Experience Gained on Direct Use of Low Enthalpy Energy in Hotel do Parque, S. Pedro do Sul, Portugal

World Multidisciplinary Earth Sciences Symposium 2017

Gomes, L. M. Ferreira^1,4 ; Trota, A.P. Neves^2,4 ; De Albuquerque, F. J. Reis Afonso^3

University of Beira Interior, Department of Civil Eng. and Architecture, Covilha

6201-001, Portugal^1

University of the Acores, Department of Geosciences, Ponta Delgada

9501-801, Portugal^2

Municipality of Sao Pedro Do sul, Concessionary of S. Pedro Do sul Medical Spa, Largo de Camoes, Sao Pedro do Sul

3660-436, Portugal^3

GEOBIOTEC, University of Aveiro, Campus Universitário de Santiago, Aveiro

3810-193, Portugal^4

关键词: District heating system;    Local expansion;    Mineralized water;    Plate heat exchangers;    Renewable energies;    Thermal power plants;    Water flow rate;    Water temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/2/022017/pdf
DOI  :  10.1088/1755-1315/95/2/022017

来源: IOP

【 摘 要 】

Despite the high number of thermal flowing springs in Portugal mainland (up to 52 hot springs), ranging temperatures from 20 °C to 77 °C, and with significant water flow rate, few district heating system were implemented in Portugal. Here we present the Sao Pedro do Sul district heating system, located northern of Portugal. The thermal power plant was designed, completed, and commissioned in 2001 allowing the utilization of the geothermal heat by local users, as Hotel do Parque. The district heating system sums about 15 years of utilization without interruption and with minor drawbacks. On this paper we present the project overview along with thermal power plant specifications and data numbers. Heat comes from a 16.9 L/s of thermal water supplied by a natural spring and a nearby well. Heat from the spring and well sources is transferred to a secondary low mineralized water system by a plate heat exchanger, allowing the heating of space and domestic waters of hotel areas. Based on a theoretically cascade direct use of heat from a 67 °C to a 20 °C water temperature range, available heat totals 29.1∗106kWh yearly. However, past and actual use of heat only reaches around 1.6% of that figure. By comparing with fossil heat sources, actual use of a natural heat source reduces a theoretically amount of 117.9 ton of CO2emissions by year. The successful use of this district heating system can promote local expansion of new users and other possible heat uses of this renewable energy, giving chance for the district heating system saturation.