T. Koller[18] [19], M. Zetzsche1, Prof. Dr. Dr. H. Mtiller-Steinhagen1,2

1 University of Stuttgart, Institute for Thermodynamics and Thermal Engineering (ITW)

2 Institute of Technical Thermodynamic (ITT), DLR
http://www. itw. uni-stuttgart. de/~www/ITWHomepage/Forschung/Kaelte. html

Abstract

A small ice store has been designed, constructed and experimentally investigated at the

Institute of Thermodynamics and Thermal Engineering (ITW) of the University of Stuttgart [1]. A simulation program based on EES and Matlab was developed which predicts the experimental data well.

Measurements have shown a higher volumetric capacity (56 kWh/m[20]) than expected from published reports (40 — 44 kWh/m3) [2].The present design offers an efficient solution for cold storage at low cost, and low maintenance and operation efforts.

The chosen type of storage is an ice-on-coil system with external melting. While internal melting would result in higher discharging rates, it is nevertheless not a viable option because of particular requirements on operational mode and design of the present heat exchanger.

The ice store was implemented into the cooling system of the institute building and shows good in-service behaviour. Next steps are further development of the storage design, automation of the operational mode and detailed measurements and evaluation of in-service behaviour.

Keywords: Ice Store, Solar Cooling, Ammonia/Water Chiller, Air-Conditioning

system consisting of absorption chiller, ice storage and solar collector field. This system, which is illustrated in Figure 1, has been taken into operation in spring 2008.