M&V Solar Water Heating Guideline - Eskom

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Measurement and Verification Standard Guideline for Low Pressure Solar Water Heating Systems v1r1 Figure 21: A Hobo Data Logger installed at a DB in a Low-cost House to determine the base line and energy savings by the retrofit. It should be noted that, the field measurements after the retrofit will be misleading when taken after the installations of the LPSWHs. This is due to the fact that the households could use the electricity for other applications such as : refrigeration, entertainment etc.(in the same manner as in the CFL rollouts) and the fact that some hot water usages has been replaced by the LPSWH. On the other hand people get used to utilize hot water for different applications after the retrofit. 6.4.5 Recommendations for Baseline Procedure The following methodology is recommended as a Standard Guideline for Baseline development for Low Pressure Solar Water Heating Systems: Perform interviews and fill the information as required in Fieldworker Form [6]. A typical form is shown at the worked example shown in Section 10. Identify representative houses in terms of number and profile of occupants and install data loggers (if and where appropriate ) to measure the electricity consumption prior the retrofit. Determine electrical energy and find out the time of its use for water heating, based on the information obtain above . 7 DETERMINATION OF THE SAVINGS 32
Measurement and Verification Standard Guideline for Low Pressure Solar Water Heating Systems v1r1 7.1 M&V RECOMMENDED OPTION Option A [5] [6] is recommended as a Standard Guideline for determination of the savings resulting from implementation Low Pressure Solar Water Heating Systems. Option A recommends Retrofit Isolation: Key Parameter Measurement Savings are determined by field measurement of the key performance parameter(s) which is the current (power) and which define the energy use of the household under consideration. Parameters not selected for field measurement are estimated. These are the inputs to all the engineering calculations based on the interviews leading to determination the amount of electrically heated hot water used by the household. 7.2 MAIN M&V QUESTION FOR DETERMINATION OF THE SAVINGS RESULTING FROM LOW PRESSURE SOLAR WATER HEATING SYSTEMS The Baseline is determined as: energy kWh and power W at its time of use, the amount of hot water in terms of volume (litres) and temperature ( o C). It is more convenient to use as a volume the amount of water mixed (heated water by electricity with cold water). This allow to have a realistic figure for the amount of hot water usage. This is explained in details in the worked example at Section 10 below. The base line should be compared with the thermal output in [kWh] of the Low Pressure Solar Water Heating Systems during the month of consideration. Thus the main M&V question on which the M&V practitioner should report is : “ Can or cannot the LPSWH system offset the energy in kWh which was determined as a baseline”? There are two possible scenarios to report the savings. 7.2.1 Scenario 1: Baseline energy in [kWh] is less or at least equal to the retrofit (LPSWH system) energy output in [kWh] The maximum value of the energy savings that grid would “see” is the value of the baseline as per equation (1) : where: the grid “sees” when ...............(1) - is the energy in [kWh] saved and produced by the LPSWH system and which 33
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M&V Solar Water Heating Guideline - Eskom

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