22 May 2008

3-YEAR MONITORING RESULTS AND EXPERIENCES WITH AN AQUIFER THERMAL ENERGY STORAGE SYSTEM IN A BELGIAN HOSPITAL


The first aquifer thermal energy storage (ATES) system of Belgium went in
operation in 1998. Until today, besides various small installations, over ten large (> 500 kWt)
ATES systems were installed for different applications. This paper provides an overview of 3-
years monitoring of the ATES system combined with a heat pump in a Belgian hospital. 78%
of the cooling energy was delivered by the ATES system given a primary energy saving of
11,789 GJ comparing to a conventional cooling application. This resulted in a 63% CO2
emission reduction. The implementation of the ATES technology went together with some
unavoidable growing pains. Some of these problems were caused by the unusual
combination of technologies and working parties. Drilling companies get involved in the
process of HVAC installation. Most critical are the connection points between the traditional
and innovative installation part, defined as the boundary zone between the underground and
aboveground installation. As typical example, the communication between the control
systems of the HVAC and the ATES system can be mentioned.