Numerical simulation of three-dimensional flow dynamics in a hot water storage tank

Ievers, Simon, and Lin, Wenxian (2009) Numerical simulation of three-dimensional flow dynamics in a hot water storage tank. Applied Energy, 86 (12). pp. 2604-2614.

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Abstract

A hot water storage device is one of the most common household appliances yet it is also one of the biggest sources of energy consumption. With natural resources fading, it is imperative that typical high energy users such as hot water systems are made as energy efficient as possible. Research has shown that the thermal performance of a hot water system can be increased by maximising the level of thermal stratification within the storage tank, which could lead to huge energy saving. To analyse the effects of tank geometry and operating conditions on the thermal stratification within a storage tank, seven three dimensional models have been numerically simulated by using the computational fluid dynamics program Fluent with realistic boundary and initial conditions applied. The level of thermal stratification in each model has been quantified using exergy analyses. The results show that increasing the tanks height/diameter aspect ratio, decreasing inlet/outlet flow rates and moving the inlet/outlet to the outer extremities of the tank all result in increasing levels of thermal stratification.

Item ID: 5121
Item Type: Article (Refereed Research - C1)
Keywords: numerical simulation; hot water storage tank; exergy; three-dimensional fluid dynamics; thermal stratification
ISSN: 1872-9118
Funders: National Natural Science Foundation of China
Date Deposited: 25 Aug 2009 03:02
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 100%
SEO Codes: 85 ENERGY > 8506 Energy Storage, Distribution and Supply > 850602 Energy Storage (excl. Hydrogen) @ 30%
85 ENERGY > 8506 Energy Storage, Distribution and Supply > 850603 Energy Systems Analysis @ 40%
97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 30%
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