Bodemwarmtewisselaarsystemen
Vertical borehole heatexchanger (BHE) wellfields can be used virtually regardless of the geology and groundwater conditions. Allthough thermal properties vary with strata and have their influence on borehole spacing and wellfield geometry, factors such as building energy requirements and heating and cooling cycles are of equal importance when designing heatexchanger systems.
Groenholland exclusively do BHE wellfields and through experience found them to provide efficient and maintenance free longterm service. Well designed, using the right materials and the right implementation, wellfields should have a life span of at least 50 years.
The vertical heatexchanger, the connecting horizontal pipework and the system headers, form the complete groundsource heatexchanger assembly. Circulating through the pipework is the energy transfer medium, usually a water based antifreeze such as monopropylene glycol.
The hydraulic design of the complete BHE wellfield and the viscosity of the circulating medium at the anticipated operating temperatures and specified flow rates determine pump requirements. Pipework diameters, heatexchanger and valve selection, pump types and pumping strategies should be reviewed in detail as pumping energy is a lifetime factor in a BHE wellfield and to a large extent determines the overall efficiency of the heatpump installation
