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Items from 1 to 20 out of 2,064 results

article

Eco-innovative method of cleaning heat exchangers from boiler scale

Olczak, Piotr, Kowalski, Zygmunt, Kulczycka, Joanna, Makara, Agnieszka, more

Management and Production Engineering Review > 2020 > 11 > 1

article

Design consideration of supercritical CO2 power cycle integral experiment loop

Yoonhan Ahn, Jekyoung Lee, Seong Gu Kim, Jeong Ik Lee, more

Energy > 2015 > 86 > Complete > 115-127

Supercritical-CO ₂ Brayton cycle has been recently gaining a lot of attention for the mild temperature (450–650 °C) heat source application due to its high efficiency and compact footprint as the system layout of S–CO ₂ cycle is simple and small turbomachinery and compact micro-channel heat exchangers are utilized. As CO ₂ properties behave more like an incompressible fluid...

article

Experimental investigation of heat transfer characteristics of nanofluid using parallel flow, counter flow and shell and tube heat exhanger

Dharmalingam, R., Sivagnanaprabhu, K.K., Yogaraja, J., Gunasekaran, S., more

Archive of Mechanical Engineering > 2015 > 62 > 4

article

Experimental investigation and modelling of a low temperature PCM thermal energy exchange and storage system

Fabien Rouault, Denis Bruneau, Patrick Sébastian, Jérôme Lopez, more

Energy & Buildings > 2014 > 83 > Complete > 96-107

A real-scale latent heat thermal energy storage (LHTES) device has been designed and set up for air-cooling in the housing sector. This system uses the thermal gap between night-time and daytime outdoor air to refresh the indoor air. The air passes along a box-section horizontal tube bundle filled with paraffin wax (phase change material). To develop a design tool, a one-dimensional model is proposed...

article

Bed geometries, fueling strategies and optimization of heat exchanger designs in metal hydride storage systems for automotive applications: A review

Andrea Mazzucco, Martin Dornheim, Michael Sloth, Torben R. Jensen, more

International Journal of Hydrogen Energy > 2014 > 39 > 30 > 17054- 17074

This review presents recent developments for effective heat management systems to be integrated in metal hydride storage tanks, and investigates the performance improvements and limitations of each particular solution. High pressures and high temperatures metal hydrides can lead to different design considerations, which are discussed in the paper. Studies analyzing design procedures based upon different...

article

Heat transfer of laminar oscillating flow in finned heat exchanger of pulse tube refrigerator

K. Tang, J. Yu, T. Jin, Y.P. Wang, more

International Journal of Heat and Mass Transfer > 2014 > 70 > Complete > 811-818

In order to characterize the heat transfer of heat exchangers employed by pulse tube refrigerators, an experimental apparatus was built to investigate the heat transfer performance of a water-cooled finned heat exchanger operating in laminar oscillating flow. The test results summarized into the Nusselt number with respect to the maximum Reynolds number and the Valensi number were presented. The increases...

article

Computational analysis for the effect of the taper angle and helical pitch on the heat transfer characteristics of the helical cone coils

Elazm, Mohamed Abo, Ragheb, Ahmed, Elsafty, Ahmed, Teamah, Mohamed, more

Archive of Mechanical Engineering > 2012 > 59 > 3

chapter

Influences of twisted-tape with parallel rectangular-wing on thermal performance of a heat exchanger

P. Eiamsa-ard, C. Thianpong, S. Eiamsa-ard

2011 International Conference & Utility Exhibition on Power and Energy Systems: Issues and Prospects for Asia (ICUE) > 1 - 6

2011 International Conference & Utility Exhibition on Power and Energy Systems: Issues and Prospects for Asia (ICUE)

The present paper reports heat transfer enhancement and friction factor characteristics in the tubes inserted with rectangular-winged twisted-tapes (TT-RWs). The wing-depth ratio (d/W) was varied from 0.1 to 0.3 while the tape-twist ratio was kept constant at y/W = 4.0. The experiments were conducted under uniform heat flux condition for Reynolds number between 5500 and 20,200 (based on the inner...

article

Topology optimization of convective heat transfer by the lattice Boltzmann method

Ji‐Wang Luo, Li Chen, An He, WenQuan Tao

International Journal for Numerical Methods in Fluids > 95 > 3 > 421 - 452

Topology optimization (TO) is a dependable approach to obtain innovative designs with improved performance. This study presents a TO method based on the adjoint lattice Boltzmann method (ALBM) and the level set method which is developed for both one‐way coupled and two‐way coupled convective heat transfer problems. The adjoint lattice Boltzmann model for fully coupled natural convection system is...

article

An autonomous robot for shell and tube heat exchanger inspection

Bujingda Zheng, Jheng‐Wun Su, Yunchao Xie, Jonathan Miles, more

Journal of Field Robotics > 39 > 8 > 1165 - 1177

Shell and tube heat exchangers (STHEs) are critical to energy conversion efficiency of power plants. Eddy current examination is a way to evaluate working conditions of these tubes. However, the current testing apparatus requires human to manually insert an eddy current testing (ECT) probe into and extract it out of individual tubes, and meanwhile monitor measurement results for diagnosis. It is a...

article

Parametric optimization of heat exchanger tube having twisted tape turbulent promoters and silicon oxide nanofluid

Rishabh Agarwal, Rajesh Maithani, Sachin Sharma, Anil Kumar, more

International Journal of Energy Research > 46 > 14 > 19394 - 19401

The optimization of heat exchanger tube parametric having

Si O_{2} / H_{2} O

based nanofluid flow through the twisted tape insert. The optimization basis is to maximize the heat transfer function and minimize the pressure drop function. The parameters selected for optimization are: twisted tape width to diameter ratio

(W_{T} / D_{T})

, twisted length to width ratio (

L_{T} / W_{T}

), and the nano particle concentration

(ϕ) .

The analysis...

article

An investigation on scaling failure of heat exchanger in cooling water system of natural gas purification plant

Jingjing Jiang, Ganghua Huang, Yanran Wang, Rui Fan

Asia‐Pacific Journal of Chemical Engineering > 17 > 5 > n/a - n/a

In this study, a natural gas purification plant adopts open circulating water system, which cannot work properly and hinder the normal production of natural gas due to the problems such as scaling and blockage in the operation of heat exchanger device was reported. Qualities of the make‐up water and recirculating cooling water were evaluated by parameters such as hardness, alkalinity, pH, and conductivity...

article

Iterative quality weighted interpolation for LPV‐MPC control of industrial heat exchanger under varying fouling conditions

Resma Madhu P. K., Jayalalitha Subbaiah

Asia‐Pacific Journal of Chemical Engineering > 17 > 5 > n/a - n/a

Fouling is an inevitable phenomenon that tends to change the dynamics of the heat exchanger (HE). An accurate prediction model describing these varying HE dynamics is demanded to implement model predictive control (MPC), which has been addressed in this work. A novel iterative quality weighted interpolation (IQWI) technique is proposed to determine the prediction model from the linear parametric varying...

article

Review on thermal performance of heat exchanger using phase change material

P. Das, S. P. Kar, R. K. Sarangi

International Journal of Energy Research > 46 > 12 > 16208 - 16240

This article reports detailed investigation of using different Phase Change Materials (PCM) in various designs of Thermal Energy Storage (TES) Devices: specifically, heat exchanger. The focus is on the performance analysis of different types of heat exchangers acting as TES having various PCMs which are substantially reviewed in this paper. The study highlights the difference in their geometry and...

article

Temperature Difference‐Based Fouling Detection in the Heat Exchanger of Gas‐Solid Fluidized Beds

Jae Won Choi, Seokhee Shin, Soo Youp Park, Pil-Sang Youn, more

Chemical Engineering & Technology > 45 > 9 > 1623 - 1630

Despite the harmfulness of absorbent fouling, its fundamental understanding is limited. The fouling behaviors in fluidized beds charged by CO₂ absorbent particles were therefore examined under various physical conditions to identify key parameters that can assist in the direct detection of absorbent fouling. The results demonstrate that the absorbent fouling conditions cooperatively rely on multiple...

article

Numerical study on thermal performance of water flow in a twisted duct heat exchanger

Musaab K. Rashed, Kadhum Audaa Jehhef, Faris Ali Badawy

International Journal of Applied Mechanics and Engineering > 2022 > Vol. 27, no. 2 > 199--216

This paper presents a numerical study of heat transfer through a downstream annulus using water as the working fluid within the laminar flow region. The annulus consisted of an outer twisted square duct and an inner circular pipe. A three-dimensional formulation was used to solve the Navier-Stokes equations numerically for the laminar flow system with a low Reynolds number. Three parameters were used...

article

Performance evaluation of coated carbon foam material in heat exchanger applications

Mohammad R. Almajali, Omar Quran, Khalid Lafdi

International Journal of Energy Research > 46 > 6 > 7872 - 7882

The overall decrease in the size and the weight of electronic components has led to high power dissipation and the need for innovative cooling designs. The current work presents an experimental study that has been conducted to use several types of pristine and coated carbon foams as heat sink and heat exchanger in a thermoelectric cooler for cooling vest application. Various parameters were measured...

article

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Farhad Afsharpanah, Khashayar Pakzad, Seyed Soheil Mousavi Ajarostaghi, Sébastien Poncet, more

International Journal of Energy Research > 46 > 6 > 7460 - 7478

Frequent power outage in developing countries has created many problems for the people living in these regions, one of the most important of which is food spoilage due to the rise of refrigerator temperature. Ice storage systems are one of the promising techniques for handling this difficulty. Computational simulations are done here to influence the effects of dimensionless parameters on the charging...

article

Elements of supercritical CO2 cycle - mathematical modeling and validation on available experimental data

Jarosław Milewski, Arkadiusz Szczęśniak, Łukasz Szablowski, Kamil Futyma, more

Journal of Power Technologies > 2022 > Vol. 102, nr 1 > 1--13

This paper presents models of three elements: heat exchanger, compressor and expander dedicated to supercritical CO2 cycles (Brayton). The models are built using Ebsilon software and validated against experimental data from available literature. Radial turbomachinery and thin plate heat exchangers were used to meet the demands of the relatively compact design of the S-CO2 cycle elements. It seems...

article

Economic analysis and drying kinetics of a geothermal‐assisted solar dryer for tomato paste drying

Tarik Hadibi, Abdelghani Boubekri, Djamel Mennouche, Abderrahmane Benhamza, more

Journal of the Science of Food and Agriculture > 101 > 15 > 6542 - 6551

BACKGROUND The economic value of many fruit and vegetables is often linked to the ability to preserve such natural products. In the case of tomatoes, the manufacture of 1 kg of powder or concentrate requires the evaporation of about 16 kg water kg⁻¹ dry matter. In the present work, the effectiveness and economic analysis of solar drying systems for drying of tomato paste with and without geothermal...

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Keywords

HEAT EXCHANGER (2,064)
HEAT TRANSFER (307)
WYMIENNIK CIEPŁA (207)
ÉCHANGEUR DE CHALEUR (152)
HEAT EXCHANGERS (114)
PRESSURE DROP (111)
HEATING (96)
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EXPÉRIMENTATION (56)
HEAT TRANSFER COEFFICIENT (54)
COOLING (51)
CFD (50)
FOULING (50)
MATHEMATICAL MODEL (49)
HEAT RECOVERY (46)
SIMULATION (45)
PERFORMANCE (44)
MODELLING (43)
CHUTE DE PRESSION (42)
FINNED TUBE (42)
CONDENSATION (39)
HEAT PUMP (39)
NUMERICAL SIMULATION (38)
NANOFLUID (37)
MODÉLISATION (36)
ECHANGEUR DE CHALEUR (33)
ELECTRON TUBES (32)
WATER HEATING (32)
TUBE AILETÉ (31)
MODELING (30)
THERMAL PERFORMANCE (30)
COMPUTATIONAL FLUID DYNAMICS (29)
TEMPERATURE MEASUREMENT (28)
WASTE HEAT RECOVERY (28)
AIR CONDITIONING (27)
ENERGY EFFICIENCY (27)
EVAPORATOR (27)
NUSSELT NUMBER (27)
CONDENSER (26)
FRICTION FACTOR (26)
GEOMETRY (26)
MICROCHANNEL (26)
EFFECTIVENESS (25)
FIN (24)
THERMOELECTRIC GENERATOR (24)
DESIGN (23)
EFFICIENCY (23)
HEAT PIPE (23)
NAUKI TECHNICZNE (23)
CARBON DIOXIDE (22)
CORROSION (22)
CORRELATION (21)
GÉOMÉTRIE (20)
TWO-PHASE FLOW (20)
WASTE HEAT (20)
REFRIGERATION (19)
BOILING (18)
CALCULATION (18)
HELICAL COIL (18)
NANOFLUIDS (18)
PROCESS CONTROL (18)
TEMPERATURE CONTROL (18)
VENTILATION (18)
CONDENSEUR (17)
DIOXYDE DE CARBONE (17)
ENTROPY GENERATION (17)
EXPERIMENTAL (17)
GENETIC ALGORITHM (17)
OPTIMISATION (17)
THERMAL ENERGY STORAGE (17)
THERMAL RESISTANCE (17)
FLUIDS (16)
LAMINAR FLOW (16)
MASS TRANSFER (16)
TEMPERATURE (16)
THERMAL CONDUCTIVITY (16)
VORTEX GENERATOR (16)
AILETTE (15)
ENERGY SAVING (15)
EQUATIONS (15)
FORCED CONVECTION (15)
HEAT AND MASS TRANSFER (15)
HEAT ENGINES (15)
POROUS MEDIUM (15)
POWER GENERATION (15)
REFRIGERANT (15)
SYSTÈME FRIGORIFIQUE (15)
TURBULENT FLOW (15)
ÉBULLITION (15)
ÉVAPORATEUR (15)
COEFFICIENT DE TRANSFERT DE CHALEUR (14)
COMPARISON (14)
EXERGY (14)
FLOW DISTRIBUTION (14)
HEAT PUMPS (14)
REFRIGERATION SYSTEM (14)
AMMONIA (13)
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Search results

Eco-innovative method of cleaning heat exchangers from boiler scale

Design consideration of supercritical CO2 power cycle integral experiment loop

Experimental investigation of heat transfer characteristics of nanofluid using parallel flow, counter flow and shell and tube heat exhanger

Experimental investigation and modelling of a low temperature PCM thermal energy exchange and storage system

Bed geometries, fueling strategies and optimization of heat exchanger designs in metal hydride storage systems for automotive applications: A review

Heat transfer of laminar oscillating flow in finned heat exchanger of pulse tube refrigerator

Computational analysis for the effect of the taper angle and helical pitch on the heat transfer characteristics of the helical cone coils

Influences of twisted-tape with parallel rectangular-wing on thermal performance of a heat exchanger

Topology optimization of convective heat transfer by the lattice Boltzmann method

An autonomous robot for shell and tube heat exchanger inspection

Parametric optimization of heat exchanger tube having twisted tape turbulent promoters and silicon oxide nanofluid

An investigation on scaling failure of heat exchanger in cooling water system of natural gas purification plant

Iterative quality weighted interpolation for LPV‐MPC control of industrial heat exchanger under varying fouling conditions

Review on thermal performance of heat exchanger using phase change material

Temperature Difference‐Based Fouling Detection in the Heat Exchanger of Gas‐Solid Fluidized Beds

Numerical study on thermal performance of water flow in a twisted duct heat exchanger

Performance evaluation of coated carbon foam material in heat exchanger applications

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Elements of supercritical CO2 cycle - mathematical modeling and validation on available experimental data

Economic analysis and drying kinetics of a geothermal‐assisted solar dryer for tomato paste drying

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