M&V Solar Water Heating Guideline - Eskom

Measurement and Verification Standard Guideline for Low Pressure Solar Water Heating Systems v1r1
Figure 18: Complete Installation of a dedicated SWH Data Logger at a RDP House
6.4 Base Line Methodology
As elaborated in Section 3.3. above the LPSWH systems will be treated as Retrofit Projects,
thus the system (electric water heating at the houses) physically exist and can consequently
be measured and monitored before it is altered by the EEDSM project (the installation of
the LPSWHs). Thus, the base line is determined on the basis of hot water usage heated by
ELECTRICITY ONLY i.e. what the grid would “see”.
6.4.1 Base Line Main M&V Question
The main M&V question when dealing with LPSWH projects is to identify the electricity
consumption and its time of use to heat water prior the retrofit. This may be achieved by
the following ways:
By interviews with the inhabitants
By dedicated SWH measurements after the retrofit
By measurements of the electricity prior and after retrofit.
6.4.2 Interviews with the inhabitants
This method provides information on the following activities as summarised in Table 8.
Table 8: Possible Information obtained by interviews by the occupants of the households.
No Information Obtained Remarks
1 Number of people living in the house (their profile:
gender, age, working , unemployed, culture etc.)
29
Often people are giving misleading
and inconsistent information. Also