Determination and comparison of heat exchange efficiency of four commercially available blood cardioplegia sets

Perfusion ◽  
1994 ◽  
Vol 9 (5) ◽  
pp. 343-347
Author(s):  
David S Hundley ◽  
Roger A Vertrees ◽  
Louis Brownstein ◽  
Michael Clancy ◽  
Alexander P Garwood ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Water Flow ◽  
Statistical Difference ◽  
Blood Cardioplegia ◽  
Heat Exchange Efficiency ◽  
Exchange Properties ◽  
In Vitro Comparison

An in vitro comparison of the heat exchange properties of the Electromedics D1081A, Sarns MP-4 'Conducer Coil' 165720, Bentley HE-1 00 and the Shiley BCD Plus 4:1 blood cardioplegia sets was performed. The efficiency was calculated for each heat exchanger and post-heat exchange blood path temperatures were compared. The calculated efficiency for each heat exchanger is as follows: Electromedics D1081A at 18 I/minute coil water flow (0.95); Sarns MP-4 165720 at 9 I/minute coil water flow (0.93); Bentley HE-100 at 10 I/minute coil water flow (0.91); Shiley BCD Plus at 15 I/minute coil water flow (0.90). Blood path, precoil temperatures for each unit were compared statistically with no differences found ( p > 0.05). Blood side, postcoil temperatures were then compared. The average postcoil blood path temperature of the Electromedics D1081A was 1.6° ± 0.1 °C, of the Sarns MP-4 165720 it was 2.1 ± 0.1°C, of the Bentley HE-100 it was 2.7° ± 0.3°C, and the Shiley BCD Plus 3.0° ± 0.4°C. The results of this experiment indicate that the average postcoil temperature of the Electromedics D1081 A was lower than the Sarns MP-4 165720 ( p < 0.05) which was lower than that of the Bentley HE-100 ( p < 0.05) and Shiley BCD Plus ( p < 0.05). No statistical difference was found between the average postcoil temperature of the Bentley HE-1 00 and the Shiley BDC Plus.

Design of the Plate Heat Exchanger

2014 ◽  
Vol 912-914 ◽  
pp. 624-627
Author(s):  
Kai Jun Chen
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Service Life ◽  
High Heat ◽  
Plate Heat Exchanger ◽  
Compact Structure ◽  
Industrial Construction ◽  
Plate Heat ◽  
Heat Exchange Equipment ◽  
Heat Exchange Efficiency

The plate heat exchanger is an ideal heat exchange equipment for liquid - liquid, liquid--gas, it has the characteristics of high heat exchange efficiency, low heat loss, compact structure, small occupation area, convenient installation and cleaning, wide application, long service life etc.. So the design of plate heat exchanger in the relevant state industrial construction is a very important link,

scholarly journals Analyzing How the ZrO2Far Infrared Material Affects the Performance of Smooth Tube Heat Exchangers

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
T. Y. Chen ◽  
H. P. Cho ◽  
C. S. Jwo ◽  
M. H. Hung ◽  
W. S. Lee
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Exchangers ◽  
Far Infrared ◽  
Smooth Tube ◽  
Ambient Conditions ◽  
Acrylic Paint ◽  
Mixing Method ◽  
Heat Exchange Efficiency

The aim of this study was to investigate the effect of the 100 nm ZrO2far infrared material on the heat exchange efficiency of smooth tube heat exchangers. In the experiments designed for this purpose, the ZrO2powder and water based acrylic paint were mixed separately using a two-step mixing method and the mixture samples were sprayed, respectively, onto heat exchangers for testing their heat exchange efficiency under stable ambient conditions. Results from the experiments showed 31.8% and 21.5% increases in heat transfer in the heat exchanger sprayed with 7.5 wt.% ZrO2powder and with inlet water temperatures at 45°C and 55°C relative to the heat exchanger sprayed with 0 wt.% acrylic paint and 26.4% and 18.9% increases in heat transfer relative to the heat exchanger not sprayed with acrylic paint. The experiments also verified that heat could be transferred through radiation. The additive ZrO2nanopowder in these experiments is proven to be able to improve the efficiency of heat exchangers through radiation, thereby increasing the feasibility of its application in practice.

COMPUTER SIMULATION OF FLOW IN CORRUGATED CHANNEL OF PLATE HEAT EXCHANGER

2020 ◽  
pp. 51-58
Author(s):  
Л. А. Кущев ◽  
В. Н. Мелькумов ◽  
Н. Ю. Саввин
Keyword(s):  
Computer Simulation ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
High Speed ◽  
Exchange Process ◽  
Plate Heat Exchanger ◽  
System Stability ◽  
Plate Heat ◽  
Corrugated Channel ◽  
Heat Exchange Process

Постановка задачи. Рассматривается теплообменный процесс, протекающий в модифицированном гофрированном межпластинном канале интенсифицированного пластинчатого теплообменного аппарата с повышенной турбулизацией теплоносителя. Необходимо разработать компьютерную модель движения теплоносителя в диапазоне скоростей 0,1-1,5 м/с и определить коэффициент турбулизации пластинчатого теплообменника. Результаты. Приведены результаты компьютерного моделирования движения теплоносителя в межпластинном гофрированном канале оригинального пластинчатого теплообменного аппарата с помощью программного комплекса Аnsys . Определены критерии устойчивости системы. Выполнено 3 D -моделирование канала, образуемого гофрированными пластинами. При исследовании процесса турбулизации были рассмотрены несколько скоростных режимов движения теплоносителя. Определен коэффициент турбулизации Tu, %. Выводы. В результате компьютерного моделирования установлено увеличение коэффициента теплопередачи К, Вт/(м ℃ ) за счет повышенной турбулизации потока, что приводит к снижению металлоемкости и уменьшению стоимости теплообменного оборудования. Statement of the problem. The heat exchange process occurring in a modified corrugated interplate channel of an intensified plate heat exchanger with an increased turbulence of the heat carrier is discussed. A computer model of the coolant movement in the speed range of 0.1-1.5 m/s is developed and the turbulence coefficient of the plate heat exchanger is determined. Results. The article presents the results of computer modeling of the coolant movement in the interplate corrugated channel of the original plate heat exchanger using the Ansys software package. The criteria of system stability are defined. 3D modeling of the channel formed by corrugated plates is performed. In the study of the process of turbulence several high-speed modes of movement of the coolant were considered. The turbulence coefficient Tu, % is determined. Conclusions. As a result of computer simulation, an increase in the heat transfer coefficient K, W/(m ℃) was found due to an increased turbulization of the flow, which leads to a decrease in metal consumption and a decrease in the cost of heat exchange equipment.

scholarly journals An in vitro comparison of tibial tray cementation using gun pressurization or pulsed lavage

2014 ◽  
Vol 38 (5) ◽  
pp. 967-971 ◽  
Author(s):  
Ulf J. Schlegel ◽  
Klaus Püschel ◽  
Michael M. Morlock ◽  
Katrin Nagel
Keyword(s):  
Tibial Tray ◽  
Pulsed Lavage ◽  
In Vitro Comparison

scholarly journals Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1893
Author(s):  
Kwonye Kim ◽  
Jaemin Kim ◽  
Yujin Nam ◽  
Euyjoon Lee ◽  
Eunchul Kang ◽  
...  
Keyword(s):  
Exchange Rate ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Pump ◽  
Heat Extraction ◽  
Ground Heat Exchanger ◽  
Pump System ◽  
Heat Pump System ◽  
Scale Experiment ◽  
Real Scale

A ground source heat pump system is a high-performance technology used for maintaining a stable underground temperature all year-round. However, the high costs for installation, such as for boring and drilling, is a drawback that prevents the system to be rapidly introduced into the market. This study proposes a modular ground heat exchanger (GHX) that can compensate for the disadvantages (such as high-boring/drilling costs) of the conventional vertical GHX. Through a real-scale experiment, a modular GHX was manufactured and buried at a depth of 4 m below ground level; the heat exchange rate and the change in underground temperatures during the GHX operation were tracked and calculated. The average heat exchanges rate was 78.98 W/m and 88.83 W/m during heating and cooling periods, respectively; the underground temperature decreased by 1.2 °C during heat extraction and increased by 4.4 °C during heat emission, with the heat pump (HP) working. The study showed that the modular GHX is a cost-effective alternative to the vertical GHX; further research is needed for application to actual small buildings.

In vitro comparison of harvesting site effects on cardiac extracellular matrix hydrogels

2021 ◽  
Author(s):  
Emily Mulvany ◽  
Sara McMahan ◽  
Jiazhu Xu ◽  
Narges Yazdani ◽  
Rebecca Willits ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Site Effects ◽  
In Vitro Comparison
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