Thermal performance and pressure drop of counter-flow and parallel-flow heat-pipe heat exchangers with aligned tube rows
TL;DR: In this paper, a numerical calculation of thermal performance and pressure drop for heat-pipe heat exchangers with aligned tube rows is presented and discussed, where the variation of the number of rows and columns from 1 to 6 for a total of 36 arrangements are presented.
Abstract: This paper presents a numerical calculation of thermal performance and pressure drop for heat-pipe heat exchangers with aligned tube rows. In this study the variation of the number of rows and columns from 1 to 6 for a total of 36 arrangements are presented and discussed. From the present results, an optimum arrangement of heat-pipe heat exchanger could be obtained.
Citations
More filters
TL;DR: In this paper, the performance of the concentric tube shell assisted heatpipe heat exchanger with and without adiabatic section has been experimentally investigated and water is used as a heat carrying fluid.
Abstract: Thermal performance of the concentric tube shell assisted heat-pipe heat exchanger with and without adiabatic section has been experimentally investigated. Water is used as a heat-carrying fluid an...
7 citations
Cites background from "Thermal performance and pressure dr..."
...Hsieh and Huang (1988) presented the numerical calculation for the improvement of thermal performance and the decrementof pressuredrop for heat-pipeheat exchangerwith aligned tube rows....
[...]
13 Nov 2014
TL;DR: In this paper, the authors compared the sewer heat recovery with heat pumps using geothermal energy storage systems for a small community shared water heating system including commercial and institutional buildings, and found that the heat exchanger method is relatively economical as it has the smallest rate of return on investment for the selected community size.
Abstract: The consumption of hot water represents a significant portion of national energy consumption and contributes to concerns associated with global climate change. Utilizing heat recovered from the sewer, or the stored heat by utilizing heat pumps with a borehole geothermal energy storage system, are simple and effective ways of heating water for domestic purposes. Reclaiming heat from the waste warm water that is discharged to the sewer or stored heat in a borehole geothermal energy storage system can help reduce natural gas energy consumption as well as the associated energy costs and greenhouse gas emissions. In this paper, sewer waste heat recovery is compared with heat pumps using geothermal energy storage systems for a small community shared water heating system including commercial and institutional buildings. It is found that the sewer heat exchanger method is relatively economical as it has the smallest rate of return on investment for the selected community size. The findings also demonstrate a reduction occurs in natural gas consumption and fewer CO2 gas emissions are emitted to the atmosphere. The results are intended to allow energy technology suppliers to work with communities while accounting appropriately for economic issues and CO2 emissions associated with these energy technologies.
5 citations
Cites background from "Thermal performance and pressure dr..."
...A counter flow heat exchanger is considered the ideal type among heat exchangers for the recovery of waste heat energy [10]....
[...]
TL;DR: In this article, a numerical calculation and comparison of thermal performance and pressure drop for heatpipe heat exchangers with aligned/staggered tube rows is presented, where the variations of the number of rows and columns from 1 to 6 for a total 36 arrangements are presented and discussed.
2 citations
TL;DR: In this paper, theoretical and experimental analyses of horizontal heat pipe heat exchangers for air conditioning applications using distilled water as the working fluid were performed using 20 copper tubes of 9.5mm outside diameter arranged in two rows with a 0.3-m evaporator length, a condenser length, and 12 fins per inch of aluminum plate fins.
Abstract: The literature review indicates that, though water has a good figure of merit, very limited information is available on the use of water as the working fluid in a horizontal heat pipe heat exchanger for air conditioning applications. This article investigates theoretical and experimental analyses of horizontal heat pipe heat exchangers for air conditioning applications using distilled water as the working fluid. This heat pipe heat exchanger study consists of 20 copper tubes of 9.5 mm outside diameter arranged in two rows with a 0.3 m evaporator length, a 0.3 m condenser length, a 0.05 m adiabatic length, and 12 fins per inch of aluminum plate fins. A comparative analysis is studied for two configurations of heat pipe heat exchangers. The first configuration of heat pipe heat exchanger consists of a single wick structure with two layers of 180 mesh of phosphor bronze wire mesh, and, in the second configuration, the heat pipe heat exchanger consists of a composite wick structure (two layers of 180 mesh and...
1 citations
References
More filters
TL;DR: The third edition of the second edition as discussed by the authors was published in 1964 and contains basic test data for eleven new surface configurations, including some of the very compact ceramic matrices, in both the English and the Systeme International (SI) system of units.
Abstract: This third edition is an update of the second edition published in 1964. New data and more modern theoretical solutions for flow in the simple geometries are included, although this edition does not differ radically from the second edition. It contains basic test data for eleven new surface configurations, including some of the very compact ceramic matrices. Al dimensions are given in both the English and the Systeme International (SI) system of units.
3,049 citations
TL;DR: In this paper, the Nusselt number for a wide range of packing materials and tube arrangements is given for randomly packed beds and compact (void fraction less than 0.65) staggered tube bundles.
Abstract: Previously obtained experimental heat transfer data have been collected and are illustrated along with minor variations of the standard correlations. Analysis of data for heat transfer in randomly packed beds and compact (void fraction less than 0.65) staggered tube bundles indicates that the Nusselt number for a wide range of packing materials and tube arrangements is given by
provided NRe ≥ 50. The correlations presented in this paper are not necessarily the most accurate available; however, they have wide application, are easy to use, and are quite satisfactory for most design calculations.
1,048 citations
TL;DR: In this article, the characteristics of counter-flow heat exchanger units, using heat pipes or two-phase closed thermosyphons as the heat-transfer element, are studied experimentally and a simple analytical model is developed to predict the performance of such units using thermophysics.
51 citations
TL;DR: In this article, a method of analysis for the thermal performance of heat pipe heat exchangers based on the conductance model was developed in order to calculate the convective heat transfer coefficients in tube banks.
31 citations