GHAMA - Assessment of the use of Ground Source Heat Pumps (GSHP) in heating and climatization of the Military Academy (Portugal): Amadora Quartering case study

This Project was focused on the assessment of the feasibility, in a conceptual phase, of a Geothermal Heat Pump (GHP) system to be used to climatize the living space of the dormitory building in the Military Academy (Portugal) - Amadora Quartering, as well as to prepare Domestic Hot Waters (DHW). The building has a capacity for 78 students and a floor area of 839 m2. In the beginning the thermal loads, of the building to be climatize with geothermal energy, were evaluated following the methodology presented in the Regulation of Energy Performance of Housing Buildings (REH) and using the RETScreen software. The amount of energy required for the preparation of DHW was 46.36 MWh/year, being 27.83 MWh/year for space heating and 25.76 MWh/year for space cooling. The peak loads obtained for the heating and cooling seasons were 21.01 kW and 6.37 kW, respectively. The installation of a vertical closed circuit Geothermal Heat Pump system (Vertical GSHP) and an open circuit Groundwater Heat Pump system (GWHP) was evaluated through the RETScreen software. A comparison of the technologies used in the Military Academy - Amadora Quartering: natural gas boiler with COP = 0.68 and the air conditioning system with COP = 3.5, with the GHP system to be installed with an annual efficiency COP = 4, was made. The results obtained showed savings in primary energy consumption of € 4,476 per year. After analysing the two systems, the financial balance obtained for a considered project life of 15 years was obtained for the Vertical GSHP and GWHP systems, respectively: a Net Present Value (NPV) of € 24,117 and € 32,450, an Internal Rate of Return (IRR) of 18% and 34%, and a Return Period (RP) of approximately 5 years and 3 years. With the energy efficiency balance, it was also possible to obtain the savings in annual emissions of 14.1 tons of CO2 to atmosphere. This study had an important demonstrative role in the usability of these technologies in Portuguese military installations. Favourability of the final undertaking will take into account its reliability for other military (or civil) facilities, economic profitability, ease of technical and economic implementation, and environmental or energy independence gains for each site.
Alternative Energy Sources, Energy, Energy Efficiency, Low carbon Energy
Start Date:
End Date:

Coordinator/Local PI


Proponent Institution

Academia Militar, Portugal


CERENA / Instituto Superior Técnico, Portugal

Funding Programme

Ministério da Defesa Nacional

Total Funding
107 835,00 €
CERENA Funding
31 000,00 €

Funding Entities