Orange County NC Website
Browse       Search
35 <br />Northern Building <br />Based upon the existing building construction and intended use, we calculated a maximum <br />cooling load requirement of approximately 110 tons. Like the Whiffed Building, our general <br />HVAC system alternatives considered were the multi-zone and VAV systems. With no <br />natural gas readily available, alternate bailer fuels considered were fuel oil (existing source) <br />and propane. No simple payback was calculated for the Northern Building HVAC system <br />due to the significant differences in median useful life. Our analysis, therefore, is based upon <br />uniform annual cost including initial and energy costs. <br />The results of our analysis of the proposed systems are as follows: <br />System Description Probable Energy Uniform Median , :. <br /> Construction Costs ($) Annual Cost : Useful, <br /> Cost (S) ($),.', System Llfe ' <br /> ' , ears <br />Multi-zone, Air- <br />cooled Chiller and <br />Fuel Oil Boiler $621,700 $37,100 $60 200 20 <br />Multi-zone, Air- <br />cooled Chiller and <br />Pro ane Boiler $613,200 $58,500 $81,300 2p <br />VAV, fiir~ooled <br /> <br />4h71er and Fuel`Cti _ <br /> <br />- _ ~ y ~ <br />A <br />~' <br />~ ~ <br /> <br />'~ <br />' " ~, ,' _ y,~~. <br />! ISy- <br />"~~~ -t '`ky <br />F <br />.:~.BDiler': $603 900 ~3 <br />~ 4 . <br />.$ -100 ~- <br />~ <br />;$0'b ~ , <br />~ ~ ~~~~,~~':~ <br />~0~: <br />VAV, Air-cooled <br />Chiller and Propane <br />Boiler $595,400 $34,800 $57,000 20 <br />PRTU-Multi-zone $521,300 $57,200 $85,300 15 <br />PRTU-VAV $506,200 $33,200 $60,400 15 <br />PTAC $328,140 $26,800 $69,200 6 <br />Window AC 8 6 (window AC) <br />Steam Boiler $464,660 $24,200 $57 700 20 boiler <br />Both the PTAC and Window Units/Steam. Boiler Systems have been added for comparison <br />purposes, however they do not meet Indoor Air Quality standards. <br />Although initial costs could be reduced significantly using packaged rooftop equipment, the <br />longer service life expectancy of the boiler/chiller-based systems make them the more <br />attractive choice on a uniform annual cost basis. <br />We recommend the installation of a new HVAC system generally consisting of a <br />variable air volume HVAC system with terminal reheat, utilizing an air cooled chiller <br />and oil fired boiler based on uniform annual cost. <br />(35) <br />