Index Catalog // ScholarsArchive@OSU

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
Full Text:: operate efficiently at high incident flux (>140 W cm-2) using supercritical carbon dioxide as the working

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
Full Text:: (W cm-2) P R = 1.1, G = 500 (kg m-2s-1), q = 50 (W cm-2) Threshold Figure 14: L+ values for

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
Full Text:: ) hfv(kJ kg −1) ρl/ρv µl/µv σ × 10−3(N m−1) R134a 1492 145.7 14.2 10.0 4.3 R450A 1304 141.1 15.3 9.54

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
Full Text:: ) Subscripts L Liquid phase r Refrigerant w Water V Vapor phase Page 5 of 29 1

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
Full Text:: 11.5 T o ta l C o o li n g C a p a c it y ( k W ) Membrane system VC SEER 14 VC SEER 16

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
Full Text:: wide range of experimen- tal parameters including test section applied heat flux (20 ≤ q′′ ≤ 40 W cm-2

In-Tube condensation of zeotropic refrigerant R454C from superheated vapor to subcooled liquid

Creator:: Jacob, Tabeel A. and Fronk, Brian M.
Abstract:: This article investigates the in-tube, superheated, saturated, and subcooled condensation of zeotropic refrigerant mixture R454C. R454C is proposed to replace R404A for commercial refrigeration applications. Quasi-local heat transfer coefficients were measured in a 4.7 mm horizontal tube at mass fluxes ranging from 100 to 500 kg m−2 s−1 at three different saturation...
Resource Type:: Article
Full Text:: Vapor viscosity × 106 (kg m-2 s-1) 14.5 13.8 Liquid conductivity × 103 (W m-1 K-1) 52.7 65.7 Surface

Comparison of R404A condensation heat transfer and pressure drop with low global warming potential replacement candidates R448A and R452A

Creator:: Jacob, Tabeel A., Matty, Ethan P., and Fronk, Brian M.
Abstract:: The objective of this paper was to measure and compare the heat transfer coefficient and pressure drop of R404A and two potential replacement candidate refrigerants with a lower global warming potential, R448A and R452A. Experiments were conducted inside a 4.7 mm horizontal tube at mass fluxes ranging from 100 to...
Resource Type:: Article
Full Text:: kg -1 k thermal conductivity W m-1 K-1 l length of a segment m ln natural logarithm - ṁ mass

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
Full Text:: solar radiation of 790 and 700 W m-2 is required by the ASHRAE 93 and EN 12975-2 standards

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
Full Text:: �̇�𝑚 Mass flow rate (kg/s) ΔP Pressure drop (Pa) �̇�𝑄𝑏𝑏 Power input (W) ρ Fluid

ScholarsArchive@OSU

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

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

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

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

Simulation of membrane heat pump system performance for space cooling

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

In-Tube condensation of zeotropic refrigerant R454C from superheated vapor to subcooled liquid

Comparison of R404A condensation heat transfer and pressure drop with low global warming potential replacement candidates R448A and R452A

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

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

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