Hotel "Amalia" in Nea Tirintha
Topic of the practice
Ground Source Heat Pumps (GSHP) enable renewable energy use (shallow geothermal energy) for heating and cooling demands of the hotel
Good Practice Information
Hotel Amalia, with a total area of 8,980m2, is located in Nea Tirintha near Nauplio in Peloponese, Greece. The building was totally renovated during the years 2007-2008 and is heated and cooled by an open-loop heat pump system. The heating/cooling distribution system in the building consists of fan-coil units (floor standing type). The building heating and cooling loads are 704 kWh and 566 kWc respectively. The GSHP system consists of two subsaline groundwater supplying wells (60m depth each one) and two reinjection wells (60m depth each one), two titanium heat exchangers and two electric water source heat pumps placed in cascade. The two heat pump units, HP1 (of 352 kWh nominal capacity) and HP2 (of 352 kWh nominal capacity), are both water-to-water type and operate in bivalent mode with electric energy, for heating and cooling purpose as well. Both heat pumps use R407C as refrigerant. At the “ground-source” side of the heat pumps the supply/return temperatures for cooling are 22/26 °C (HP1) and 25/29 °C (HP2). For heating the supply/return temperatures are 12/8 °C (HP1) and 8/4 °C (HP2). The operating points for heating are 40°C and for cooling 7°C.
Evidence of success
After two years of operation (2008-2009) the adopted technological choices in the Hotel Amalia have allowed important energy and economical savings. Compared to a conventional system, the geothermal system offers 70.5% energy saving and 67.4% cost saving. The total cost savings are €105,081. In addition, the total CO2 savings are 323,328 kg CO2. According to the calculations, simple pay-back time is estimated to 4.68 years with a system life-span of 30 years. The expected SPF (heating seasonal performance factor) is 4.54, while the expected SEER (Seasonal energy efficiency ratio, cooling) is 3.65. The results have been positive in all respects: the operating cost, the required maintenance, the total independence from traditional fuels and the operation continuity.
Contact details to obtain further information on the practice
Annex completed on: 03-23-2011