Design Journal Entry

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Totaro, Jacob

Journal Entry For

Module 9 - HVAC Systems

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Created

Feb 21, 2024 1:11 AM

Last Edited

Feb 28, 2024 8:03 PM

Created by

Jake

Your Design Journal entries for this module should highlight your design thinking and analysis results that influenced your decisions about:

your overall HVAC system strategy
your heating strategy and how you implemented it in your design
your cooling strategy and how you implemented it
any special HVAC system challenges that you encountered

create overall strategy

heating and cooling on each floor

HVAC air heating and cooling
radiant cooling ceilings

most worried about heat coming in in the heating days so this will help combat the greater surface area in the building

radiant heating floors

zoning:

each level is a zone to increase functionality and optimize heating/cooling
each level has unique sun exposure/function combination

modularity in design

each level has a repetitive plan to lower material, construction, maintenance, and replacement costs and impacts

polished envelope by adding exterior doors
added spaces and tags to rooms
create zones
choosing VAV single duct for all zones
run load report, below:

Determine biggest losses:

Lobby

7% through windows

Foyers

38% through walls
23% through windows

Ex-Ed

15% loss across windows

Office

42% loss through windows

Restaurant

21% loss through windows

Original calculated loads:

Improve window thermal resistance in heating load schematics gives new load report:

can be seen that the total heating/cooling loads decrease from original

Final load report:

Now that we have load report, determine placement/quantifty of air handlers + terminals on each floor based on calculated supply (cooling-dominated loads)

Foyers: 76 to 255 cfm = 1 air terminal in foyers on each level
Restrooms: ~30 cfm = 1 air terminal
lobby: 3206 cfm = requires 7 air terminals, 4000 cfm air handler provided for L1
exhibit/education rooms: 1772 cfm requirement = provide 4 air terminals + 1x2400cfm air handler on ex-ed floors 2-4
office: 721 cfm requirement = 2 air terminals + 1 air handler
restaurant/kitchen: 2100 requirement = 5 air terminals + 1 air handler

max duct size rqd on levels 2-6 = 18x24
level 1 lobby requires 24x24 duct size for the larger load demand

Laid out ducts and temrinals as seen below, before sizing the ducts approproately

sizing

began by changing all direct terminal ducts to the 9x9 size, worked backwards from that point

after sizing:

notes

module 4 in 220A to create views
module 5 planning mechanicl spaces 220B
run design coordination
increase duct sizes to reduce friction
challenges and lessons learned

Design Journal Entry - Module 9