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Compact Heat Exchangers
Published in Sadık Kakaç, Hongtan Liu, Anchasa Pramuanjaroenkij, Heat Exchangers, 2020
Sadık Kakaç, Hongtan Liu, Anchasa Pramuanjaroenkij
In this type, each channel is defined by two parallel plates separated by fins or spacers. Fins or spacers are sandwiched between parallel plates or formed tubes. Examples of compact plate heat exchangers are shown in Figure 10.2.4 Fins are attached to the plates by brazing, soldering, adhesive bonding, welding, mechanical fit, or extrusion. Alternate fluid passages are connected in parallel by end heads to form two sides of a heat exchanger. Fins are employed on both sides in gas-to-gas heat exchangers.
Medium-Scale Cooling: Thermoelectric Module Technology
Published in D.M. Rowe, CRC Handbook of Thermoelectrics, 2018
Fins are generally made of copper or aluminum. Aluminum is generally preferred because of the lower weight. Copper is easy to solder, whereas aluminum is more difficult. The techniques generally require that at least one of the parts be clad with an alloy of aluminum-silicium, which melts at a slightly lower temperature than pure aluminum. The parts can be bonded by: (1) dipping in a salt bath, which creates a pollution control problem;
Natural-Convection Systems
Published in William S. Janna, Engineering Heat Transfer, 2018
Fins are attached to a surface to increase the surface area, providing a means for transferring more heat away. The addition of a fin, however, also introduces a conduction resistance to heat transfer. The interaction between the convection and conduction heat-transfer modes is therefore an important consideration in fin design.
Experimental and Artificial Neural Network Evaluation of Frost Formation on Square Finned Tube under Natural Convection
Published in Heat Transfer Engineering, 2023
Soroush Abadi Iranagh, Ali Reza Tahavvor, Mahmood Yaghoubi, Mohammad Mehdi Tavakol
Fins are utilized for various purposes such as air conditioning operations, heating systems, refrigeration, finned-heat exchangers, ventilation, solar processes, electric cooling, electrical systems, etc. The frost layer forming on the tubes and fins causes heat and performance loss by impacting variables such as air properties, wall temperature, and air humidity. Frost forms when the surface temperature is lower than the freezing point of water and the dew point of the air. This exchanging phenomenon limits the airflow area by obstructing the flow channel, raising thermal resistance, and subsequently lowering the heat transfer rate of the system. Fins are widely used in various heating, ventilation, and air conditioning applications due to their geometrical properties such as evaporators in cooling systems, oil coolers, refrigerators, and heat exchangers. Also, fins are available in a wide range of shapes. The square-finned tube is specially used in incinerating devices, economizing systems, and air conditioners.
Heat transfer analysis of an inclined porous fin using Differential Transform Method
Published in International Journal of Ambient Energy, 2022
In many engineering applications, such as gas turbines, air conditioning, microprocessor, radiators, automobiles, air craft engines, etc., the management of excess heat release during the thermal process is an important task. In this aspect, an enhancement in the heat transfer rate is one of the most interesting studies to date. There is a need for more efficient, light-weighted and cost-effective models for managing heat. Several ways are implemented to enhance heat transfer and among them one of the effective methods is by attaching fin to the primary surface, to provide an additional surface area. Fin is used in heat exchanging devices such as car radiators, computer CPU heat sinks, heat exchangers, super heaters, refrigeration, electrical equipment, etc. In view of this, (Kiwan and Al-Nimr 2001) introduced a novel method to improve the heat transfer phenomenon. That is, porous fin concept. The pores in the fin reduce the fin material and weight. The fin performance and optimisation of this porous fin have been analysed. (Gorla and Bakier 2011) have taken the porous fin and explained the impact of natural convection as well as radiation under three different fin cases such as long fin, insulted tip fin and convective tip fin. (Hoseinzadeh et al. 2019) have comparatively studied the numerical and analytical solution of a thermal performance of a porous fin. An attempt to scrutinise the heat transfer process in a porous fin attached to inclined surface has been made by (Kiwan 2019).
Effect of material and geometric parameters on natural convection heat transfer over an eccentric annular-finned tube
Published in International Journal of Ambient Energy, 2021
Issam Fourar, Abdelmoumene Hakim Benmachiche, Said Abboudi
In industrial applications, the demand of the natural convection heat transfer increases with the advance in technologies such as the cooling of electronic compounds, internal and external combustion engines, air cooling systems for air conditioning and refrigeration. The heat transfer in different heat exchanger types with fins has been studied thoroughly. Many researchers carried out extensive studies on the structure of heat exchangers and a lot of their studies deal with the optimisation and improvement of heat transfer for finned tube with annular fin. They come up with various form of fins, such as perforated fin, segment fin, hyperbolic annular fin, porous fins, inclined Plate Fins, eccentricity fin, B-spline curve annular fin, Annular Step Fin, helm-shaped fin, Rectangular Fins, etc.