scholarly journals Low Cost Polymer heat Exchangers for Condensing Boilers

2015 ◽  
Author(s):  
Thomas Butcher ◽  
Rebecca Trojanowski ◽  
George Wei ◽  
Michael Worek
Keyword(s):  
Heat Exchangers ◽  
Low Cost ◽  
Polymer Heat Exchangers

Scalable 3D Bicontinuous Fluid Networks: Polymer Heat Exchangers Toward Artificial Organs

2015 ◽  
Vol 27 (15) ◽  
pp. 2479-2484 ◽  
Author(s):  
Christopher S. Roper ◽  
Randall C. Schubert ◽  
Kevin J. Maloney ◽  
David Page ◽  
Christopher J. Ro ◽  
...  
Keyword(s):  
Heat Exchangers ◽  
Artificial Organs ◽  
Fluid Networks ◽  
Polymer Heat Exchangers

Polymer Heat Exchangers: An Enabling Technology for Water and Energy Savings

2011 ◽  
Author(s):  
Juan G. Cevallos ◽  
Frank Robinson ◽  
Avram Bar-Cohen ◽  
Hugh Bruck
Keyword(s):  
Polymer Composites ◽  
Case Studies ◽  
Heat Exchangers ◽  
Energy Savings ◽  
Embodied Energy ◽  
Enabling Technology ◽  
Current Trends ◽  
Thermoelectric Energy ◽  
Polymer Heat Exchangers

Polymer heat exchangers (PHXs), using thermally-enhanced composites, constitute a “disruptive” thermal technology that can lead to significant water and energy savings in the thermoelectric energy sector. This paper reviews current trends in electricity generation, water use, and the inextricable relationship between the two trends in order to identify the possible role of PHXs in seawater cooling applications. The use of once-through seawater cooling as a replacement for freshwater recirculating systems is identified as a viable way to reduce the use of freshwater and to increase power plant efficiency. The widespread use of seawater as a coolant can be made possible by the favorable qualities of thermally-enhanced polymer composites: good corrosion resistance, higher thermal conductivities, higher strengths, low embodied energy and good manufacturability. The authors use several seawater cooling case studies to explore the potential water and energy savings made possible by the use of PHX technology. The results from three case studies suggest that heat exchangers made with thermally enhanced polymer composites require less energy input over their lifetime than corrosion resistant metals, which generally have much higher embodied energy than polymers and polymers composites. Also, the use of seawater can significantly reduce the use of freshwater as a coolant, given the inordinate amounts of water required for even a 1MW heat exchanger.

Compact and Low-Cost Heat Exchangers for an Undergraduate Laboratory

2002 ◽  
Vol 7 (2) ◽  
pp. 96-99
Author(s):  
F. Javier Peňas ◽  
Ana Elías ◽  
Astrid Barona
Keyword(s):  
Heat Exchangers ◽  
Low Cost ◽  
Undergraduate Laboratory

Design and Analysis of Thermoacoustic Refrigerators Using Air as Working Substance

2019 ◽  
Vol 27 (01) ◽  
pp. 1950008 ◽  
Author(s):  
B. G. Prashantha ◽  
S. Seetharamu ◽  
G. S. V. L. Narasimham ◽  
M. R. Praveen Kumar
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Low Cost ◽  
Design Strategies ◽  
Software Simulation ◽  
Design And Optimization ◽  
Theoretical Design ◽  
Resonator Design ◽  
Simulation Results ◽  
Thermoacoustic Refrigerators

In this paper, the design of 50 W thermoacoustic refrigerators operating with air as working substance at 10 bar pressure and 3% drive ratio for a temperature difference of 28 K is described. The design strategies discussed in this paper help in design and development of low cost thermoacoustic coolers compared to helium as the working substance. The design and optimization of spiral stack and heat exchangers, and the promising 0.2[Formula: see text] and 0.15[Formula: see text] resonator design with taper and divergent section with hemispherical end are discussed. The surface area, volume, length and power density of the hemispherical end design with air as working substance is found better compared to the published 10 and 50 W coolers using helium as the working substance. The theoretical design results are validated using DeltaEC software simulation results. The DeltaEC predicts 51.4% improvement in COP (1.273) at the cold heat exchanger temperature of [Formula: see text]C with air as working substance for the 50[Formula: see text]W 0.15[Formula: see text]TDH resonator design compared to the published 50[Formula: see text]W 0.25[Formula: see text]TDH resonator design with helium as working substance.

A review on polymer heat exchangers for HVAC&R applications

2009 ◽  
Vol 32 (5) ◽  
pp. 763-779 ◽  
Author(s):  
C. T'Joen ◽  
Y. Park ◽  
Q. Wang ◽  
A. Sommers ◽  
X. Han ◽  
...  
Keyword(s):  
Heat Exchangers ◽  
Polymer Heat Exchangers

Oxygen Liquefier Using a Mixed Gas Refrigeration Cycle

2003 ◽  
Author(s):  
Vijayaraghavan Chakravarthy ◽  
Joe Weber ◽  
Abdul-Aziz Rashad ◽  
Arun Acharya ◽  
Dante Bonaquist
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Low Cost ◽  
Rankine Cycle ◽  
Small Scale ◽  
Refrigeration Cycle ◽  
Mixed Gas ◽  
Unit Power ◽  
Design Selection ◽  
Pressure Swing

This paper presents the design, selection of equipment, testing, and analysis of a 2 TPD (76 kg/hr) prototype oxygen liquefier that employs a mixed gas refrigeration cycle. Small scale oxygen plants (30–60 TPD) based on VPSA systems (Vapor Pressure Swing Adsorption) periodically require liquid back-up to provide uninterrupted supply of O2 gas to customers during planned plant maintenance. Supply of liquid for back-up, especially to customers in remote locations, is expensive and difficult. Economically designed MGR liquefiers will fulfill this market need. The 2 TPD prototype O2 liquefier is based on the dual loop MGR Rankine cycle (see Figure 1). The forecooler loop provides refrigeration at the warm end (233K). R507 is used as a refrigerant for the forecooler in the warm end loop. The main refrigeration loop uses a mixture of R218, R14 and N2. The main advantage of separating the refrigerants into two different loops is to avoid freezing of high boiling point refrigerants at liquid O2 temperatures in the main refrigeration loop. The process and mixture composition were optimized using the HYSYS process simulation package. Very useful insights were gained in terms of reducing the irreversibilities in the heat exchanger. Low cost innovative designs were adopted for the heat exchangers. For example: (1) plate-and-frame heat exchangers were successfully used for multiple gas streams, (ii) a spirally wound coiled heat exchanger was used to liquefy oxygen. Similarly, the compressors used in the forecooler and main cycle were low cost, off-the-shelf items used in conventional refrigeration systems. The liquefier unit was initially demonstrated and a liquid making capacity of 1.5 TPD at a unit power of 44 kW/TPD was achieved. Subsequent modifications to the heat exchangers resulted in meeting the design expectations at a unit power of 37 kW/TPD.

A New Approach for Explicit Construction of Moldability Based Feasibility Boundary for Polymer Heat Exchangers

2011 ◽  
Author(s):  
Timothy Hall ◽  
Madan Mohan Dabbeeru ◽  
Satyandra K. Gupta
Keyword(s):  
Heat Exchangers ◽  
Intelligent Design ◽  
Nonlinear Process ◽  
Explicit Construction ◽  
Computational Experiments ◽  
Design Parameters ◽  
New Approach ◽  
Highly Nonlinear ◽  
Computationally Intensive ◽  
Polymer Heat Exchangers

Incorporating manufacturing feasibility is a very important consideration during the design optimization process and this paper is interested in investigating the molding feasibility of polymer heat exchangers. This application requires the explicit construction of the boundary, represented as a surface based on the parameter space, which separates the feasible and infeasible design space. The feasibility boundary for injection molding in terms of the design parameters is quite complex due to the highly nonlinear process physics, which, consequently, makes molding simulation computationally-intensive and time-consuming. Moreover, in heat exchanger applications, the optimal design often lies on the feasibility boundary. This paper presents a new approach for the explicit construction of a moldability-based feasibility boundary for polymer heat exchangers. The proposed approach takes inspiration from intelligent design of experiments and incorporates ideas from the field of active learning to minimize the number of computational experiments needed to construct the feasibility boundary. Our results show that the proposed approach leads to significant reduction in the number of computational experiments needed to build an accurate model of the feasibility boundary.

Optimization of Polymer Tube-Bundle Heat Exchangers Using a Genetic Algorithm

2011 ◽  
Author(s):  
Lingjun Meng ◽  
Anthony M. Jacobi
Keyword(s):  
Genetic Algorithm ◽  
Working Conditions ◽  
Heat Exchangers ◽  
Tube Bundle ◽  
Geometry Optimization ◽  
Objective Functions ◽  
Transfer Enhancement ◽  
Polymer Tube ◽  
The Cost ◽  
Polymer Heat Exchangers

Tube-bundle heat exchangers are widely utilized in gas-to-gas and gas-to-liquid applications, and interest remains high in improving the efficiency of these heat exchangers. Due to excellent resistance to fouling and corrosion, polymer heat exchangers have been mainly applied under extreme working conditions, where such concerns are important. Recently, however, there has been interest in using polymer heat exchangers as a substitute for conventional metallic heat exchangers in more general applications. The present study explores the optimization of bare polymer tube-bundle (PTB) heat exchangers and determines the cost effectiveness of PTB heat exchangers through comparisons to conventional metallic heat exchangers using a Genetic Algorithm (GA). Most of heat exchanger optimization studies have focused mainly on the physics of the fluid flow or heat transfer enhancement, and a detailed analysis including geometry and cost is rare. The present study is distinguished from others by focusing on objective functions involving cost under volume constraints and undertaking geometry optimization with sensitivity analysis.

Ocean Thermal Energy Conversion Heat Exchangers: A Review of Research and Development

1985 ◽  
Vol 22 (01) ◽  
pp. 64-73
Author(s):  
Eugene H. Kinelski
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Low Cost ◽  
Cost Effective ◽  
Department Of Energy ◽  
Test Facility ◽  
Working Fluid ◽  
Ocean Energy ◽  
The U.S ◽  
Mechanical Cleaning

The goal of the OTEC heat exchanger program within the Division of Ocean Energy Systems in the U.S. Department of Energy was to develop designs, evaluate enhanced surfaces, and control biofouling using corrosion-resistant materials that were cost-effective. This report summarizes the available data on a closed-cycle OTEC power system and shows how such data could be applicable to heat exchangers used by the power industry, the U.S. Navy, and merchant ships. Ammonia was selected as the best choice for an OTEC working fluid because of its superior thermodynamics properties at the temperatures involved and its low cost. It was chosen for the advanced tests of the prototypical shell-and-tube and compact heat exchangers. The most effective biocontrol procedure for maintaining clean heat transfer surfaces in the evaporators was intermittent chlorination with possibly periodic mechanical cleaning. Preliminary, short-term test data indicated that cold seawater (at the Seacoast Test Facility at Ke-ahole Point, Hawaii) does not appear to cause fouling in condensers; however, long-term data are still needed to determine the level of biocontrol needed. Titanium and the high-alloy stainless alloys, such as AL-6X and AL-29-4C, are expected to provide the 30-year life in OTEC systems. The use of aluminum alloys is predicated upon the reduction of frequency of mechanical cleaning (to remove biofouling) that will reduce the erosion-corrosion of the heat-transfer surfaces.

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