M&V Solar Water Heating Guideline - Eskom

Measurement and Verification Standard Guideline for Low Pressure Solar Water Heating Systems v1r1
-is the energy in [kWh] prior the retrofit
-is the thermal energy in [kWh] produced by the retrofit (LPSWH system)
In this case there might be excess of energy which is not to be reported as energy savings
resulting from the retrofit , but should reported separately .
7.2.2 Scenario 2: Baseline energy in [kWh] is higher or at least equal to the
retrofit (LPSWH system) energy output in [kWh]
The value of the energy savings that grid would “see” is the value of the retrofit energy
output as per equation (2) :
when ...............(2)
7.2.3 Examples to illustrate the energy savings
Example: Consider a house which has an average monthly base line determined as
2.05 kWh per day. The months under consideration are February and July. The
house is supplied by a Low Pressure Solar Water Heating system which has average
monthly thermal outputs for these months of 4.13 kWh /day and 1.29 kWh/day
respectively. Determine the savings which the grid would “see” for these months.
Solution:
(a) Savings for the month of February
Use the Scenario 1 and apply the equation (1)
ESAVINGS = 2.05 kWh to be reported in the M&V reports. The project performs 100 % .
In addition there will excess of energy not to be reported Eexess = 4.13 – 2.05 = 2.07 kWh
(b) Savings for the month of July
Use the Scenario 2 and apply the equation (2)
ESAVINGS = 1.29 kWh to be reported in the M&V reports
The Project is underperforming by 0.76 kWh ( 0.76= 2.05 – 1.29)
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