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GROUND-MED PROJECTCOIMBRA DEMO-SITE
André Quintino Duarte
Coimbra, 23 February 2012
Demonstration Building
Total area: 3250m2
Four floors
Two public services installed
Offices, laboratories, conference room
Capacity for 250 permanent workers + 72 temporary people in a conference room
Located close to a river
“Fábrica dos Mirandas”
Demonstration Building
Demonstration Building
• The heated /cooled spaces are located in level 3 of the building (last floor).
• 22 rooms (offices)• Approximately space conditioned area 600 m2
Demonstration Building
Simplified schematics of the hydraulic installation
75 mm Diameter PPR Pipes in the main sections
Borehole Heat Exchanger
DOUBLE U TUBEBorehole diameter (d) 160 mm
Pipe internal diameter (D2) 32 mmPipe external diameter (D1) 35 mm
Shank spacing (s) 56 mm
• Seven vertical boreholes• 125 m deep • 5x5 m rectangular grid• grout material is graded sand (pea size - 3-8 mm )
Geological Profile
Alluvium
Limestone / Sand / Silt
Clay Loam
Earthworks
High Groundwater flowFreatic Groundwater level – 5 metres
Location of the Boreholes
Heat Pump• Reversibility is done on the
water side in order to always be in counter current on the heat exchangers.
• This is achieved by 3-way motorized valves
CondEvap
Piping System
Heat Pump Test Results
Conditions
Cooling modeEvaporator Condenser
Cooling capacity
EEREuroventClass AInlet Outlet Inlet Outlet
EUROVENT 12°C 7°C 30°C 35°C 56 kW 5.05 >= 5.05
Coimbra demo site
15°C 10°C 25°C 30°C 63.5 kW 6.19 n.a.
Conditions
Heating modeEvaporator Condenser
Heating capacity
COPEuroventClass AInlet Outlet Inlet Outlet
EUROVENT 10°C * 40°C 45°C 61 kW 4.58 >= 4.45
Coimbra demo site
15°C ** 35°C 40°C 70.4 kW 5.65 n.a.
The performance of the heat pump prototype was tested at the CIAT Culoz research center.
Heating Capacity – 70.4 kWCooling Capacity – 63.5 kW
Circulation Pumps
High efficiency permanent magnet motor pump supplied by Grundfos, with variable speed control.
FanCoil Units• The Fan Coil units were supplied by CIAT. They are
COADIS 2 fancoil units models 235/22 and 235/33. A total of 33 units were installed – 23 units of model 235/22 and 10 units of model 235/33.
• These fancoil units are equipped with high efficiency impellers and high efficiency permanent magnet motors.
FanCoil Units
FanCoil Units
FanCoil Units• Each fan coil can be individually regulated by means of a
thermostat. Comfort temperature can be selected by the user by means of a wall mounted control and fan speed is controlled automatically by means of a 0-10V control signal.
• The fancoils had to be retrofited with an electronic fan speed limiter, because of the noise generated was unacceptable by the users.
Location of the fancoil units
Thermal Storage• The thermal storage tank is to be located in a room
adjacent to the machinery room. It is planned to have a volume of 3.5m3 (40% water + 60% PCM).
• Research is being conducted with the support of the Fluids Thermal Transfer Group of the Department of Mechanical Engineering on the best design of the tank to ensure optimal heat transfer and to ensure that the storage maximum capacity of the PCM modules is used.
• It was found that the most suitable material would be the S46 salt hydrate from PCM products Ltd (UK)
Preliminary test results
Preliminary test results
Preliminary test results
Preliminary test results
COP = 6,03
Thank you