M&V Solar Water Heating Guideline - Eskom

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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) 34
Measurement and Verification Standard Guideline for Low Pressure Solar Water Heating Systems v1r1 8 THERMAL PERFORMANCE MODEL OF LOW PRESSURE SOLAR WATER HEATING SYSTEMS As seen in section 6.2. above to quantify the energy savings, the thermal performance of the LPSWH system need to be determined. The model is based on the relevant standards such as SANS 1307 and ISO 9459 [5 ] [7 ]. Note that the model thermal outputs will be seasonal and dependant on the installation location and its accuracy is based on the parameters determined by the SABS test. The model inputs and outputs are shown in Figure 22. Figure 22: Thermal Performance Model An example from the model run for a particular LPSWH system is shown in Figure 23. 35
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M&V Solar Water Heating Guideline - Eskom

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