Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Mark A. Kedzierski (Assoc)

Displaying 76 - 100 of 131

Effect of CuO Nanoparticle Concentration on R134A/Lubricant Pool Boiling Heat Transfer

January 6, 2008

Author(s)

Mark A. Kedzierski

This paper quantifies the influence of CuO nanoparticle concentration on the boiling performance of R134a/polyolester mixtures on a roughened, horizontal flat surface. Nanofluids are liquids that contain dispersed nano-size particles. Two lubricant based

Measurement and Modeling of Turbulent Flow in Water Supply Systems and Its Effect on Contaminant Transport

November 4, 2007

Author(s)

Stephen J. Treado, Nicos Martys, Mark A. Kedzierski, Stephanie S. Watson, Kenneth D. Cole

This paper describes the results of a measurement and modeling research project investigating the transport, accumulation and removal of contaminants from within water supply systems, including piping, fittings and fixtures. The traditional approach for

Horizontal Convective Boiling of Pure and Mixed Refrigerants Within a Micro-Fin Tube

October 4, 2007

Author(s)

Mark A. Kedzierski

Effect of CuO Nanolubricant on R134a Pool Boiling Heat Transfer with Extensive Measurement and Analysis Details

October 1, 2007

Author(s)

Mark A. Kedzierski

This paper quantifies the influence of CuO nanoparticles on the boiling performance of R134a/polyolester mixtures on a roughened, horizontal, flat surface. Nanofluids are liquids that contain dispersed nano-size particles. A lubricant based nanofluid

Effect of Lubricant on R410A Horizontal Flow Boiling

September 27, 2007

Author(s)

N N. Sawant, Mark A. Kedzierski, J S. Brown

The paper experimentally quantified the effect of lubricant on horizontal flow boiling of R410A. This was accomplished by first establishing a baseline by measuring the convective boiling heat transfer performance of pure R410A. The heat transfer

Effect of CuO Nanoparticle Concentration on R134a/Lubricant Pool Boiling Heat Transfer With Extensive Analysis

September 20, 2007

Author(s)

Mark A. Kedzierski

Effect of Refrigerant Oil Additive on R134a and R123 Boiling Heat Transfer Performance

January 1, 2007

Author(s)

Mark A. Kedzierski

This paper investigates the effect that an additive had on the boiling performance of an R134a/polyolester lubricant (POE) mixture and an R123/naphthenic mineral oil mixture on a roughened, horizontal flat surface. Both pool boiling heat transfer data and

Contamination and Decontamination of Building Plumbing Systems

September 25, 2006

Author(s)

Stephen J. Treado, Mark A. Kedzierski, Stephanie S. Watson, Kenneth D. Cole

The quality of drinking water has always been a subject of interest. In fact, a stable and secure supply of clean drinking water is a hallmark of modern society. Recently, new concerns have arisen regarding the potential occurrence of intentional or

Development of a Fluorescence Based Measurement Technique to Quantify Water Contaminants at Pipe Surfaces During Flow

September 1, 2006

Author(s)

Mark A. Kedzierski

This paper provides a detailed account of the development of a fluorescence based measurement technique for measuring the mass of contaminant on solid surfaces in the presence of water flow. A test apparatus was design and developed for the purpose of

Influence of Concentration and Additives on R123/Paraffinic Material Oil Boiling Heat Transfer Performance (NISTIR 7336)

September 1, 2006

Author(s)

Mark A. Kedzierski, D H. Han

This paper investigates the effect that oil concentration had on the boiling performance of an R123/paraffinic mineral oil mixture on a roughened, horizontal flat surface. For all compositions, the lubricant caused a heat transfer degradation relative to

Report of Phase One Measurement and Analysis of Building Water System Contamination and Decontamination

July 3, 2006

Author(s)

Stephen J. Treado, Mark A. Kedzierski, Stephanie S. Watson, Dale P. Bentz, Nicos Martys, Kenneth D. Cole

This report describes the results of the first phase of a research project to evaluate how contaminants accidentally or intentionally introduced into the water supply might accumulate in building plumbing systems, and how these contaminants might be

A Comparison of R245fa Pool Boiling Measurements to R123, and R245fa/Isopentane on a Passively Enhanced, Horizontal Surface

April 3, 2006

Author(s)

Mark A. Kedzierski

This study presents pool boiling heat transfer measurements for R245fa, R123 and a mixture of R245fa and isopentane on a flattened passively enhanced low-pressure boiling surface. Possibly because the enhanced surface was flattened from a round tube, its

Horizontal Convective Boiling of Refrigerants and Refrigerant Mixtures Within a Micro-Fin Tube

July 1, 2005

Author(s)

L J. Hamilton, Mark A. Kedzierski, M P. Kaul

This paper presents local convective boiling measurements in a micro-fin tube for four pure refrigerants: R22, R32, R125, and R134a; and four refrigerant mixtures: R410B (R32/125, 45/55 % mass), R32/R134a (28/72 % and 30/70% mass) and, R407C (R32/125/134a

Effect of Bulk Lubricant Concentration on the Excess Surface Density During R134a Pool Boiling with Extensive Measurement and Analysis Details

June 1, 2005

Author(s)

Mark A. Kedzierski

This paper investigates the effect that the bulk lubricant concentration has on the non-adiabatic lubricant excess surface density on a roughened, horizontal flat pool-boiling surface. Both pool boiling heat transfer data and lubricant excess surface

Effect of Bulk Lubricant Concentration on the Excess Surface Density During R134a Pool Boiling

January 21, 2005

Author(s)

Mark A. Kedzierski

Effect of Refrigerant Oil Additive on R134a and R123 Boiling Heat Transfer Performance and Related Issues for GSA.

December 1, 2004

Author(s)

Mark A. Kedzierski

Pressure Drop During Refrigerant Condensation Inside Horizontal Smooth, Helical Micro-Fin, and Herringbone Micro-Fin Tubes

October 6, 2004

Author(s)

J A. Olivier, L Liebenberg, Mark A. Kedzierski, J P. Meyer

This paper presents a study of pressure drops during condensation inside a smooth, an 18 helical micro-fin, and a herringbone micro-fin tube. Measurements were conducted with refrigerant flowing through the inner tube (inner diameter of 8 to 9 mm) and

Letter Report of a Life Cycle Cost Analysis for GSA Chillers

September 2, 2004

Author(s)

Mark A. Kedzierski

A life-cycle-cost analysis revealed that the combined GSA regions would save nearly half a billion dollars over 15 years in electricity costs with a hypothetical 30 % increase in chiller efficiency. The largest savings were apparent for GSA regions 2, 4, 7

Improved Thermal Boundary Layer Parameter for Semi-Theoretical Refrigerant/Lubricant Pool Boiling Model

August 1, 2003

Author(s)

Mark A. Kedzierski

This paper outlines the framework for an improvement in the thermalboundary layer parameter for a semi-theoretical model for predicting thepool boiling heat transfer of refrigerant/lubricant mixtures on aroughened, horizontal, flat pool-boiling surface

Micro Channel Heat Transfer, Pressure Drop and Macro Prediction Methods

June 1, 2003

Author(s)

Mark A. Kedzierski

Advances in the basic understanding of fluid physics have opened an era of unprecedented application of heat transfer processes, and fluid dynamics systems using micro channels. One of the greatest obstacles to the application of leading edge fluid physics

A Semi-Theoretical Model for Predicting Refrigerant/Lubricant Mixture Pool Boiling Heat Transfer

May 1, 2003

Author(s)

Mark A. Kedzierski

This paper outlines the development of a semi-theoretical model for prediction the pool boiling heat transfer of R123/lubricant mixtures on a roughened, horizontal flat pool-boiling surface. The predictive model is based on the mechanisms involved in the

Condensation (Chapter 15)

January 1, 2003

Author(s)

Mark A. Kedzierski, J C. Chato, T J. Rabas

Condensation is the process by which a vapor is converted to its liquid state. Because fo the large internal energy difference between the liquid and vapor states, a significant amount of heat can be released during the condensation process. For this

A Generalized Pressure Drop Correlation for Evaporation of Alternative Refrigerants in Micro-Fin and Smooth Tubes

October 1, 2001

Author(s)

J Y. Choi, Mark A. Kedzierski, Piotr A. Domanski

This paper presents a pressure drop correlation for evaporation and condensation in smooth and micro-fin tubes. The correlation was developed from a data base consisting of the following pure and mixed refrigerants: R125, R134a, R32, R410A (R32/R125 50/50

Generalized Pressure Drop Correlation for Evaporation and Condensation in Smooth and Micro-Fin Tubes

October 1, 2001

Author(s)

J Y. Choi, Mark A. Kedzierski, Piotr A. Domanski

Effect of Bulk Lubricant Concentration on the Excess Surface Density During R123 Pool Boiling

July 1, 2001

Author(s)

Mark A. Kedzierski

This paper investigates the effect that bulk lubricant concentration has on the non-adiabatic lubricant excess surface density on a roughened, horizontal flat pool-boiling surface. Both pool boiling heat transfer data and lubricant excess surface density