scholarly journals Design of air-cooled waste heat removal system with string type direct contact heat exchanger and investigation of oil film instability

2020 ◽  
Vol 52 (4) ◽  
pp. 734-741 ◽  
Author(s):  
Jangsik Moon ◽  
Yong Hoon Jeong ◽  
Yacine Addad
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Waste Heat ◽  
Heat Removal ◽  
Contact Heat ◽  
String Type ◽  
Film Instability ◽  
Direct Contact Heat Exchanger ◽  
Heat Removal System ◽  
Removal System

New metrics for measuring multiphase mixing effects in a direct-contact heat exchanger

2019 ◽  
Vol 147 ◽  
pp. 592-601 ◽  
Author(s):  
Jianxin Xu ◽  
Qingtai Xiao ◽  
Zhihan Lv ◽  
Junwei Huang ◽  
Ruoxiu Xiao ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Contact Heat ◽  
Mixing Effects ◽  
Direct Contact Heat Exchanger

scholarly journals Analytical Modelling of a Spray Column Three-Phase Direct Contact Heat Exchanger

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Hameed B. Mahood ◽  
Adel O. Sharif ◽  
Seyed Ali Hosseini ◽  
Rex B. Thorpe
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Direct Contact ◽  
Relative Velocity ◽  
Contact Heat ◽  
Spray Column ◽  
Three Phase ◽  
Direct Contact Heat Exchanger

An analytical model for the temperature distribution of a spray column, three-phase direct contact heat exchanger is developed. So far there were only numerical models available for this process; however to understand the dynamic behaviour of these systems, characteristic models are required. In this work, using cell model configuration and irrotational potential flow approximation characteristic models has been developed for the relative velocity and the drag coefficient of the evaporation swarm of drops in an immiscible liquid, using a convective heat transfer coefficient of those drops included the drop interaction effect, which derived by authors already. Moreover, one-dimensional energy equation was formulated involving the direct contact heat transfer coefficient, the holdup ratio, the drop radius, the relative velocity, and the physical phases properties. In addition, time-dependent drops sizes were taken into account as a function of vaporization ratio inside the drops, while a constant holdup ratio along the column was assumed. Furthermore, the model correlated well against experimental data.

Cold energy release characteristics of an ice/air direct contact heat exchanger

2001 ◽  
Vol 30 (2) ◽  
pp. 95-113
Author(s):  
Akiyoshi Ohira ◽  
Michio Yanadori ◽  
Kunihiko Iwabuchi ◽  
Toshikatsu Kimura ◽  
Yuji Tsubota
Keyword(s):  
Heat Exchanger ◽  
Energy Release ◽  
Direct Contact ◽  
Contact Heat ◽  
Cold Energy ◽  
Direct Contact Heat Exchanger

Setup of the Supercritical CO2 Test Facility “SCARLETT” for Basic Experimental Investigations of a Compact Heat Exchanger for an Innovative Decay Heat Removal System

2018 ◽  
Vol 4 (3) ◽  
Author(s):  
Wolfgang Flaig ◽  
Rainer Mertz ◽  
Joerg Starflinger
Keyword(s):  
Heat Exchanger ◽  
Supercritical Co2 ◽  
Nuclear Power ◽  
Power Plants ◽  
Heat Removal ◽  
Test Facility ◽  
Experimental Investigations ◽  
Decay Heat ◽  
Heat Removal System ◽  
Removal System

Supercritical fluids show great potential as future coolants for nuclear reactors, thermal power, and solar power plants. Compared to the subcritical condition, supercritical fluids show advantages in heat transfer due to thermodynamic properties near the critical point. A specific field of interest is an innovative decay heat removal system for nuclear power plants, which is based on a turbine-compressor system with supercritical CO2 as the working fluid. In case of a severe accident, this system converts the decay heat into excess electricity and low-temperature waste heat, which can be emitted to the ambient air. To guarantee the retrofitting of this decay heat removal system into existing nuclear power plants, the heat exchanger (HE) needs to be as compact and efficient as possible. Therefore, a diffusion-bonded plate heat exchanger (DBHE) with mini channels was developed and manufactured. This DBHE was tested to gain data of the transferable heat power and the pressure loss. A multipurpose facility has been built at Institut für Kernenergetik und Energiesysteme (IKE) for various experimental investigations on supercritical CO2, which is in operation now. It consists of a closed loop where the CO2 is compressed to supercritical state and delivered to a test section in which the experiments are run. The test facility is designed to carry out experimental investigations with CO2 mass flows up to 0.111 kg/s, pressures up to 12 MPa, and temperatures up to 150 °C. This paper describes the development and setup of the facility as well as the first experimental investigation.

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