Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT...
Transcript of Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT...
![Page 1: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/1.jpg)
Thermal and Flow Simulation of a High Temperature Printed Circuit Heat Exchanger
Qingzi Zhu, Xu Tan, Bamdad Barari, Caleb Amy, Colin Clancy Kelsall, Asegun Henry
MITPresented at: COMSOL Conference 2019 1
![Page 2: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/2.jpg)
BACKGROUND
Higher operation temperature, higher efficiency and lower LCOE for CSP plant DOE targets >750 ͦ C for the next
generation CSPCompact PCHEs capable working
above 550 ͦ C are not commercially availableNeed to design and build a low cost
high temperature high pressure PCHE
2
PUMP
VALVE
![Page 3: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/3.jpg)
HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER
Working fluid: molten salt and sCO2Working temperature: 750 ͦ C Working pressure:
sCO2: 20 MPaMolten salt: 0.1 MPa
HEX material: ZrC/WHigh strength, high corrosion and creep
resistant, low cost
3
![Page 4: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/4.jpg)
SINGLE CHANNEL SIMULATION
Representative simulation unit: one molten salt channel one sCO2 channel plate surrounding the two
channelsBC settings: Periodic boundary conditions on
top/bottom and side surfaces Inlet velocity and out let pressure Inlet temperature
Mesh number: ~100K
4
![Page 5: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/5.jpg)
SINGLE CHANNEL SIMULATION
Information obtained: Temperature power density Velocity Pressure pressure drop
Information missed: Flow pattern effects Less HT-effective region Flow mal-distribution in inlet and
outlet header
5
![Page 6: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/6.jpg)
SINGLE PLATE SIMULATION
A HEX plate simulation provides more realistic results.Serpentine channel for sCO2 and
straight channel for molten salt.Flow pattern effects are accounted
for.Periodic BC on top/bottom surfacesMesh number: ~500K
6
![Page 7: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/7.jpg)
SINGLE PLATE SIMULATION
7
New information obtained: Channel pattern effects on the
HEX performance
Information missed: Less HT-effective region Flow mal-distribution in inlet and
outlet header
Temperature, ͦ C
![Page 8: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/8.jpg)
FULL HEX GEOMETRY SIMULATION
8
Simulate the full HEX geometryInclude all the dead zones and
header regionMesh is challengingThe mesh should be fine enough to
capture the change of physics and course enough to keep the computational cost affordable.
![Page 9: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/9.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Tetrahedral mesh in the CO2 elbows
9
![Page 10: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/10.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Swept mesh in the straight section of CO2 channels
10
![Page 11: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/11.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Swept mesh in the straight section of CO2 inlets and outlets
11
![Page 12: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/12.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Face triangular mesh for the salt inlet surfaces.Swept hexahedral mesh for salt domain.
12
![Page 13: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/13.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Boundary layer mesh for the fluid domain
13
![Page 14: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/14.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Tetrahedral mesh in the headers
14
![Page 15: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/15.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Swept mesh in header tubes
15
![Page 16: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/16.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Boundary layer mesh in headers
16
![Page 17: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/17.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Edge mesh in the dead zone edgesSurface triangular in the dead zone surfacesSwept mesh in the dead zones
17
![Page 18: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/18.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Convert rectangular mesh to triangular mesh
18
![Page 19: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/19.jpg)
MESHING SEQUENCE FOR FULL HEX SIMULATION
Tetrahedral mesh for the rest domain
19
![Page 20: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/20.jpg)
FULL HEX DOMAIN SIMULATION RESULTS
20
Temperature Distribution in the PCHE, C
![Page 21: Thermal and Flow Simulation of a High Temperature Printed ... · HIGH TEMPERATURE PRINTED CIRCUIT HEAT EXCHANGER Working fluid: molten salt and sCO2 Working temperature: 750 ͦC Working](https://reader034.fdocuments.us/reader034/viewer/2022042401/5f1011e77e708231d4474be4/html5/thumbnails/21.jpg)
THANK YOU
Questions
21