BIOETHANOL GREENHOUSE GAS CALCULATOR - HGCA

64. Using the CalculatorThe bioethanol GHG calculator is an interactive spreadsheet-based tool for calculatingthe GHG emissions resulting from the production and use of wheat-based bioethanolin the United Kingdom. It uses input data describing the entire production chain forany batch of ethanol to calculate the GHG emissions associated with that batch andcompares the results with those produced from the production and use of anequivalent quantity of petrol. The methodology and factors underlying thecalculations are based on a consensus study carried out by experts from industry andacademia as part of the Low Carbon Vehicles Partnership in 2004 (LCVP, 2004).The tool is provided as a Microsoft Excel workbook. Please note that Macros mustbe enabled for the tool to run.4.1 Data Input PageThe calculator opens to the Data Input Page, shown in Figure 1. The bioethanolproduction chain is specified on this page by entering data and making selections thatdescribe the inputs, outputs and other features of the different sections of the chain.The use can make appropriate selections and entries as instructed on the page orsimply leave the existing default values. Further clarification can be obtained bypressing the “HELP” button.For each section of the ethanol production chain, standard default values can be reenteredby clicking on the "Set Default Values" button. These default values are basedon a typical production chain producing 100 000 tonnes of ethanol per annum, asanalysed in the Low Carbon Vehicles Partnership study by Rickeard et al (LCVP,2004).The functions and input data requirements of the different sections of the Data InputPage are described below.