Title: Brukermanual for Refra varmepumpe.pdf
Long Term Effect. This is the change in the ground temperature over many years. If the building has a net heat gain or a net heat loss, the ground temperature will change. The more densely placed the boreholes are, the larger the effect. Ground water moving through the bore hole field can help remove energy and limit the long-term temperature change. For commercial applications, the ground temperature generally climbs. An example of long term effect would be a -14,4° average ground temperature rise over 10 years due to the heat added to the borehole field. The penalty will not be present during the first year, but the heat build up will change the system performance over time.Annual Effect.Over the course of a year, the heat load on a bore field will change and this will affect the ground temperature on a monthly basis. It is this “flywheel” effect that can actually cause the warmest ground loop temperature to occur after the peak load has occurred.