SIEMENS BUILDING TECH 1 -2003 - Laserfiche WebLink

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Ti - Ti-1= Ctt, Cc= HDDnu,i = CDDBc,i = BH, BC = Ct, C2, C3 = added load) time interval between date Ti and Ti-~ (days) Coefficients for Heating and Cooling Degree-days (Utility units/deg-day) Time history of Heating degree-days (°F-day or °C-day) Time history of Cooling degree-days (°F-day or °C-day) Heating and Cooling degree-day base temperatures (°F-day or °C-day) Coefficients for user variables 1,2,3 (e.g. occupancy/schedule, space utilization, U~,i, U2,~, U3,1 = Coefficients for user variables 1,2,3 Monthly energy savings will be calculated as follows: ES = BL - AU and DS = Dm - Dp where: ES BL AU DBi DS Dp monthly unit energy savings Baseline post retrofit monthly energy usage adjusted demand kW demand savings post retrofit kW demand usage The energy costs avoided will be calculated as follows: CS = ((DS x dr) - Adc) + (( ES x uc) - Aec) + Os where: CS -- ur ---- UC ---- monetary savings The greater of the floor price of demand (as defined above) and the current costs the greater of the floor price of energy (as defined above) and the current costs, calculated as follows: For energy sources the cost of which decreases with increasing usage, the marginal unit cost from the month's bill. For electricity, this marginal cost shall be determined for energy (starting with the amount paid for the last kilowatt-hour purchased including fuel adjustment cost) and demand (amount paid for the last kilowatt purchased I including, if applicable, the effect of demand on the energy cost. For energy sources the cost of which does not decrease with ~ncreasing usage, the average unit cost of all deliveries received during the month. Adc = Actual current year demand costs from utility bill Aec = Actual current year energy cost from utility bill (including taxes and fuel charges). Os = Other related savings attributable to the conservation program. If the Work results in a change of energy source (e.g. conversion from electric to gas heat), or where the level of usage changes enough to affect the marginal cost, or where utilities have changed rate structures, CONTRACTOR shall modify the calculations procedure to appropriately adjust for the change.