Category: AIR COOLED

Did you know that you can save a case in a different version of Xchanger Suite? This tutorial shows how to identify which version you are working in and how to save and open in a different version....
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For many exchanger designs, having plugged tubes in the bundle is necessary. This tutorial will demonstrate to users how to model plugged tubes in Xace....
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Winterization in accordance with API 661 Annex C may need to be considered by designers when air cooled heat exchangers are operating in climatic extremes. In order to prevent operating problems in-situ, a temperature safety margin should be added to the critical process temperature to determine the specified minimum tubewall temperature....
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Subcooling is often required for air cooled condensers. This webinar will address common technical support questions such as – how many tubes and passes are needed to subcool sufficiently? how is phase separation modeled? what are the best modeling guidelines for Xace? – and provide HTRI's recommendations. Attending this webinar will...
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Header flow maldistribution and pressure loss in air-cooled heat exchangers may significantly affect performance. Most relevant literature focuses on plate-fin and cylindrical channel headers for tubular heat exchangers. The flow in the header is affected by its internal geometry, the orientation of the nozzles on the header, and inlet flow velocity....
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This report documents research on the effects of tube pitch and number of rows on heat transfer and pressure drop for air-cooled heat exchangers. Seven tube bundles were tested at isothermal and non-isothermal operating conditions with varied airside Reynolds numbers. Using the data from these tests, HTRI evaluated and improved existing...
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This webinar highlights the accomplishments of HTRI Research over the past year and describes how HTRI members can benefit from these developments. We briefly discuss airside studies with our air cooler unit, vacuum condensation experiments with hydrocarbon mixtures, new phase change methods for plate heat exchangers, subcooling with shellside condensation, and...
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Component: Xace Applicable to: All supported versions (versions 7.3 and 8) Date posted: 15 April 2019   Air-cooled heat exchangers are typically designed for operation with all fans on. A bay with two, three, or four operating fans is commonly identified as 2×50%, 3×33%, or 4×25% fans, indicating that each operating...
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Salem A. Bouhairie, Senior Project Engineer, Research Both tubeside and airside behavior affect the overall performance of an air cooler. Two concerns with air-cooled heat exchanger (ACHE) operation are two-phase process-side maldistribution in headers and misrated airside fan performance. At HTRI’s Research & Technology Center (RTC), we are developing plans to...
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Air coolers use fans to drive the cooling air over the tube bundle. The number of fans in operation may be less than the total number of fans installed, such as in scenarios where operations are winterized or where extra fans are installed for redundancy. This webinar will look at how...
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To ensure reliable data collection, HTRI always seeks to improve test methods and incorporate innovative techniques. Recently installed at the Research & Technology Center, the Air-cooled Unit (ACU) has motivated us to develop better ways of collecting airside measurements for both forced- and natural-draft testing. Accurate measurements for natural-draft (fans off)...
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Component: Xace Applicable to: All supported versions (7.3 and 8) Date posted: 4 March 2008 Last updated: 25 March 2019   Air-cooled heat exchangers are typically designed for operation with all fans on. For a bay with two, three, or four operating fans, this operation is commonly indicated as 2×50%, 3×33%...
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After summarizing the results from HTRI Research over the past year, this webinar provides insights into how these results improve our technology and its use by HTRI members. Topics include prediction of hot air recirculation for air coolers, development of new non-Newtonian heat transfer correlations, modification of tubeside falling film heat...
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A new Stream Analysis Method option is available in Xace® 6 to model flow bypassing in air-cooled heat exchangers with larger gaps at the edge of the bundle than those required by the API 661/ISO 13706-1:2005 standard. The heat transfer and pressure drop of the bundle can be less than predicted...
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In 2014 HTRI contracted with the Institute of Process and Environmental Engineering (IPEE) at Brno University of Technology, Brno, Czech Republic, to complete CFD simulations on six configurations of a two-pass horizontal air cooler, differing only in the number and type of inlet and outlet nozzles. Results showed the impact of...
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During winter or in turndown conditions when full design duty is not required, air-cooled heat exchangers commonly run with one or more fans off. Xace® models this operation by allowing users to specify an inlet flow maldistribution. This article provides guidelines for modeling fans-off operation in Xace and describes a computational...
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