Ground Source Heat Pump with Aquifer Thermal Energy Storage at 'Strawberry Garden'
Topic of the practice
Innovative energy system in an horticulture application (i.e. growing strawberries) - a closed greenhouse using a ground source heat pump (GSHP) system
Good Practice Information
This project regards a greenhouse with a net area of 13500 m2, growing strawberries on gutters. The energy bill of an average greenhouse vegetable grower raised over the past years up to more then 30% of total value of the product. A GSHP system with aquifer thermal energy storage system (ATES) can provide energy efficient heating on one hand, and natural cooling on the other hand. Cooling of greenhouses during summer causes less ventilation need of the greenhouse, called "closed greenhouse". This leads to better environmental circumstances for the product by diminishing diseases and the maintaining of high CO2 rates in the greenhouse (necessary for amelioration of growth). At the end, this leads to higher production rates (up to 20%).
GSHP of 825 kW providing over 90% of greenhouse heating;
Oil fired boiler of 640 kW providing peak heating;
ATES system with 2 wells of 80 m3/h, distance = 120m;
Simple payback ≈ 12 years (on energy savings);
Simple payback ≈ 7 years (on energy savings and production increase)
Evidence of success
The practice is a demonstration project for the greenhouse sector in North-eastern Belgium, an important region for Belgian greenhouse vegetable growers. The project had the support of Flemish Energy Agency (VEA) and the regional vegetable auction (Veiling Hoogstraten). Every year, greenhouse grower population diminishes, specially due to unmanageable energy cost, this project combines energy savings with production efficiency (a double advantage in the strive for a maximal production at minimal cost). The installation reduces primary energy use with 65% , this results in the emission reduction of greenhouse gas with 34%.
Contact details to obtain further information on the practice
Terra Energy nv