Commissioning ground coupled heat pumpoffice building Bayer Diegem

VCB – Hernieuwbare energie voor gebouwen, 2012-09-13 ir. Pedro Pattijn

Agenda

1. Bayer office building project

2. Evaluation� Energyconsumption

� Heat pumps

� Free-cooling

� Bore hole system

� Comfort

3. Primary energysaving & CO2-reduction

4. Conclusions & Proposals

Agenda

1. Bayer office building project

2. Evaluation� Energyconsumption

� Heat pumps

� Free-cooling

� Bore hole system

� Comfort

3. Primary energysaving & CO2-reduction

4. Conclusions & Proposals

Building

Demo-project innovative energytechnologies – VEA

Green Building – European Commission

Belgian Energy Award non-residential buildings 2009

Architect : Reginald SchellenBuilding type: Office buildingDesign : 2007Construction: 2008 – 2009In use : feb 2009Net floor area (NFA): 11.249 m²Conditioned floor area: 7.050 m²

Building

Building

Installation

Geothermal system: borehole heat exchanger(60 probes, length 100m)used for heating and cooling purposes

Backup heating system: gas condensation boilerBackup cooling system: compression chillerDistribution system: TABS, floor ventiloconvectors, ventilationOther systems: Earth-air heat exchanger (EAHX)

(12 tubes, diam. 315 mm, length 55 m)thermal heat recovery wheel

System

System

Source : Geotabs Tetra project

Scheme

Source : Geotabs Tetra project

Metering

Borehole heat exchanger

• 60 bore holes (5 x 12, rectangular)• 100m depth• 4m distance• 50 m³/h

Heat Pump

• HP3 : Lennox HWW 055CS,51 kWth,16 kWel, (COP=3,2)

• Ground : in 6°C out 3°C• Condensor : in 40°C / out 45°C

• HP1&HP2 : Lennox HWW 070CS,70 kWth, 16 kWel, (COP=4,5)

• Ground : in 6°C / out 3°C• Condensor : in 23°C / out 28°C

• Plate heat exchanger free cooling, 170 kW

• Boiler: Viessmann Vitocrossal 300 CT3, 2x383 kW, regime 70/50°C, eff. 109%

• Chiller : Lennox NAC 420D NM1M, 430 kWth, (EER 3,11), R410A,• chilled water 12/7°C• outside air temperature 35°C

Backup

Standard

Agenda

1. Bayer office building project

2. Evaluation / Commissioning� Energyconsumption

� Heat pumps

� Free-cooling

� Bore hole system

� Comfort

3. Primary energysaving & CO2-reduction

4. Conclusions & Proposals

Senter Novem 2007Energy Consumption

BenchmarksIngenium

500 – 10.000m² officesAir conditioned - standard

offices average offices

Specific Gas consumption (kWh/m².year)

70 151 178 100

Specific Electrical consumption (kWh/m².year)

120 85 226 60

Bayer

Year Consumption

Considerations :

� No submetering (gas, heat, cold, electrical)

� High comfort requirements summer & winter

� High occupancy rate

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Gas consumption

Considerations : • Considerable high consumption

at summer : kitchen (sanitary hot water)

• Humidification : steam for AHU

• May / june 2010 :

problem with humidification

Electrical consumption

Considerations : • High consumption : AHU, office equipment, lights, kitchen equipment

• Small consumption: 3 heat pumps, chiller

• Small reduction in monthly electricity consumption (i.e. water pump fountain)

Electrical consumption

Considerations : • Total low electricity consumption HPs

• HP3 : almost no elec. consumption

• HP1 & HP2 : similar profile

• Summer : (almost) no consumption

• More heating power available

Proposals : • Connect HP3 to central heat system

• Change climate control strategy

Temperatures HP

Temp.set point ↓

Energyperformance HP

Ptherm,deliv

(MWh/year)

Ptherm,extract

(MWh/year)

Pelectrical

(MWh/year)

COPyear COPstd.ref.

HP 1+HP2 78 65 17 4,6 4,5

HP3 29 3 26 1,3 3,2

HP 1+ HP2 HP3

Pth,deliv Pth,extract Pel COP Pth,deliv Pth,extract Pel COP

MWh MWh MWh MWh MWh MWh

nov '10 (*) 12,16 10,00 2,16 5,63 2,51 0,44 2,07 1,21

dec '10 25,08 19,03 6,06 4,14 10,69 0,53 10,16 1,05

jan '11 15,65 12,21 3,45 4,54 5,21 0,55 4,67 1,12

febr '11 (*) 15,57 12,12 3,45 4,51 5,67 0,51 5,17 1,10

mrt '11 (*) 8,65 6,79 1,85 4,66 4,16 0,53 3,63 1,14

april '11 0,00 0,99 0,00 0,26

mei '11 0,00 0,00 0,00 0,04

juni '11 0,00 0,00 0,00 0,01

juli '11 0,00 0,00 0,04 0,03 0,01 0,03 1,25

aug '11 0,00 0,00 0,04 0,07 0,04 0,03 2,59

sept '11 0,00 0,00 0,04 0,03 0,00 0,03 1,17

okt '11 0,72 0,54 0,17 4,13 0,19 0,17 0,02

nov '11 1,30 1,04 0,27 4,88 0,44 0,44 0,00

dec '11 5,62 4,12 1,50 3,74 0,39 0,38 0,01

Considerations :• COP HP3 very low!

Proposals :� Check HP3� Connect HP3 on central

heating system

Energyperformance HP

Considerations :• HP1 & HP2 = alternating regime• Pel HP 1 ≈ Pel HP 2• Pth HP 1 > Pth HP 2• COP HP1 = 5 • COP HP2 = 3,5

Proposal : � Check HP2

Free-cooling

Considerations :• Good operation free-cooling• Small or no operation chiller• Temperature diff. (depart/retour)

is rather small• More cooling power available

Proposals :• Change climate control strategy

Energy Balance

Considerations :• +/- good balance• good regeneration• Year over year temperatures / Long term balance

= not enough info yet = to be followed up

Extracted heat : 64,4 MWh

Extracted cold : 63 MWh

Temperature bore holes

Thermal Comfort

Considerations:• Design comfort criteria : 20°C – 25°C = OK

• Optimal comfort zone : 20,5°C – 23,5°C = +/- OK

23,5

20,5

Thermal comfort

Considerations:• Good thermal summer comfort

Proposal :• Increase temp. set.point / dead band temp. control in summer > energy saving

Thermal comfort

Considerations :

• Winter comfort = OK

• Large spread oper.int.temp.(Tmin – Tmax) at similar Tref.ext. (range 0°C-10°C)

• Mid season = risk of overheating

• Control sunshades!

Agenda

1. Bayer office building project

2. Evaluation� Energyconsumption

� Heat pumps

� Free-cooling

� Bore hole system

� Comfort

3. Primary energysaving & CO2-reduction

4. Conclusions & Proposals

Energy/CO2 saving

HPs + bore holes + backup boiler +

backup chiller (Bayer)

std. boilers + std. chillers (Reference)

Electrical consumption MWh e 73 84

Primary electrical consumption GJ p 656 756

Gas consumption GJ p 0 302

Total Primary energy consumption GJ p 656 1.058

Reduction Primary energy GJp

% Saving -

402

38%

Primary Energy Saving

HPs + bore holes + backup boiler +

backup chiller (Bayer)

std. boilers + std. chillers (Reference)

CO2 due to electrical consumption ton 73 84

CO2 due to gas consumption ton 0 17

Total CO2-emission ton 73 101

Reduction CO 2-emission ton% Saving -

CO2-Saving

28

28%

Agenda

1. Bayer office building project

2. Evaluation� Energyconsumption

� Heat pumps

� Free-cooling

� Bore hole system

� Comfort

3. Primary energysaving & CO2-reduction

4. Conclusions & Proposals

Conclusions

Evaluation1. Energyconsumption:

• Gas: medium/low, no submetering

• Electricity: medium/high, heat pumps/chiller ↓

2. Heat pumps• COP HP1 > COP HP2

• COP HP3 very low

3. Free-cooling: • good performance

4. Bore holes : • temperatures depart/retour = OK,

• good energy balance/regeneration

5. Thermal comfort :• Good summer / winter comfort

• Risk of overheating in mid season (sunshades !)

Proposals

• HP 3: • Check performance

• Connect to central heat system

• HP 1 / HP 2:• HP1 = standard / HP 2 = backup

• Check performance HP2

• Indoor climate control :• Increase set.point / dead band zone indoor temperature

within adaptive comfort limits

• Check controlstrategy individual roomcontrol of indoor temperature

(TABS, ventilation, ventiloconvectors)

Towards optimal design and control of geothermal heat pumps

combined with thermally activated building systems in offices

WP1: Project coordination and management

WP2: State-of-the-art review of design methods �design tree

WP3: Inventory of cases � online database

WP4: Monitoring of real GEO-HP-TABS cases

WP5: Model simulations

WP6: System operation and controller development

�MPC implementation

WP7: Comfort survey tool development �www.comfortmeter.eu

WP8: Guidelines for improved design and control �REHVA guidebook

WP9: Dissemination and valorisation

www.geotabs.eu

GeoTabs

� Ingenium nv

� ir. Pedro Pattijn

� Business Unit Manager Energy & Sustainability

� Nieuwe Sint Annadreef 23

� 8200 Brugge

� Tel. 050/40.45.30

� Fax 050/40.45.34

� E-mail: pedro.pattijn@ingenium.be

� Web: www.ingenium.be

Questions?