?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F743%2F&rft.title=Assets+acquisition+planning&rft.creator=Correia%2C+Aldina&rft.creator=Sapata%2C+Ana&rft.creator=Henriques%2C+Claudio&rft.creator=Lopes%2C+Isabel+Cristina&rft.creator=Costa+e+Silva%2C+Eliana&rft.creator=Henriques%2C+Fabio&rft.creator=Monteiro%2C+Magda&rft.creator=Pinto%2C+Mariana&rft.creator=Borges+Lopes%2C+Rui&rft.subject=Energy+and+utilities&rft.description=At+the+127th+European+Study+Group+with+Industry+an+energy+sector+com-+pany+proposed+an+industrial+challenge+that+consisted+on+the+asset+acquisi-+tion+planning+for+its+liquefied+petroleum+gas+(LPG)+cylinder+business%2C+one+of+the+most+recent+business+areas+in+the+company.+This+business+area+is+still+in+a+growing+phase+and+to+satisfy+the+market+needs+and+assure+a+sustainable+growth+a+very+tight+control+of+the+main+assets%2C+the+LPG+cylinders%2C+is+of+paramount+importance.+Therefore%2C+a+detailed+planning+of+all+the+as-+sets+acquisition+is+required%2C+taking+into+consideration+several+variables%3A+sales+growth+rate%2C+seasonality%2C+cylinder+rotation+and+corresponding+return+rate+to+the+filling+plant.%0D%0AThe+challenge+was+to+develop+a+model+for+the+assets+acquisition+planning.+In+order+to+tackle+this+challenge%2C+it+was+necessary+to+forecast+the+demand.+For+that+purpose%2C+time+series+techniques+were+used%2C+in+particular%2C+moving+averages+and+exponential+smoothing.+The+results+show+that+the+seasonality+does+not+explain+all+the+variation+of+the+demand%2C+therefore+it+is+necessary+to+use+a+model+that+would+consider+other+possible+explanatory+variables.%0D%0AAccording+to+several+authors%2C+gas+consumption+may+be+influenced+by+several+aspects%2C+such+as%2C+atmospheric+temperatures%2C+heliophany+(a+measure+of+the+day+luminosity)%2C+wind%2C+relative+humidity%2C+rains%2C+minimum+and+maximum+temperatures%2C+demand+in+previous+periods%2C+and+prices.%0D%0AThe+forecast+of+bottled+propane+gas+sales+and+return+rate+was+also+addressed+through+multivariate+linear+regression.+Regression+models+for+the+monthly+number+of+bottles+of+types+A+and+B+were+obtained%2C+having+pre-+sented+good+percentages+of+explained+variability+with+the+variables+under+study.%0D%0AThe+main+goal+of+the+challenge%2C+the+acquisition+plan%2C+was+addressed+u+ing+inventory+models+with+reverse+logistics.+Several+deterministic+approaches+have+been+considered+to+enable+different+aspects+in+the+framework.+A+new+inventory+model+has+been+developed+to+contemplate+the+three+possible+des-+tinations+of+returned+bottles%3A+cleaning%2C+requalification%2C+or+disposal.+The+models+were+implemented+in+Excel+and+can+be+tested%2C+using+PRIO+estimates+of+holding+costs+and+fixed+setup+costs%2C+and+the+forecasts+of+sales+and+return+rate+computed+previously.&rft.date=2017&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F743%2F1%2Fprio_energy_assets-acquisition-planning.pdf&rft.identifier=++Correia%2C+Aldina+and+Sapata%2C+Ana+and+Henriques%2C+Claudio+and+Lopes%2C+Isabel+Cristina+and+Costa+e+Silva%2C+Eliana+and+Henriques%2C+Fabio+and+Monteiro%2C+Magda+and+Pinto%2C+Mariana+and+Borges+Lopes%2C+Rui++(2017)+Assets+acquisition+planning.++%5BStudy+Group+Report%5D+++++