There
3 Graphs and Two tables below on this page. They may load slowly:
1800 Ft2 4 BEDROOM
There
3 Graphs and Two tables below on this page. They may load slowly:
Space heating was predicted by calculation, as shown is the chart below:
Space heat in this building is provided by zonal electric resistance
and a Heat Recovery Ventilator (HPVAC). The HPVAC (Envirovent™ by
Therma-stor Products Group) consumes electricity for several purposes.
It provides space heating, space cooling, water heating, and ventilation.
It is fairly difficult to monitor exactly how much energy has been used
for each function. Though the building was extensively monitored
by the Washington State Energy Office and the Bonneville Power Administration,
and the attempt was made to collect data that would enable assessment of
the energy apportioned to each function, the data was not fully analyzed
due to lack of funding. Therefore an indirect calculation was made to estimate
the portion of energy used for space heat. Utility bills for the first
year of occupancy were obtained from the Washington Water Power Company™
and plotted against the energy use predicted for space heat:
The graph of that data does indicate the type of fit that would be expected between the two curves.
In addition, measured data do exist for 158 energy efficient homes that were built in Cycle I of the Residential Construction Demonstration Program (RCDP). These houses were designed to meet or exceed the Model Conservation Standards. This residence was designed to exceed these same standards, and constructed in the RCDP Cycle II Program. It was assumed that the percentage of total end use energy used for space heating in this residence would be roughly proportional to that used for space heating in the monitored homes of RCDP Cycle I. Hence, the predicted space heat energy use should be about 33% of the measured total energy use:
Measured total use was obtained from utility billing data. Annual use for the previous 12 months ending November 1989, through October 1990 was collected. The data for these one year periods showed an average annual total energy use of 13,666 Kwh. The average energy cost for these periods was $0.048/Kwh, resulting in an average annual energy bill of $656 for lighting, appliances, water heating, space heating, space cooling, continuous ventilation, and pressure-difference control. Predicted annual space heating energy use was 4504 Kwh/yr. This is 33% of the of the actual average annual use and matches exactly the RCDP average space heating use percent, as shown in the chart below.
Total Measured Annual Energy Use
of the Residence
compared to both
Predicted Annual Space Heat Energy Use of Residence
and
RCDP Measured Space Heat Use %
(average of 158 houses).
If the predicted space heating energy use is indeed correct it amounts to an average of $216/yr.
Electric space heating was provided to this residence in two forms:
