A Second Law Approach to Characterising Thermally Stratified Hot Water Storage With Application to Solar Water Heaters-Reference-Cited by-同舟云学术

A Second Law Approach to Characterising Thermally Stratified Hot Water Storage With Application to Solar Water Heaters

Published:1999-11-01 Issue:4 Volume:121 Page:194-200
ISSN:0199-6231
Container-title:Journal of Solar Energy Engineering
language:en
Short-container-title:

Author:

Rosengarten G.¹,Morrison G.¹,Behnia M.¹

Affiliation:

1. School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney NSW, 2052, Australia,

Abstract

This paper presents a method of characterising and evaluating the performance of hot water storage systems in terms of their temperature distribution. The change in exergy from the stratified state to the delivery state depends on the stored energy and the stratification. It can thus he used to define the storage efficiency for sensible heat storage devices. A new parameter that isolates the stratification component of the exergy is defined and called the stratification efficiency. The effect of temperature distribution, delivery temperature and tank cross-section on exergy and stratification efficiency is investigated. The advantage that stratification offers over a mixed tank is examined in terms of the storage efficiency and overall solar water heating system performance. Exergy is used to assess the operation of mantle heat exchangers in solar water heating systems and it is shown that exergy and stratification efficiency, as well as energy, should be used to ascertain the performance of such heat exchangers.

Publisher

ASME International

Subject

Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment

Link

http://asmedigitalcollection.asme.org/solarenergyengineering/article-pdf/121/4/194/5652454/194_1.pdf

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