[Code of Federal Regulations]
[Title 10, Volume 3]
[Revised as of January 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR434.603]

[Page 413]
 
                            TITLE 10--ENERGY
 
                    CHAPTER II--DEPARTMENT OF ENERGY
 
PART 434_ENERGY CODE FOR NEW FEDERAL COMMERCIAL AND MULTI-FAMILY HIGH 
RISE RESIDENTIAL BUILDINGS--Table of Contents
 
            Subpart F_Building Energy Compliance Alternative
 
Sec. 434.603  Determination of the design energy use.

    603.1 The Design Energy Use shall be calculated by modeling the 
Proposed Design using the same methods, assumptions, climate data, and 
simulation tool as were used to establish the Energy Use Budget, but 
with the design features that will be used in the final building design. 
The simulation tool used shall segregate the calculated energy 
consumption by fuel type giving an annual Design Energy Use for each 
fuel. The sum of the Design Energy Uses multiplied by the fuel 
conversion factors in Table 602.2 yields the Design Energy Use for the 
proposed design:
[GRAPHIC] [TIFF OMITTED] TR06OC00.030

    Where f1, f2, * * * fi are the fuel 
conversion factors in Table 602.2.
    603.2 Required Life Cycle Cost Analysis for Fuel Selection.
    603.2.1 Fuel sources selected for the Proposed Design and Prototype 
or Reference buildings shall be determined by considering the energy 
cost and other costs and cost savings that occur during the expected 
economic life of the alternative.
    603.2.2 The designer shall use the procedures set forth in subpart A 
of 10 CFR part 436 to make this determination. The fuel selection life 
cycle cost analysis shall include the following steps:
    603.2.2.1 Determine the feasible alternatives for energy sources of 
the Proposed Design's HVAC systems, service hot water, and process 
loads.
    603.2.2.2 Model the Proposed Design including the alternative HVAC 
and service water systems and conduct an annual energy analysis for each 
fuel source alternative using the simulation tool specified in this 
section. The annual energy analysis shall be computed on a monthly basis 
in conformance with subpart E with the exception that all process loads 
shall be included in the calculation. Separate the output of the 
analysis by fuel type.
    603.2.2.3 Determine the unit price of each fuel using information 
from the utility or other reliable local source. During rapid changes in 
fuel prices it is recommended that an average fuel price for the 
previous twelve months be used in lieu of the current price. Calculate 
the annual energy cost of each energy source alternative in accordance 
with procedures in subpart E for the Design Energy Cost. Estimate the 
initial cost of the HVAC and service water systems and other initial 
costs such as energy distribution lines and service connection fees 
associated with each fuel source alternative. Estimate other costs and 
benefits for each alternative including, but not necessarily limited to, 
annual maintenance and repair, periodic and one time major repairs and 
replacements and salvage of the energy and service water systems. Cost 
estimates shall be prepared using professionally recognized cost 
estimating tools, guides and techniques.
    603.2.2.4 Perform a life cycle cost analysis using the procedure 
specified in subsection 603.2.
    603.2.2.5 Compare the total life cycle cost of each energy source 
alternative. The alternative with the lowest total life cycle cost shall 
be chosen as the energy source for the proposed design.