Development of a fundamentally based stratified thermal storage tank model for energy analysis calculations

S. P. Gretarsson, C. O. Pedersen, R. K. Strand

Research output: Contribution to journalConference articlepeer-review

Abstract

Stratified thermal storage systems utilize the temperature dependence of water density to store both warm return water and cold supply water in a single tank. Manifolds and diffusers at the tank inlets minimize turbulence and mixing in the tank, resulting in a relatively small thermocline between the hot and cold layers. A discrete time step model based on previous work by Wildin and Truman (1985) was developed for implementation in an hourly energy analysis program. The model numerically solves the one-dimensional, time-dependent equation for the tank water temperatures using a Runge-Kutta method. Appropriate time scaling was required to achieve stability. Sensitivity to model and environmental parameters is discussed. The performance of the model is compared to experimental data and a finite difference model.

Original languageEnglish (US)
Pages (from-to)1213-1220
Number of pages8
JournalASHRAE Transactions
Volume100
Issue number1
StatePublished - Dec 1 1994
Externally publishedYes
EventProceedings of the ASHRAE Winter Meeting - New Orleans, LA, USA
Duration: Jan 23 1994Jan 26 1994

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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