The hybrid method applied to the plate-finned tube evaporator geometry

Starace, Giuseppe; Fiorentino, Maria; Meleleo, B.; Risolo, C.

doi:10.1016/j.ijrefrig.2017.12.007

Cited by 29 publications

(9 citation statements)

References 10 publications

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“…The parallel plate heat exchangers are devices designed to provide a large surface area of heat transfer per unit volume [25] in addition to achieving high heat transfer rates between two fluids in a small volume [26,27]. The design of this heat exchanger takes into account the phase change in the organic fluid at low temperatures [28] to select the optimal configurations that guarantee the functional operation of the equipment within the thermal oil circuit.…”

Section: Modeling Of the Plate Heat Exchangermentioning

confidence: 99%

“…where the hydraulic diameter (Dh) is in m, the fluid velocity (v Z1_AT ) is in m/s, the kinematic viscosity (υ Z1_AT ) in m 2 /s, density (ρ Z1_AT ) is in kg/m 3 , the thermal conductivity (k Z1_AT ) is in W/m·K, and the specific heat at constant pressure Cp Z1 AT is in J/kg·K. To calculate the drop pressure at the inlet, and because of the flow within zone 1 for the thermal oil side, Equations (27) to (28) are used, which requires the velocity calculation at the ITC2 input of the thermal oil using Equation (26), where vin Z1_AT is in m/s.…”

Section: Modeling Of the Plate Heat Exchangermentioning

confidence: 99%

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Multiobjective Optimization of a Plate Heat Exchanger in a Waste Heat Recovery Organic Rankine Cycle System for Natural Gas Engines

Valencia

Álvarez

Duarte

2019

Entropy

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A multiobjective optimization of an organic Rankine cycle (ORC) evaporator, operating with toluene as the working fluid, is presented in this paper for waste heat recovery (WHR) from the exhaust gases of a 2 MW Jenbacher JMS 612 GS-N.L. gas internal combustion engine. Indirect evaporation between the exhaust gas and the organic fluid in the parallel plate heat exchanger (ITC2) implied irreversible heat transfer and high investment costs, which were considered as objective functions to be minimized. Energy and exergy balances were applied to the system components, in addition to the phenomenological equations in the ITC2, to calculate global energy indicators, such as the thermal efficiency of the configuration, the heat recovery efficiency, the overall energy conversion efficiency, the absolute increase of engine thermal efficiency, and the reduction of the break-specific fuel consumption of the system, of the system integrated with the gas engine. The results allowed calculation of the plate spacing, plate height, plate width, and chevron angle that minimized the investment cost and entropy generation of the equipment, reaching 22.04 m 2 in the heat transfer area, 693.87 kW in the energy transfer by heat recovery from the exhaust gas, and 41.6% in the overall thermal efficiency of the ORC as a bottoming cycle for the engine. This type of result contributes to the inclusion of this technology in the industrial sector as a consequence of the improvement in thermal efficiency and economic viability.The optimization of equipment used for waste heat recovery (WHR) has been studied by many researchers using different methods and formulations. Technical challenges, such as the high acquisition costs and entropy generation inside the heat exchanger, represent an improvement opportunity to increase ORC performance [4]. In these cases, mathematical tools can be used to find the best solutions through a stochastic search according to the objective selected. Holland [5] and De Jong [6] introduced the concept of genetic algorithms in publications, although these were not applied to the heat transfer field of knowledge.Several researchers have applied optimization techniques to design industrial equipment using thermodynamic and economic approaches, specifically in heat exchangers in the last years. Martin et al.[7] used a dimensionless function proportional to the sum of annual investment costs and operating costs, where the minimum of this function made it possible to determine the optimal Reynolds number, which depends on the type of heat exchanger chosen. In other research, Niclout et al. [8] describe an optimization problem in which objective functions, such as manufacturing cost and heat exchanger volume, as well as operating and manufacturing constraints were studied considering as decision variables the geometric parameters of the fins. To solve this problem, the author developed nonlinear programming of mixed integer numbers, like other options of the solution. Nevertheless, his work is limited by not considering the...

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Section: Modeling Of the Plate Heat Exchangermentioning

confidence: 99%

Section: Modeling Of the Plate Heat Exchangermentioning

confidence: 99%

Multiobjective Optimization of a Plate Heat Exchanger in a Waste Heat Recovery Organic Rankine Cycle System for Natural Gas Engines

Valencia

Álvarez

Duarte

2019

Entropy

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“…The single-bed, single-stage adsorption chiller consists of an evaporator, condenser, valves separating adjacent devices, and at least one sorption bed [19] as shown in Figure 1a. The advances in the design of evaporators and condensers are described in [20,21]. The sorption bed is designed as a hermetic container with a built-in heat exchanger, which transfers heat between the sorbent and the heating/cooling medium (usually water).…”

Section: Design and Operationmentioning

confidence: 99%

Evaluation of Heat Transfer Performance of a Multi-Disc Sorption Bed Dedicated for Adsorption Cooling Technology

Sosnowski

2019

Energies

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The possibility of implementing the innovative multi-disc sorption bed combined with the heat exchanger into the adsorption cooling technology is investigated experimentally and numerically in the paper. The developed in-house sorption model incorporated into the commercial computational fluid dynamics (CFD) code was applied within the analysis. The research allowed to define the design parameters of the proposed type of the sorption bed and correlate them with basic factors influencing the performance of the sorption bed and its dimensions. The designed multi-disc sorption bed is characterized by great scalability and allows to significantly expand the potential installation sites of the adsorption chillers.

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“…This indicates that more effort should be made to improve the heat transfer properties of the evaporator/condenser, and thus further to enhance the performance of the system. Therefore, an optimal design of the heat exchanger for evaporator/condenser [38,39] is necessary to obtain a high efficiency sorption chiller in future.…”

Section: Performance Of the Sorbent Coated Type Sorption Chillermentioning

confidence: 99%

Performance of LiCl Impregnated Mesoporous Material Coating over Corrugated Heat Exchangers in a Solid Sorption Chiller

2018

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The composite material made by impregnating 40 wt. % lithium chloride (LiCl) into the mesopores of a kind of natural porous rock (Wakkanai Siliceous Shale: WSS) micropowders (short for "WSS + 40 wt. % LiCl") had been developed previously, and can be regenerated below 100 • C with a cooling coefficient of performance (COP) of approximately 0.3 when adopted as a sorbent in a sorption cooler. In this study, experiments have been carried out on an intermittent solid sorption chiller with the WSS + 40 wt. % LiCl coating over two aluminum corrugated heat exchangers. Based on the experimental condition (regeneration temperature of 80 • C, condensation temperature of 30 • C in the desorption process; sorption temperature of 30 • C and evaporation temperature of 12 • C in the sorption process), the water sorption amount changes from 20 wt. % to 70 wt. % in one sorption cooling cycle. Moreover, a specific cooling power (SCP) of 86 W/kg, a volumetric specific cooling power (VSCP) of 42 W/dm 3 , and a specific sorption power of 170 W/kg can be achieved with a total sorption and desorption time of 20 min. The obtained cooling COP is approximately 0.16.Energies 2018, 11, 1565 2 of 15 the condenser to release heat. For the opposite process, cooling energy can be obtained in an evaporator because of water evaporation, and the evaporated water vapor binds to the sorbent during the sorption process [15]. Several novel porous solids with water as refrigerant are being researched in sorption heating and cooling systems: silica gel, FAM-01 and FAM-02 developed by Mitsubishi Plastics Ltd. (Tokyo, Japan), metal-organic frameworks (MOFs), and various composite sorbents [16]. Among these sorbents, composite sorbents are considered to be promising to enhance the efficiency of the sorption cooling and heating system by means of a target-oriented design of the sorbent specified for a particular cycle. Composites with two components can offer the opportunity for nano-tailoring the sorption properties by varying the confined salt chemical nature and content, porous structure of host matrix, and synthesis conditions [16,17].Two basic configurations for the composite sorbents-water working pairs were described in the literatures; namely, (1) packed bed sorbent contacting with the heat transfer surface, and (2) sorbent coating on the heat exchanger surface. For the packed bed sorbent cooling systems, Restuccia et al. [6,18] developed an adsorptive cooling system with packed SWS-1L (mesoporous silica gel impregnated with CaCl 2 ) inside a high-efficiency heat exchanger. A mean SCP of 20-40 W/kg of adsorbent and a cooling COP of 0.4-0.6 were obtained when the T re was 95 • C, T con was 35 • C, and T ev was 10 • C. Freni et al. [19] tested the performance of a packed bed sorption chiller using SWS-8L (silica modified by Ca(NO 3 ) 2 ). At the operation condition of T ev = 15 • C, T con = 30 • C, and T re = 90-95 • C, the cooling COP increased from 0.28 to 0.41, while the SCP decreased from 389 W/kg to 190 W/kg when the cycle time changed from 8 min ...

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The hybrid method applied to the plate-finned tube evaporator geometry

Cited by 29 publications

References 10 publications

Multiobjective Optimization of a Plate Heat Exchanger in a Waste Heat Recovery Organic Rankine Cycle System for Natural Gas Engines

Multiobjective Optimization of a Plate Heat Exchanger in a Waste Heat Recovery Organic Rankine Cycle System for Natural Gas Engines

Evaluation of Heat Transfer Performance of a Multi-Disc Sorption Bed Dedicated for Adsorption Cooling Technology

Performance of LiCl Impregnated Mesoporous Material Coating over Corrugated Heat Exchangers in a Solid Sorption Chiller

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