An Economic model for passive solar designs in commercial environments

Powell, Jeanne W.

doi:10.6028/nbs.bss.125

Cited by 3 publications

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“…With F-Chart 3.0, upon selection of either method, the prices of fuels used in the auxiliary and reference equipment must be adjusted for their annual operating efficiencies by dividing the base year prices (per 10^Btu) by the operating efficiencies (expressed as a decimal fraction). * For a more extensive discussion of this issue, see reference [15]. The RSVP/2 and PACE programs include comprehensive analyses of the effects of solar energy systems on the market value of commercial properties [12].…”

Section: )mentioning

confidence: 99%

Comparative analysis of economic models in selected solar energy computer programs

Powell¹,

Barnes²

1982

Self Cite

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A variety of computer simulation programs exist for the design and study of thermal performance and economic feasibility of solar domestic hot water and space heating systems. Several studies have indicated that the thermal performance algorithms contained in the different programs produce similar results. However, little comparative analysis has been done of the economic algorithms in these programs. This report compares the economic evaluation models in five computer programs widely used for analyzing solar energy systems: F-CHART 3.0, F-CHART 4.0, SOLCOST, BLAST, and DOE-2. Differences in analysis techniques and assumptions among the programs are assessed for their consistency with the federal requirements for life-cycle costing (10 CFR Part 436), effect on predicted economic performance and optimal system size, ease of use, and general applicability to diverse system types and building types. The FEDSOL program developed by the National Bureau of Standards specifically to meet the federal life-cycle cost requirements serves as a basis for the comparison. Results of the study are illustrated in test cases of two different types of federally owned buildings: a single-family residence and a low-rise office building. The study indicated that none of the programs except FEDSOL fully conformed with the federal requirements for life-cycle cost analysis of renewable energy projects. However, with considerable manipulation of data inputs and simplification of assumptions, they could provide similar predictions for one measure of economic performance, net present value savings.

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Section: )mentioning

confidence: 99%

Comparative analysis of economic models in selected solar energy computer programs

Powell¹,

Barnes²

1982

Self Cite

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“…That is, the annual quantity of non-solar energy (fuel oil) required by this solar auxiliary system (E^) is ! Methods of evaluating non-energy benefits of investments in passive solar energy are treated in reference [10].…”

Section: Estimating Energy Savingsmentioning

confidence: 99%

“…SHW SYSTEMS (TYPES [1][2][3][4][5][6][7][8][9][10][11][12] Earlier versions of the SLR method and the initial version of the FEDSOL program expressed the monthly solar fraction of SHW (service hot water) systems as a function of the monthly SLR. The annual solar fraction was calculated from the results of the twelve monthly calculations.…”

Section: Calculation Of Range Of System Sizes and Solar Fractions Ove...mentioning

confidence: 99%

“…10, D$(10) ,D(10) PRINT " ";U$(10) PRINT" 11 MONTHLY SPACE HEATING LOADS -";U$(11) FOR I -1 TO 6 PRINTUSING 09180,M$(I) ,L(I) ,M$(I+6) ,L(I4$) NEXT I PRINT PRINT "ENVIRONMENTAL DATA" PRINT PRINT " 12 AVERAGE DAILY HORIZONTAL RADIATION -";U$(12) FOR I -1 TO 6 PRINTUSING 09180,M$(I) ,H(I) ,M$(I4«) ,H(I+6) 09180: <##### -####.## <##### -####.## NEXT I 09200PRINT 09210 PRINT " 13 AVERAGE GROUND WATER TEMPERATURES -";U$(13) 09220 PRINTUSING 09260,M$(12) ,M$(2) ,N1 09230 PRINTUSING 09260, M$(3) ,M$(5) ,N2 09240 PRINTUSING 09260, M$(6) ,M$(8) ,N3 09250 PRINTUSING 09260, M$(9) ,M$(11) ,N4 09260: <### -<### -###.# 09270 IF M$ -"Y" THEN 09400 09280 PRINT 09290 PRINT 09300 PRINT " ******************************************* 09310 PRINT " ***************** ENERGY ANALYSIS DATA ***************" 09320 PRINT " ********************************************************** 09330 PRINT 09340 PRINT "DATA FOR ECONOMIC ANALYSIS ONLY" 09350 PRINT 09360FOR I -20 TO 25 09370 PRINTUSING 08970, I,D$(I) ,D(I) 09380 PRINT " ";U$(I) 09390 NEXT I 09400 PRINT 09410 PRINT " ******************************************************** N 09420 PRINT " ***************** LIFE CYCLE COST DATA ***************" 09430 PRINT " ********************************************************** 09440 PRINT 09450 PRINT "BASE YEAR INVESTMENT COSTS" 09460 PRINT 09470 FOR I -30 TO 34 09480 PRINTUSING 08970, I,D$(I) ,D(I) 09490 PRINT " ";U$("FUTURE NON-FUEL COSTS" 09540 PRINT 09550 PRINT "SOLAR ENERGY SYSTEM" 09560 PRINTUSING 08970, 40, D$ (40) ,D(40) 09570 PRINT " ";U$(40) A15 PRINT " 41 REPLACEMENT COST AND YEAR" PRINTUSING 09620, R(l) ,R(2) PRINTUSING09620,R(3) ,R(4)PRINTUSING 09620, R(5) ,R(6) 09620:$###### AT YEAR ## PRINTUSING 08970, 42, D$(42) ,D(42) PRINT " ";U$(42) PRINT PRINT "AUXILIARY SYSTEM" PRINTUSING 08970, 44, D$(44) ,D(44) PRINT " ";U$(44) PRINT " 45 REPLACEMENT COST AND YEAR" PRINTUSING 09620, R(7 ) ,R(8) PRINTUSING 09620, R(9) ,R(10) PRINTUSING 09620, R(ll) ,R(12) PRINTUSING 08970, 46, D$(46) ,D(46) PRINT " ";U$(46) PRINT PRINT "REFERENCE NON-SOLAR SYSTEM" PRINTUSING 08970, 47, D$(47) ,D(47) PRINT " ";U$(47) PRINT "48 REPLACEMENT COST AND YEAR" PRINTUSING 09620, R(13) "R(14) PRINTUSING09620, R(15),R(16) PRINTUSING 09620, R(17) ,R(18) PRINTUSING 08970, 49, D$(49) ,D(49) PRINT " ";U$(49) PRINT PRINT " PRINT "FUEL COSTS" 09880PRINT FOR I » 50 TO 57 PRINTUSING 08970, I, D$(I) ,D(I) PRINT " ";U$(I) NEXTI PRINT PRINT "DOE REGION -";R1 58 ENERGY PRICE ESCALATION (Z PER YEAR ABOVE INFLATION) -PRINT PRINT PRINT "…”

mentioning

confidence: 99%

“…The program will assume these default values unless the user specifies otherwise2 For more detailed economic models providing for in-depth analysis of investments in active and passive solar energy systems for commercial buildings, the reader is directed to references[10, 11, 12,13]; for models that treat solar investments for buildings of State and local governments and non-profit organizations, the reader is directed to references[12,13,14].…”

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Fedsol :

Powell¹,

Rodgers²

1981

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This report provides a user's manual for the FEDSOL computer program and a guide for designing and sizing solar energy projects for Federal buildings. The life-cycle cost procedures implemented by the computer program and explained in the report are consistent with the Federal Rules for Life-Cycle Costing (10 CFR Part 436) as applied to solar energy projects.The FEDSOL program determines the economically optimal size of a solar energy system for a user-specified building, location, system type, and set of economic conditions; it conducts numerous breakeven and sensitivity analyses; and it calculates measures of economic performance as required under the Federal Rules. The economic model in the program is linked with the SLR (Solar Load Ratio) design method developed at Los Alamos National Laboratory to predict the performance of active systems. The economics portion of the program can, however, be used apart from the SLR method, with performance data provided by the user. An environmental data file for 243 U.S. cities is included in the program. Highly user oriented, the FEDSOL program is intended as a design and sizing tool for use by architects, engineers, and facilities managers in developing plans for Federal solar energy projects.

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Accounting for Taxes and Financing

Ruegg¹,

Marshall²

1990

Building Economics: Theory and Practice

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An Economic model for passive solar designs in commercial environments

Cited by 3 publications

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Comparative analysis of economic models in selected solar energy computer programs

Comparative analysis of economic models in selected solar energy computer programs

Fedsol :

Accounting for Taxes and Financing

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