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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:: 550 kg m−2 s−1) and saturation conditions (45 ◦C and 55 ◦C). The measured pressure drop values and

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:: conditions (40, 50, and 60 ◦C). R448A and R452A are zeotropic refrigerant mixtures, with temperature glides

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:: be 41.97%, 39.82%, and 35.05% at initial water temperature of 20, 30, and 51.5 °C, respectively

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:: ranging from 100 – 500 kg m-2 s-1 at three different saturation conditions (40, 50 and 50 °C). The

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:: . Goetzler, R. Zogg, J. Young, and C. Johnson. Alternatives to HVAC Technology. ASHRAE Journal, 26:12–23

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:: flow maps and data and with one another Page 3 of 29 NOMENCLATURE c Specific heat (J kg

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:: Hydraulic Diameter (µm) Gmax Mass flux (kg m-2 s-1) i Specific enthalpy (J kg-1) Km Minor loss

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:: @oregonstate.edu (Brian M. Fronk) 20 40 60 80 100 Fluid Temperature (°C) 0 2 4 6 8 10 12 P ra n d tl

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:: the optimization process resulted in a design that reduced peak temperature from 53.02 °C to 46.10°C

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:: temperature.(a)G = 500 kg m-2s-1 and PR = 1.1(b)G = 500 kg m -2s-1 and PR = 1.03 (c) G = 1000 kg m-2s-1 and

ScholarsArchive@OSU

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

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

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

Simulation of membrane heat pump system performance for space cooling

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

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

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

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

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