Design of Temperature Testing System in Multi-Parameter Combined Environmental Test

2012 ◽  
Vol 157-158 ◽  
pp. 127-131 ◽  
Author(s):  
Guan Hua Xu ◽  
Wen He ◽  
Run Jie Shen
Keyword(s):  
Temperature Field ◽  
Waste Heat ◽  
Cooling System ◽  
Test Chamber ◽  
Flow Diagram ◽  
Temperature Control System ◽  
Thermoelectric Coolers ◽  
Pid Algorithm ◽  
Circulating Water ◽  
Environmental Test

A novel design of a temperature test chamber in multi-parameter combined environmental test was introduced, in which thermoelectric coolers were adopted to achieve both high and low temperature. Multiple distributed actuators and temperature sensors were used for improving the evenness of the temperature field. A well performed cooling system for waste heat dissipating was designed based on air-cooled radiator and circulating water flow. A temperature control system based on PC and MCU with wireless communication modules was designed. The thermoelectric cooler was driving by H-bridge circuit, whose power was controlled by PWM signal. PID algorithm was applied and average temperature was adopted to be the controlled variable. Measurement and control software on the PC and MCU was analyzed and its flow diagram was given. Influenced by centrifugal acceleration, unevenness of the temperature field would increase. A fan was mounted at the bottom of the chamber to improve the evenness of the temperature field. The experiment results show that the temperature environment with other combined environment is realized in the test chamber based on the above technology.

The Oriented Spray Cooling System for Supplementing Cooling Lakes

2017 ◽  
Author(s):  
Charles F. Bowman
Keyword(s):  
Power Plants ◽  
Waste Heat ◽  
Cooling System ◽  
Air Flow ◽  
Ambient Air ◽  
Spray Cooling ◽  
Cooling Capacity ◽  
Ambient Temperatures ◽  
Circulating Water ◽  
Auxiliary Power

With ever-increasing ambient temperatures many electric power plants that employ cooling lakes to reject their waste heat into the environment are struggling to maintain reasonable turbine backpressures during the hot summer months when electric load demand is often the greatest. Some consider adding mechanical draft cooling towers (MDCT) to further cool the condenser circulating water (CCW) prior to entering the main condenser, but the additional auxiliary power required to drive MDCT fans often consume the additional generator output resulting from the lower backpressure. Spray ponds offer significant advantages over MDCT including superior simplicity and operability, lower power requirements, and lower capital and maintenance costs. The Oriented Spray Cooling System (OSCS) is an evolutionary spray pond design. Unlike a conventional spray pond in which spray nozzles are arranged in a flat bed and spray upward, blocking the ambient air flow to the spray region as it travels down to the pond below, the OSCS nozzles are mounted on spray trees arranged in a circle and are tilted at an angle oriented towards the center of the circle. As a result, the water droplets drag air into the spray region while the warm air concentrated in the center of the circle rises. Both of these effects work together to increase air flow through the spray region. Increased air flow reduces the local wet-bulb temperature (LWBT) of the air in the spray pattern, promoting heat transfer and more efficient cooling. During the late 1970’s the author developed a purely analytical model to predict the thermal performance of the OSCS which was successfully compared with the OSCS at the Columbia Generating Station (CGS) in the mid 1980’s. This paper describes how the OSCS may be employed to supplement the cooling capacity of an existing cooling lake to reduce the temperature of the CCW prior to entering a power plant, resulting in lower main condenser pressures and more net plant output.

Design of Cooling System for Infrared CCD Camera Used to Monitor Burden Surface of Blast Furnace Based on Thermoelectric Coolers

2013 ◽  
Vol 419 ◽  
pp. 778-783
Author(s):  
Li Qiang Wang ◽  
Li Zhou ◽  
Hai Tao Fan
Keyword(s):  
Blast Furnace ◽  
Temperature Sensor ◽  
Cooling System ◽  
Ccd Camera ◽  
Temperature Control System ◽  
Duty Ratio ◽  
Thermoelectric Cooler ◽  
Cold Surface ◽  
Thermoelectric Coolers ◽  
Working Temperature

A temperature control system based on thermoelectric coolers is designed in this paper for infrared CCD camera used to monitor burden surface of blast-furnace. The thermoelectric cooling system consists of a microcontroller module, a temperature sensor, a CCD camera, a thermoelectric cooler, a power amplifier and isolation module. The CCD camera with a temperature sensor is tightly mounted on the TEC cold surface. The microcontroller changes duty ratio of PWM signals with changes of the camera temperature to make working temperature of the CCD camera constant. The experiments show that the cooling system works well in temperature controlling

scholarly journals 3D-printed gelatin methacrylate (GelMA)/silanated silica scaffold assisted by two-stage cooling system for hard tissue regeneration

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Eunjeong Choi ◽  
Dongyun Kim ◽  
Donggu Kang ◽  
Gi Hoon Yang ◽  
Bongsu Jung ◽  
...  
Keyword(s):  
Osteogenic Differentiation ◽  
Tissue Regeneration ◽  
Cooling System ◽  
Composite Scaffold ◽  
Human Mesenchymal Stem Cells ◽  
Temperature Control System ◽  
Process Conditions ◽  
Hard Tissue ◽  
Two Stage ◽  
3D Printed

Abstract Among many biomaterials, gelatin methacrylate (GelMA), a photocurable protein, has been widely used in 3D bioprinting process owing to its excellent cellular responses, biocompatibility and biodegradability. However, GelMA still shows a low processability due to the severe temperature dependence of viscosity. To overcome this obstacle, we propose a two-stage temperature control system to effectively control the viscosity of GelMA. To optimize the process conditions, we evaluated the temperature of the cooling system (jacket and stage). Using the established system, three GelMA scaffolds were fabricated in which different concentrations (0, 3 and 10 wt%) of silanated silica particles were embedded. To evaluate the performances of the prepared scaffolds suitable for hard tissue regeneration, we analyzed the physical (viscoelasticity, surface roughness, compressive modulus and wettability) and biological (human mesenchymal stem cells growth, western blotting and osteogenic differentiation) properties. Consequently, the composite scaffold with greater silica contents (10 wt%) showed enhanced physical and biological performances including mechanical strength, cell initial attachment, cell proliferation and osteogenic differentiation compared with those of the controls. Our results indicate that the GelMA/silanated silica composite scaffold can be potentially used for hard tissue regeneration.

Qassim Central Power Plant Inlet Air Cooling System

2001 ◽  
Author(s):  
A. Al Bassam ◽  
Y. M. Al Said
Keyword(s):  
Saudi Arabia ◽  
Power Plant ◽  
Cooling System ◽  
Flow Diagram ◽  
Air Cooling ◽  
Process Flow Diagram ◽  
Electric Company ◽  
Start Up ◽  
Air Cooling System ◽  
And Performance

This paper summarizes the experiences with the first gas turbine inlet air cooling project in Saudi Arabia. It will cover the feasibility study, cooling system options, overview, system equipment description, process flow diagram, construction, commissioning, start-up and performance of the project which is currently under commissioning and initial start up at Qassim Central Power Plant (QCPP) owned by Saudi Electric Company (S.E.C.) Central Region Branch.

Environmental test chamber elucidation of ozone-initiated secondary pollutant emissions from painted wooden panels in buildings

2012 ◽  
Vol 50 ◽  
pp. 135-140 ◽  
Author(s):  
Yung-Tai Huang ◽  
Cheng-Chen Chen ◽  
Yaw-Kuang Chen ◽  
Che-Ming Chiang ◽  
Chia-Yen Lee
Keyword(s):  
Test Chamber ◽  
Pollutant Emissions ◽  
Environmental Test

ANALYSIS OF METHODS FOR CALCULATING HEAT TRANSFER IN THERMOELECTRIC COOLING SYSTEMS FOR HEAT-STRESSED ELEMENTS

2021 ◽  
pp. 21-31
Author(s):  
С.В. Бородкин ◽  
А.В. Иванов ◽  
И.Л. Батаронов ◽  
А.В. Кретинин
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Cooling System ◽  
Average Heat Transfer Coefficient ◽  
The Finite Element Method ◽  
Differential Heat ◽  
Average Heat ◽  
Principal Possibility

На основе уравнений теплопереноса в движущейся среде и соотношений теплопередачи в термоэлектрическом охладителе приведен сравнительный анализ методик расчета поля температуры в теплонапряженном элементе. Рассмотрены методики на основе: 1) теплового баланса, 2) среднего коэффициента теплоотдачи, 3) дифференциального коэффициента теплоотдачи, 4) прямого расчета в рамках метода конечных элементов. Установлено, что первые две методики не дают адекватного распределения поля температур, но могут быть полезны для определения принципиальной возможности заданного охлаждения с использованием термоэлектрических элементов. Последние две методики позволяют корректно рассчитать температурное поле, но для использования третьей методики необходим дифференциальный коэффициент теплоотдачи, который может быть найден из расчета по четвертой методике. Сделан вывод о необходимости комбинированного использования методик в общем случае. Методы теплового баланса и среднего коэффициента теплоотдачи позволяют определить принципиальную возможность использования термоэлектрического охлаждения конкретного теплонапряженного элемента (ТЭ). Реальные параметры системы охлаждения должны определяться в рамках комбинации методов дифференциального коэффициента теплоотдачи и конечных элементов (МКЭ). Первый из них позволяет определить теплонапряженные области и рассчитать параметры системы охлаждения, которые обеспечивают тепловую разгрузку этих областей. Второй метод используется для проведения численных экспериментов по определению коэффициента теплоотдачи реальной конструкции The article presents on the basis of the equations of heat transfer in a moving medium and the relations of heat transfer in a thermoelectric cooler, a comparative analysis of methods for calculating the temperature field in a heat-stressed element. We considered methods based on: 1) heat balance, 2) average heat transfer coefficient, 3) differential heat transfer coefficient, 4) direct calculation using the finite element method. We established that the first two methods do not provide an adequate distribution of the temperature field but can be useful for determining the principal possibility of a given cooling using thermoelectric elements. The last two methods allow us to correctly calculate the temperature field; but to use the third method, we need a differential heat transfer coefficient, which can be found from the calculation using the fourth method. We made a conclusion about the need for combined use of methods in a general case. The methods of thermal balance and average heat transfer coefficient allow us to determine the principal possibility of using thermoelectric cooling of a specific heat-stressed element. The actual parameters of the cooling system should be determined using a combination of the differential heat transfer coefficient and the finite element method. The first of them allows us to determine the heat-stressed areas and calculate the parameters of the cooling system that provide thermal discharge of these areas. The second method is used to perform numerical experiments to determine the heat transfer coefficient of a real structure

scholarly journals EFFECTIVE USE OF ROTARY FURNACE SHELL HEAT

2014 ◽  
Vol 54 (6) ◽  
pp. 414-419
Author(s):  
Julius Lisuch ◽  
Dusan Dorcak ◽  
Jan Spisak
Keyword(s):  
Waste Heat ◽  
Cooling System ◽  
Raw Materials ◽  
Significant Proportion ◽  
Rotary Furnace ◽  
Cost Effective ◽  
Total Energy Expenditure ◽  
Heat Losses ◽  
Controlled Cooling ◽  
Effective Use

<pre><pre>Significant proportion of the total energy expenditure for the heat treatment of raw materials are heat losses through the shell of rotary furnace. Currently, the waste heat is not used in any way and escapes into the environment. Controlled cooling system for rotary furnace shell (<span>CCSRF</span>) is a new solution integrated into the technological process aimed at reducing the heat loss of the furnace shell. Based on simulations and experiments carried out was demonstrated a significant effect of controlled cooling shell to the rotary furnace work. The proposed solution is cost-effective and operationally undemanding.</pre></pre>

Determination of the Emission of Volatile Organic Compounds from Leather Seats in Environmental Test Chamber

2018 ◽  
Vol 768 ◽  
pp. 31-35
Author(s):  
Jin Wang ◽  
Zhen Zhu Ma ◽  
Lu Chen ◽  
Hong Juan Sun ◽  
Wu Kun Fan
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Test Chamber ◽  
Paper Analysis ◽  
National Standard ◽  
Test Results ◽  
Total Volatile Organic Compound ◽  
Volatile Organic ◽  
Environmental Test

With reference to the international standard ISO16000-9 and the national standard GB/T 31106-14, this paper has chosen leather seats as the research object in order to study the emission of volatile organic compounds (VOCs) and total volatile organic compound (TVOC). The test results show that about 21 species of VOCs released from the leather seats were measured, including several types of aldehydes, ketones, aromatic hydrocarbon ,hydrocarbon, lipids and so on.This paper analysis the possible sources of volatile organic compounds in leather seats as well.

Performance investigation of engine waste heat powered absorption cycle cooling system for shipboard applications

2015 ◽  
Vol 90 ◽  
pp. 820-830 ◽  
Author(s):  
Tao Cao ◽  
Hoseong Lee ◽  
Yunho Hwang ◽  
Reinhard Radermacher ◽  
Ho-Hwan Chun
Keyword(s):  
Waste Heat ◽  
Cooling System ◽  
Absorption Cycle
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