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Search Publications by: Piotr A. Domanski (Assoc)

Displaying 326 - 350 of 361

Limiting Throttling Losses by Intracycle Evaporative Cooling

October 20, 1996

Author(s)

B. S. Kim, Piotr A. Domanski

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 heat

Evaluation of Flammable Refrigerants for Use in a Water-to-Water Residential Heat Pump

September 3, 1996

Author(s)

D K. Choi, Piotr A. Domanski, David Didion

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

Intracycle Evaporative Cooling in a Vapor Compression Cycle (NISTIR 5873)

September 1, 1996

Author(s)

B. S. Kim, Piotr A. Domanski

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 is

Minimizing Throttline Losses in the Refrigeration Cycle

August 1, 1995

Author(s)

Piotr A. Domanski

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 cycle

Theoretical Evaluation of the Vapor Compression Cycle With a Liquid-Line/Suction-Line Heat Exchanger, Economizer, and Ejector (NISTIR 5606)

March 1, 1995

Author(s)

Piotr A. Domanski

The report presents a theoretical analysis of three vapor compression cycles which are derived from the Rankine cycle by incorporating a liquid-line/suction-line heat exchanger, economizer, or ejector. These addendums to the basic cycle reduce throttling

Simulation Model and Study of Hydrocarbon Refrigerants for Residential Heat Pump Systems

May 10, 1994

Author(s)

Piotr A. Domanski, David Didion, W. J. Mulroy, J Parise

To conduct a systematic study of Natural Fluids as working fluids for heat pumping applications, it was necessary for NIST to simultaneously expand its analytical tools and evaluate what design changes American industry would most readily accept. The

Evaluation of Suction Line-Liquid Line Heat Exchange in the Refrigeration Cycle

January 1, 1994

Author(s)

Piotr A. Domanski, David Didion, J. P. Doyle

The paper presents a theoretical evaluation of the performance effects resulting from the installation of a liquid-line/suction-line heat exchanger (LLSL-HX). It examines cycle parameters and refrigerant thermodynamic properties that determine whether the

Glide Matching With Binary and Ternary Zeotropic Refrigerant Mixtures. Part 1. An Experimental Study

January 1, 1994

Author(s)

W. J. Mulroy, Piotr A. Domanski, David Didion

An improvement of the coefficient of performance (COP) of the refrigeration cycle can be realized when temperature profiles of the refrigerant mixture and the heat transfer fluid (HTF) are matched. For the same temperature lift, the benefit of glide

Glide Matching With Binary and Ternary Zeotropic Refrigerant Mixtures. Part 2. A Computer Simulation

January 1, 1994

Author(s)

Piotr A. Domanski, W. J. Mulroy, David Didion

The glide-matching study presented in Part 1 was a laboratory investigation which demonstrated the evaporator performance in detail. However, since it was not possible to instrument the condenser sufficiently, some computer simulation work was conducted

Simulation of an Evaporator with Nonuniform One-Dimensional Air Distribution

January 13, 1991

Author(s)

Piotr A. Domanski

This paper presents a simulation model of a plate-fin, air-to-refrigerant heat exchanger used as an evaporator in residential air conditioning. The model can account for nonuniform air-distribution between coil tubes and simulates refrigerant distribution

EVSIM: An Evaporator Simulation Model Accounting for Refrigerant and One Dimensional Air Distribution (NISTIR 89-4133)

August 1, 1989

Author(s)

Piotr A. Domanski

The report describes a computer model, EVSIM, of a refrigerant-to-air heat exchanger of the type used in residential air conditioning as an evaporator. The model provides performance predictions of a one-slab or two-slab evaporator for a given refrigerant

An Experimental Investigation and Modeling of the Flow Rate of Refrigerant 22 Through the Short Tube Restrictor (NISTIR 89-4120)

July 1, 1989

Author(s)

D. A. Aaron, Piotr A. Domanski

Refrigerant 22 flow through short tube restrictors was investigated. The analysis pertained to initially subcooled refrigerant flowing through short tubes with 5 L/D 20. The flow conditions studied were those typically found in heat pumps. Flow

Rating procedure for mixed air-source unitary air conditioners and heat pumps operating in the cooling mode - revision 1

May 1, 1989

Author(s)

Piotr A. Domanski

A procedure is presented for determining the cooling performance ratings of air-source unitary air conditioners and heat pumps consisting of a condensing unit and an indoor section which were not tested together as a system. The procedure allows