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- The NIST Building Life-cycle Cost Program - version 3.1 (1992)
-
- The NIST Building Life-Cycle Cost (BLCC) computer program provides
- economic analysis of proposed capital investments that are expected
- to reduce long-term operating costs of buildings or building systems.
- It is especially useful for evaluating the costs and benefits of
- energy conservation projects in buildings. Two or more competing
- designs can be evaluated to determine which has the lowest life-cycle
- cost. Or a project can be compared against a "do-nothing" base case
- where no capital improvements are made to reduce future costs.
- Economic measures, including net savings, savings-to-investment ratio
- (SIR), and adjusted internal rate of return (AIRR) can be calculated
- for one alternative relative to the base case or another related
- alternative.
-
- Note: A user's guide to the NIST BLCC program is included with the
- BLCC program, under the filename BLCC.DOC. This should be printed
- and held for future reference. An example of a BLCC analysis is
- provided and all input variables for BLCC are defined in this guide.
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-
-
- BLCC supersedes and incorporates both the Federal Building Life-Cycle
- Cost (FBLCC) and the National Bureau of Standards Life-Cycle Cost
- (NBSLCC) programs. Five kinds of LCC analyses can be performed with
- the BLCC program:
-
- Federal Analysis: Energy Conservation Projects
- Federal Analysis: Project subject to OMB-A94 Guidelines
- Private Sector: Projects with tax analysis
- Private Sector: Owner-occupied houses (limited tax deductions)
- Generic LCC Analysis: public and private sector analyses without
- tax analysis or special LCC guidelines
-
-
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-
- Setup Option
-
- The first time you use BLCC on your computer, you may want to use
- the 'Setup' option to specify the type of monitor you are using, the
- directory or subdirectory where you want to store your BLCC analysis
- files, and the filename of the current DOE energy price files. If
- your monitor is monochrome but 'thinks' it is color, you may have
- trouble reading some menus in the color mode. If this is the case,
- try M or E to see which makes the screen presentation clearer on
- your monitor. The current (Oct 1991) filename of the DOE energy
- price files is ENCOST92. The parameters you enter in the Setup
- option will be saved in file SETUP.FIL in your main BLCC directory
- until they are changed again.
-
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- Conducting a BLCC Analysis
-
- Use the Main BLCC Menu to select each step in a BLCC analysis. First
- create an input data file for each project alternative to be evaluated.
- The input data file contains basic LCC assumptions for the analysis,
- initial costs, operating and maintenance costs, replacement costs,
- energy costs, resale value, and (where relevant) data related to taxes
- and mortgage analysis. The general structure of this input data file
- will be shown below. All input data files have the filename extension
- 'DAT'. Be sure to save the data file before returning to the main menu.
-
- The LCC analysis for a project alternative is automatically performed
- when its input data file is saved. The LCC computations are saved in
- an LCC output file with the filename extension 'LCC'.
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-
- Conducting a BLCC Analysis (continued)
-
- A comprehensive listing of all input data can be generated after the
- input data file is saved by selecting 'Print input data file report'
- from the main menu and designating the file to be used. The input
- data file can be edited and resaved under its old filename or under a
- new filename. Each time it is saved, the LCC is recomputed for that
- file and a new LCC output is generated. The input data file is also
- used to generate the cash flow report for any project alternative.
-
- The LCC output file for each project alternative is needed to print a
- detailed LCC report, to determine which of several project alterna-
- tives has the lowest LCC, and to compute comparative measures of cost
- effectiveness.
-
- All reports can be displayed to the screen, sent to a printer, or
- saved as a DOS text file for later retrieval by word processor.
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-
- Conducting a BLCC Analysis (continued)
-
- Once the LCC analysis has been completed for two or more project
- alternatives, a comparative economic analysis can be performed and
- the lowest LCC alternative can be identified. A comparative analysis
- can be generated for any two alternatives, showing the net savings,
- SIR, and AIRR for the additional capital investment required for the
- alternative with the higher initial cost. The lowest LCC alternative
- among a number (up to 100) of competing alternatives can be
- identified by selecting "Lowest LCC" from the main menu and tagging
- the corresponding LCC output file of each.
-
- If you are comparing a project alternative against a "do nothing"
- base case which has no initial investment but higher future costs
- than the alternative, you must create a project data file for the do
- nothing case and calculate its LCC first.
-
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-
- Getting around in BLCC.
-
- When selecting an option from a list of options, use arrow keys to
- move to your choice, then press <Enter>. If an initial character is
- highlighted, you can press the corresponding character to designate
- your choice. Look for messages at the bottom of the screen keyed to
- the options.
-
- From most screen displays, you can back up to the previous screen by
- pressing <Esc>. From data input screens and this help file, you can
- move backward or forward by pressing <PgUp> or <PgDn>, respectively.
- However, if the cursor is located at a mandatory input variable, you
- must fill in a valid response before moving back to a previous screen.
-
- If you are editing an existing data file you can finish up and save
- your data at any point by pressing F10. Other valid function keys
- are displayed at the bottom of the screen.
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- Generalized data input structure for BLCC:
- Project Data:
- Basic LCC Assumptions
- Tax Related Data (private sector only)
- Capital Investment Data (may be divided into 6 major components):
- Initial Cost Data
- Cost Phasing (if Planning/Construction period specified)
- Depreciation Data (where relevant)
- Annually Recurring Costs
- Non-annually Recurring Costs
- Replacements:
- Timing and Cost
- Depreciation Data (where relevant)
- Energy Cost Data:
- Types, Annual Usage, and Cost
- Escalation Rate Projections
- Energy Use Indexes
- Mortgage Data:
- Temporary Construction Financing (if any)
- Permanent Financing at Occupancy
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-
- BLCC Features not available in FBLCC/NBSLCC
-
- o All program modules are contained in a single executable file.
- o Data files and reports can now be saved to any drive. Use "Setup"
- to specify drive and type of monitor.
- o New cash flow report shows non-discounted cash flows year by year.
- o Up to 100 alternative projects can be compared simultaneously, with
- the least LCC alternative automatically identified. Simply tag
- LCC files and press <Enter>.
- o Only questions relevant to current analysis are displayed on screen.
- o Standard depreciation tables are read from disk to minimize data
- entry. Tables must have extension 'DEP'. See TABLE1.DEP for example.
- o Depreciation variables are now entered separately for replacements.
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-
- More BLCC Features
-
- o Project capital costs can be entered as a single cost or be
- divided into as many as six components.
- o Operating and maintenance (O&M) costs, replacement costs, and depre-
- ciation data are specified separately for each component if capital
- costs are divided into components. (Energy and mortgage costs are
- entered for the overall project and are not component specific.)
- o Price escalation rates for non-annually recurring O&M costs are now
- assumed to be the same as specified for annually-recurring O&M
- costs.
- o Price escalation rates for initial capital assets, O&M, and energy
- prices now must include general inflation if analysis is conducted
- in current dollars.
- o Up to 4 energy types can now be analyzed within a single project
- alternative.
- o Energy usage from year to year can be assumed constant or adjusted
- with yearly energy usage indexes.
-
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-
- Please address technical comments regarding the performance of BLCC
- to:
-
- Steve Petersen
- Office of Applied Economics
- Computing and Applied Mathematics Laboratory
- National Institute for Standards and Technology
- Gaithersburg, MD 20899