Stratified thermal storage systems utilise 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 minimise 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.
KEYWORDS: energy storage, tanks, temperature stratification, calculating, research, computer programs, performance, comparing.
Citation: Symposium, ASHRAE Trans. 1994, Vol.100, Part 1,
Product Details
- Published:
- 1994
- File Size:
- 1 file , 950 KB
- Product Code(s):
- D-17917
