Agenda - 06-05-2001-9e - Laserfiche WebLink

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40 Multi-zone System A multi-zone system is an HVAC system that distributes a constant volume of air to each conditioned space from a central location. Using a water chiller and hot water boiler as the cooling and heating sources, it would simultaneously provide cold and hot air, and. blend this air using mixing dampers to satisfy space temperature conditions. Advantages • Over 20 year median useful life, • Low maintenance costs • Goad control over indoor air quality with outside air ventilation control and high filtration efficiency • Good control aver space temperatures and humidity levels • Quiet operation • Remote access available for control and troubleshooting • Can connect with other centralized digital controls • Systems may be modified to accommodate revised space configurations and usage Disadvanta es • High energy usage due to simultaneous heating and cooling • Relatively high installed cost Packaged Rooftop-Multi-zone A variation on these systems is the installation of packaged rooftop source equipment in a multi-zone configuration. Self-contained DX equipment would replace the water chiller and a gas furnace would replace the boiler as source equipment. The packaged rooftop multi-zone system would have a lower installed cost than the chiller/boiler based system but would have a shorter median useful life of 15 years and a high energy usage and cost. The following is an illustration of a .typical multi-zone system: ~x,~~. N.~.~~ncoon~ sycw„ ApyleNien: GW r~I1~F, lawl pX 2 ap ~ TfPkM GC 7 .., . ,L,. ,. a~~ ~, :': ~. _, ,~. ~~ 7~ ~+ rYo~ ~yq ~p ~~pp AE1 ~npRM~n T N N ~ nw- ~pwiW~ ~ ~~= ~ ~ N R ~rn ~ 6uap~Fm UO FMrpMq AYm~ p I,qr Tw~4walu~ OMR'!bl T~wnu!/ ~ p p~WnF~A~ d RMUn3mak~DwcV ~ p &~~ q j S~sOb OlMeer (40)