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Author: piotr domanski

Displaying records 111 to 120 of 135 records.
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111. Potential Coefficient of Performance Improvements due to Glide Matching With R-407C
Published: 7/1/1998
Authors: M E Marques, Piotr A Domanski
Abstract: Potential improvements of the Coefficient of Performance (COP) were investigated for R-407C at cooling and heating conditions of a residential heat pump. The study used CYCLE-11, a semi-theoretical vapor-compression cycle model, which was upgraded t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860757

112. A Study of a Water-to-Water Heat Pump Using Flammable Refrigerants
Published: 6/1/1998
Authors: William V Payne, Piotr A Domanski, J Muller
Abstract: This investigation compared the performance of R22 to the performance of R290 and that of flammable zeotropic mixtures, R32/290 and R32/152a. The tests were conducted in a test apparatus specially designed to simulate a residential water-to-water hea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860762

113. Method for Estimating the Energy Efficiency Ratio of Mixed System Air Conditioners and Heat Pumps (NISTIR 6045)
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6045
Published: 9/1/1997
Authors: Piotr A Domanski, B. S. Kim
Abstract: In lieu of testing each split system air conditioner and heat pump combination, an empirically based calculation procedure may be used for estimating a unit's Energy Efficiency Ratio at the 35 deg C (95 deg F) rating condition, EER(95). The procedure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910465

114. Ternary Zeotropic Mixture With CO2 Component for R-22 Heat Pump Application
Published: 8/30/1997
Authors: K Maczeck, J Muller, K Wojtas, Piotr A Domanski
Abstract: The objective of this research project was to demonstrate a successful operation of a high efficiency heat pump employing a zeotropic mixture with a zero ozone-depletion and a small greenhouse warming potential (ODP and GWP, respectively). The projec ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910470

115. Impact of Air and Refrigerant Maldistributions On the Performance of Finned-Tube Evaporators With R-22 and R-407C
Series: OTHER
Published: 7/1/1997
Authors: J Lee, Piotr A Domanski
Abstract: The report presents basic features of the evaporator model, EVAP5M, and simulation results for an evaporator operating with R-22 and R-407C at non-uniform air and refrigerant distributions. EVAP5M was developed under this project to provide a tool fo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910468

116. Performance of R-22 Alternative Refrigerants in a System With Cross-Flow and Counter-Flow Heat Exchangers (NISTIR 5945)
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 5945
Published: 1/1/1997
Authors: M H Kim, Piotr A Domanski, David Didion
Abstract: This report presents results of performance tests of R-22 and four alternative fluids, R-134a, R-32/134a (30/70), R-407C, and R-410A, at operating conditions typical for a residential heat pump. The study was performed in an experimental breadboard w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910467

117. Limiting Throttling Losses by Intracycle Evaporative Cooling
Published: 10/20/1996
Authors: B. S. Kim, Piotr A Domanski
Abstract: The temperature glide of zeotropic mixtures during phase change provides the opportunity to limit throttling losses of the refrigerant leaving the condenser. The difference between the intracycle evaporative cooling and the liquid-line/suction-line h ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910512

118. Evaluation of Flammable Refrigerants for Use in a Water-to-Water Residential Heat Pump
Published: 9/3/1996
Authors: D K Choi, Piotr A Domanski, David Didion
Abstract: This paper evaluates the performance of R-22, R-290, R-290/600a (70/30), and R-32/152a (50/50) for application in a water-to-water residential heat pump for space cooling and heating. The tests were performed in a laboratory apparatus at different co ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910472

119. Intracycle Evaporative Cooling in a Vapor Compression Cycle (NISTIR 5873)
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 5873
Published: 9/1/1996
Authors: B. S. Kim, Piotr A Domanski
Abstract: The temperature glide of zeotropic mixtures during phase change provides the opportunity to limit throttling losses of the refrigeration cycle by intracycle evaporative cooling of the refrigerant leaving the condenser. Intracycle evaporative cooling ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910511

120. Minimizing Throttline Losses in the Refrigeration Cycle
Published: 8/1/1995
Author: Piotr A Domanski
Abstract: Most alternative non-CFC refrigerants have a large molecular structure and large heat capacity, which influence the slope of saturated liquid line and result in substantial throttling losses in a basic reversed Rankine cycle. These losses degrade the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910532



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