Inverse Modeling Toolkit: Numerical Algorithms

In 1994, ASHRAE began developing a guideline for ineaswing retrojit savings (GPC14P). In support o f Guideline-14e ASHME initiated RP-1050 to develop a toolkit for. calculating linear: change-point linear: and n~ultiple-linear inverse building energ3, nzodels. The resulting Inverse Modeling Toolkit (IIMT) can be used aspart ofapr-ocedwe to measure savings. This paper describes the nunlerical algoritknts used tojndgeneral least squares regression, variable-base degreedaj! charzge-point, and combination change-point nzrrltivariable regression models in the IMT, as well as the eqrratlons _ used to estimate the uncertain&ofpredictingenergv use for the purpose of nzeasrrring savings using IMT models.

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