Nucleate boiling characteristics of R-113 in a small enhanced tube bundle.

202 Pages·2.6 MB·en_US

by  Chilman, Scott V.;Marto, P. J.;Memory, Stephen B.

NAVAL POSTGRADUATE SCHOOL
Monterey, California
THESIS
NUCLEATE BOILING CHARACTERISTICS OF R-113
IN A SMALL ENHANCED TUBE BUNDLE
by
Scott V. Chilman
September 1991
Thesis Advisor P. J. Marto
Thesis Co-Advisor S. B. Memory
Approved forpublic release; distribution is unlimited.
T257774

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PERFORMINGORGANIZATIONREPORTNUMBER(S) MONITORINGORGANIZATIONREPORTNUMBER(S)
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Naval PostgraduateSchool (IfApplicable) NavalPostgraduate School
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Monterey, CA 93943-5000 Monterey,CA 93943-5000
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TITLE(IncludeSecurityClassification)
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NucleateBoilingCharacteristicsofR-l13 in aSmall EnhancedTubeBundle.
PERSONALAUTHOR(S)
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Chilman, Scott Vincent
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Master'sThesis FROM4/91 TO9/91 1991 September26 123
SUPPLEMENTARYNOTATION
The views expressed in this thesisare thoseoftheauthorand donotreflecttheofficial policyorposition oftheDepartmentof
Defenseorthe U.S. Government.
COSATICODES 18. SUBJECTTERMS (continueonreverse ifnecessaryandidentifybyblocknumber)
FIELD GROUP SUBGROUP Nucleation siteactivation/deactivation, hysteresis loop,
natural convectionandnucleatepoolboilingregions
ABSTRACT(Continueonreverse ifnecessaryandidentifybyblocknumber)
Heat transfer tests were carried out using a small enhanced tube bundle in a pool of R-l13. By accurately
instrumenting five tubes within the bundle, both the convective and nucleate boiling regions were studied in detail, with
emphasis on the "bundle' effect (i.e. theeffectoflowertubes in operation on upper tubes within the bundle). In addition, the
effect of surface history and pool height on nucleation site activation/deactivation was studied to see how this affects the
overall heat transferand in particular, the shape ofthe hysteresis loop. From the results, recommendations can be made to
improvestart-upprocedureson shipboard AC systems.
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ProfessorMarto [phone] 69 Mx
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Approved for public release; distribution is unlimited.
Nucleate Boiling Characteristics of R-113
in a Small Enhanced Tube Bundle
by
Scott V. Chilman
Lieutenant, United States Navy
B.S.M.E.T., California Maritime Academy, 1983
Submitted in partial fulfillment of the
requirements for the degree of
MASTER OF SCIENCE IN MECHANICAL ENGINEERING
from the
NAVAL POSTGRADUATE SCHOOL
September 1991
JtG. Aphony J. Healey, Chairman
Department of Mechanical Engineering
i i
ABSTRACT
Heat transfer tests were carried out using a small enhanced tube bundle in a pool of
R-l13. By accurately instrumenting five tubes within the bundle, both the convective and
nucleate boiling regions were studied in detail, with emphasis on the 'bundle' effect (i.e.
the effect of lower tubes in operation on upper tubes within the bundle). In addition, the
effect of surface history and pool height on nucleation site activation/deactivation was
studied to see how this affects the overall heat transfer and in particular, the shape of the
hysteresis loop. From the results, recommendations can be made to improve start-up
AC
procedures on shipboard systems.
in
TABLE OF CONTENTS
INTRODUCTION
I. 1
BACKGROUND
A.
.1
B. OBJECTIVES 3
LITERATURE SURVEY
II. 4
A. GENERAL INTRODUCTION 4
B. EXPERIMENTALAND THEORETICAL STUDIES 5
EXPERIMENTAL APPARATUS
III. 9
A. TEST APPARATUS OVERVIEW 9
AUXILIARY EQUIPMENT
B. 9
1. 8 Ton Refrigeration Unit ....9
2. EthyleneGlycoVWaterMixture 10
Pumps
3. 10
4. Flowmeters 10
C. DATA ACQUISITION SYSTEM/INSTRUMENTATION 10
D. EVAPORATOR/CONDENSER 11
E. GEOMETRY OFENHANCED SURFACE USED 14
1. Turbo-BTube 14
EXPERIMENTAL PROCEDURES
IV. 28
A. REMOVALOFTUBE BUNDLEFROMEVAPORATOR .28
B. BUNDLE DISASSEMBLY 28
SYSTEM CLEAN-UP
C. 29
D. SYSTEM REFIT 30
1 . Installation oftube bundle in evaporator 30
IV