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Author: David Yashar

Displaying records 1 to 10 of 46 records.
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1. An Experimental and Computational Study of Approach Air Distribution for Slanted and A-Shaped Finned-Tube Heat Exchangers
Published: 7/1/2014
Authors: David A Yashar, Piotr A Domanski, Hong Hyun Cho
Abstract: One of the most influential factors of the performance of a finned tube heat exchanger is the distribution of the air passing through it; therefore it must be known in order to produce a highly efficient design. We examined two different common styl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913438

2. Beyond Standard Efficiency Ratings
Published: 5/6/2014
Author: David A Yashar
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915884

3. Evaluation of Energy Consumption Rating Methods for Thermoelectric Wine Chillers and Compact Refrigerators
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7963
Published: 10/21/2013
Authors: David A Yashar, Young-Jin Baik
Abstract: Most types of refrigerating appliances are rated according to an established test procedure and their energy use is regulated by the US Department of energy. These products are generally built around a vapor compression system that is used to maintai ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914637

4. Improving the Performance of a Roof Top Air-Conditioning Unit by Refrigerant Circuitry Optimization
Series: Technical Note (NIST TN)
Report Number: 1806
Published: 8/2/2013
Authors: David A Yashar, Sunil Lee
Abstract: This study demonstrates the performance improvement of an air-to-air roof top unit (RTU) achieved by optimizing an evaporator‰s refrigerant circuitry using evolutionary algorithms. The subject of this study is a unit with a cooling capacity of 7. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914090

5. 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

6. 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

7. 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

8. 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

9. 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

10. EVAP-COND, Version 3
Published: 9/22/2011
Authors: Piotr A Domanski, David A Yashar
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902404



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