[Equest-users] IU Systems - Chilled Beam DOAS

[Bishop, Bill]

Jonathan,
 
Yes, you can simulate active chilled beams in eQUEST using the induction unit system type. As you note, this method allows energy recovery at the central air handler. See the attached post for my suggestions on handling the outside air. Also, search the archives for "induction" or "valence" for other posts. From your BDL input below, it looks like you're on your way to making it work.
 
Regards,
Bill
 
William Bishop, PE, BEMP, LEED® AP | Pathfinder Engineers & Architects LLP
Mechanical Engineer
 
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
www.pathfinder-ea.com
P Sustainability - less is more.
________________________________

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jonathan Smith
Sent: Thursday, June 17, 2010 4:22 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] IU Systems - Chilled Beam DOAS
 
Hello All:
 
It is my understanding from reading the DOE2.2 Vol.3 Topic Manual that the system type "IU" - induction unit - can be used to simulate an active chilled beam system, without creating a separate eQuest DOA system. How have you or others gone about configuring such a system? I'd appreciate knowing your cautions/recommendations.
 
Other eQuest email threads have indicated that the heat from zone EA/RA streams is not recognized by a DOAS's energy recovery device when using a dual system configuration, DOAS & OA-FROM-SYSTEM. And that an exceptional calculation would be needed to justify such heat recovery. In the interest of capturing exhaust air heat, it seems logical to use the system side parameters for the OA unit and the sub-zone heating/cooling capacities for the chilled beams. What then would be the advantage of creating two systems (DOAS & OA-FROM-SYSTEM)? 
 
Instead of creating a separate eQuest system for a 100% OA system, I am attempting to use the IU system configuration to simulate an active chilled beam system with 100%OA and capture the EA stream heat with an enthalpy wheel component assignment.  Please see the below BDL input and hourly report of the enthalpy wheel heat recovery.
 
Thanks in advance for any recommendations,
 
Jonathan R. Smith AIA LEED®AP
CSArch 
www.csarchpc.com
 
 
BDL input: Typical system /sub-zone 
..
"ERV-1 (IU)" = SYSTEM          
   TYPE             = IU
   HEAT-SOURCE      = HOT-WATER
   BASEBOARD-SOURCE = HOT-WATER
   RETURN-AIR-PATH  = DUCT
   MAX-SUPPLY-T     = 72
   HEAT-SET-T       = 72
   MIN-SUPPLY-T     = 55
   MAX-HUMIDITY     = 55
   ECONO-LIMIT-T    = 65
   ECONO-LOW-LIMIT  = 45
   SUPPLY-FLOW      = 6020
   RETURN-FLOW      = 6020
   MIN-OUTSIDE-AIR  = 1
   MIN-AIR-SCH      = "S1 Sys1 (FC) MinOA Sch"
   OA-CONTROL       = FIXED
   RECOVER-EXHAUST  = YES
   FAN-SCHEDULE     = "S1 Sys1 (FC) Fan Sch"
   SUPPLY-DELTA-T   = 5
   SUPPLY-KW/FLOW   = 0.00186
   RETURN-DELTA-T   = 5
   RETURN-KW/FLOW   = 0.00186
   NIGHT-CYCLE-CTRL = CYCLE-ON-ANY
   RETURN-FAN-LOC   = RELIEF
   INDUCTION-RATIO  = 2.7
   HW-VALVE-TYPE    = TWO-WAY
   HW-LOOP          = "Hot Water Loop"
   CHW-VALVE-TYPE   = TWO-WAY
   CHW-LOOP         = "Chilled Water Loop"
   BBRD-LOOP        = "Hot Water Loop"
   HEATING-CAPACITY = -300000
   EVAP-CL-TYPE     = DIRECT
   DESICCANT        = SOL-VENT-AIR-1
   DESC-HEAT-SOURCE = GAS-HYDRONIC
   ERV-RECOVER-TYPE = ENTHALPY-WHEEL
   ERV-OA-FLOW      = 6020
   ERV-RUN-CTRL     = OA-EXHAUST-DH
   OA-EXHAUST-DH    = 12.313
   ERV-RECOVER-MODE = OA-HEAT/COOL
   ERV-TEMP-CTRL    = FIXED-SETPT
   OA-HEAT-SETPT-T  = 70
   OA-COOL-SETPT-T  = 80
   ERV-CAP-CTRL     = MODULATE-HX
   ..
"EL1 South Perim Zn (G.S7)" = ZONE            
   TYPE             = CONDITIONED
   MIN-FLOW-RATIO   = 1
   HEATING-CAPACITY = -366530
   BASEBOARD-RATING = -100000
   FLOW/AREA        = 0.1
   OA-FLOW/PER      = 9
   DESIGN-HEAT-T    = 72
   HEAT-TEMP-SCH    = "S1 Sys1 (FC) Heat Sch"
   DESIGN-COOL-T    = 75
   COOL-TEMP-SCH    = "S1 Sys1 (FC) Cool Sch"
   BASEBOARD-CTRL   = THERMOSTATIC
   SIZING-OPTION    = ADJUST-LOADS
   SPACE            = "127 Cafeteria"
   ..
 
Hourly Report for Typical IU System:
Month
Day
Hour
Temp of air leaving heat coil - hot deck temp (deg F)
ERV Outdoor air temperature entering HX, after preheat (°F)
ERV Outdoor air temperature leaving HX (to mixed air plenum) (°F)
1
4
9
72
25
58.7408
1
4
10
72
25
59.4445
1
4
11
72
27
59.8008
1
4
12
72
29
60.6705
1
4
13
72
31
61.3672
1
4
14
72
31
61.2842
1
4
15
72
31
61.1658
1
4
16
72
31
61.1586
1
4
17
72
30
60.9037
 
 
 
 
Jonathan R. Smith AIA LEED®AP
 
 

40 Beaver Street
Albany, New York 12207
p: 518.463.8068 x268
f: 518.463.8069 
www.csarchpc.com <http://www.csarchpc.com/> 
 
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