Susmet2

Continuing from our previous blog, this discussion looks at four options on measurement and verification (M&V) plans: Option A:  Retrofit Isolation Option A applies to a single Energy Conservation Measure (ECM) with the key parameter measured.  Savings are determined by field measurement of the key performance parameter(s), which define the energy use of the ECM.  Non-key parameters are estimated.  For example, an energy-efficient pump/motor upgrade may estimate annual pump operating hours (non-key parameter) and measure the electrical motor power (key parameter). Option B:  Retrofit Isolation Option B applies to a single ECM with all parameters measured.  Savings are determined by […]

Continuing from our previous blog and finalising our discussion on measurement and verification (M&V), with two other M&V issues. Cooling and Heating Degree Days:  As part of the adjustments the regression analysis may also include Cooling Degree days (CDD) and Heating Degree Days (HDD).  CDD are a simplified measure of how much cooling is likely for a building.  CDD may be approximately proportional to the energy used for cooling a building.  In general, daily CDD are the differences between the building balance point and the average outside temperature.   CDD are calculated for each day and then summed over a […]