Case study the “GEOCOOL” heat pump system in UPV campus José M. Corberán Instituto de Ingeniería Energética Universidad Politécnica de Valencia Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

GEOCOOL Geothermal Heat Pump for Cooling-and Heating THE FIFTH FRAMEWORK PROGRAMME GEOCOOL Geothermal Heat Pump for Cooling-and Heating along European Coastal Areas Project No: NNE5 – 2001 – 00847, July 2002 Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

GEOCOOL Geothermal Heat Pump for Cooling-and Heating THE FIFTH FRAMEWORK PROGRAMME GEOCOOL Geothermal Heat Pump for Cooling-and Heating along European Coastal Areas UPV UNIVERSIDAD POLITÉCNICA DE VALENCIA Spain GROHOL GROENHOLLAND Holland CIATESA Compañía Industrial de Aplicaciones Térmicas S.A. Spain AUTH Aristotle University of Thessaloniki Greece ENEA Ente per le Nuove Tecnologie, l’Energia e l’Ambiente Italy AEDIE Asociación para la Investigación y la Diagnosis de la Energía Spain Duration: 3 years Feb. 2003 - 2006 Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

GEOCOOL OBJECTIVES To design, construct and demonstrate a GSHP case system in order to produce fair and rigorous data about the: Energy saving potential in comparison to a realistic nowadays alternative system Economic and technical feasibility of GSHP technology in our area Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Ground Source HE main parameters BOREHOLE Configuration: 6 : 2 x 3, rectangle Borehole depth 50 m Borehole spacing 3 m Borehole installation SINGLE-U Borehole diameter 0.14 m U-pipe diameter 0.032 m U-pipe thermal conductivity 0.430 W/m·K(Polyethylene) HEAT CARRIER FLUID: Water HEAT PUMP: IZE70 + R290 (UPV-CIATESA) GROUND(test IN-SITU) Ground thermal conductivity 1.800 W/m·K Volumetric heat capacity 2.4MJ/m3·K Ground surface temperature 18.5 °C Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Hydr. switch Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Ground Source HE Backfilling: sand (course and fine) or sand/bentonite alternative use of spacers Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Ground Source HE Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

GeoCool data acquisition system 44 sensors in the loop (PT100, coriolis mass flowmeters and wattmeters) On site automatic meteorological station w. 22 parameters 1 min sampling during 1 year Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Internal hydraulic group Analysis of data Internal hydraulic group Heat pump system Building Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

GeoCoolizer Instantaneous values Cooling/Heating capacity Absorbed/Transferred capacity from/to the ground Instantaneous COP Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Integrated or averaged values GeoCoolizer Integrated or averaged values Heating and cooling load Total energy absorbed/ transferred from/to the ground - From 7 a.m to 10 p.m - The selected period (one week, all the season…) Electric energy Seasonal Performance Factor (SPF) Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Dynamic behaviour Cooling Mode Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

System performance in heating mode Experimental results System performance in heating mode COP – WW SPF – WW COP – AW SPF - AW SUMMER 3.46 73 % 2.00 Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Total electricity savings Two systems with the same heating load 42 Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Heating mode – Return WT SUMMER Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Energy distribution in heating Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

COP and SPF in cooling mode 4.36 COP – WW SPF – WW COP – AW SPF - AW 60 % 2.72 Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Total electricity savings Two systems with the same cooling load Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Cooling mode - Return WT Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Energy distribution in cooling Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

JANUARY 2005-APRIL 2010

SYSTEM OPTIMIZATION Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

OPTIMUM FLOW RATES: Cooling mode 20% 25% Pump freq. (Hz) Pump freq. (Hz) Both pumps at same speed 40% Pump freq. (Hz) Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

OPTIMUM FLOW RATES: Cooling mode Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

OPTIMUM FLOW RATES: Cooling mode Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

OPTIMUM FLOW RATES: Cooling mode Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

OPTIMUM FLOW RATES: Cooling mode Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

MODELLING WITH TRNSYS Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

TRNSYS MODEL Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

BUILDING THERMAL LOADS: Calculated vs. experiments Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

DAILY TEMPERATURES: Calculated vs. experiments Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán

Conclusions In heating mode, GSHP saves, in terms of primary energy consumption, 41% compared to the air to water roof top system. In cooling mode a 38% saving was obtained. The impact in electricity consumption of the auxiliary elements of the HVAC system was found to be large and should be taken into account to improve overall system efficiency, Capacity adaptation strategies are needed to improve load factor and efficiency of (both) systems. Improved control strategies are being investigated. Seminar: GSHP Systems of High Efficiency – The Ground-Med case study. Madrid, June 23, 2010 José M. Corberán