VAV System Operating in an Educational Building Under Tropical Conditions: Modeling and Simulation

2013 ◽  
Author(s):  
Oscar Alvarez ◽  
Marco Sanjuan ◽  
Fabian Amaya ◽  
Antonio Bula
Keyword(s):  
Experimental Data ◽  
Energy Consumption ◽  
Modeling And Simulation ◽  
Transient Process ◽  
Maximum Error ◽  
Tropical Conditions ◽  
Caribbean Area ◽  
The Caribbean ◽  
System Operating ◽  
Good Agreement

An educational building located in the Caribbean area of Colombia that uses a VAV system has been modeled and simulated in order to quantify the energy consumption. The energy values attained has been compared with the real energy consumption obtained from the data system. The results show that the error introduced are sensitive to the building mass at the beginning of the transient process, never the less, as the transient continues, the software shows good agreement with the experimental data. The maximum error at the beginning is 25% and decreases to 10%.

VAV System Operating in an Educational Building Under Tropical Conditions: Energy Analysis

2013 ◽  
Author(s):  
Oscar Alvarez ◽  
Marco Sanjuan ◽  
Fabian Amaya ◽  
Antonio Bula
Keyword(s):  
Cooling Tower ◽  
Flow System ◽  
Ventilation System ◽  
Air Conditioning System ◽  
Variable Air Volume ◽  
Air Volume ◽  
Tropical Conditions ◽  
Caribbean Area ◽  
The Caribbean ◽  
System Operating

An educational building located in the Caribbean area of Colombia that uses a VAV system has been monitored in order to quantify the energy consumption. The energy values attained has been compared with a simulation of the building running with a constant volumetric flow system. The results show that a 43% and 18% energy reduction can be achieved for the ventilation system and for the entire air conditioning system that includes a chiller with variable primary pump, a variable air volume system and a variable cooling tower fan.

Research on Dropwise Condensation for Binary Mixed Vapor

2012 ◽  
Vol 190-191 ◽  
pp. 1355-1360
Author(s):  
Shen Hua Hu ◽  
Xiang Rong Ma ◽  
Fan Wu
Keyword(s):  
Experimental Data ◽  
Size Distribution ◽  
Mass Concentration ◽  
Drop Size ◽  
Pure Water ◽  
Maximum Error ◽  
Vertical Surface ◽  
Experimental Result ◽  
Vapor Velocity ◽  
Good Agreement

An experiment for Marangoni condensation of ethanol-water mixtures was carried out and the departing radius and drop size distribution on vertical surface was presented. An amended formula was obtained after considering the effect of ethanol mass concentration, vapor velocity and condensing temperature difference based on Le Fevre’s formula concerning departing radius of pure water, The calculations were in good agreement with experimental result, had a maximum error less than 23%. Owing to the significant effect on drop size contribution, vapor velocity was introduced into Rose’s formula, and the correctional result compared well with the experimental data.

The Modeling and Simulation of Pneumatic ABS Pressure Regulator Based on AMESim

2014 ◽  
Vol 971-973 ◽  
pp. 811-815 ◽  
Author(s):  
Tian Fei Ma ◽  
Qian Chen
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Modeling And Simulation ◽  
Simulation Model ◽  
Dynamic Characteristics ◽  
Commercial Vehicle ◽  
Static Characteristics ◽  
Pressure Regulator ◽  
Characteristic Curves ◽  
Good Agreement

The pneumatic ABS pressure regulator of commercial vehicle is submitted to study in this paper. Its structure and operating principle are introduced, and a simulation model based on the AMESim is established on the basis of its mathematical model. Then the static characteristics and dynamic characteristics are researched by simulation model and the characteristic curves are compared with experimental data for the verification. The results show that simulation curves and experiment curves are in good agreement, which can be tolerated in the engineering.

Analysis on a Counter-Current Flow Hemodialyzer

2009 ◽  
Vol 4 (5) ◽  
Author(s):  
Norman W Loney
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Closed Form Solution ◽  
Maximum Error ◽  
Form Solution ◽  
Transfer Coefficients ◽  
Confluent Hypergeometric Functions ◽  
Proposed Model ◽  
Counter Current ◽  
Good Agreement

The closed form solution to the conjugated boundary value problem posed by a counter current hemodialyzer facilitates the estimation of the overall mass transfer coefficient. Comparison of the proposed model results with published experimental data shows good agreement for Urea and Creatinine clearances over a published range of blood and dialyzate flow rates. This model predicts clearances with a maximum error of less than 4% for both Urea and Creatinine when blood flow is 75% of the dialyzate flow. However, when both blood and dialyzate flows are identical the model over predicts the experimental data by 1.47% in the case of Urea and 4.75 for Creatinine flows of 300 ml/min. Although the concentration profile is an infinite series involving confluent hypergeometric functions, 2 terms of the series were sufficient (Mathematica notebook program) to produce these results. Overall mass transfer coefficients can now be deduced from the Sherwood numbers and provide possible improvement over currently used area coefficients.

Prediction of Steel Transformation Temperatures Using Thermodynamic Modeling and Design of Experiments (DOE)

2018 ◽  
Vol 941 ◽  
pp. 2284-2289
Author(s):  
Abdelhalim Loucif ◽  
Heithem Touazine ◽  
Mohammad Jahazi
Keyword(s):  
Experimental Data ◽  
Design Of Experiments ◽  
Maximum Error ◽  
Simple Approach ◽  
Alloying Element ◽  
Transformation Temperatures ◽  
Combined Use ◽  
The Impact ◽  
Liquidus Temperatures ◽  
Good Agreement

This paper presents a methodology in order to predict A1, solidus and liquidus temperatures using a relatively simple approach. The proposed approach is based on the combined use of the thermodynamic software Thermo-Calc and the composite centered design of experiments (DOE) method. Four important alloying elements (C, Ni, Mn and Cr) were considered in the DOE. The impact of each alloying element on the transformation temperatures was determined and discussed. It was found that carbon has the most important impact on solidus and liquidus whereas Ni, Mn, and Cr have a significant impact on A1. The proposed models were generated using Analysis of Variance (ANOVA) method. A good agreement between experimental and predicted results was found with a maximum error of 1.1 % for transformation temperatures. Furthermore, the proposed models were validated using a large amount of experimental data published in the literature with a maximum error equal to 7.8 %.

scholarly journals Modeling the process of grinding feed by the method of damage accumulation

2021 ◽  
Vol 284 ◽  
pp. 02021
Author(s):  
Timmo Gavrilov
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Energy Consumption ◽  
Damage Accumulation ◽  
Optimal Number ◽  
Grinding Process ◽  
Technological Parameters ◽  
Number Of Cycles ◽  
Working Bodies ◽  
Good Agreement

The efficiency of the process of grinding meat and bone feed depends on a number of design and technological parameters of the grinder operation. One of the most significant issues and at the same time the least studied one is the influence of the number of cycles of loading meat and bone feed with the working bodies of grinders on the particle size of the finished meat and bone feed. To study this issue, the authors proposed a method for modeling the process of grinding meat and bone feed using a stochastic B-model of cumulative damage, which is based on an understanding of the process under study at the macroscopic level and experimental data. The constructed B-model made it possible to determine the optimal number of cycles of loading meat and bone feed with the working bodies of the grinders, at which the required particle size of the finished meat and bone feed is 3...5 mm, and there is no unnecessary energy consumption of the grinding process. This number is equal to 12...18 cycles. The results obtained by the B-model are in good agreement with the experimental data. The constructed B-model of the grinding process of meat and bone feed will further help optimizing the operation of the cutting device and reducing energy consumption for the operation of the grinders as a whole.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

Antrodia pini-cubensis, a new polypore from the Caribbean area.

1994 ◽  
Vol 47 (3) ◽  
pp. 189-192 ◽  
Author(s):  
Petr Vampola ◽  
František Kotlaba ◽  
Zdeněk Pouzar
Keyword(s):  
Caribbean Area ◽  
The Caribbean

LIQUIDUS THERMO-BAROMETER FOR THE MODELING OF MAGNETITE — MELT EQUILIBRIUM

2018 ◽  
pp. 71-80
Author(s):  
N. S. Aryaeva ◽  
E. V. Koptev-Dvornikov ◽  
D. A. Bychkov
Keyword(s):  
Experimental Data ◽  
Liquidus Temperature ◽  
Vertical Structure ◽  
Maximum Error ◽  
Silicate Melt ◽  
System Of Equations ◽  
Wide Range ◽  
Basaltic Melts ◽  
Multidimensional Statistics

A system of equations of thermobarometer for magnetite-silicate melt equilibrium was obtained by method of multidimensional statistics of 93 experimental data of a magnetite solubility in basaltic melts. Equations reproduce experimental data in a wide range of basalt compositions, temperatures and pressures with small errors. Verification of thermobarometers showed the maximum error in liquidus temperature reproducing does not exceed ±7 °C. The level of cumulative magnetite appearance in the vertical structure of Tsypringa, Kivakka, Burakovsky intrusions predicted with errors from ±10 to ±50 m.

Predicting the Effect of Tire Tread Pattern Design on Thick Film Wet Traction

1977 ◽  
Vol 5 (1) ◽  
pp. 6-28 ◽  
Author(s):  
A. L. Browne
Keyword(s):  
Experimental Data ◽  
Network Design ◽  
Thick Film ◽  
Digital Computer ◽  
Analytical Tool ◽  
Design Practice ◽  
Pattern Design ◽  
Performance Results ◽  
Good Agreement

Abstract An analytical tool is presented for the prediction of the effects of changes in tread pattern design on thick film wet traction performance. Results are reported for studies in which the analysis, implemented on a digital computer, was used to determine the effect of different tread geometry features, among these being the number, width, and lateral spacing of longitudinal grooves and the angle of zigzags in longitudinal grooves, on thick film wet traction. These results are shown to be in good agreement with experimental data appearing in the literature and are used to formulate guidelines for tread groove network design practice.

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