university of cambridge dept of chemistry – lensfield road energy audit & opportunities
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University of CambridgeDept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Malcolm Tait of KJ Tait Engineers
Introduction
•The Utility Challenge
•M & E Power Consumption
•ICT Power Consumption
•Laboratory Power Consumption
•Opportunities for Energy Reduction
University of CambridgeDept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
•27,000 sq.ft area
•Built in 1950’s
•Mixture of under-graduate and post-graduate research
•Basement to Fifth Floor
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Energy Consumption
Elec
Kwh/m2
Gas
Kwh/m2
Energy Cost p.a
Carbon
Tonnes CO2 p.a
University of Cambridge
371 336 £1.1m 7722
University of Oxford
354 396 - 4264
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Data Gathering;
•Visual Plate Surveys of Motors
•Walkround with Lab Technicians
•Plant Labelling/BMS/
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Fan Power Consumption
No of Fume Motor Power Power Operation
Annual Run Annual
Area Served Cupboards Duty (KW) Standby Setting Run Setting Strategy HoursStandby Hours
Fan 4/1 (Serves 3rd Floor 318, 320 & 321) 5 7.5 6.75 6.75 24+ 7 3120 5616
Fan 4/5(Serves 1st Floor West End lab 122) 12 7.5 6.75 6.75 24+ 7 3120 5616
Fan 4/7 (Ground Floor Serves G13 North Side) 11 7.5 6.75 6.75 Teaching 3120 5616
Fan 4/3 ( Serves 2nd Floor Lab 229 & 231) 3 7.5 6.75 6.75 24+ 7 3120 5616
Ground Floor AHU 4/4 (AHU No4 - htg only) 15 11 13.5 Teaching 3120 5616
First Floor AHU 4/3 (AHU No3 - htg only) 18.5 14.8 16.65 24+ 7 3120 5616
Second Floor AHU 4/2 (AHU No 2 - htg only) 15 9 9 24 + 7 3120 5616
Third Floor (AHU 4/1 (AHU No1)) 15 15 15 24 +7 3120 5616
Fan 4/2 (Serves 3rd Floor ; 316, 317, 318, 323) 5 7.5 6.75 6.75 24 + 7 3120 5616
Fan 4/8 Phase 4 ( Ground Floor serves g13 south side) 11 7.5 6.75 6.75 Teaching 3120 5616
Fan 4/6 Phase 4 ( 1st Floor serves 122, 117a) 8 7.5 6.75 6.75 24 + 7 3120 5616
Fan 4/4 Phase 4 ( 2nd Floor serves 220,222,229) 10 7.5 6.75 6.75 24 + 7 3120 5616
Fan 2/2 Phase 2 ( 3rd Floor serves 301 east end) 12 8.6 7.74 7.74 24 + 7 3120 5616
Fan 2/4 Phase 2 ( 2nd Floor serves 201, 217 & 353a) 8 8.6 7.74 7.74 24 + 7 3120 5616
Fan 1 Phase 1 ( Ground Floor serves G11 east end) 14 8.6 7.74 7.74 24 + 7 3120 5616
Fan 2 Phase 1 ( 1st Floor serves 106 &107) 9 8.6 7.74 7.74 24 + 7 3120 5616
Third Floor AHU 4 ( - htg only 8m3/s) 15 12 13.5 24 + 7 3120 5616
EFG2 (Serves Phase 2/3 Lab 202 & 207) 7 8.6 7.74 7.74 24 + 7 3120 5616
EFG2 (Serves Lab G11 West End) 14 8.6 7.74 7.74 24 + 7 3120 5616
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Fan Energy
•108 m3/s supply air
•328 No fume cupboards
• 3,273,348 kWh p.a
• £283,500 p.a (fan energy)
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Pump Power
Pumps 10/1 & 10/2 140m3/h @13 head 7.5 24 + 7 5736
Served off AHU No 2 Panel - linked to York Chiller 1.5 summer 1440
5 No Pumps each at 1kw, but only 1 running 1 5736
1 No Pump (not running) 1 5736
2 No 11/1 & 11/2 7.5 6 hrs a day 2190
P1 (Running) 5.5 5736
P2 (Running) 5.5 5736
P3 (Running) 5.5 3120
P4 (Running) 5.5 3120
P5 (Not Running) 0 0
P6 North Wing 11 8760
P7 South Wing 11 8760
P8 East Wing 11 8760
P9 ?
Lab 287 0.2 5736
G51 AHU Run around pump 2 5736
0.4 5736
4th Floor Plant Room P1 &P2 3 5736
4th Floor Plant Room P1 &P2 (CHW) 5.5 5736
Motor OperationAnnual Run
Area ServedDuty (KW) Strategy Hours
Dept of Chemistry – Lensfield RoadEnergy Audit & OpportunitiesCooling Plant
York CWP-CHE-1501 72KW Output 32 summer 1440
2 No on Roof Carrier CWP-CHE-002 200 2190
Chiller B cw/ph7/02 25 1440
Chiller C (4TH Floor Plantroom) CH/PH7/01 25 1440
Chiller A (4th Floor Plantroom)CH/PH7/01 25 1440
Total
1527kW Cooling Capcity delivered by 263 No Units
Less ICT Cooling at 200kW = 1327 Kw (CoP OF 3) 442 960
Total M&E Power
Motor OperationAnnual Run
Area ServedDuty (KW) Strategy Hours
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
M&E Plant Electrical Consumption
Dept of Chemistry – Lensfield RoadEnergy Audit & OpportunitiesICT Loads
a
No of Hours of Operation
No of Hours of Operation Total Hours Annual
Plant REF SYSTEMDUTY(kW) run (w) standy (w) run standy
Of Operation p.a. kwh
Machines B95;21 No @ 300W 6.3 8760 55188
B95:Networking Equipment 1.5 8760 13140
Machines B108A 22 8760 192720
Machines B130 30 8760 262800
Machines G34A 59 8760 516840
Machines 152A 5 8760 43800
Machines M25A 13 8760 113880
Machines G34D 18 8760 157680
Machines 373 20 8760 175200
Machines G29 5 8760 43800
Machines UBO2 17 8760 148920
Total 196.8
Cooling Servers
Cooling for Server Rooms (CoP OF 3) 66 8760 578160
PC'S 2118 No PC's in building 80 35 4380 4380 8330.55 1066837
Monitors 2118 No Monitors at 0.004KW 8.4 6570 55188
Printers Large Photocopier (10 No?) 1000 250 4380 4380 54750
Small Photocopier (30No?) 120 30 4380 4380 19710
Laser Printer (140No?) 110 30 4380 4380 85848
Total 3584461
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
HEEPI Input Data
Power of client in active/idle mode (Watts) 79
Power of client in standby mode (Watts) 4
Power of monitor in active/standby mode (Watts) 35
Power of monitor in standby mode (Watts) 2
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Lab Equipment
TotalNo of Hours of Operation
Weeks in Year
Floor Plant REF SYSTEM DUTY(kW) Weekdays Weekends Plant is On
Level 3 Room 302 4 No Fridges
2No Mass Specs 3 phase 1
2 No Oven Heaters 7
Room 301 8 No Glove Boxes
5 No fridges
1 Ni Oven 1
Vacuum Pump for Cupboards 0.5
Room 354 Liquid Chromotogrophy
Vacuum Pump for Cupboards 0.5
fridges 8 No
Level 2 Room 287 Ice maker 1
Freezers 4 No
Misc Items 22 No Items 13A 3
Radio Chemistry 4 No 13A 3
Incubator Shakers 9 No 13A 3 10
Centrafuges 2 No 1 20
Ovens 4 No 2 100 40 50
Dept of Chemistry – Lensfield RoadEnergy Audit & OpportunitiesHEEPI Lab Toolkit Initiative
LEVEL C LARGE HEATING
EQUIPMENTLARGE WET / COLD
EQUIP
Chemical Ovens Cold Room
Glassware Ovens Fridges
Heating Cabinets Freezers
Other Ice Machines
Chillers
SMALL HEATING EQUIP Local DI Water
Heating mantles Water Stills
Hot Plates Glass Washers
Heater / stirrers Ultrasonic Baths
Melting Point Aperatus Other
Water Baths
Rotary Evaporators
Sonicators
Sublimation Aperatus
Heat Gun
Microwave Reactor
Bunsen Burners
Incubators
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Opportunity for Zone Presence Detectors on Fume Cupboards
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Opportunity for Zone Presence Detectors on Fume Cupboards
112 Lab – 9 No fume cupboards- no zps
Melville Lab – 10 No fume cupboards- with zps
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Opportunity for Zone Presence Detectors on Fume Cupboards1 week test, monitoring comparative supply air volumes;
0
500
1000
1500
2000
2500
3000
9.47 9.48 9.49 9.5 9.51 9.52 9.53 9.54 9.55 9.56
Time
Su
pp
ly A
irfl
ow
l/s
Non ZPS
ZPS
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Opportunity for Zone Presence Detectors on Fume Cupboards
Assumptions;
108 m3/s – total supply air into the building328 fume cupboards @ 300l/s – 98m3/s
Best case – install ZPS in all fume cupboards to reduce air volume by 50%
Assume reduce supply fan power consumption by 33% - 454,545 kwh p.a- £39,363.00
Assume heat reduction for 50m3/s p.a; - 3,153,600 kwh p.a- £69,379
Total Potential Saving - £108,742 p.a
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Other Potential Opportunities;
LPHW Pumps at constant volume all year - change AHU’s to 2-port control- potential saving of £12k p.a
Undergraduate labs run in setback modeAll year - - switch off fume cupboards
outwith term, saving of £20k
Review ICT Cooling Strategy
Review Split A/C Strategy
Metering of Laboratory Equipment
Dept of Chemistry – Lensfield RoadEnergy Audit & Opportunities
Other Opportunities
•Record Documentation Collated
•Common Referencing of Plant
•The Need for a Building Log Book – collate design intent
•Improved metering of AHU’s power consumption
•Lab equipment – asset register- meter
Further Energy Saving Opportunities
Adjust exhaust fan speed to reflect current wind conditions;
-Reduce fan speed when wind speed is slow-Increase fan speed when wind speed is fast
Wind Responsive Systems Work Best When;
-low required building flows-high frequency of low wind speeds-directional conditions
Opportunity for Wind Responsive Fume Exhaust Control;
Wind Responsive Fume Exhaust – USA Case Study
Wind Responsive Fume Exhaust – USA Case Study
Wind Responsive Fume Exhaust – USA Case Study
Wind Responsive Fume Exhaust – USA Case Study
Opportunity for Wind Responsive Fume Exhaust Control;
The Process;
•Measure current fume exhaust outlet velocities•Commission wind tunnel simulations for reduced velocities against a range of wind conditions•Undertake physical visualisation tests to validate results •Re-commission fan control strategy
Cost of Process - £60k
Further Energy Saving Opportunities
Opportunity for Wind Responsive Fume Exhaust Control;
Assumption that every fume exhaust fan achieves a 33% reductionIn energy consumption as a result of a wind responsive control regime;
Annual saving in energy – 652027 kwh p.a.Annual cost saving - £56,456.00 p.a
Further Energy Saving Opportunities
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