ASHRAE 90.1 states:

G3.1.3.6 Piping Losses losses shall not be modeled in either the proposed or baseline
building designs for hot water, chilled water, or steam piping.

What about a tank that is inserted in the hot water loop in order to increase the thermal inertia (heat pumps are controlled on the basis of a temperature and if the thermal inertia increases the frequency of the on/off cycles decreases)? Shall I consider the heat losses through the envelope of the tank? Only in the proposed or also in the baseline model?