Patent ID: 11921478
Assignee: CLEAN POWER RESEARCH, L.L.C.
Field: Computer technology (Electrical engineering)
Classification: CPC F  G | IPC F  G

Claim 9:
10. A method according to claim 9, further comprising the steps of:
performing an empirical test over a short duration during which the HVAC system is operated in the absence of solar gain into the building, comprising the steps of:
observing a change in the indoor temperature between the indoor temperature at the start of the empirical test and the indoor temperature at the end of the empirical test;
determining the indoor temperature as the average indoor temperature of the building over the duration;
determining the outdoor temperature as the average outdoor temperature of the building over the duration;
determining the internal electricity consumption as the average internal electricity consumption over the duration;
determining the average occupancy as observed in the building during the duration;
determining the solar resource produced over the duration; and
determining a status of an HVAC system of the building as observed in the building during the duration; and
finding an efficiency of the HVAC system as a function of a thermal mass of the building and the change in the indoor temperature, the thermal conductivity and the temperature difference, the average occupancy, and the average internal electricity consumption, all divided by a rating of the HVAC system and the status of the HVAC system.