Analysis of Energy Saving Proposals at St. Louis County Jail

摘要: The goal of this project was to evaluate three main proposals, by the Property Management Department (PMD) St. Louis County, which department hoped would reduce energy consumption at their Duluth Jail facility. This particular facility opened in 1995 and houses approximately 170 inmates. Despite its relatively new construction, building produces some highest utility bills all County’s buildings. proposals put forth PMD were following: natural gas using solar water heating for domestic hot water; cooling costs enclosing a light well is currently open sky with transparent, insulated roof; utilize white roof demand during summertime. proposal evaluated determining system could provide annually comparing these energy- monetary savings cost system. Two options evaluated; one 20 collectors another 50. Both systems also included condensing boilers supplementary times low output. annual 20- 50 collector 128 173 MWh, respectively. led payback period 17 years 16 Enclosing well, an area inside perimeter designed give rooms on daylight, performing flow analysis existing condition topped well. involved calculating U-values walls before skyroof then degree days determine heat flows through walls. enclosed balance temperature be used calculate well’s difference between two converted economic period. grades Kalwall-brand insulation “Nanogel” grade mid-range grade. Nanogel-enclosed reduced MWh but increased load 9 while mid-grade decreased 11 4 MWh. These added up net $650 Nanogel $470 skyroof. However, investment so high that periods 450 550 years. roofing considered corresponded newly installed had weathered 3 years, thereby reducing reflectivity. mean monthly temperatures throughout typical year roofs based temperatures. determined roofs’ surfaces considering radiation incident roofs. black colored proposed thencompared into costs. summertime air-conditioning created more wintertime losses therefore caused increases $560 $240 roofs, recommendations implement thermal not other proposals. Other areas might benefit from additional investigations include lighting efficiency improvements, use reductions, replacement either efficient units or wood-pellet/biomass boilers.