Simplified Modeling of Thermal Storage Tank for Distributed Energy Heat Recovery Applications

2015 ◽  
Author(s):  
Aowabin Rahman ◽  
Nelson Fumo ◽  
Amanda D. Smith
Keyword(s):  
Physical Properties ◽  
Storage Tank ◽  
Heat Transfer Fluid ◽  
Design Parameters ◽  
Distributed Energy ◽  
Detailed Model ◽  
Tank System ◽  
Simplified Modeling ◽  
Combined Cooling ◽  
Thermo Physical Properties

A simplified mathematical model was developed to analyze a storage tank containing a stationary fluid with hot and cold heat exchanger coils. The model is to be used as a screening tool for determining tank size and configurations for operation with a given power generation unit in a combined cooling, heating and power (CCHP) system. As such, the model was formulated so that it requires minimal information about the thermo-physical properties of the fluids and design parameters in order to determine the temperature profiles of the stored fluid and the heat transfer fluid for turbulent flow inside the heat exchangers. The presented model is implemented computationally with varying number of nodes, before comparing it with a more detailed model that take into account the variation of thermo-physical properties, as well as the effects of thermal de-stratification and heat loss to the ambient. The simplified model provided accurate temperature predictions that could subsequently be used to design a stratified tank system for a given CCHP application.

scholarly journals Improved Heat Transfer in W-Baffled Air-Heat Exchangers with Upper-Inlet and Lower-Exit

2021 ◽  
Vol 8 (1) ◽  
pp. 1-9
Author(s):  
Mohamed Salmi ◽  
Abdelhakim Boursas ◽  
Mederreg Derradji ◽  
Giulio Lorenzini ◽  
Hijaz Ahmad ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Physical Properties ◽  
Numerical Solution ◽  
Heat Exchangers ◽  
Temperature Gradients ◽  
Heat Transfer Fluid ◽  
Outlet Section ◽  
Volume Method ◽  
Thermo Physical Properties ◽  
Better Than

In the current study, this way was adopted numerically in order to optimize the performance of a HEC through the use of extended solid sections in the form of 'W' (W-baffles: WBs). All limit conditions of the channel have been defined, with all the thermo-physical properties of the HTF (heat transfer fluid) used. The FVM (Finite-Volume-Method) has been adopted with some necessary numerical schemes in order to give the numerical solution, which allows us to visualize dynamically the flow filed and to deduce all the energetic characteristics contained by this HE. Dynamically, the HTF flow velocity at the HEC outlet section reached about 1.812 m/s, in the case of the lowest Re value. While, it passed 4.8 m/s in the case of the largest value of the same variable, i.e. 1.726 to 4.648 times better than the Uin within the limits of Re numbers used. Thermally, areas with very hight TGs (temperature gradients) were observed near the top deflector’s sides, which reflects the effect of the W-baffles. This highlights the importance of the adopted obstacles in changing characteristics of the HEC to the best.

MXene Based Palm Oil Methyl Ester as an Effective Heat Transfer Fluid

2021 ◽  
Vol 68 ◽  
pp. 17-34
Author(s):  
Dieter Rahmadiawan ◽  
Navid Aslfattahi ◽  
N. Nasruddin ◽  
Rahman Saidur ◽  
A. Arifutzzaman ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Methyl Ester ◽  
Physical Properties ◽  
Palm Oil ◽  
Base Fluid ◽  
Heat Transfer Fluid ◽  
Maximum Enhancement ◽  
First Time ◽  
Thermo Physical Properties

In this research, MXene (Ti3C2) nanoflakes are implanted for the first time with Palm oil methyl ester (POME) to improve the nanofluids (POME/MXene) thermo-physical properties. The preparation, characterization, thermal and rheological properties was evaluated. POME/MXene nanofluid was induced with five different concentrations (0.01, 0.03, 0.05, 0.08, and 0.1 wt.%) of MXene to achieve the optimal properties that would be superior for a new heat transfer fluid. It is found that introducing more MXene nanoflakes into POME would expand the thermo-physical properties which will induce the rapid cooling of MXene based-nanofluids. Maximum enhancement of thermal conductivity for a MXene concentration and temperature of 0.1 wt.% and 65 oC respectively was measured to be ~ 176 % compared to the base fluid. Increasing amount of MXene did not effect the viscosity of the nanofluid. These results enable it to be utilized as a promising heat transfer fluid.

Enhanced Sensible Heat Capacity of Molten Salt and Conventional Heat Transfer Fluid Based Nanofluid for Solar Thermal Energy Storage Application

2010 ◽  
Author(s):  
Hyun-eun Kwak ◽  
Donghyun Shin ◽  
Debjyoti Banerjee
Keyword(s):  
Heat Transfer ◽  
Heat Capacity ◽  
Physical Properties ◽  
Molten Salt ◽  
Solar Thermal ◽  
Heat Transfer Fluid ◽  
Solar Thermal Energy ◽  
Silicon Dioxide Nanoparticles ◽  
Operational Capabilities ◽  
Thermo Physical Properties

In concentrating solar power (CSP) systems, the thermo-physical properties of the heat transfer fluid (HTF) are key parameters for enhancing the overall system efficiencies. Molten salts, such as alkali nitrates, chlorides or carbonates, and their eutectics, are considered as alternatives to conventional HTF (such as water or oil) to extend the operational capabilities of CSPS. However, the usage of the molten salt as the HTF is limited, since the heat capacity of the molten salt is relatively lower than that of conventional HTF. Nanofluid is a mixture of a fluid and nanoparticles. Well dispersed nanoparticles can be used to enhance the thermo-physical properties of HTF. In this study, silicon dioxide nanoparticles were dispersed into a molten salt and into a conventional HTF (Therminol VP-1, Solutia Inc). The specific heat enhancement of each nanofluid was studied and the applicability of such nanofluid materials for solar thermal storage applications was explored.

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