Heat Transfer at Pool Boiling of Mixtures with R22 - Purdue e-Pubs

Purdue University
Purdue e-Pubs
International Refrigeration and Air Conditioning
Conference
School of Mechanical Engineering
1988
Heat Transfer at Pool Boiling of Mixtures with R22
and R114
D. Gorenflo
Universitat Gesamthochschule Paderborn
P. Blein
Universitat Gesamthochschule Paderborn
G. Herres
Universitat Gesamthochschule Paderborn
W. Rott
Universitat Gesamthochschule Paderborn
H. Schomann
Universitat Gesamthochschule Paderborn
See next page for additional authors
Follow this and additional works at: http://docs.lib.purdue.edu/iracc
Gorenflo, D.; Blein, P.; Herres, G.; Rott, W.; Schomann, H.; and Sokol, P., "Heat Transfer at Pool Boiling of Mixtures with R22 and
R114" (1988). International Refrigeration and Air Conditioning Conference. Paper 61.
http://docs.lib.purdue.edu/iracc/61
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Authors
D. Gorenflo, P. Blein, G. Herres, W. Rott, H. Schomann, and P. Sokol
This article is available at Purdue e-Pubs: http://docs.lib.purdue.edu/iracc/61
WITH R22
HEAT TRANSFER AT POOL BOILING OF MIXTURES
A1:!IUlil.1.
nn. and P. Sokol
D. Gorenflo. P. Blein. G. Herres, W. Rott. H. Schbma
Univer sitat Gesamthochschule Paderb orn
Paderb orn, Pohlweg 55. FRG
ient, u, at pool boiling were
The phase equilib rium and the heat transfe r coeffic
of the system R22(CHF 2 Cl) nents
compo
pure
the
and
es
measur ed with eight mixtur
n the critical pressur e of each
R114(C2F4C12 ). The saturat ion pressu re varied betwee
of the system deviate s less than
mixtur e and~ 20% of this pressur e. The critical line
of the pure compo nents but
atures
temper
critical
the
of
e
averag
I Kfrom the molar
averag e or the critical
molar
the
than
reaches pressur es up to " 2 bar higher
of vapor and liquid is found to
itions
compos
the
n
betwee
nce
differe
The
es.
pressur
at the lowest saturat ion pressur e
be greates t at" 35 mol% of R22 in the liquid and
line. As is known from the
critical
the
at
investi gated. The difference vanish es
transfe r coefficient, u . decreas es
heat
the
s,
milture
of
boiling
pool
about
re
literatu
transfe r coefficients for the pure
below the corresp onding molar averag e of the heat
nced when the saturat ion
pronou
more
and
more
ng
compo nents, the effect becomi
depend ence of a on heat
tile
more,
pressu re approa ches the critical pressur e. Further
than with the pure
es
mixtur
the
with
less
is
re
pressu
ion
f!UI and saturat
the literatu re shows
in
u
for
ues
techniq
ting
correla
compo nents. A compar ison with
method propos ed by Schlilnder.
a compa rativel y good agreem ent with a correla ting
JRANSEERT DE CHALEUR LORS DE L'EBULLITlON...l.J!llili
D!lS MELANGES DE R22 ET PER 114
coefficient de transfe rt de chaleu r a
RESUME : On a me sure I equilib re de phase et le
les compo sants purs du system e
lors de I ebullition libre pour 8 melanges et
saturat ion variait entre Ia p(essio n
de
n
pressio
La
).
zF1Cl2
Ri14(C
F2Cll
R22(CH
pression. La courbe critique du
critiqu e de cbaque melange et environ 20% de celte
molatre des temper atures critiqu es
ne
moyen
Ia
de
K
I
de
mains
de
ecarte
s
e
system
superie ures d'envir on 2 bars ii. Ia
des compo sants purs, mais aueint des pressio ns
que Ia differe nce entre les
trouve
On
s.
critique
ns
pressio
moyen ne molaire des
i environ 35 moles% de
grande
plus
Ia
est
liquide
du
compositions de Ia vapeur et
basse etudiee . Cette
plus
Ia
ion
saturat
de
R22 dans le liquide et a la pressio n
on le sait d'apres Ia litterat ure sur
differe nce dispara it ii. Ia courbe critique . Com me
transfe rt de chaleur u diminu e au!'ebulli tion libre des melanges, le coefficient de
e des coefficients de transfe r! de
ondant
corresp
dessou s de Ia moyenn e molaire
t de plus en plus net lorsque Ia
chaleu r pour les compo sants purs. l'effet devien
. De plus. I influence du flux
critique
n
pressio
Ia
de
che
s'appro
ion
saturat
de
n
pressio
moindre avec les melanges
est
a
sur
ion
saturat
de
n
thermi que et de Ia pressio
ues de correla tion de
techniq
les
avec
aison
qu avec les compos ants purs. Une compar
concordance ave une method e
bonne
assez
une
itre
appara
fait
ure
!itterat
la
a d'apres
de correla tion propose par Schlllnder.
Th~s
of the IJR
paper appea rs in the July 1988 issue
on page 257.
142