To limit the probability that the energy model calculation method will not address building envelope components covered in the prescriptive path, which could lead to heat transfer through all relevant building envelope components not being accounted for, which could lead to inaccuracy of the model, which could lead to overestimation of the energy used by the reference building or underestimation of the energy used by the proposed building, which could lead to excessive use of energy, which could lead to an unacceptable effect on the environment.
To limit the probability that the energy model calculations will not conform to the energy performance level of the reference building as designed according to the acceptable solution set by the prescriptive path, which could lead to overestimation of the building energy target, which could lead to excessive use of energy, which could lead to an unacceptable effect on the environment.