shows a trend that SPF1 is higher compared to “average COP” and “SCOPnet”.

Figure 8 The figure shows a trend that SPF1 is higher compared to “average COP” and “SCOPnet”. Field measurements imply a higher uncertainty compared to measurements in a laboratory. The bars of error show an error of ±10% to cover the margins of error.
There are two main differences between “average COP” and “SCOPnet“:  There are differences in degradation for part load operation  Lot 1 does not make an capacity balance of the heating demand of the house at each outdoor temperature.  
The last factor results in that the design capacity, Pdesign, turns out to be larger for the house when using SCOPnet compared to “average COP”. The result show that Pdesign for “average COP” is approximately 13-28% lower compared to “average COP” and SPF is approximately 3-4% lower. The degradation of COP is a little bit tougher when using Lot 1 compared to using prEN14825. The comparison is illustrated in Figure 9 below