graphite-polymer plate in frame heat exchanger
TRANSCRIPT
Leibniz-Institutfür PolymerforschungDresden
LeibnizGemeinschaft
Graphite-Polymer Plate in Frame Heat Exchanger
Plastic heat exchangers are the most reliable solution for heat transfer in an aggressive media environment. By using the latest technology of graphite filled thermoplastic composite, the thermal conductivity could be significantly increased (Fig. 1). The addition of graphite has quintupled the heat transfer coefficient (Fig 2).The heat exchanger plates can be made of different polymer matrices such as polypropylene (PP), polyvinylidene fluoride (PVDF) or polyethylene (PE) depending on the requirements for chemical resistance. The graphitic plates are stacked and clamped between two metal plates.The heat exchanger can be used for cooling, heating or condensing of corrosive media.
Fig.2 : Heat transfer coefficient (liquid/liquid) depending on the velocity between the plates
Applications
salt solutions: marine, aquarium, fish farmingacid-solutions: plating and chemical applicationssolvents: condensation applications electrolyte: battery cooling (redox-flow-battery)
0.4 0.6 0.8 1.00
500
1000
1500
2000
2500
3000
pure
polymer
velocity [m/s]
PP matrix
PVDF matrix
PE matrix
with 80 wt% graphite
0
5
10
15
20
25
30
35
40
ther
mal
co
nd
uct
ivit
y [W
/m·K
]
0
5
10
15
20
25
30
35
40
elec
tric
al c
on
du
ctiv
ity
[S/c
m]
65
% g
rap
hit
e
80
% g
rap
hit
e
80
% g
rap
hit
e
82
% g
rap
hit
e
HD
PE
wit
ho
ut
grap
hit
e
PP
wit
ho
ut
grap
hit
e
PV
DF
wit
ho
ut
grap
hit
e
65
% g
rap
hit
e
80
% g
rap
hit
e
80
% g
rap
hit
e
Fig. 1: Thermal and electrical conductivity of graphite-polymer plates
2h
eat
tran
sfer
co
effi
cien
t [W
/m·K
]
Photo © S. Döring
stat
e as
of:
Au
gust
20
19
Contact
Leibniz-Institut für Polymerforschung Dresden e. V.Department Functional Nanocomposites and BlendsDr. Petra PötschkeE-Mail: [email protected] +49 (0)351 4658 395F +49 (0)351 4658 565
Hohe Straße 6 . 01069 Dresden . Germanywww.ipfdd.de
Dr. Beate KrauseE-Mail: [email protected] +49 (0)351 4658 736
+49 (0)351 4658 565F
Plate heat exchanger - Demonstrator of the company Calorplast Wärmetechnik GmbH (Photo © K. Uhlig)
Schematic construction of the plate heat exchanger (picture © Calorplast Wärmetechnik GmbH)
Heat exchanger plate (Photo © S. Döring)
Cooperation partners
Technical Datamaterials: graphite - (PP/ PVDF / PE) matrixoperation temperatures: -20 to +100°C (depending on polymer)operation pressure: 4 barpressure drop: 100 – 500 mbar
2heat transfer area: 0.03 – 1.5 m
References
Ch. Hopmann et al. Development of a polymer composite with high electrical conductivity and improved impact strength for the application as bipolar plate. AIP Conference Proceedings 1779 (2016) 030017.
B. Krause et al. Electrical and thermal conductivity of polypropylene filled with combinations of carbon fillers. AIP Conference Proceedings 1779 (2016) 040003.
A. Cohnen et al. Flexibilizing Graphite Polar Plates. Kunststoffe international 6 (2016) 63-65.
B. Krause et al. Influence of graphite and SEBS addition on thermal and electrical conductivity and mechanical properties of polypropylene composites. AIP Conference Proceedings 1914 (2017) 030009.
P. Rzeczkowski et al. Characterization of Highly Filled PP/Graphite Composites for Adhesive Joining in Fuel Cell Applications. Polymers 11 (2019) 462.
B. Krause et al. Thermal conductivity and electrical resistivity of melt mixed polypropylene composites containing mixtures of carbon based fillers. Polymers 11 (2019) 1073.
B. Krause et al. Improvement of electrical resistivity of highly filled graphite/PP composite based bipolar plates for fuel cells by addition of carbon black. AIP Conference Proceedings 2139 (2019) 110006.