scholarly journals Analisa dan Desain Compact Condensor di Pembangkit Listrik Tenaga Gas dan Uap (PLTGU) Tanjung Priok

Jurnal METTEK ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 37
Author(s):  
I Wayan Sutina ◽  
I Gusti Bagus Wijaya Kusuma ◽  
I Gusti Ngurah Priambadi
Keyword(s):  
Pressure Drop ◽  
Heat Transfer Process ◽  
Large Area ◽  
Steam Power ◽  
Fin Efficiency ◽  
Simulation Process ◽  
Water Side ◽  
Calculation Process ◽  
Design Calculations ◽  
Drop Water

Kondensor merupakan salah satu komponen penukar panas yang berfungsi untuk membuang panas dari fluida uap air (steam) pada sebuah sistem pembangkit listrik tenaga gas dan uap (PLTGU). Namun komponen kondensor ini memiliki dimensi yang cukup besar sehingga memerlukan lahan yang luas. Penelitian ini dilakukan untuk mendapatkan dimensi kondensor yang lebih ringkas (compact) yang memerlukan lahan yang sedikit dalam penerapannya dilapangan. Desain Compact kondensor diawali dengan pengambilan data dilapangan, menghitung efisiensi kondensor awal (0,44), dan proses simulasi pada aplikasi CFD desain kondensor exisiting untuk mengetahui gambara dari proses perpindahan panas yang terjadi. Proses perhitungan untuk desain compact kondensor dilakukan untuk mendapatkan ukuran dimensi dan kinerja compact kondensor. Dari hasil perhitungan desain yang dilakukan didapatkan dimensi compact kondensor dengan panjang : 2 ft = 0,6096 m, lebar : 1 ft = 0,3048 m, dan tinggi 8 ft = 2,4384 m, dengan Volume Compact kondensor = 16 ft3 = 4,8768 m3, Efisiensi Sirip : 0.924027, Efisiensi Sirip Overall: 0.936563, Efisiensi kondensor : 0.60, Pressure Drop Sisi uap : 0,5184 Bar, Pressure Drop Sisi air : 1,4734 Bar, Daya Sisi uap : 70.43555 Watt, Daya Sisi air : 25.03529 Watt. Nilai efisiensi yang dihasilkan dari desain compact kondensor lebih tinggi dibandingkan dengan kondensor awal dengan dimensi yang lebih kecil.  The condenser is one of the heat exchanger components that functions to remove heat from the water vapor fluid (steam) in a gas and steam power plant (PLTGU) system. However, this condenser component has dimensions large enough to require a large area. This research was conducted to obtain a condenser dimension that is more compact (compact) which requires less land in its application in the field. Compact condenser design begins with data collection in the field, calculating the efficiency of the initial condenser (0.44), and the simulation process in the application of the exisiting condenser CFD design to find out the details of the heat transfer process that occurs. The calculation process for compact condenser design is carried out to get the dimensions and compact condenser size. From the results of design calculations performed, the dimensions of the compact condenser with length: 2 ft = 0.6096 m, width: 1 ft = 0.3048 m, and height 8 ft = 2.4384 m, with condenser Compact Volume = 16 ft3 = 4 , 8768 m3, Fin Efficiency: 0.924027, Overall Fin Efficiency: 0.936563, Condenser efficiency: 0.60, Pressure Drop Vapor side: 0.5184 Bar, Pressure Drop Water side: 1.4734 Bar, Steam Side Power: 70.43555 Watt, Water Side Power : 25,03529 Watt. The efficiency value resulting from the compact condenser design is higher than the initial condenser with smaller dimensions.

scholarly journals Numerical Prediction of Heat Transfer Characteristics of Nanofluids in a Minichannel Flow

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Arjumand Adil ◽  
Sonam Gupta ◽  
Pradyumna Ghosh
Keyword(s):  
Heat Transfer ◽  
Brownian Motion ◽  
Pressure Drop ◽  
Laminar Flow ◽  
Computational Model ◽  
Flow Regime ◽  
Cfd Simulation ◽  
Computational Results ◽  
Heat Transfer Characteristics ◽  
Simulation Process

CFD simulation of the heat transfer and pressure drop characteristics of different nanofluids in a minichannel flow has been explained using FLUENT version 6.3.26. Different nanofluids with nanoparticles of Al2O3, CuO, SiO2, and TiO2have been used in the simulation process. A comparison of the experimental and computational results has been made for the heat transfer and pressure drop characteristics for the case of Al2O3-water nanofluid for the laminar flow. Also, computations have been made by considering Brownian motion as well as without considering Brownian motion of the nanoparticles. After verification of the computational model with the experimental results for Al2O3-water nanofluid, the simulations were performed for the same experimental readings for different nanofluids in the laminar flow regime to find out the heat transfer and pressure drop characteristics.

Some Factors in the Design of Surface Condensing Plant

1934 ◽  
Vol 126 (1) ◽  
pp. 227-323 ◽  
Author(s):  
H. L. Guy ◽  
E. V. Winstanley
Keyword(s):  
Pressure Drop ◽  
Poor Performance ◽  
Mean Value ◽  
Heat Transmission ◽  
Accurate Analysis ◽  
Effect Of Pressure ◽  
Circulating Water ◽  
Water Side ◽  
Standard Values ◽  
The Mean

It is suggested that the poor performance of certain large surface condensers is due to pressure drop on the steam side. Tests are given showing the pressure drop for various patterns of tube plates and illustrating the steps taken to reduce it. The effect of pressure drop upon the mean temperature difference is discussed. The limitations of accepted formulae are criticized and the results of more accurate analysis are presented. The results of Eagle and Ferguson's tests on heat transmission from tube to water are presented in terms of the external surface for the range of normal condensing plant. Utilizing these results, the overall rates of heat transmission from a large number of tests on commercial condensers are analysed in order to obtain the rate of heat transmission from steam to tube, and after a discussion of the results a mean value is suggested. A set of curves of overall rates of heat transmission on this basis is presented as applicable to brushed tubes. A method of obtaining the net heat rejected to the circulating water in power plant is developed and the departure from the conventional figure of 1,000 B.Th.U. per lb. is brought out. The results obtained on a series of tests on individual tubes in a complete condenser are analysed and commented upon. The paper also deals with the effect of tube fouling upon the overall rate of heat transmission, and methods of obtaining a margin in surface to allow for this are discussed. The effect of pressure drop upon the duty of an air extraction plant and certain problems arising therewith are discussed. Some actual air leakage tests are given and compared with recognized standard allowances. The authors deal with the friction on the water side of condensers and give test figures of the friction in the tube with various methods of tube plate fastenings. Recommended standard values of the various factors for assessing condenser water friction are given, together with tests from commercial installations. The paper concludes with a treatment of the problem of syphonic return in condenser circulating water systems and gives a method of calculating the syphonic efficiency.

Shape and Size Optimization Design of Finned Brass Tube on the Central Air Conditioning

2012 ◽  
Vol 588-589 ◽  
pp. 1854-1857
Author(s):  
Shuang Chen ◽  
Bing Yan Zhang ◽  
Jian Hua Zhong
Keyword(s):  
Heat Transfer ◽  
Transfer Process ◽  
Optimization Design ◽  
Heat Transfer Process ◽  
Finned Tube ◽  
Structure Parameters ◽  
Finite Element Program ◽  
Fin Efficiency ◽  
Heat Transfer Theory ◽  
Element Program

Finned tube heat transfer process was analyzed in this thesis, the optimal mathematical model of the fin efficiency and fin volume which was acted as the objective function is established based on the model of heat transfer theory. The heat exchanger numerical simulation of finned tube is taken by the ANSYS finite element program in heat transfer process, and the finned tube structure parameters ( fin spacing , fin thickness , fin height) were analyzed , the optimum structure parameters of a set of finned tube were obtained at the same time. These studies will have some guidance on the application of finned tubes.

Local and Average Characteristics of Heat/Mass Transfer Over Flat Tube Bank Fin With Four Vortex Generators per Tube

2002 ◽  
Vol 124 (3) ◽  
pp. 546-552 ◽  
Author(s):  
L. B. Wang ◽  
F. Ke ◽  
S. D. Gao ◽  
Y. G. Mei
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Nusselt Number ◽  
Pressure Drop ◽  
Heat Transfer Process ◽  
Attack Angle ◽  
Vortex Generators ◽  
Back Surface ◽  
Flat Tube ◽  
Fin Spacing

The analogy between heat and mass transfer has been used to obtain local and average heat transfer characteristics over a complete flat tube-fin element with four vortex generators (VGs) per tube. Several types of surfaces involved in heat transfer process such as fin surface mounted with VGs, its back surface (mounted without VGs) and flat tube surface are considered. The mass transfer experiments are performed using naphthalene sublimation method. The effects of the fin spacing and VG parameters such as height and attack angle on heat transfer and pressure drop are investigated. The comparisons of heat transfer enhancement with flat tube-fin element without VG enhancement under three constraints are carried out. The local Nusselt number distribution reveals that VGs can efficiently enhance the heat transfer in the region near flat tube on fin surface mounted with VGs. On its back surface the enhancement is almost the same as on the fin surface mounted with VGs but enhanced region is away from flat tube wall with some distance. Average results reveal that increasing of VG height and attack angle increases the enhancement of heat transfer and pressure drop, whereas small fin spacing causes greater increase of pressure drop. The heat transfer performance, correlations of Nusselt number and friction factor are also given.

scholarly journals Ice slurry flow and heat transfer during flow through tubes of rectangular and slit cross-sections

2014 ◽  
Vol 35 (3) ◽  
pp. 171-190
Author(s):  
Beata Niezgoda-Żelasko ◽  
Jerzy Żelasko
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Cross Sections ◽  
Heat Transfer Process ◽  
Solid Particles ◽  
Ice Slurry ◽  
Slurry Flow ◽  
Transfer Coefficients ◽  
Laminar And Turbulent Flow ◽  
Flow Through

Abstract The paper presents the results of experimental research of pressure drop and heat transfer coefficients of ice slurry during its flow through tubes of rectangular and slit cross-sections. Moreover, the work discusses the influence of solid particles, type of motion and cross-section on the changes in the pressure drop and heat transfer coefficient. The analysis presented in the paper allows for identification of the criterial relations used to calculate the Fanning factor and the Nusselt number for laminar and turbulent flow, taking into account elements such as phase change, which accompanies the heat transfer process. Ice slurry flow is treated as a generalized flow of a non-Newtonian fluid.

Heat Transfer and Pressure Drop During Condensation of Ammonia in Microchannels

2012 ◽  
Author(s):  
Brian M. Fronk ◽  
Srinivas Garimella
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Heat Transfer Process ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Transfer Coefficients ◽  
Process Data ◽  
Improve Energy Efficiency ◽  
Tube Heat Exchanger ◽  
Component Size

An experimental investigation of condensation heat transfer and pressure drop of ammonia flowing through a single, circular, microchannel (D = 1.435 mm) was conducted. The use of ammonia in thermal systems is attractive due to its high latent heat, favorable transport properties, zero ozone depletion (ODP), and zero global warming potential (GWP). At the same time, microchannel condensers are also being adopted to increase heat transfer performance to reduce component size and improve energy efficiency. While there is a growing body of research on condensation of conventional refrigerants (i.e., R134a, R404A, etc.) in microchannels, there are few data on condensation of ammonia at the microscale. Ammonia has significantly different fluid properties than synthetic HFC and HCFC refrigerants. For example, at Tsat = 60°C, ammonia has a surface tension 3.2 times and an enthalpy of vaporization 7.2 times greater than those of R134a. Thus, models validated with data for synthetic refrigerants may not predict condensation of ammonia with sufficient accuracy. The test section consisted of a stainless steel tube-in-tube heat exchanger with ammonia flowing through a microchannel inner tube and cooling water flowing through the annulus in counterflow. A high flow rate of water was maintained to provide an approximately isothermal heat sink and to ensure the condensation thermal resistance dominated the heat transfer process. Data were obtained at mass fluxes of 75 and 150 kg m−2 s−1, multiple saturation temperatures, and in small quality increments (Δx∼15–25%) from 0 to 1. Trends in heat transfer coefficients and pressure drops are discussed and the results are used to assess the applicability of models developed for both macro and microscale geometries for predicting the condensation of ammonia.

Using Fresh Air in Windbox Repowering of Existing Steam Power Plants

2007 ◽  
Author(s):  
V. Nayyeri ◽  
P. Asna Ashary
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Power Plants ◽  
Flame Temperature ◽  
Heat Transfer Process ◽  
Low Oxygen ◽  
Steam Power ◽  
Steam Power Plants ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

Repowering is increasing efficiency and output power of an existing steam power plants by integration them with gas turbine. Several approaches are proposed for repowering regards to condition of existing power plants. One of those approaches which provides opportunity for existing boiler reusing is windbox repowering. In this method, one or several gas turbines are installed near the existing steam unit and the exhaust of gas turbines is used as preheated combustion air for boiler. The main difficulty in integration of gas turbine and boiler is decreasing flame temperature in supplementary combustion of boiler due to low oxygen content of gas turbine exhaust compared with fresh air and its effect on heat transfer process especially in radiative sections. When advanced gas turbines are used in windbox repowering, the fresh air should be used for increasing oxygen due to low oxygen percent. In this study, the effect of using fresh air in wind box repowering will be investigated and two main arrangements, preheating and not preheating of fresh air will be compared. This study shows the advantages of using preheated air for mixing with gas turbine exhaust when advanced gas turbines are used for windbox repowering.

Performance of Dehumidifying Heat Exchangers With and Without Wetting Coatings

1999 ◽  
Vol 121 (4) ◽  
pp. 1018-1026 ◽  
Author(s):  
K. Hong ◽  
R. L. Webb
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Pressure Drop ◽  
Transfer Coefficient ◽  
Heat Exchangers ◽  
Finned Tube ◽  
Fin Efficiency ◽  
Dry Heat ◽  
Reduction Methods ◽  
Wet Surface

Limited previous work has shown that use of special hydrophilic coatings will provide lower air pressure drop in finned tube heat exchangers operated under dehumidifying conditions. However, no detailed work has been reported on the effect of different coating types, or different fin surface geometries on the wet pressure drop. In this study, wind tunnel tests were performed on three different fin geometries (wavy, lanced, and louver) under wet and dry conditions. All dehumidification tests were done for fully wet surface conditions. For each geometry, the tests were performed on uncoated and coated heat exchangers. For all three fin geometries, the wet-to-dry pressure drop ratio was 1.2 at 2.5 m/s frontal air velocity. The coatings have no influence on the wet or dry heat transfer coefficient. However, the wet surface heat transfer coefficient was 10 to 30 percent less than the dry heat transfer coefficient, depending on the particular fin geometry. The effect of the fin press oil on wet pressure drop was also studied. If the oil contains a surfactant, good temporary wetting can be obtained on an uncoated surface; however, this effect is quickly degraded as the oil is washed from the surface during wet operation. This work also provides a critical assessment of data reduction methods for wet surface operation, including calculation of the fin efficiency.

Sign in / Sign up

Export Citation Format

Share Document