Single&Identical MultiBoilerEnergy Savings Calculator for boiler replacement projectsCells to be completed by userSpaceValues in cells are automatically calculatedProcessMethod 1 - Seasonal Efficiency of Existing Boiler(s)Method 2 - Efficiency Data at Full & Part LoadStep 1 - Provide Details of Existing BoilerMethod 3 - Boiler Input/OutputMethod 4 - Star Rating LabelManufacturerBuderusModelGE215Gross to net conversion factorsRated Output (kW)50Fuel TypeConversion FactorsFuelLPGYear of manufacture2014Mains Gas0.901Net CVLPG0.921Gross CVAre the boilers primarily used for space or process heating?SpaceOil0.937Conversion Factor0.921Select one of the four methods in the drop down menu and where appropriate fill in the blue cells. Note: Method 1 must be chosen if the boiler(s) are used for process heating. For space heating systems methods 2 to 4 are to be used only if the existing boiler(s) are well maintained and are less than eight years old, otherwise it is recommended that a boiler combustion efficiency test is conducted and that the results of the test are utilised by a competent person e.g. boiler engineer to estimate the seasonal efficiency of the boiler(s).Manufacturers Efficiency Details Method0Gross Efficiency 100%70%Method 2 - Efficiency Data at Full & Part Load(Select from drop down menu)Gross Efficiency 30%78%If the boiler(s) is used for process heating then select Method 1 onlyMethod 1 - Seasonal Efficiency of Existing Boiler(s)Equation 2 from NDHC&VCGuideEnter the gross seasonal efficiency of the existing boiler(s)65%Boiler Input Output MethodGross Boiler Input (100%)100Method 2 - Manufactures Efficiency Data at Full & Part LoadGross Boiler Output (100%)95Efficiency at 100% of load70%Gross Boiler Input (30%)30Efficiency at 30% of load78%Gross Boiler Output (30%)25Are the manufactures efficiency details based on Net or Gross Calorific Value?Gross CVGross Efficiency 100%95%Gross Efficiency 30%83%Method 3 - Boiler Input & OutputStar Label MethodWhat is the boiler input at full load (100%) in kW?100Net EfficiencyYou must enter the seasonal efficiency of the boiler(s) if the heating system is used for process heatingLabel100%30%What is the boiler output at full load (100%) in kW?95-*87%85%78.8%What is the boiler input at part load (30%) in kW?30**90%88%***93%91%What is the boiler output at part load (30%) in kW?25****96%94%Conversion Factor0.921Is the boiler input based on Net or Gross Calorific Value of the fuel?Gross CVGross Efficiency 100%83%Method 4 - Star Rating LabelGross Efficiency 30%81%What is the Star label of the existing boilers?**Existing BoilersSeasonal EfficiencyMethod 1 - Seasonal Efficiency of Existing Boiler(s)65.0%0ErrorEstimated Seasonal Efficiency of Existing Boilers (Gross CV)76.5%0Method 2 - Efficiency Data at Full & Part Load76.5%Blue0Method 3 - Boiler Input/Output85.6%Step 2 - Provide Details of Replacement BoilerMethod 4 - Star Rating Label81.5%Gross to net conversion factors for replacement boilerManufacturerBuderusModelGC266Conversion Factor0.901Rated Output255FuelMains GasGross Efficiency 100%63%Year of manufacture2011Gross Efficiency 30%59%Select one of four methods in the drop down menu and where appropriate fill in the blue cells. Note: Method 1 must be chosen if the boiler(s) are used for process heating.Gross Boiler Input (100%)111Gross Boiler Output (100%)95Method 1 - Seasonal Efficiency of Replacement Boilers(Select from drop down menu)Gross Boiler Input (30%)33Gross Boiler Output (30%)25Method 1 - Seasonal Efficiency of Existing Boiler(s)Gross Efficiency 100%86%Enter the gross seasonal efficiency of the replacement boiler(s)91%Gross Efficiency 30%75%Method 2 - Manufactures Efficiency Data at Full & Part LoadEfficiency at 100% of load70%Star Label MethodEfficiency at 30% of load65%Net EfficiencyLabel100%30%Is the efficiency based on Net or Cross Calorific Value?Net CV-Method 1 - Seasonal Efficiency of Replacement Boilers*89%87%Method 2 - Efficiency Data at Full & Part LoadMethod 3 - Boiler Input & Output**92%90%Method 3 - Boiler Input/Output***95%93%Method 4 - Star Rating LabelWhat is the boiler input at full load (100%) in kW?100****98%96%Conversion Factor0.901What is the boiler output at full load (100%) in kW?95Gross Efficiency 100%88%What is the boiler input at part load (30%) in kW?30Gross Efficiency 30%87%What is the boiler output at part load (30%) in kW?25Existing BoilersSeasonal EfficiencyIs the boiler input based on Net or Gross Calorific Value of the fuel?Net CVMethod 1 - Seasonal Efficiency of Replacement Boilers91.4%BlueMethod 2 - Efficiency Data at Full & Part Load59.4%Method 4 - Star Rating LabelMethod 3 - Boiler Input/Output77.1%Method 4 - Star Rating Label87.0%What is the Star label of the existing boilers?****Estimated Seasonal Efficiency of Existing Boiler (Gross CV)91.4%0Measurement PeriodThe number of days in the measurement period must be between 335 and 395 daysStep 3 - Provide Details of Past Energy Consumption DataTo complete step 3 fill in the requested energy consumption data for a recent 12 month period. The fuel consumption needs to be inputted in kWh. The measurement period must be between 335 & 395 days.Measurement period must be between 01-Jan-2010 and 31-Oct-2011 and the number of days must be between 335 and 395 daysStart1/1/10GreenMeasurement period must be between 01-Jan-2010 and 31-Oct-2011End10/31/11395The number of days in the measurement period must be between 335 and 395 daysName and descriptionWeather AdjustmentDegree Day Correction Base 15.5degCEnter fuel consumption over a recent 12 month period (kWh)660000NamePercent of fossil-thermal benchmark pro-rated to degree daysEnergy to be degree day correctedNon degree day corrected energyDegree day corrected energyDegree Day Annualised Energy ConsumptionEnter the total cost of the fuel over the 12 month period$24,420BelmulletMeasurement period must be between 01-Jan-2010 and 31-Oct-2011 and the number of days must be between 335 and 395 daysNo. of Days312831303130313130313031312831303130313130313031Measurement Period Start DateSunday, August 01, 201000Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10Aug-10Sep-10Oct-10Nov-10Dec-10Jan-11Feb-11Mar-11Apr-11May-11Jun-11Jul-11Aug-11Sep-11Oct-11Nov-11Dec-11Jan-12Measurement Period End DateWednesday, August 31, 20110Deg.Days35031927718215052365355129256384317237231134127115566063118395Days1General Office55%363000297000280943555,386Select building typeCold storage008/1/108/1/103153.005322822High Street Agency0%06600000609,873308/31/118/1/113160.00581813General Retail0%06600000609,873Select closest weather stationDublin Airport04Large non food shop55%363000297000280943555,386Number of degree days over measurement period21525Small food store0%06600000609,8736Large food store55%363000297000280943555,386Birr7Restaurant30%198000462000153241580,153Average Unit Price (/kWh)0.037No. of Days3128313031303131303130313128313031303131303130318Bar, pub or licensed club40%264000396000204322570,246Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10Aug-10Sep-10Oct-10Nov-10Dec-10Jan-11Feb-11Mar-11Apr-11May-11Jun-11Jul-11Aug-11Sep-11Oct-11Nov-11Dec-11Jan-129Hotel45%297000363000229862565,293Results - Estimated Annual Energy SavingsDeg.Days4303673252141776540818018832349238824429515314912766797613310Cultural activities55%363000297000280943555,38611Entertainment Halls55%363000297000280943555,386Estimated Annual Energy Savings (kWh)90813008/1/108/1/103181.0081279312Swimming Pool Centre55%363000297000280943555,386308/31/118/1/113179.007620913Fitness and health centre40%264000396000204322570,246Estimated % Reduction in Annual Fuel Consumption-16.4%014Dry sports & leisure facility55%363000297000280943555,386Number of degree days over measurement period266215Covered carpark0%06600000609,873Estimated Annual Energy Cost Savings3,360016Public buildings with light usage55%363000297000280943555,386Cork Airport17Schools & seasonal public bld55%363000297000280943555,386No. of Days31283130313031313031303131283130313031313031303118University campus55%363000297000280943555,386Disclaimer: This calculation tool can be used to provide indicative results and SEAI cannot be held liable for any losses incurred through its use.Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10Aug-10Sep-10Oct-10Nov-10Dec-10Jan-11Feb-11Mar-11Apr-11May-11Jun-11Jul-11Aug-11Sep-11Oct-11Nov-11Dec-11Jan-1219Clinic55%363000297000280943555,386Deg.Days3883383042111575048557516229942735424327015114911466788814020Hospital - clinical & research55%363000297000280943555,38621Long term residential55%363000297000280943555,38608/1/108/1/103155.0055261622General accommodation55%363000297000280943555,386308/31/118/1/113178.007522823Emergency services55%363000297000280943555,38624Laboratory / operating theatre55%363000297000280943555,386Number of degree days over measurement period244025Station55%363000297000280943555,38626Terminal55%363000297000280943555,386Dublin Airport27Workshop55%363000297000280943555,386No. of Days31283130313031313031303131283130313031313031303128Storage facility70%462000198000357563540,525Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10Aug-10Sep-10Oct-10Nov-10Dec-10Jan-11Feb-11Mar-11Apr-11May-11Jun-11Jul-11Aug-11Sep-11Oct-11Nov-11Dec-11Jan-1229Cold storage55%363000297000280943555,386Deg.Days4283713282351927231738917030948436823930216613012278846512208/1/108/1/103173.00732728308/31/118/1/113184.0081187Number of degree days over measurement period2611Malin HeadNo. of Days312831303130313130313031312831303130313130313031Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10Aug-10Sep-10Oct-10Nov-10Dec-10Jan-11Feb-11Mar-11Apr-11May-11Jun-11Jul-11Aug-11Sep-11Oct-11Nov-11Dec-11Jan-12Deg.Days3403222892061656841546014626135733523126914914112068846812908/1/108/1/103154.00542418308/31/118/1/113184.0081197Number of degree days over measurement period2272.3MullingarNo. of Days312831303130313130313031312831303130313130313031Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10Aug-10Sep-10Oct-10Nov-10Dec-10Jan-11Feb-11Mar-11Apr-11May-11Jun-11Jul-11Aug-11Sep-11Oct-11Nov-11Dec-11Jan-12Deg.Days4353713312121695442789119032451539125729416015313167928114208/1/108/1/103178.00782888308/31/118/1/113192.0089223Number of degree days over measurement period2740Shannon AirportNo. of Days312831303130313130313031312831303130313130313031Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10Aug-10Sep-10Oct-10Nov-10Dec-10Jan-11Feb-11Mar-11Apr-11May-11Jun-11Jul-11Aug-11Sep-11Oct-11Nov-11Dec-11Jan-12Deg.Days405342283176137362143561522944603692272641181169447605410408/1/108/1/103143.00432415308/31/118/1/113160.0058158Number of degree days over measurement period2298Valentia ObservatoryNo. of Days312831303130313130313031312831303130313130313031Jan-10Feb-10Mar-10Apr-10May-10Jun-10Jul-10Aug-10Sep-10Oct-10Nov-10Dec-10Jan-11Feb-11Mar-11Apr-11May-11Jun-11Jul-11Aug-11Sep-11Oct-11Nov-11Dec-11Jan-12Deg.Days32729925616912741283842126244368310203237125111996058509608/1/108/1/103138.00382129308/31/118/1/113158.0056146Number of degree days over measurement period2019DdaysBelmullet2152Birr2662Number of degree days over measurement period2611Cork Airport2440Dublin Airport2611Malin Head2272Mullingar2740Shannon Airport2298Valentia Observatory2019Savings for Space HeatingCold storageAnnualised Energy Consumption555386kWhActual Energy Demand424759kWhAnnualised Energy Consumption of New Boiler464573kWhStandardised number of degree days for the weather year at a base of 15.5degC2021Savings for Process HeatingExisting Seasonal Efficiency76.5%Annual Fuel Consumption609873Annual Heat Demand466431Replacement Seasonal Efficiency91.4%Annual Fuel Consumption of replacement boilers510151Annual Savings99722% Reduction-16.4%

About the calculatorEvaluating energy savings for boiler retrofit or upgrade solutions1 What is this calculation tool for?This calculation tool will enable the user to estimate the annual savings associated with replacing all the existing boilers with high efficiency boilers in a LTHW single or multi boiler system. The calculation tool can only be used for multi boiler installations/systems in which all the existing boilers are identical types and all the replacement boilers are identical types.2 How to use the calculation toolTo be able to use the calculation tool the user will need to input:- the seasonal efficiency of the existing boilers or where appropriate the manufactures efficiency data- the seasonal efficiency of the replacement boilers or where appropriate the manufactures efficiency data- the fuel consumption of the existing boilers over a recent 12 month period- information on location and building type for degree day correction purposes (for space heating systems only)Once the data is inputted to the calculator the annual kWh and cost savings will be calculated.Seasonal Efficiency of Existing BoilersBoiler efficiency, in the simplest terms, represents the difference between energy input and energy output. Over the period of one year the seasonal efficiency of the boiler is equal to the energy output divided by the energy input over a one year period multiplied by 100.Using metered data is the most accurate method of determining the seasonal efficiency of an existing boiler. However very few existing heating systems have sufficient metering to monitor both the fuel supply and the heat output and so in instances where metered data is unavailable the seasonal efficiency needs to be estimated from combustion efficiency test results or from the manufactures boiler efficiency test data. The manufacturers test data was determined for the boilers in their as new condition, over time the efficiency of a boiler will reduce due to wear and tear and therefore it is recommended that if the existing boilers are poorly maintained or are 8 years old or more that combustion efficiency test data be used for estimating the seasonal efficiency of the boiler as, in these instances, using the manufactures data will likely result in an over estimate of the seasonal efficiency. It is the responsibility of the user to ensure that the seasonal efficiency estimate is calculated to a reasonable degree of accuracy and should be calculated by a competent person such as a boiler engineer.It is not necessary for the user to estimate the seasonal efficiency of the boiler where the user intends on using the manufacturers test data for a space heating system. Instead the user can chose to input the manufactures test data into the calculator and the calculator will automatically calculate the seasonal efficiency of the boiler. The procedure utilised by the calculator to calculate the seasonal efficiency of a boiler is based on the procedure described in the Non Domestic Building Services Compliance Guide issued by the Department of Communities and Local Government in the UK. The user can choose to input the manufactures data using three different methods and which method the user chooses depends on the data available to the user. The user can either input the full load and part load efficiency, the input and output of the boiler at full and part load or the user can input the star rating of the boiler. See section 3 for further information on inputting manufactures data.If the boiler is used for process heating then the user must input the seasonal efficiency of the existing boiler whether its derived from metered data, combustion efficiency tests or the manufacturers data.Seasonal Efficiency of the Replacement BoilersIf the boilers are to be used for space heating purposes then the user can input the relevant manufactures data and the calculator will automatically calculate the seasonal efficiency. If the boilers are used for process heating then the user must separately calculate the seasonal efficiency of the replacement boilers and input the efficiency into the calculator.3 Manufacturers test dataThe user can input the manufactures:- full and part load efficiency data, or- input and output data at full and part load, or- star rating dataThe manufactures data should only be inputted to the calculator where the boilers are used for space heating purposes only.Full and Part Load EfficiencyThe full and part load efficiency to be entered into the calculator depends on the type of boiler, the likely operating temperature of the boiler and the available manufacturers test data. All modern boilers sold in the EU are tested according to the following conditions:Type of BoilerFull Load Average boiler water temperature (in C)Part Load Average boiler water temperature (in C)Standard70 50boilersLow temperature7040boilers (*)Gas7030 (**)condensingboilers(*) Including condensing boilers using liquid fuels.(**) Temperature of boiler water-supply.Where:- average temperature of the boiler water: is the average of the water temperatures at the entry and exit of the boiler- full load: 100% of rated output- Part Load: 30% of rated outputIn most cases the manufacturer will also have test data for different flow and return temperatures as well as those in the above table. The data the user will use will depend on the likely flow and return temperatures during operation.The user can enter the full and part load efficiency based on the gross or net calorific value of the fuel. The calculator will automatically convert the net efficiency to gross efficiency if the user inputs the net efficiency.Manufactures Input or Output DataThe boiler input and output data to be entered into the calculator depends on the type of boiler, the likely operating temperature of the boiler and the available manufacturers test data. All modern boilers sold in the EU are tested according to the following conditions:Type of BoilerFull Load Average boiler water temperature (in C)Part Load Average boiler water temperature (in C)Standard70 50boilersLow temperature7040boilers (*)Gas7030 (**)condensingboilers(*) Including condensing boilers using liquid fuels.(**) Temperature of boiler water-supply.Where:- average temperature of the boiler water: is the average of the water temperatures at the entry and exit of the boiler- full load: 100% of rated output- Part Load: 30% of rated outputIn most cases the manufacturer will also have test data for different flow and return temperatures as well as those in the above table. The data the user will use will depend on the likely flow and return temperatures during operation.The user can enter the boiler input and output data based on the gross or net calorific value of the fuel. The calculator will automatically convert the input data from net to gross if the net value is entered.Star RatingSome boilers manufactured from 1998 or later have a star rating on the boiler name plate. If a boiler has a star rating then the calculation tool can be used to estimate the seasonal efficiency of a boiler based on the star rating however it is more preferable to use the efficiency or input and output data at full and part load which will result in a more accurate estimate of the seasonal efficiency. The following table shows the efficiency of the various star labels:Take for example a boiler that has an output of 235kW and according to the name plate the boiler is a 2 star boiler (indicated by the number of stars on the name plate). Therefore the efficiency of the boiler at full and part load is calculated as follows:Efficiency at full load (100%) = 87 + 2log(235) = 91.7% (Net Calorific Value)Efficiency at part load (30%) = 83 + 3log(235) = 90.1% (Net Calorific Value)The user will simply select the star rating and enter the rated output of the boiler. The calculator will then automatically calculate the seasonal efficiency of the boiler(s).4 Calculation methodologyThe calculator estimates savings by subtracting the annual fuel consumption for the heating system from the estimated annual fuel consumption post the installation of the replacement boilers. The tool requires the user to enter the fuel consumption for the heating system over a recent 12 month period (365 days 30 days) and also requires that the user inputs the start and end date of the measurement period. For a process heating system the annual fuel consumption is then calculated as follows:Annual fuel consumption = (fuel consumption during measurement period / number of days in the measurement period) x 365If the heating system is used for space heating the user must identify the nearest weather station and the building type. The calculator then assumes that a percentage of the fuel is used for heating hot water based on the building type while the remainder is assumed to be used for space heating. Annual fuel consumption is then calculated as follows:Annual fuel consumption = {(fuel consumption during measurement period * % space heating / number of degree days during measurement period) X 2021*} + {(fuel consumption during measurement period X % hot water heating / number of days in the measurement period) x 365}* The weather year is standardised at 2021 degree days per year, to the base 15.5CTo calculate the annual fuel consumption post the installation of the replacement boilers the calculator estimates the existing heat demand by simply multiplying the existing annual fuel consumption by the existing boiler seasonal efficiency. The annual fuel consumption post the installation of the replacement boilers is then estimated by dividing the heat demand by the seasonal efficiency of the replacement boilers. As an example, if the annual fuel consumption is 100,000kWh, the existing seasonal efficiency is 75% and the seasonal efficiency post the installation of the replacement boilers is estimated to be 91% then the annual savings is calculated by the calculator as follows:Savings = 100,000 - (100,000*0.75)/0.91 = 15,582kWh.Net & Gross Calorific ValueThe net calorific value of a fuel excludes the latent heat of water vapour in the exhaust and so is lower that the gross calorific value. Efficiency test results and European standards normally use net calorific values. If the user inputs data based on the net calorific value of the fuel the calculator converts to gross values using the following net to gross conversion factors:FuelConversion FactorLPG0.921Oil0.937Natural Gas0.901% Fuel Utilised for Space HeatingThe % of fuel assumed to be used for space heating purposes is based on the building type. The following table shows the percentage fuel assumed to be used for space heating purposes for each building type:Building TypePercent of fuel pro-rated to degree daysGeneral office55%High street agency0%General retail0%Large non-food shop55%Small food store0%Large food store55%Restaurant30%Bar, pub or licensed club40%Hotel45%Cultural activities55%Entertainment halls55%Swimming pool centre55%Fitness and health centre40%Dry sports & leisure facility55%Covered car park0%Public buildings with light usage55%Schools & seasonal public bld55%University campus55%Clinic55%Hospital -clinical & research55%Long term residential55%General accommodation55%Emergency services55%Laboratory / operating theatre55%Station55%Terminal55%Workshop55%Storage facility70%Cold storage55%As an example, a clinic that consumes 100,000KWh over the measurement period is assumed to consume 55,000kWh for space heating purposes whilst the remaining 45,000kWh is assumed to be consumed for hot water heating.