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Stanford CEE 243 - Lecture Notes

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AHU 1 Cody Wiesen Jordana Viuker 1System Diagram 2BUILDING SYSTEM FLOOR COMPONENT ZONE Y2E2 AHU 1 BASEMENT 1ST FLOOR 2nd FLOOR 3rd FLOOR CV B-1-3 ECV B-12-18 VAV B-1-4 EVAV B-12-14 B12 Teaching Lab B19 Materials Storage B26 Equipment Room B27 Equipment Room ECV 1-12-1 CV 1-1-3 103A Food Service 111 Lecture ECV 2-12-1 CV 2-1-3 220 Men’s Room 293 John Kunz’ Office SF 3-1 ECV 3-12-1 CV 3-1-4 Plenum 318 Men’s Room 324 Open Office LEGEND System served (arrow points away from it) System serving (arrow points to it) 3GREEN LIGHT: System functioning as intended. No attention necessary and no risk of personal or financial harm. YELLOW LIGHT: Data indicate system performance is not as expected. Professional attention advised and possible risk of personal or financial harm. RED LIGHT: Data indicate that either sensors or system not functioning as expected. Professional attention necessary, as there is probable risk of personal or financial harm. Traffic Light Legend NOTE: Colored borders around graphs indicate lowest level of proper system functioning (i.e. if there is any yellow within the data, a yellow border is applied and likewise if there is any red, a red border is applied). 4Hot Water Previous Graph - Colored entirely green - Hard to read - 60 minute interval Revised Graph - Green border - Easier to read - 1 minute interval - More accurate analysis 5Chilled Water Flow Before After Before Further Investigation - Incomplete status assessment - Unsolved yellow lights After Further Investigation - Complete status assessment! - Yellow lights turned green - Insignificant discrepancy 6Before After 1 Before Further Investigation - Neglected areas of concern - Undeserving status assessment After Further Investigation - Exposed area of concern - Discrepancy significant - Complete status assessment! Hot Water Flow 7Heating in Representative Office 371 All Clear - Interval at 1 minute makes an already clear graph even clearer - Heating system in 371 is working perfectly - Status assessment: GREEN! 81 2 2 Before After Before Verification - Unsolved yellow lights - HW turns on too early After Further Investigation - Time series plot refutes problem - Problem in SEEIT: not in the system - Status assessment: Green! HW Flow in Representative Office 371 9Heat Recovery 2009 problem: • Heat recovery cooling mode doesn’t coincide with coil cooling mode 2011 update: • Cooling coil valve no longer open when heat recovery bypass damper is open 10Supply vs. Return Temp. 2009 problem: • Active beam hot water supply & return water temps reversed & values inconsistent with hot water system level temperatures 2011 update: • Hot water supply & return temps have correct relationship; correct system temperature level 11Heating Coil Valve Position 2009 problem: • Heating coil valve cycles open and closed rapidly 2011 update: • Problem fixed 12Wiki Explained • Step 1: Click “Group 3” 13Wiki Explained Cont’d. • Step 2: Use our table of contents to navigate • One continuous page for your convenience 14Recommendations • All inconsistencies marked as “yellow” should be further examined to determine whether they are “red” or “green.” – Hot Water Flow Rate vs. Active Beam Heating Valve Position 15Thank you. Questions?


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Stanford CEE 243 - Lecture Notes

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