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Showing 1 to 20 of 318 for “"Heat exchangers"”.
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Sensitivity study of plate heat exchangers
Thesis (M.S.)--Michigan State University. Dept. of Agricultural Engineering, 1973
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Flow -Induced Noise in Heat Exchangers
… of the flow-induced noise produced by plate heat exchangers, arrays of cylinders, cylinders in tandem, side by side cylinders, single cylinders of constant diameter and ""hourglass"" shaped cylinders inside a rectangular duct have been made. The acoustic field in parts of the duct in which …
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Drawn Polymer Fiber Recuperative Heat Exchangers
Polymer microchannel heat exchangers for use in cryocooler applications have been developed. These heat exchangers are manufactured using a thermal drawing process where a bulk polymer preform is heated and stretched. The process results in channels with a characteristic dimension of 50-100 µm and …
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Developing Innovative Heat Exchangers in a Small-Medium Enterprise: Modelling and Implementation of Pillow Plate Heat Exchangers
… solutions has driven innovative approaches in heat exchanger design, with Pillow Plate Heat Exchangers (PPHEs) emerging as a promising technology. After a concise but complete overview on the available scientific literature, this research explores the design, experimental validation, and …
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Flow induced acoustic resonances in heat exchangers.
… into the acoustic phenomenon in in-line tubular heat exchangers subjected to cross flow. The flow through such a heat exchanger can result in the production of very high noise levels, which occur as a result of the excitation of an acoustic standing wave in the cavity between the tube rows. This …
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Flow distribution in brazed plate heat exchangers
Brazed plate heat exchangers (BPHEs) have been widely used in the heating, ventilating, air conditioning, and refrigeration (HVAC&R) industry for their compactness and high heat transfer coefficient. However, they suffer from the flow maldistribution among parallel plate channels. Especially when …
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The Method of Constructal Design in Heat Exchangers
… applying the Constructal design methodology of heat exchangers to the thermal and flow performance of such architectures. Based on the method of Constructal design, the system performance can be enhanced by providing its architecture or configuration more freedom to morph. Throughout this …
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Pressure drop in headers of microchannel heat exchangers
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Mitigating fouling of heat exchangers with fluoropolymer coatings
Fouling is a chronic problem in many heat transfer systems and results in the need for frequent heat exchanger (HEX) cleaning. In the dairy industry, the associated operating cost and environmental impact are substantial. Antifouling coatings are one mitigation option. In this work, the fouling …
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Analytical and Experimental Study on Coaxial Borehole Heat Exchangers
… geothermal energy considering a coaxial borehole heat exchanger (BHE) as a major component in a ground-source heat pump (GSHP) system. A GSHP system is a sustainable energy system that transfers thermal energy between the surrounding ground and the conditioned space of a building. Various methods …
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Heat transfer coefficients of particulate in tubular heat exchangers
This experimental study explores the heat transfer from heated bare and finned tubular surfaces to particulates in packed bed cross flow. The results from this experiment will be used to help select the type of particulates that will be used. Additionally, these results will assist in estimating …
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Shell-side transfer in shell-and-tube heat exchangers
… electrochemical technique. A simple model of a heat exchanger with segmental nickel tube joined to p.v.c. rods replaced the exchanger tubes. Measurements were made for both no-Ieakage, semi-leakage and total leakage configurations. Baffle-spacings of 47.6 mm, 66.6 mm, 97 mm and 149.2 mm wer …
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Air-side condensate management: Drainage channels in heat exchangers
… on the air-side surface of flat-tube air-cooling heat exchangers can result in several adverse effects on the overall thermal-hydraulic performance. In order to improve the performance of compact heat exchangers under wet-surface conditions, promoting the drainage of condensed water is critical. …
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The void fraction in headers of microchannel heat exchangers
In HVAC&R systems, microchannel heat exchangers (MCHEs) are commonly used with the advantages of compactness, the potential for reduction of charge, and improvement of heat transfer performance compared to other traditional heat exchangers. The void fraction in the headers affects the thermal …
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Probing the liquid-vapor interface in microstructured heat exchangers
… the liquid-vapor interface in microstructured heat exchangers. The two aspects include: design and fabrication of a custom vacuum chamber faceplate and the investigation of the liquid meniscus shape on microstructured devices. The faceplate for the vacuum chamber consisted of two metal …
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The use of magnesium-alloy tubing in heat exchangers
… aluminum, monel and stainless steel when used as heat exchanger tubes. Two single pass, double pipe heat exchangers were constructed using pyrex glass tubes as outer shells. The pyrex tubes were two inches inside diameter, 2.25 inches outside diameter, five feet long and had flared ends. Each end …
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Metal foams as novel materials for air-cooling heat exchangers
… they are being considered for a range of heat transfer applications. In this experimental study, open-cell aluminum metal foam is considered as a replacement for conventional louvered fins in brazed-aluminum heat exchangers. Closed-loop wind tunnel experiments are conducted to measure the …
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Design and manufacturing of novel hybrid metal-polymer heat exchangers
Nearly 60% of waste heat from industrial processes in the U.S. lies in low-temperature regime (<200°C). Current conventional metal heat exchangers for waste heat recovery (WHR) of low-grade heat are too expensive and subject to corrosion from condensates below <150°C. Polymers, although an …
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Design and manufacturing of novel hybrid metal-polymer heat exchangers
… industrial processes is in the form of low-grade heat (200◦C). Materials and maintenance costs of common heat exchangers are typically too high to justify their usage. Polymers, though more affordable, are usually unsuitable for heat exchanger applications due to their low thermal conductivity (∼ …
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Numerical optimisation and theoretical analysis of complex microchannel heat exchangers
… of the geometries in forced convective heat transfer and steady state laminar incompressible fluid flow. Microchannel heat sinks used were numerically modelled from highly conductive (aluminium) solid material substrate. ANSYS FLUENT Response Surface Optimisation Tool (RSO) was used to …
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