Experimental Study On The Measurement Of The Total Heat Flow Of Hot Equipment By Two IR Systems

1989 ◽  
Author(s):  
Zhang Wei ◽  
Gao Kuiming ◽  
Zhao Ying
Keyword(s):  
Experimental Study ◽  
Heat Flow ◽  
Total Heat ◽  
Total Heat Flow

Simulation and Diagnostics of the External and Internal Circulation Flows of Solids in a Biomass Fired CFB Boiler

2004 ◽  
Author(s):  
Daniel Ha¨ggsta˚hl ◽  
Catrin Bartusch ◽  
Erik Dahlquist ◽  
Shilie Weng
Keyword(s):  
Heat Flow ◽  
Circulating Fluidized Bed ◽  
Internal Heat ◽  
Circulation Model ◽  
Internal Flow ◽  
Total Heat ◽  
Heat Output ◽  
Circulation Flow ◽  
Total Heat Flow ◽  
Cfb Boiler

Ash related operational problems are very common in biomass fired boilers. Biomass naturally contains both sodium chloride and potassium chloride and theses compounds lower the melting temperature of the ash which may cause large operational problems with agglomeration and defluidization in Circulating Fluidized Bed (CFB) boilers. The number of biomass fired CFB-boilers for combined heat and power (CHP) production in the Scandinavian market is growing due to their good combustion efficiency, fuel flexibility and low emissions. The power companies are asking for a method to calculate the internal and external circulation flows of solids in the boiler and an accurate diagnostic method to detect initial agglomeration in order to be able to prevent the problem of defluidization that leads to large costs and loss of revenue when the boiler has to be shut down for cleaning. Two heat and mass balance based models have been developed in order to calculate the fuel flow and the internal and external solids circulation flows in a CFB boiler with internal heat exchangers (INTREX). The solids circulation model is divided into three parts: cyclone, combustion and INTREX chambers. Measurements used in the calculation are from commissioning tests on CFB-boiler 5 at Ma¨larEnergi in Va¨stera˚s, Sweden. The boiler was manufactured by Foster Wheeler OY in Finland and has a thermal heat output of 157 MW. The external solids flow at 100% load, with and without air humidification, is 215 kg/s and the internal solids circulation is 93 kg/s. The external solids circulation flow at 60% load is 30 kg/s and the internal solids circulation flow is 486 kg/s. At 60% load, there is no data available for validation, which means that this is more an estimate then a calculation. The calculated internal flow of solids is very sensitive to changes in the total heat flow in the INTREX chamber caused by agglomeration or combustion, whereas the external solids flow is not affected. Hence initial agglomeration and combustion can be detected. A simulated agglomeration in the INTREX chambers by decreasing the total heat flow by 1%, led to a decrease in the internal solids circulation flow by 11%. A simulation of combustion in the INTREX chamber of 0.5 kg/s of fuel entering the chamber corresponds to an increase in the total heat flow of 22% and a decrease in the calculated internal mass flow of 16%. The potential for using this method of diagnostics for detecting initial agglomeration is very promising.

EFFICIENCY OF SOLAR PROTECTION OF THE MOBILE AGRICULTURAL MACHINE CAB

2020 ◽  
Author(s):  
V.V. Maslensky ◽  
◽  
Y.I. Bulygin
Keyword(s):  
Heat Flow ◽  
Solar Radiation ◽  
Sun Protection ◽  
Total Heat ◽  
Total Heat Flow ◽  
Agricultural Machine ◽  
Heat Protection ◽  
Low Efficiency ◽  
Working Day

The article checks the effectiveness of translucent enclosing structures of the tractor cab in reducing solar radiation. For this purpose, the value of the total heat flow entering the interior during the entire working day was determined, which was later compared with the hygienic standards. The result demonstrated an average low efficiency of the tractor cab sun protection. In this regard, the use of more effective shading elements and the use of glass with increased light and heat protection properties in light openings is proposed.

Ratio of Radial to Total Heat Flow in Circular Rod

1963 ◽  
Vol 85 (3) ◽  
pp. 285-286 ◽  
Author(s):  
Y. T. Tsui ◽  
F. K. Tsou
Keyword(s):  
Heat Flow ◽  
Total Heat ◽  
Total Heat Flow

scholarly journals EXPERIMENTAL STUDY ON HEAT FLOW IN NATURAL GROUND DURING FROZEN SEASON

2003 ◽  
pp. 135-144
Author(s):  
Zhaoyu YANG ◽  
Teruyuki SUZUKI ◽  
Seigo SAWADA ◽  
Satoshi YAMASHITA
Keyword(s):  
Experimental Study ◽  
Heat Flow

COMPUTATIONAL AND EXPERIMENTAL STUDY OF THE EFFECTIVE THERMAL CONDUCTIVITY OF FIBROUS MATERIALS

2021 ◽  
pp. 95-102
Author(s):  
N.N. Vorobev ◽  
◽  
D.Ya. Barinov ◽  
A.V. Zuev ◽  
S.I. Pakhomkin ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Heat Flow ◽  
Porous Structure ◽  
Effective Thermal Conductivity ◽  
Fibrous Materials ◽  
Zone Method ◽  
Factors Influencing ◽  
Main Factors ◽  
Hot Zone

The article is devoted to the evaluation of the effect of porosity on the effective thermal conductivity of thermal insulation materials. The main factors influencing the thermal conductivity of the material, such as density, the type of porous structure of the material and humidity, are considered. The method of measuring the thermal conductivity by the stationary heat flow method and the hot zone method is described. A method for calculating the effective thermal conductivity of fibrous materials is presented. A computational and experimental study of the effective thermal conductivity is carried out and the results are analyzed.

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