Comparative Life-Cycle Cost Analysis of Underground Heat Distribution Systems

An analytical model was developed to compare the life-cycle costs of two types of underground heat distribution systems: directly buried conduits and concrete trench installations. The costs of initial construction, routine maintenance, operation, repair, and replacement are represented in the model...

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Bibliographic Details
Published in:Journal of transportation engineering 1998-11, Vol.124 (6), p.594-605
Main Authors: Carnahan, James V, Marsh, Charles
Format: Article
Language:English
Subjects:
Applied sciences
Building structure
Building technical equipments
Buildings
Buildings. Public works
Computation methods. Tables. Charts
Construction (buildings and works)
Cost analysis
Engineering
Environmental engineering
Exact sciences and technology
Heating
Miscellaneous
Structural analysis. Stresses
TECHNICAL PAPERS
Underground construction
Underground structure
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Summary:An analytical model was developed to compare the life-cycle costs of two types of underground heat distribution systems: directly buried conduits and concrete trench installations. The costs of initial construction, routine maintenance, operation, repair, and replacement are represented in the model. Comparisons are made to explore the influence of failure rates, heat loss assumptions, the discount rate, and the policy on partial section replacement. Failure rate estimates are obtained from the literature and also from survey results obtained by the U.S. Army. Life-cycle cost computations indicate that, when initial construction costs are the same, concrete trench installations have a cost advantage of $18-$42 per foot over buried steel conduit when other cost components are taken into account over a 25-year lifetime. The cost advantage of concrete trench over fiberglass reinforcement plastic (FRP) buried systems is $32-$133 per foot. The variation in the cost advantage reflects the variation in the estimate of the failure rate for buried steel and FRP systems. Routine maintenance was crucial for the buried systems to avoid dramatic increases in operation and replacement costs that would make the cost advantage of concrete trench installation even greater than stated above. In contrast, the low incidence of failure associated with concrete trench systems made their life-cycle costs relatively insensitive to maintenance policy.
ISSN:0733-947X
1943-5436
DOI:10.1061/(ASCE)0733-947X(1998)124:6(594)