Title: Brukermanual for Refra varmepumpe.pdf
Short Term Effect. The actual load on the loop will affect the fluid supply temperature. For example, if the building were shut down, the fluid temperature would quickly become the ground temperature. However, the loop temperature would be the ground temperature plus the design approach at design load. The actual hourly load also affects the borehole field’s ability to dissipate heat. Therefore, the ground temperature will change with the hourly load. Most loop sizing software group the design day loads into four-hour intervals rather than using all 24 hours. These three effects must be estimated to find the required pipe length. The length may be established by the winter heating load requirement or the summer cooling load requirement. If a winter peaking load establishes the length, the designer should go back and evaluate the cooling performance with the longer length. This will improve the summer performance and may allow smaller heat pumps to be used for some spaces.