Title: +175=737.001_IK001_Brukermanual for Refra varmepumpe.Produktinformasjon.pdf
Effects of Ground Water Ground water movement through the bore hole field can have a large impact on its performance. Ground water recharge (vertical flow) and ground water movement (horizontal flow) can all carry away large amounts of energy. Evaporation can also cool the surface soil and improve horizontal loop performance.Fluid Properties In colder climates, where the supply loop temperature may be less than 4,4ºC, antifreeze will be required. Antifreeze will change the properties of the loop fluid. Adding antifreeze will generally lower the thermal capacity of the fluid and increase the viscosity. The latter will increase pump work. Also, the Reynolds number will decrease and raise the flow rate at which laminar flow begins. To offset these effects, the design flow rate may need to be increased. Most loop design software programs include a range of antifreezes and take into account the change in properties.ParameterCooling CapacityHeating CapacityPressure Drop