DETERMINATION OF INITIAL DATA FOR DESIGNING A DEVICE TO REMOVE CONDENSATE FROM THE RECUPERATOR OF VENTILATION EQUIPMENT

The technique is developed and equations are obtained for determining the volume of condensate formed in the exhaust air when it passes through the recuperator. The necessity of providing a ventila-tion unit with a device for capturing and removing condensate, which eliminates the formation of ice in the exhaust duct after the heat exchanger and, accordingly, reduces the cost of electricity for driving the exhaust fan is justified. Thermodynamic processes occurring in the humid removed air during its passage through the recuperator are investigated. For designing a device for capturing and removing condensate, dependences are obtained that make it possible to determine the consumption of condensate depending on the supply, temperature and relative humidity of the exhaust air, as well as the degree of its cooling at the outlet of the heat exchanger. To automate the calculations, an approximation of the known data is made and a polynomial is obtained to determine the dependence of the absolute humidity on the saturation line on the air temperature. The polynomial is made for the maximum temperature range of the heat exchanger. As an example, the operation of a ventilation unit equipped with a heat exchanger is considered in the workshop of an industrial enterprise with work category IIb during the cold period of the year with the supply of exhaust air of 45 103 m3 / h. To analyze the dependence of the volume of condensate on the parameters of exhaust air at the inlet and outlet of the heat exchanger, a series of calculations are performed using the Mathcad software package based on the developed methodology. A schematic diagram of a ventilation unit with a heat exchanger, equipped with a condensate removal device is developed. To exclude the formation of ice inside the recuperator, the air flow in it must be downward.

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Development of a heat exchanger for cogeneration via TEG

E3S Web of Conferences ◽

10.1051/e3sconf/202132102002 ◽

2021 ◽

Vol 321 ◽

pp. 02002

Author(s):

Björn Pfeiffelmann ◽

Michael Diederich ◽

Ali Cemal Benim ◽

Andreas Hamberger ◽

Markus Heese

Keyword(s):

Heat Exchanger ◽

Flue Gas ◽

Pareto Front ◽

Thermal Power ◽

Installation Space ◽

Maximum Temperature ◽

Thermoelectric Generators ◽

Biomass Boiler ◽

The Cost ◽

Minimal Effort

To develop an innovative cogeneration biomass boiler, which uses thermoelectric generators (TEG), a simplified model of the heat exchanger is created and the design is optimized. The boiler with a thermal power of 200 kW will partly convert the heat into electricity. The maximum temperature of the hot side of the TEG should not exceed 300°C to avoid damage. While holding these requirements the cost and the installation space of the heat exchanger should be as low as possible, with a minimal effort for the flue gas blowers at once. Following these objectives, the simplified heat exchanger model is optimized with NOMAD optimization algorithm. Out of the resulting Pareto front two heat exchanger designs are discussed.

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Determination of the dynamic load of the carrying structure of the hopper wagon with the actual dimensions of structural elements

Technology audit and production reserves ◽

10.15587/2706-5448.2021.225458 ◽

2021 ◽

Vol 1 (1(57)) ◽

pp. 6-11

Author(s):

Oleksij Fomin ◽

Alyona Lovska ◽

Pavel Skok ◽

Ivan Rogovskii

Keyword(s):

Mathematical Modeling ◽

Dynamic Loading ◽

Software Package ◽

Degrees Of Freedom ◽

Field Studies ◽

Middle Part ◽

Structural Elements ◽

Supporting Structure ◽

Mathcad Software

The object of research is the supporting structure of the pellet wagon with the actual dimensions of the supporting elements. One of the most problematic areas is the determination of the indicators of dynamics and strength of the supporting structure of the hopper wagon with the actual dimensions of the structural elements. A study of the dynamic loading of the supporting structure of the hopper wagon was carried out. At the same time, the actual dimensions of the structural elements were determined by means of field studies. Mathematical modeling of the dynamic loading of the load-carrying structure of a hopper wagon with the actual dimensions of structural elements was carried out by means of mathematical modeling. The studies were carried out in a flat coordinate system. The presence of three degrees of freedom of the supporting structure of the hopper wagon was taken into account: vibrations of twitching, bouncing and galloping. Differential equations were solved in the MathCad software package. In doing so, they were reduced to the Cauchy normal form, and then integrated using the Runge-Kutta method. It was found that the maximum value of the acceleration acting on the supporting structure of the hopper wagon is 38.5 m/s2, which is 2.7% higher than the acceleration of the supporting structure with nominal dimensions. Computer simulation of the dynamic loading of the supporting structure of the hopper wagon was carried out. The calculation was carried out using the finite element method in the SolidWorks Simulation (CosmosWorks) software package. It was found that the maximum accelerations are concentrated in the middle part of the supporting structure of the hopper wagon and amount to 36.2 m/s2. The F-criterion was used to verify the developed model. The calculations showed that the calculated value of the criterion is Fc = 1.09 and is less than the table value Ft = 3.29. The adequacy hypothesis is not rejected. The natural frequencies and vibration modes of the hopper wagon supporting structure were determined. It has been established that the values of natural vibration frequencies of the hopper wagon bearing structure with the actual dimensions of the structural elements are within the permissible limits. The research will contribute to the creation of relevant developments to extend the service life of wagons that have exhausted their standard resource, as well as to increase the efficiency of railway transport operation.

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Mekanisme Dan Proteksi Jaminan Nasabah Pada Gadai Informal

Liquidity ◽

10.32546/lq.v6i2.27 ◽

2017 ◽

Vol 6 (2) ◽

pp. 103-109

Author(s):

Yuri Nanda Larasati ◽

Jafril Khalil

Keyword(s):

Qualitative Research ◽

Research Methods ◽

Financial Services ◽

Field Data ◽

Qualitative Research Methods ◽

Research Field ◽

Consumer Society ◽

Library Research ◽

The Cost

Regulation of the financial services authority (OJK) No. 31/POJK.05/2016 on Venture had arranged that the financial services agency on the basis of the law of pledge is in coaching and supervision OJK. Yet the existence of laws – invitation to Governing Enterprise pawn shops causing business activities conducted by the above parties are not yet regulated. The condition is feared could cause harm to the consumer society. The purpose of this research is to know the procedures, mechanisms, protection of goods and guarantee the consumer on an informal pledge financing, methods of determination of the cost of maintenance of the goods and the goods of the execution mechanism of the pledge as well as protection for the collateral items are viewed from the side of the consumer by looking at laws-invitations and Sharia. To find out whether the pledge have gotten permission from OJK. This research uses qualitative research methods with the study of library research, field data and simulations. The approach used in this study is the empirical juridical approach. Elaboration upon the results is discussed further in this article.

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ANALYTICAL DETERMINATION OF LOUVERED-FIN HEAT EXCHANGER THERMAL PERFORMANCE IN RELATION WITH THE AIR FLOW STATISTICS

Proceeding of Proceedings of CHT-15. 6th International Symposium on ADVANCES IN COMPUTATIONAL HEAT TRANSFER , May 25-29, 2015, Rutgers University, New Brunswick, NJ, USA ◽

10.1615/ichmt.2015.intsympadvcomputheattransf.1090 ◽

2015 ◽

Author(s):

Mahmoud Khaled ◽

Mohamad Ramadan ◽

Ahmed Elmarakbi ◽

Fabien Harambat

Keyword(s):

Heat Exchanger ◽

Thermal Performance ◽

Air Flow ◽

Analytical Determination ◽

Louvered Fin

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The Awareness Level of the Safety and Health of the Operational Level

ADVANCES IN BUSINESS RESEARCH INTERNATIONAL JOURNAL ◽

10.24191/abrij.v3i1.10036 ◽

2017 ◽

Vol 3 (1) ◽

pp. 42

Author(s):

Roshanira Che Mohd Noor ◽

Nur Atiqah Rochin Demong

Keyword(s):

Health And Safety ◽

Health Conditions ◽

Effective Strategies ◽

Operational Level ◽

Safety And Health ◽

Health Factors ◽

The Cost ◽

The Relationship ◽

Awareness Level

Providing a safe and healthy workplace is one of the most effective strategies in for holding down the cost of doing construction business. It was a part of the overall management system to facilitate themanagement of the occupational health and safety risk that are associated with the business of the organization. Factors affected the awareness level inclusive of safety and health conditions, dangerous working area, long wait care and services and lack of emergency communication werethe contributed factors to the awareness level for the operational level. Total of 122 incidents happened at Telekom Malaysia Berhad as compared to year 2015 only 86 cases. Thus, the main objective of this study was to determine the relationship between safety and health factors and the awareness level among operational workers.The determination of this research was to increase the awareness level among the operational level workerswho committing to safety and health environment.

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Geotechnical investigation and testing. Geothermal testing. Determination of thermal conductivity of soil and rock using a borehole heat exchanger

10.3403/30284748u ◽

2015 ◽

Keyword(s):

Thermal Conductivity ◽

Heat Exchanger ◽

Borehole Heat Exchanger ◽

Geotechnical Investigation

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ANALISIS PERHITUNGAN HARGA POKOK PRODUKSI DAN PENENTUAN HARGA JUAL ATAS PRODUK (Studi Kasus Pada PT Dasa Windu Agung)

Jurnal Riset Manajemen dan Bisnis (JRMB) Fakultas Ekonomi UNIAT ◽

10.36226/jrmb.v1i2.23 ◽

2016 ◽

Vol 1 (2) ◽

pp. 183-190

Author(s):

Dwi Urip Wardoyo

Keyword(s):

Manufacturing Industry ◽

Sampling Method ◽

Manufacturing Companies ◽

Test Analysis ◽

Automotive Components ◽

Convenience Sampling ◽

Cost Of Production ◽

The Cost ◽

Keywords Cost

This study aims to determine the determination of the cost of production for products produced by PT. DWA. The Company is engaged in the manufacturing industry specialized in automotive components. Its activity is carried out through a series of production processes, so that expenses spent in the production will be calculated into the cost of the production sold. The population in this study were all manufacturing companies in Jakarta. Convenience sampling method selected one of the companies that get the confidence to assemble three national car project in Indonesia, namely Timor, Bakrie and Maleo. Test analysis used in this study is to test the calculation of full costing with job order costing. This study shows that (a) determination of the cost elements associated with the cost of production and (b) determining the cost of production on a product-based job costing with full costing approach. Keywords: cost of production, full costing

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Determination of the minimum number of technological bases of a part

10.36652/0042-4633-2020-9-73-75 ◽

2020 ◽

pp. 73-75

Author(s):

B.M. Bazrov ◽

T.M. Gaynutdinov

Keyword(s):

Cost Price ◽

Labor Input ◽

Part Surface ◽

Technological Base ◽

Size Accuracy ◽

Minimum Number ◽

The Cost ◽

Input Cost ◽

Selection Of

The selection of technological bases is considered before the choice of the type of billet and the development of the route of the technological process. A technique is proposed for selecting the minimum number of sets of technological bases according to the criterion of equality in the cost price of manufacturing the part according to the principle of unity and combination of bases at this stage. Keywords: part, surface, coordinating size, accuracy, design and technological base, labor input, cost price. [email protected]

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