 × 2 cm) containing micropin arrays...
Resource Type:: Article

Two-phase flow regimes of condensing R-134a at low mass flux in rectangular microchannels

Creator:: Vanderputten, Michael A., Jacob, Tabeel A., Sattar, Maria, Ali, Nouman, and Fronk, Brian M.
Abstract:: Qualitative two-phase flow regime data are obtained from high-speed visualization of condensing flows of R-134a at mass fluxes from 75 to 150 kg m−2 s−1 and quality from 0.1 to 0.8 in square microchannels (DH = 0.84 mm) cooled from a single side. Superheated R-134a is distributed into multiple parallel microchannels and then partially condensed, using...
Resource Type:: Article

Evaluation of Governing Heat and Mass Transfer Resistances in Membrane Based Energy Recovery Ventilators with Internal Support Structures

Creator:: Armatis, Paul D. and Fronk, Brian M.
Abstract:: Energy recovery ventilators (ERVs) are an effective way to reduce energy consumption in buildings while satisfying ventilation standards. As membrane technology and manufacturing methods improve, membrane based ERVs are seeing increased market penetration. In the present study, the feasibility of membrane ERV designed to fit in a commercial building wall...
Resource Type:: Article

Numbering-Up of Microscale Devices for Megawatt-Scale Supercritical Carbon Dioxide Concentrating Solar Power Receivers

Creator:: Zada, Kyle R., Hyder, Matthew B., Drost, M. Kevin, and Fronk, Brian M.
Abstract:: Concentrated solar power (CSP) plants have the potential to reduce the consumption of nonrenewable resources and greenhouse gas emissions in electricity production. In CSP systems, a field of heliostats focuses solar radiation on a central receiver, and energy is then transferred to a thermal power plant at high temperature. However,...
Resource Type:: Article

Evaluation of Heat and Mass Transfer Models for Sizing Low-Temperature Kalina Cycle Microchannel Condensers

Creator:: Fronk, Brian M. and Zada, Kyle R.
Abstract:: Waste heat driven ammonia/water Kalina cycles have shown promise for improving the efficiency of electricity production from low-temperature reservoirs (T < 150 °C). However, there has been limited application of these systems to utilize widely available, disperse, waste heat streams for smaller scale power production (1–10 kWe). Factors limiting increased deployment of these...
Resource Type:: Article

High-Flux Thermal Management With Supercritical Fluids

Creator:: Fronk, Brian M. and Rattner, Alexander S.
Abstract:: A novel thermal management approach is explored, which uses supercritical carbon dioxide (sCO2) as a working fluid to manage extreme heat fluxes in electronics cooling applications. In the pseudocritical region, sCO2 has extremely high volumetric thermal capacity, which can enable operation with low pumping requirements, and without the potential for...
Resource Type:: Article

Experimental Investigation of In-Tube Condensation of Low GWP Refrigerant R450A using a Fiber Optic Distributed Temperature Sensor

Creator:: Jacob, Tabeel A., Matty, Ethan P., and Fronk, Brian M.
Abstract:: Heat transfer coeﬃcients and frictional pressure drop values are experimentally measured during condensation of R134a and its proposed low global warming potential (GWP) replacement, R450A. R450A is a non-ﬂammable zeotropic mixture of R134a and R1234ze (42/58% by mass). Experiments were conducted in a horizontal tube (ID = 4.7 mm) for...
Resource Type:: Article

ScholarsArchive@OSU

Geometry and orientation effects in non-uniformly heated microchannel heat exchangers using supercritical carbon dioxide

Experimental investigation of supercritical carbon dioxide in horizontal microchannels with non-uniform heat flux boundary conditions

Investigation of the combined efficiency of a solar/gas hybrid water heating system

Simulation of membrane heat pump system performance for space cooling

Optimization of 3D printed liquid cooled heat sink designs using a micro-genetic algorithm with bit array representation

Simulation of thermal hydraulic performance of multiple parallel micropin arrays for concentrating solar thermal applications with supercritical carbon dioxide

Two-phase flow regimes of condensing R-134a at low mass flux in rectangular microchannels

Evaluation of Governing Heat and Mass Transfer Resistances in Membrane Based Energy Recovery Ventilators with Internal Support Structures

Numbering-Up of Microscale Devices for Megawatt-Scale Supercritical Carbon Dioxide Concentrating Solar Power Receivers

Evaluation of Heat and Mass Transfer Models for Sizing Low-Temperature Kalina Cycle Microchannel Condensers

High-Flux Thermal Management With Supercritical Fluids

Experimental Investigation of In-Tube Condensation of Low GWP Refrigerant R450A using a Fiber Optic Distributed Temperature Sensor

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