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Thermal Energy Management
Published in Anil Kumar, Om Prakash, Prashant Singh Chauhan, Samsher, Energy Management, 2020
Anil Kumar, Om Prakash, Prashant Singh Chauhan, Samsher
The cost of heat exchange surfaces is one of the important economic consideration when the temperature differences between fluids are not high. Such kind of problem can be overcome by using plate type heat exchanger. It has series of separate parallel plates arrangement making thin flow pass. The plates are separated from the adjacent plates by using gaskets and the steam is passed parallelly in the alternative plates while fluid to be heated passes in between the hot plates. Corrugated plate can be used in order to increase the rate of heat transfer. The hot liquid is passed through the bottom port and is allowed to move upward among every alternate plate while the liquid of cold nature is at the top of the head and is passed downwards alternatively. When the direction of the fluids are opposite, such configuration is called counter current. Plate heat exchangers are extensively used in pharmaceutical plant, food industries, refineries, etc.
Heating and Cooling Processes for Foods
Published in Dennis R. Heldman, Daryl B. Lund, Cristina M. Sabliov, Handbook of Food Engineering, 2018
R. Paul. Singh, Gail Bornhorst
Plate heat exchangers are commonly used in heating and cooling applications in the dairy and food beverage industry. A schematic diagram of a plate heat exchanger is shown in Figure 6.7. The heat exchanger consists of closely spaced metal plates parallel to each other and held securely in a metal frame. The plates are often corrugated to induce turbulence in the flowing liquid. The ports and edges of the plate are sealed with gaskets to prevent intermixing of the liquid streams. Since the food product flows in a thin film over the heat transfer area, the retention time is small, thus reducing thermal damage to the product. The fluids can be pumped in concurrent or countercurrent flow with respect to the heat transfer medium. The plates can easily be removed for cleaning or changing the surface area; thus, the desired heat flux can easily be obtained.
Basic Principles of Catalytic Reforming Processes
Published in Soni O. Oyekan, Catalytic Naphtha Reforming Process, 2018
Plate heat exchangers are usually composed of many thin, separated plates that have large surface areas and small spaces between the alternate plates that enhance heat transfer between fluids. In special designs popularized by Alfa Laval, the plates are stacked and welded at the perimeter and formed into a bundle. Within this bundle of welded plates, hot and cold fluids flow separately between alternate plates. Welded plate heat exchangers are used in oil refining, especially in catalytic processes that operate in low to medium pressures relative to the robust shell and tube heat exchangers that operate in medium- to high-pressure processes. Alfa Laval tout their welded plate exchanger as having the highest thermal efficiencies in its class. According to Alfa Laval, the welded plate heat exchanger design is compact and has lower total emissions and lower capital and operating expenses relative to shell and tube heat exchangers. Over the past two decades, enhancements have been made to welded plate exchangers to enable them to be amenable to faster and cheaper cleaning relative to earlier welded plate heat exchangers.(31) The alternating flow of cold and hot fluids is shown in Figure 4.28. The bundle of welded plates that constitutes the heat exchanger is then enclosed in a huge shell to protect the bundle, as shown in Figure 4.29.
A new method for heat transfer and fluid flow performance simulation of plate heat exchangers
Published in Numerical Heat Transfer, Part B: Fundamentals, 2019
Chao Bai, Guanmin Zhang, Yan Qiu, Xueli Leng, Maocheng Tian
Due to these advantages, plate heat exchangers have been widely used in dairy, food, oil, chemical, refrigeration, and heat recovery areas. And investigations on them also fast develop [1]. For design of the whole plate heat exchanger, different algorithms or mathematical models are proposed to simulate the steady-state performance of plate heat exchangers with different combinations of configurations [2–4]. Also, there are methods for optimal design of plate heat exchanger such as the screening method [5]. For hydrodynamic and thermal investigations on channel flows separated by plates, numerical studies are conducted for a unitary cell formed by plates under from transitional to turbulent conditions [6–8]. Other researchers select typical sections of plates to simulate the heat transfer and fluid flow performances [9, 10]. Still there are both experimental and numerical investigations on the whole channel formed by different kinds of plates [11–17].
Design and development of a 10-kWe ORC installation working with low-temperature sources
Published in International Journal of Sustainable Energy, 2018
Maria K. Koukou, Michalis Gr. Vrachopoulos, Nikos Tachos, Nikos Tsolakoglou
The heat exchangers that can be used in an ORC system for vaporisation and condensation of the cooling medium may be: (a) plate heat exchangers, (b) shell-and-tube and (c) other spiral type, e.g. for direct expansion on cooling tower etc. The plate heat exchangers are devices of high heat transfer rates with a relatively small volume, compared with other heat exchangers. Furthermore, the plate heat exchangers are extremely reliable and require frequent maintenance. They are available from numerous suppliers involved in heat transfer equipment, which have a wide variety of products for every application. In this work, the model CB200-80H of Alfa Laval®, 200 kW was used as a condenser. The model AC220EQ-250AH-F of Alfa Laval®, 200 kW was used as an evaporator. Both models are plate and frame heat exchangers consisting of stainless steel plates (Table 1).
Multi-objective optimization of non-uniform plate heat exchanger with dimples/protrusions for heat recovery of setting machines
Published in Numerical Heat Transfer, Part A: Applications, 2023
Mengdi Guo, Wenhao Pu, Qi Zhang, Zhaohui Yao, Yubin Qin, Jiabin Wang
As the key equipment for heat transfer, the plate heat exchanger has the characteristics of high heat transfer coefficient, small pressure drop, compact structure and easy maintenance [5, 6]. It is widely used in power, petrochemical, ferrous metallurgy, printing and dyeing and other high energy consuming processing industries to improve heat recovery [7–9]. However, due to the adhesion characteristics of the fiber particles and oil droplets contained in the exhaust gas from the setting machine, the conventional narrow channel plate heat exchanger is easy to be blocked.