scholarly journals A metal additively manufactured (MAM) heat exchanger for electric motor thermal control on a high-altitude solar aircraft – Experimental characterisation

2020 ◽  
Vol 19 ◽  
pp. 100629 ◽  
Author(s):  
Rafal Wrobel ◽  
Ben Scholes ◽  
Ahmed Hussein ◽  
Richard Law ◽  
Ahmad Mustaffar ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
High Altitude ◽  
Electric Motor ◽  
Thermal Control ◽  
Experimental Characterisation

scholarly journals Flow and heat transfer performance of plate phase change energy storage heat exchanger

2019 ◽  
Vol 23 (3 Part B) ◽  
pp. 1989-2000
Author(s):  
Ji-Min Zhang ◽  
Shi-Ting Ruan ◽  
Jian-Guang Cao ◽  
Tao Xu
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Heat Exchanger ◽  
Phase Change ◽  
Thermal Control ◽  
Heat Transfer Characteristics ◽  
Liquid Distribution ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Short Time

In the present work, the phase change energy storage heat exchanger in thermal control system of short-time and periodic working satellite payloads is taken as the research object. Under the condition of constant heated power of the satellite payload, the heat transfer characteristics of phase change energy storage heat exchanger are analyzed by numerical simulation and experimental method. The heat exchanger with fin arrays to enhance heat transfer is filled with tetradecane, whose density varies with temperature. The flow field distribution, the solid-liquid distribution, the temperature distribution, and the phase change process in the plate phase change energy storage heat exchanger unit are analyzed. The flow and heat transfer characteristics of heat exchangers under different fluid-flow rates and temperature were investigated.

Reflex and local thermal control of rabbit ear blood flow

1984 ◽  
Vol 246 (6) ◽  
pp. R979-R984 ◽  
Author(s):  
M. F. Roberts ◽  
A. C. Zygmunt
Keyword(s):  
Blood Flow ◽  
Heat Exchanger ◽  
Thermal Conductance ◽  
Thermal Control ◽  
Hot Water ◽  
Mean Skin Temperature ◽  
Blood Temperature ◽  
Rabbit Ear ◽  
New Zealand White Rabbits ◽  
The Common

We measured thermal conductance (K) of the ears of 12 New Zealand White rabbits during periods of core heating in which mean skin temperature and ear temperatures (Te) were controlled. Right Te was always held at 28 degrees C; left Te was 15, 20, 24, 28, 31, 33 degrees C in separate core heating periods. Core heating was obtained by perfusing a previously implanted intravascular heat exchanger with hot water. Blood temperature (Tbl) was measured with a thermocouple that had been previously placed in contact with the common carotid artery. During heating, K rose with rising Tbl, but the relation between K and Tbl depended on Te. At high Te, K rose rapidly in the initial stages of core heating and soon reached its maximal value. At cool Te, K rose slowly with rising Tbl until high Tbl was reached; then K rose rapidly to maximal values. The maximal value of K reached at high Tbl was independent of Te. The results suggest that local temperature affects ear blood flow by affecting the way that ear blood vessels react to sympathetic reflex signals.

scholarly journals A Review on Design and optimization of shell and tube heat exchanger by varying parameters

2020 ◽  
Vol 6 (6) ◽  
Author(s):  
Shiv Kumar ◽  
Dharamveer Singh
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Fluid Dynamic ◽  
Exchange Process ◽  
Cost Savings ◽  
Thermal Control ◽  
Tube Heat Exchanger ◽  
Design And Optimization ◽  
Compact Heat Exchangers ◽  
Computation Fluid Dynamic

In recent years, thermal control systems performance has improved in numerous ways due to developments in control theory and information technology. Efforts have been made to produce more efficient heat exchangers by employing various methods of heat transfer enhancement.  An increase in heat exchanger performance can lead to a more economical design of heat exchanger which can help to make energy, material & cost savings related to a heat exchange process. Compact heat exchangers (CHEs) technologies are expected to be one of the solutions for the new generation heat exchanger.  In this paper are presented of the compact heat exchanger, Plate-fin heat exchanger, and Printed Circuit Heat Exchanger. And computation fluid dynamic is used which offers an alternative to the quick and inexpensive solution for the design and optimization of compact heat exchangers.

Experimental Comparison of Thermal Control Strategies in Piping Networks

2003 ◽  
Author(s):  
Walfre Franco ◽  
Mihir Sen ◽  
K. T. Yang ◽  
Rodney L. McClain
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Thermal Load ◽  
Control Strategies ◽  
Cooling Water ◽  
Thermal Control ◽  
Control Technique ◽  
Experimental Comparison ◽  
Primary Loop ◽  
Heating And Cooling

This manuscript presents an experimental study of three thermal control strategies commonly used in heating and cooling of buildings. The strategies are defined by the variables to be controlled, the hardware used for control and the piping arrangement. The experimental facility includes three heat exchangers within secondary loops that are connected to a primary loop. A different control technique is applied to each secondary loop. A heat exchanger on the primary loop delivers cooling water to the secondaries and receives warm water in return. Chilled water is provided by the building services. The thermal load to the heat exchangers is supplied by two water heaters which are located on a closed heating circuit. PID controllers are used to respond to changes in the thermal load. The temperature difference at the primary loop heat exchanger is used as a criterion for comparison to assess the relative merits and drawbacks of each strategy.

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