Low Temperature District Heating: An Expert Opinion Survey

Among the available solutions for building heating and cooling, district heating (DH) and district cooling (DC) systems are considered some of the best options since they can ensure a better control of pollutant emissions and greater efficiency than individual systems. Nevertheless, improvements are needed to increase their sustainability and reliability. The so-called “low temperature district heating” (LTDH) concept has been introduced in recent years in an attempt (i) to reduce the distribution heat losses through a temperature decrease in the DH network, (ii) to favor the integration with renewable energy sources, and (iii) to create the conditions required for the development of future smart energy systems. However, many concerns have been raised about its implementation in both existing and new systems. For this reason, this paper aims to identify the stakeholders’ ranking of the barriers against LTDH system development and implementation over the next few years. Aiming to this, a questionnaire was designed, including an analysis of current gaps and strengths, and then submitted to more than 50 Italian and international experts in the field of DH. An in-depth analysis of the received answers was performed, focusing in particular on the Italian experts’ answers. Comments and suggestions on how to promote the transition to the new LTDH approach are reported.

[1]  J. Danielewicz,et al.  Trends of European research and development in district heating technologies , 2017 .

[2]  Marco Pellegriniaa,et al.  Classification through analytic hierarchy process of the barriers in the revamping of traditional district heating networks into low temperature district heating: an Italian case study , 2019 .

[3]  Marco Pellegrini,et al.  The Innovative Concept of Cold District Heating Networks: A Literature Review , 2018 .

[4]  Valentina Bosetti,et al.  Going Electric: Expert Survey on the Future of Battery Technologies for Electric Vehicles , 2013 .

[5]  Thomas Nuytten,et al.  Flexibility of a combined heat and power system with thermal energy storage for district heating , 2013 .

[6]  Fabrizio Cumo,et al.  Expert opinion analysis on renewable hydrogen storage systems potential in Europe , 2016 .

[7]  Brian Vad Mathiesen,et al.  Energy Storage and Smart Energy Systems , 2016 .

[8]  B. McCarl,et al.  Economics , 1870, The Indian medical gazette.

[9]  Stanley Presser,et al.  The Open and Closed Question , 1979 .

[10]  K. Ericsson,et al.  The introduction and expansion of biomass use in Swedish district heating systems , 2016 .

[11]  Steven Beyerlein,et al.  Review of district heating and cooling systems for a sustainable future , 2017 .

[12]  Svend Svendsen,et al.  Evaluations of different domestic hot water preparing methods with ultra-low-temperature district heating , 2016 .

[13]  Sven Werner,et al.  Profitability of sparse district heating , 2008 .

[14]  Miika Rämä,et al.  Introduction of new decentralised renewable heat supply in an existing district heating system , 2018, Energy.

[15]  Marco Pellegrini,et al.  Performance analysis and economic assessment of different photovoltaic technologies based on experimental measurements , 2016 .

[16]  Xuedan Zhang,et al.  A review of heat pump systems for heating and cooling of buildings in China in the last decade , 2015 .

[17]  Jing Liu,et al.  Fault detection and operation optimization in district heating substations based on data mining techniques , 2017 .

[18]  Paul Ekins,et al.  Step changes for decarbonising the energy system: research needs for renewables, energy efficiency and nuclear power , 2004 .

[19]  Svend Svendsen,et al.  Space heating with ultra-low-temperature district heating - a case study of four single-family houses from the 1980s , 2017 .

[20]  Dagnija Blumberga,et al.  Heat Pumps Integration Trends in District Heating Networks of the Baltic States , 2015, ANT/SEIT.

[21]  Ranko Goic,et al.  review of solar photovoltaic technologies , 2011 .

[22]  Changying Zhao,et al.  A review of solar collectors and thermal energy storage in solar thermal applications , 2013 .

[23]  Enrique Rosales-Asensio,et al.  District heating and cogeneration in the EU-28: Current situation, potential and proposed energy strategy for its generalisation , 2016 .

[24]  Tin-Tai Chow,et al.  A Review on Photovoltaic/Thermal Hybrid Solar Technology , 2010, Renewable Energy.

[25]  Darren Robinson,et al.  Energy performance of decentralized solar thermal feed-in to district heating networks , 2017 .

[26]  Martha Brown.  Open-ended Questions , 1994 .

[27]  Rasmus Søgaard Lund,et al.  Mapping of potential heat sources for heat pumps for district heating in Denmark , 2016 .

[28]  Gabriele Comodi,et al.  Criticalities of district heating in Southern Europe: Lesson learned from a CHP-DH in Central Italy , 2017 .

[29]  Brian Vad Mathiesen,et al.  Smart Energy Systems for coherent 100% renewable energy and transport solutions , 2015 .

[30]  Hongwei Li,et al.  Challenges in Smart Low-temperature District Heating Development , 2014 .

[31]  Janusz Rosada.  Characteristics of district heating - advantages and disadvantages , 1988 .

[32]  Valentina Bosetti,et al.  Advanced Biofuels: Future Perspectives from an Expert Elicitation Survey , 2013 .

[33]  Marco Pellegrini,et al.  Photovoltaic/thermal (PV/T) solar system: Experimental measurements, performance analysis and economic assessment , 2017 .

[34]  T. Tereshchenko,et al.  Challenges and potentials for low-temperature district heating implementation in Norway , 2018 .

[35]  Mei Gong,et al.  Large heat pumps in Swedish district heating systems , 2017 .

[36]  Rasmus Søgaard Lund,et al.  Comparison of Low-temperature District Heating Concepts in a Long-Term Energy System Perspective , 2017 .

[37]  F. Haghighat,et al.  Integration of storage and renewable energy into district heating systems: A review of modelling and optimization , 2016 .

[38]  Svend Svendsen,et al.  Replacing critical radiators to increase the potential to use low-temperature district heating – A case study of 4 Danish single-family houses from the 1930s , 2016 .

[39]  Valentina Bosetti,et al.  The Future Prospect of PV and CSP Solar Technologies: An Expert Elicitation Survey , 2012 .

[40]  U. Persson,et al.  Heat distribution and the future competitiveness of district heating , 2011 .

[41]  Brian Vad Mathiesen,et al.  4th Generation District Heating (4GDH) Integrating smart thermal grids into future sustainable energy systems , 2014 .

[42]  George Papadakis,et al.  Design of biomass district heating systems , 2009 .

[43]  Karin Rühling,et al.  Annex X Final report : Toward 4th Generation District Heating: Experience and Potential of Low-Temperature District Heating , 2014 .

[44]  Lipeng Zhang,et al.  Cost analysis of district heating compared to , 2013 .

[45]  Marc A. Rosen,et al.  District heating and cooling: Review of technology and potential enhancements , 2012 .

[46]  A. Bianchini,et al.  Performance assessment of a solar parabolic dish for domestic use based on experimental measurements , 2019, Renewable Energy.

[47]  Bruno Lacarrière,et al.  Techno-Economic Assessment of Active Latent Heat Thermal Energy Storage Systems with Low-Temperature District Heating , 2017 .

[48]  Svend Svendsen,et al.  Decentralized substations for low-temperature district heating with no Legionella risk, and low return temperatures , 2016 .

[49]  Sven Werner,et al.  Fault detection in district heating substations , 2015 .

[50]  Isabelle Best.  Economic comparison of low-temperature and ultra-low-temperature district heating for new building developments with low heat demand densities in Germany , 2018 .

[51]  Svend Svendsen,et al.  The status of 4th generation district heating: Research and results , 2018, Energy.

[52]  Svend Svendsen,et al.  Energy and exergy analysis of low temperature district heating network , 2012 .

[53]  Cherie D Maestas,et al.  Expert Surveys as a Measurement Tool , 2018 .

[54]  R. Chacartegui,et al.  Potential of biomass district heating systems in rural areas , 2018, Energy.

[55]  Bernd Möller,et al.  Heat Roadmap Europe: Combining district heating with heat savings to decarbonise the EU energy system , 2014 .

[56]  S. Werner,et al.  Novel low temperature heat distribution technology , 2018 .

[57]  Jianzhong Wu,et al.  Energy consumption and economic analyses of a district heating network , 2013 .

[58]  David Connolly,et al.  Smart energy and smart energy systems , 2017 .

[59]  A. Bianchini,et al.  Natural gas distribution system: A statistical analysis of accidents data , 2018, International Journal of Pressure Vessels and Piping.

[60]  Patrick Lauenburg,et al.  Smart district heating networks – A simulation study of prosumers’ impact on technical parameters in distribution networks , 2014 .

[61]  Patrick Lauenburg,et al.  Prosumers in district heating networks – A Swedish case study , 2016 .

[62]  Omer Comakli,et al.  Evaluation of energy and exergy losses in district heating network , 2004 .

[63]  Sven Werner,et al.  International review of district heating and cooling , 2017 .

[64]  Michael Eraut,et al.  Expert and expertise: meanings and perspectives , 2005 .

[65]  Patrick Reiter,et al.  BIG Solar Graz: Solar District Heating in Graz – 500,000 m2 for 20% Solar Fraction , 2016 .

[66]  L. G. Cassitto.  District heating systems in Europe. A review , 1990 .