Presentation Title Date xx, 2004

1
Polytechnic University of Valencia CAMPUS DEMO
SYSTEM, SPAIN Prof. José Miguel Corberán
Salvador PhD. Carla Montagud UNIVERSITAT
POLITÈCNICA DE VALÈNCIA
Building and Use
Heating Cooling System
Heat Pump
building photo
photo 1
The already existing heat pump from the Geo-Cool
EU project was replaced by a new one manufactured
by HIREF, model GSH212SX, designed specifically
for the GROUND-MED project. It consists of a
reversible water to water heat pump which works
with R410A. It is reversible on both the
refrigerant and the secondary fluid (water)
sides. It comprises two brazed plate heat
exchangers and two Copeland compressors working
in tandem in order to be able to adapt the heat
pump capacity to the building energy
demand. Water temperature conditions User Side
Water Temperatures (Chiller) IN/OUT C 15/10
User Side Water Temperatures (Heat Pump)
IN/OUT C 35 / 40 Source Side Water
Temperatures (Chiller) IN/OUT C 26 / 32
Source Side Water Temperatures (Heat Pump)
IN/OUT C 15/10 Heat pump operating
parameters Chiller Cooling Capacity _at_ 15/10C
32/26C kW 17,2 Compressor Absorbed
Power kW 2,8 Compressor Absorbed Current
A 6,3 EER - 6,1 User side
water-flow l/h 2.958 User side pressure
drops kPa 14 Source side water-flow l/h
2.847 Source side pressure drops kPa 12
Heat-Pump Heating Capacity _at_ 35/40C
15/10C kW 19,2 Compressor Absorbed
Power kW 3,6 Compressor Absorbed Current
A 7,2 COP - 5,3 User side
water-flow l/h 3.302 User side pressure
drops kPa 15 Source side water-flow l/h
2.718 Source side pressure drops kPa 12
UPV building (demo site location)
photo 2
Energy Performance
Air conditioned spaces in building The UPV demo
site is located in an institutional building (5J)
at the Polytechnic University of Valencia in
Spain. The building includes corridors, offices,
computer and service rooms and other facilities.
Total area of air-conditioned spaces 250
m2 Aver. annual air temp. 17.3 ºC
Aver. annual  air  rel.  humidity 68
Heat power demand 17 kW Cooling
power demand 15 kW
photo 1
Water temperature evolution (1 operational day,
cooling mode).
Borehole Heat Exchanger (HEX)
Energy performance of Ground-Med heat pump
compared to the Geo-Cool one.
BHE field cross section
Monthly Energy Delivered
Ground Source HEX, single-U tube, HDPE, Ø 25 mm.
6 boreholes in a 2x3 rectangular grid (18 m2) are
connected in a balanced parallel configuration.
Every borehole is back-filled with a different
filling. Borehole depth 50 m Borehole
diameter 150 mm Borehole spacing 3 m
Heat transfer fluid water Soil
Parameters General soil profile gravel
clay Thermal conductivity 2 W/mK Volumetric
heat capacity 3000 kJ/Km3
Monthly loads kWh