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Author: David Yashar

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1. Performance Improvement of a Roof Top Air-Conditioning Unit by Refrigerant Circuitry Optimization
Published: 1/26/2013
Authors: Sunil Lee, David A Yashar, Piotr A Domanski
Abstract: In this experiment-aided simulation study, we achieved the performance improvement of a Roof Top Unit (RTU) by optimizing an evaporator’s refrigerant circuitry using evolutionary algorithms. The system used in this study was a 2-stage 7.5 Ton RTU wit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912072

2. A Dual Mode Evolutionary Algorithm Approach for Designing Optimized Finned-Tube Heat Exchangers
Published: 9/27/2012
Authors: David A Yashar, Piotr A Domanski, Janusz Wojusiak, Kenneth Kaufman
Abstract: The efficiency of a vapor compression system is strongly influenced by the performance of the finned-tube heat exchangers it employs. Heat exchanger performance is strongly influenced by the refrigerant circuitry, i.e., the connection sequence of th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907663

3. Development of a Method to Measure the Energy Consumption of Automatic Icemakers in Domestic Refrigerators with Single Speed Compressors
Series: Technical Note (NIST TN)
Report Number: 1759
Published: 9/18/2012
Author: David A Yashar
Abstract: This study examines the energy consumption of automatic ice makers installed in domestic refrigerators. This study builds upon the findings of a previous study and examines two refrigerator-freezers of different configurations, one French-door units ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911272

4. Energy Consumption of Automatic Ice Makers Installed in Domestic Refrigerators, Revision 1
Series: Technical Note (NIST TN)
Report Number: 1697-2011
Published: 12/7/2011
Authors: David A Yashar, Ki-Jung Park
Abstract: This study examines the energy consumption of automatic ice makers installed in domestic refrigerators. The purpose of this research is to determine a method of measuring the energy consumption of automatic ice makers that will generate a repeatab ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910220

5. IMPACT OF VARIABLE ANTI-SWEAT HEATERS ON REFRIGERATOR FREEZER ENERGY CONSUMPTION
Series: NIST Interagency/Internal Report (NISTIR)
Published: 9/27/2011
Authors: David A Yashar, Ki-Jung Park
Abstract: Anti-sweat heaters are often used to prevent condensation from forming on the outer surface of refrigerated cabinets. Variable anti-sweat heaters (VASH) represent a novel approach to saving energy through monitoring the environmental conditions sur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909169

6. An Experimental and Computational Study of Approach Air Distribution for a Finned-Tube Heat Exchanger
Published: 9/21/2011
Author: David A Yashar
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908825

7. Practical Aspects of Applying Evolutionary Algorithms for Optimizing Refrigerant Circuitry in Heat Exchangers
Published: 8/21/2011
Authors: Piotr A Domanski, David A Yashar, Sunil Lee, Janusz Wojtusiak
Abstract: A public domain finned-tube heat exchanger simulation program, EVAP-COND ver. 3.0, has been equipped with an evolutionary algorithm-based module, called ISHED – Intelligent System for Heat Exchanger Design, which facilitates optimization of refrigera ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908309

8. Energy Consumption of Automatic Ice Makers Installed in Domestic Refrigerators (NIST TN 1697)
Series: Technical Note (NIST TN)
Report Number: 1697
Published: 4/1/2011
Authors: David A Yashar, Ki-Jung Park
Abstract: This study examines the energy consumption of automatic ice makers installed in domestic refrigerators. The purpose of this research is to determine a method of measuring the energy consumption of automatic ice makers that will generate a repeatable ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907664

9. Characterization of Approach Air Distribution for a Finned-Tube Heat Exchanger
Published: 2/18/2011
Authors: David A Yashar, Piotr A Domanski, Hong H. Cho
Abstract: The distribution of air flow approaching a finned-tube heat exchanger is one of the predominant factors influencing the heat exchanger’s performance. This paper describes a method for measuring and predicting the inlet air flow distribution using Par ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903642

10. Air Flow Distribution through an A-Shaped Evaporator under Dry and Wet Coil Conditions
Published: 7/11/2010
Authors: David A Yashar, Piotr A Domanski
Abstract: This paper presents a study of the air flow distribution through a residential air-conditioning heat exchanger. The test subject was a finned-tube, A-shaped coil outfitted with a condensation collection pan required for horizontal installation. We ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905426