scholarly journals Design, Fabrication, and Partial Characterization of a Solar Receiver and Air-Cooled Heat Exchanger for a Concentrated Solar Power Supercritical CO2 Testbed

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
Danielle Nobles-Lookingbill ◽  
Aaron Sahm ◽  
Rick Hurt ◽  
Robert Boehm
Keyword(s):  
Heat Exchanger ◽  
Supercritical Co2 ◽  
Experimental System ◽  
Open Loop ◽  
Cycle System ◽  
Low Mass ◽  
Solar Powered ◽  
System Configurations ◽  
Air Cooled Heat Exchanger ◽  
Solar Receiver

Abstract This research details the design, fabrication, and partial testing of a concentrated solar receiver and an air-cooled heat exchanger. The solar receiver and heat exchanger have been fabricated for use in an experimental system that uses the supercritical carbon dioxide Brayton cycle. They are coupled with a Science Applications International Corporation (SAIC) solar dish 250× concentrator located on the University of Nevada, Las Vegas campus. The purpose of this solar-powered supercritical CO2 system is to function as a testbed for testing the cycle, system components, and alternate system configurations. Photographic flux mapping of the dish showed peak solar flux just above 200× and is used to appropriately size the receiver. Sun tests of the tubing, receiver, and air-cooled heat exchanger were performed achieving fluid temperatures in the range of 973 K (700 °C) using nitrogen in an open loop at low mass flowrates, and above 1173-K (900 °C) receiver wall temperatures in a no-flow case.

scholarly journals High-Temperature Receiver Designs for Supercritical CO2 Closed-Loop Brayton Cycles

2014 ◽  
Author(s):  
C. K. Ho ◽  
T. Conboy ◽  
J. Ortega ◽  
S. Afrin ◽  
A. Gray ◽  
...  
Keyword(s):  
High Temperature ◽  
Supercritical Co2 ◽  
Closed Loop ◽  
High Efficiency ◽  
Power Cycles ◽  
Advantages And Disadvantages ◽  
Solar Powered ◽  
Solar Receiver ◽  
Alternative Designs ◽  
Indirect Heating

High-temperature receiver designs for solar powered supercritical CO2 Brayton cycles that can produce ∼1 MW of electricity are being investigated. Advantages of a supercritical CO2 closed-loop Brayton cycle with recuperation include high efficiency (∼50%) and a small footprint relative to equivalent systems employing steam Rankine power cycles. Heating for the supercritical CO2 system occurs in a high-temperature solar receiver that can produce temperatures of at least 700 °C. Depending on whether the CO2 is heated directly or indirectly, the receiver may need to withstand pressures up to 20 MPa (200 bar). This paper reviews several high-temperature receiver designs that have been investigated as part of the SERIIUS program. Designs for direct heating of CO2 include volumetric receivers and tubular receivers, while designs for indirect heating include volumetric air receivers, molten-salt and liquid-metal tubular receivers, and falling particle receivers. Indirect receiver designs also allow storage of thermal energy for dispatchable electricity generation. Advantages and disadvantages of alternative designs are presented. Current results show that the most viable options include tubular receiver designs for direct and indirect heating of CO2 and falling particle receiver designs for indirect heating and storage.

Optimum operation of open-loop ground heat exchanger considering subsurface temperature gradient

2015 ◽  
Vol 40 (5) ◽  
pp. 651-661 ◽  
Author(s):  
Hyun-Jun Choi ◽  
Sangwoo Park ◽  
Hyungi Lee ◽  
Khanh Linh Nguyen Pham ◽  
Hyungkyou Ryu ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Temperature Gradient ◽  
Open Loop ◽  
Ground Heat Exchanger ◽  
Subsurface Temperature ◽  
Optimum Operation

scholarly journals A Novel Solar Receiver for Supercritical CO2 Brayton Cycle

2019 ◽  
Vol 158 ◽  
pp. 339-344 ◽  
Author(s):  
Liang Teng ◽  
Yimin Xuan
Keyword(s):  
Supercritical Co2 ◽  
Brayton Cycle ◽  
Solar Receiver

Air-cooled heat exchanger applied to external rotary kiln wall in forced and natural draft

2017 ◽  
Vol 154 ◽  
pp. 517-525 ◽  
Author(s):  
F. Huchet ◽  
M. Piton ◽  
A. Del Barrio ◽  
O. Le Corre ◽  
B. Cazacliu
Keyword(s):  
Heat Exchanger ◽  
Rotary Kiln ◽  
Natural Draft ◽  
Air Cooled Heat Exchanger

An Experimental Study for NOx - Emission Reduction with Urea-SCR Technology in Vehicular Diesel Engines

2011 ◽  
Vol 71-78 ◽  
pp. 2089-2093 ◽  
Author(s):  
Qian Wang ◽  
Ming Xing Zhou ◽  
Bao Yi Wang
Keyword(s):  
Fuel Consumption ◽  
Control Strategy ◽  
Catalytic Reduction ◽  
Water Solution ◽  
Open Loop ◽  
Loop Control ◽  
Consumption Ratio ◽  
Future Emission ◽  
System Configurations ◽  
Scr System

In order to fulfill future emission standards for middle and heavy-duty vehicles like state Ⅳ and Ⅴ, advanced measures on exhaust gas and engine functionality are required. Selective Catalytic Reduction (SCR) technology is the unique technology currently which can improve the emission and reduce fuel consumption simultaneously. Firstly the reductants and its chemical reactions, SCR system configurations and its working principle and urea dosing control strategy are introduced. Then tests are conducted on a diesel engine with SCR system at bench. The results of ESC cycle show that NOx emission is decreased by more than 67% with the open-loop control strategy. Additionally, the urea and fuel consumption and ammonia leakage have been compared and analyzed respectively, the experiment data indicates that the urea water solution consumption ratio is only 5.7% of fuel for this SCR system, while its average ammonia slip is below 5 ppm.

Optimization Design of Refuse-Incinerating Power Plant With Air-Cooled Heat Exchanger

2013 ◽  
Vol 35 (6-8) ◽  
pp. 711-720
Author(s):  
Dongjie Zhang ◽  
Qin Chen ◽  
Qiuwang Wang ◽  
Xiangyang Xu
Keyword(s):  
Heat Exchanger ◽  
Power Plant ◽  
Optimization Design ◽  
Air Cooled Heat Exchanger

Application of Supercritical Carbon Dioxide for Solar Water Heater

2017 ◽  
pp. 215-234
Author(s):  
Yuhiro Iwamoto ◽  
Hiroshi Yamaguchi
Keyword(s):  
Heat Exchanger ◽  
Solar Collector ◽  
Supercritical Co2 ◽  
Large Change ◽  
Solar Water Heater ◽  
Water Heater ◽  
Solar Water ◽  
Small Change ◽  
And Performance ◽  
Main Components

For supercritical CO2, a small change in temperature or pressure can result in large change in density, especially in the state close to the critical point. The large change in density can easily induce the natural convective flow. In this chapter, a solar water heater using supercritical CO2 which is originally designed and constructed will be introduced. The solar water heater is a closed loop system with main components of an evacuated solar collector and a heat exchanger. The working fluid of CO2 is naturally driven by the large change in density with absorbing and transporting heat in the solar collector. And the heat energy (hot water) is produced by exchanging the transferred heat with water in the heat exchanger. This chapter will describe the typical system operation and performance at different season and climates.

scholarly journals Heat Transfer between Molten Salt and Supercritical CO2 in Discontinuous Fins Print Circuits Heat Exchanger

2019 ◽  
Vol 158 ◽  
pp. 5832-5837 ◽  
Author(s):  
Jiewei Lao ◽  
Jing Ding ◽  
Qianmei Fu ◽  
Weilong Wang ◽  
Jianfeng Lu
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Molten Salt ◽  
Supercritical Co2
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