Small Modular Renewable Heating and Cooling Grids A Handbook Authors: Dominik Rutz, Christian Doczekal, Richard Zweiler, Morten Hofmeister, Linn Laurberg Jensen Reviewers: Rita Mergner, Rainer Janssen, Per Alex Soerensen, Tomislav Puksec, Neven Duic, Borna Doracic, Rok Sunko, Blaž Sunko, Vladimir Gjorgievski, Ljupco Dimov, Natasa Markovska, Nikola Rajkovic, Ilija Batas Bjelic, Anes Kazagic, Alma Ademovic-Tahirovic, Izet Smajevic, Slobodan Jerotic, Emir Fejzovic, Amra Babić, Milada Mataradzija, Mitja Kolbl ISBN: 978-3-936338-40-9 Translations: The original language of the handbook is English. This handbook is also available in the following languages: Bosnian, Croatian, Macedonian, Serbian, Slovenian, German Published: © 2017 by WIP Renewable Energies, Munich, Germany Edition: 1st edition Contact: WIP Renewable Energies, Sylvensteinstr. 2, 81369 Munich, Germany [email protected], Tel.: +49 89 720 12 739 www.wip-munich.de Website: www.coolheating.eu Copyright: All rights reserved. No part of this book may be reproduced in any form or by any means, in order to be used for commercial purposes, without permission in writing from the publisher. The authors do not guarantee the correctness and/or the completeness of the information and the data included or described in this handbook. Disclaimer: The sole responsibility for the content of this handbook lies with the authors. It does not necessarily reflect the opinion of the European Union. Neither the INEA nor the European Commission are responsible for any use that may be made of the information contained therein. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 691679. 1 Acknowledgements This handbook was elaborated in the framework of the CoolHeating project. The authors thank the European Commission for supporting the project. For permitting the use of information and graphs, the authors thank the following companies and contributors: Wien Energie GmbH (Burkhard Hölzl), DLR (Michael Nast), Steinbeis Forschungsinstitut Solites (Thomas Pauschinger), Thermaflex Isolierprodukte GmbH (Jana Tanneberg-Kranz), W.A.S. Wasseraufbereitungssysteme GmbH (Ralf Kotlan), Snowpower AB (Kjell Skogsberg), Gram Fjernvarme AmbA, Braedstrup Fjernvarme AmbA, Dürr Thermea GmbH, UNEP, Solair Project, GeoModel Solar s.r.o., PlanEnergi, Danish Geothermal District Heating, GeoDH Project, Heat Roadmap Europe Map and Data Portal, PARAT Halvorsen AS, Danish Energy Agency, Energinet.dk, Hjallerup Fjernvarmeværk A.m.b.a., Güssing Energy Technologies, WIP Renewable Energies, Isoterm AS, and Tour & Andersson Ges.m.b.H. 2 The CoolHeating project The heating and cooling demand in Europe accounts for around half of the EU’s final energy consumption. Renewable energy policies often mainly focus on the electricity market, whereas policies for renewable heating and cooling are usually much weaker and less discussed in the overall energy debate. Therefore, it is important to support and promote renewable heating and cooling concepts, the core aim of the CoolHeating project. The objective of the CoolHeating project, funded by the EU’s Horizon2020 programme, is to support the implementation of "small modular renewable heating and cooling grids" for communities in South-Eastern Europe. This is achieved through knowledge transfer and mutual activities of partners in countries where renewable district heating and cooling examples exist (Austria, Denmark, Germany) and in countries which have less development (Croatia, Slovenia, Macedonia, Serbia, Bosnia-Herzegovina) (Figure 1). Core activities, besides techno-economical assessments, include measures to stimulate the interest of communities and citizens to set-up renewable district heating systems as well as the capacity building on financing and business models. The outcome is the initiation of new small renewable district heating and cooling grids in five target communities up to the investment stage. These lighthouse projects will have a long-term impact on the development of "small modular renewable heating and cooling grids" at the national levels in the target countries. An important instrument of the CoolHeating is the present handbook. Although various information materials on technologies for small modular renewable heating and cooling systems exist, there was a need to create this up-to-date handbook that is accessible for free in national languages. In many of the target countries there is lack of such information in national language. The handbook provides an overview of both, technical and non-technical (planning) aspects. The main characteristics of different heat sources from solar, biomass, geothermal and excess heat are described and the opportunities of their combination in small modular RE district heating and cooling system are presented. Seasonal and diurnal storage systems are included, as well as the use of heat pumps. Specific aspects of heating and cooling in small grids are shown. Figure 1: Countries and target villages (red dots) involved in the CoolHeating project 3 Project Consortium and National Contact Points: WIP Renewable Energies, project coordinator, Germany Dominik Rutz [[email protected]] www.wip-munich.de PlanEnergi, Denmark Morten Hofmeister [[email protected]] www.planenergi.dk Güssing Energy Technologies GmbH, Austria Richard Zweiler [[email protected]] www.get.ac.at University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Croatia Neven Duić [[email protected]] www.fsb.unizg.hr Skupina Fabrika d.o.o., Slovenia Rok Sunko [[email protected]] www.skupina-fabrika.com International Center for Sustainable Development of Energy, Water and Environment Systems - Macedonian Section, Macedonia Natasa Markovska [[email protected]] www.sdewes.org/macedonian_section.php University of Belgrade, School of Electrical Engineering, Serbia Nikola Rajakovic [[email protected]] www.etf.bg.ac.rs JP Elektroprivreda BiH d.d.-Sarajevo, Bosnia-Herzegovina Anes Kazagic [[email protected]] www.elektroprivreda.ba City of Šabac, Serbia Slobodan Jerotić [[email protected]] www.sabac.org Opcina Visoko, Bosnia-Herzegovina Emir Fejzović [[email protected]] www.visoko.gov.ba Občina Ljutomer, Slovenia Mitja Kolbl [[email protected]] www.obcinaljutomer.si 4 Content Acknowledgements ............................................................................................................. 2 The CoolHeating project ..................................................................................................... 3 1 Introduction .................................................................................................................. 7 2 Basics about heat ......................................................................................................... 9 2.1 Figures and conversion units of heat ....................................................................... 9 2.2 Heat quality ............................................................................................................10 2.3 Heat use .................................................................................................................10 3 Heating sources and technologies ............................................................................12 3.1 Solar thermal energy ..............................................................................................12 3.2 Biomass systems ...................................................................................................20 3.3 Geothermal energy.................................................................................................35 3.4 Excess heat............................................................................................................38 3.5 Electric boilers: Power-to-Heat ...............................................................................39 3.6 Heat pumps ............................................................................................................41 3.7 Peak load and back-up boilers ...............................................................................48 4 Heat storage technologies ..........................................................................................50 4.1 Short-term storage .................................................................................................52 4.2 Seasonal storage ...................................................................................................54 5 Small modular district heating systems ....................................................................57 5.1 Size of the system ..................................................................................................57 5.2 Temperature level of the system ............................................................................57 5.3 Pipes ......................................................................................................................60 5.4 Heat transport medium ...........................................................................................66 5.5 Connection of heat consumers ...............................................................................69 6 Planning of small heating grids .................................................................................74 6.1 Assessment of the heating demand .......................................................................74 6.2 Design of the heating grid.......................................................................................77