Welcome to the website of the Rescue project

The project REnewable Smart Cooling for Urban Europe (RESCUE) aims to address the key challenges for the further development and implementation of district cooling using low and zero carbon emitting sources, thereby enabling local communities to reap the environmental and economic benefits of this energy efficiency technology.

The 4th Newsletter published- Good bye!

Dear friends of renewable district cooling,

we are saying Good-bye by testing your knowledge on district cooling in our Newsletter Nr. 4, downloadable here.

Content of the Newsletter:

Page 1: Test on District Cooling (eight questions, more than one answer can be correct.

Page 2: Heat Maps provide Advice for European Energy Policy (STRATEGO Project)

             Identified Barriers of Building DC Systems and how to overcome them

Page 3: Three ways of storing cold in three cities

             Answers for the test on page 1

Page 4: Northern Europe. District Cooling in Solna/Sundbyberg

            Southern Europe. Short Dissemination Report from Italy

Your RESCUE-team

FINAL REPORT: For utilities, building owners and local municipalities

Dear Rescue friends,

we are more than happy to announce that we completed an uneasy task of preparing a compact and short document on district cooling.  We tried to cover the nub of information relevant for utilities, building owners and local municipalities. Please find various language versions of COOL Conclusions and in the great design.


Don’t stay on the sidelines of the debate and for more information and/or sending a printed publication, please contact us at m.grajcar@agfw.de. 

Your Rescue team

GUIDELINES in English available to download!

Dear Rescue friends,

we continue publishing our final reports – please find our Guidelines “Successful Roll Out of district cooling projects” below. In the Guidelines you will find all business process steps described in detail, the role of various stakeholders (energy utilities and local governments), ways how to minimize financial risks and other useful information from district cooling systems already in operation.


Your Rescue Team

Best practice examples published

Dear Rescue friends,

Best practice examples of District cooling systems are published and can be downloaded here! In the report, you will find the description of six district cooling systems (Paris, Vienna, Stockholm, Solna/Sundbyberg, Helsinki and Växjö), lessons learnt covering good practices such as issues on stakeholders or the importance of early actions as well as the information on barriers and common failures.

Your RESCUE team

Expert Workshop in Germany: 15th April 2015

Dear RESCUE-friends,

let us announce you that the third expert workshop takes place on the business premises of  AGFW  in Frankfurt(Main) on 15th April 2015 with a main topic: Evaluation of the Calculation tool developed by RESCUE-partners. Our invitation to the workshop was already sent by email and results of the workshop will be published a few days after the event. You will find “the RESCUE report on Support Package Tool List” under the section Project Documentation. For more information on the calculation tool, please contact us: m.grajcar@remove-this.agfw.de.

Your RESCUE team from Germany

Wien-Berlin-Frankfurt: District Cooling Experience (short report on workshop results)

Speakers: Boris Lubinski (AGFW), Burkhard Hölzl (Wien Energie), Gerhard Plambeck (Vattenfall Europe Wärme, Berlin), Dr.-Ing. Mathias Safarik (ILK Dresden), Dr. Heinrich Lienkamp (Infraserv, Höchst KG, Frankfurt/Main).

Number of participants: 23   Moderator: Adolf Topp

Adolf Topp opened the workshop with a main question: what are the reasons for a slow deployment path of district cooling technology in Germany? Irrationality of stakeholders, prices, advisors preferring other technologies or in general non-profitability of DC networks? The initial round of introductions revealed that almost half of participants come from the industry sector, the same number of participants from energy utilities, one from the city energy department and one from the research institute.

 Boris Lubinski (AGFW) gave a presentation on four kinds of the cooling supply systems: distributed trigeneration with decentralized thermal cooling (DH network, chiller and re-cooling at the building site), district cooling with centralized trigeneration e.g. in Vienna, sub-district cooling with trigeneration e.g. in Berlin and district cooling without trigeneration e.g. partly in Munich. What should be a more desirable asset: trigeneration or high efficient electrical chillers? Preservation of sites of historic interest in Paris prevented Parisians from installing individual cooling devices and gave a green light to district cooling.

Boris Lubinski stressed the biggest advantage of heat and cooling infrastructure systems is their flexibility to use any fuel or energy otherwise wasted and combine it with the most suitable technological solution. District cooling connects local needs with local sources.

Burkhard Hölzl (Wien Energie) enabled participants to gain a deeper understanding of district cooling system in Vienna in technical, economical and marketing aspects. District cooling takes part in the cross-selling initiative of the utility, a customer can be supplied with both products; i.e. district heating and cooling with the temperature difference of 10 K for new customers. Austrian utilities can use the investment financial support at maximum 35 % if at least 50 % of the cooling comes from absorption chillers. In Vienna, absorption technology covers one third of the whole cooling capacity, the rest is covered by compression chillers. Deployment of district cooling is facilitated by the fact that every single spared square meter in central Vienna is an asset for building owners. Wien Energie keeps an eye on new development areas such as heat pumps.

Gerhard Plambeck (Vattenfall Europe) provided a keen insight into the biggest DC system in Germany - in Berlin. Cooling demand depends on various factors such as holidays, office hours, humidity and the system in Berlin achieved the simultaneity factor at 0.6 last year, with the temperature parameters of supply/return at 6/12 °C; new customers are contracted to the bigger temperature difference ΔT. Vattenfall operates cooling devices with a capacity of 44 MW in the energy center Potsdamer Platz. One of the lessons learnt is the recommendation to connect customers indirectly.

Dr. Mathias Safarik (ILK Dresden) introduced participants to vacuum-ice slurry technology. Under constant pressure of 6 mbar and at the freezing temperature at -1°C, large amount of cooling energy can be provided by the phase change to the solid phase and back (the enthalpy of evaporation: hv = 2500 kJ/kg). He highlighted advantages of ice-slurry technology such as the use of water as refrigerant and the high cooling capacity and thus a five times bigger storage density of slurry compared to cold water and expressed the wish of the Institute to find for partners from the industry sector in order to develop joint projects.

Dr. Lienkamp (Infraserv) contributed to the workshop with his presentation on the district cooling supply in the industry field. Within the cooling products portfolio, brine (- 12°C), ammonia - DC, cold water (4-6 °C) and per contracting cold water of temperature 12 °C, binary ice are listed. Ammonia in the range of -15 –20°C is transported to customers by two networks, each at length of 1,5 km, evaporation takes place at their installations. The representative from the city energy department emphasized the transparency for costs of alternative solutions to district cooling. In addition, customers overestimate the amount of cooling they need what results in misconceptions while considering a district cooling option.

The organizer of the event, AGFW, thanks all speakers and participants for their valuable comments on the situation of district cooling in Germany and its economic efficiency. Presentations of speakers were sent to all participants and are available on request (m.grajcar@remove-this.agfw.de).

Your RESCUE team from Germany

Photos: Zarmina Temuri (AGFW)


Wienna-Berlin-Frankfurt: District Cooling Experience

District cooling Workshop in Frankfurt/Main on 10th February 2015

„Every district cooling system is unique. Three DC systems, three success stories."

Let us invite you to the German speaking workshop on experiences with district cooling systems on 10th February 2015 from 10:30 – 14:30. The workshop starts with the round of introductions of participants and the introductory presentation on different district cooling concepts. Our speakers will present their lessons learnt while installing, operating district cooling systems in above-mentioned cities. After final discussions, the participants are invited to the lunch.

Where: AGFW, Stresemannallee 30, 60596 Frankfurt/Main

Fee: There is no fee for attending the workshop.

For the agenda of the workshop or more information in general, please contact Maria Grajcar from AGFW, m.grajcar@agfw.de or +49 69 6304 281.

Conclusions from the Podium Discussion in Berlin

Dear district cooling friends,

conclusions from our first session taking place in Berlin on 15th December 2014 are as follows:

1. Optimal mix of the production technologies shall be found for every single district cooling system. Absorption cooling is just one of the solutions. CO2 high temperature heat pumps could be used. However, CO2 is not the refrigerant to choose if the outlet media temperature is low and the temperature difference is low.

2. Decentralized trigeneration and cooling with the solar energy have increased their market shares on the cooling market recently.

3. Debate on different tariffs for heat used as energy input for absorption chillers in summer and winter is welcome.

4. From the company point of view, a good opportunity to install district cooling pipes comes with either the refurbishment of DH pipes or expanding of DH system.

5. District cooling zoning (e.g. Paris due to preservation protection and legionella issue) would assist making the investment safer but may face political opposition in many countries.

6. Primary energy factor is one of the indicators to be used as a driving factor for district cooling for policy makers. National legislation may provide further indicators like the amount of CHP heat used in the cooling System (e.g. German EEWärmeG or KWKG). Among others, CO2 emissions of different cooling technologies and economic efficiency may be crucial. Policy makers at the city level pay attention to the broader energy policy on the state level.

7. New F-gas Regulation applies from 1 January 2015 and it is a game changer for the whole refrigeration industry. It limits the amount of HFCs which can be placed on the market in the EU from 2015 onwards. One argument more for a new trend: cooling production to be placed at the distance from consumers.

8. Different reasons for the slow development of district cooling:

-district cooling demand is not-known

-projects lacking economic efficiency

-lack of dissemination among consumers and lack of demand in the residence sector

-missing communication among departments within the utility

-missed opportunities (time gap) while planning or renovating the city infrastructure

-cost analysis from the building owner’s point of view

-utility culture of low risk tolerance

-technical issues do not play a big role but small delta T and big diameters of pipes are –naturally- understood as the disadvantage of district cooling systems

9. For central DC systems, the location of the main installation is crucial, one of the advantages of the Berlin DC system.

10. Drivers of district cooling development: a. synergy between the city and utility policy b. within the utility: specialized “district cooling working group” solely responsible for the district cooling business of the utility

Save the date: the next Workshop on District cooling with the working title: Wienna-Frankfurt-Munich: Experiences will take place on 10th February 2015 in Frankfurt am Main.

Presentations are available for you to request (m.grajcar@remove-this.agfw.de).

Your RESCUE-Team from Germany

District cooling and Estonian poetry hand in hand at the DH Research Workshop in Tallinn!

Dear RESCUE friends,

on 11th December 2014 Estonian Power and Heat Association (Eesti Jõujaamade ja Kaugkütte Ühing) in cooperation with FFI (Fernwärme Forschungsinstitut Hannover) and AGFW organized District Heating Research Workshop at the Tallinn University of Technology. More than 70 participants discussed the latest district heating research issues with German guests: Dr. Ingo Weidlich, the scientific director of the FFI, Hannover, Ole Eichhorst and Maria Grajcar, both from AGFW. You can find the agenda of the workshop here. Maria Grajcar (AGFW, one of the RESCUE project partners) started her presentation on district cooling by elaborating upon the perception of cold in three poems written by excellent Estonian poets: Juhan Viiding and his Cold Day, Marie Under: Question and Jaan Kaplinski’s This morning was cold. This rather unconventional introduction was followed by explaining basic thermodynamic principles of (district) cooling, schemes of typical district cooling systems, examples from Helsinki (Katri Vala plant) and Berlin. Thanks to cooperation with the STRATEGO project, their newest results on cooling demand- average specific for service sector and current cooling market were showed. You will find this presentation here.

District cooling was just one of the presentations, the moderator and the author of the concluding speech, Andres Veske introduced research topics such as solar district heating (presented by Ole Eichhorst), optimization of DH Distribution Technology (Dr. Ingo Weidlich), CHP market in Germany (Maria Grajcar), parallel heating and CO2 emissions ( in Estonian by Siim Link, Tallinn University of Technology), Modern Trends on District Heating Technology (prof. Andres Siirde, Tallinn University of Technology) and results from IEA Research Activities (Ole Eichhorst).

Link to the presentations: http://www.epha.ee/uudised/46-kaugkuette-seminar-tallinnas-11-12-2014

More photos from the event: http://www.epha.ee/galerii/pildigalerii/2014-12-11-kaugkuette-seminar-tallinna-tehnikauelikoolis

 We would like to thank our Estonian partners, mostly to Mrs. Önne-Ly Reidla (the Managing Director of the EPHA) and Andres Veske (the Chairman of the EPHA) for the organization of the workshop and their valuable insights into the Estonian district heating and cooling sector.

             Andres Veske

  Maria Grajcar, Kaja Sakk (the interpreter) Ole Eichhorst, Dr. Ingo Weidlich

Your RESCUE team from Germany

Music festival, Milan – Sanremo cycle race and now: district cooling workshop in Sanremo!

Dear district cooling friends, for those of you able to speak Italian, please consider attending the workshop in Sanremo on 28th November 2014 with the long title: "The district cooling as a method of energy rationalization in the field of air conditioning" RESCUE project: European - Italian experiences.

Place: Via della Repubblica 10 , Sanremo (Imperia), Region of Liguria, Italy 

Start of the workshop: 2.30 pm

Type of participants: Plant Design Engineers

Among presentations you can find:

• Liguria’s Energy policies about the rational use of Energy and renewable sources: the Regional Energy Plan. • Presentation of the project RESCUE. • New legislation on the energy performance of buildings • Heat pumps: strategies and design choices to maximize energy efficiency • Examples of district cooling in European cities • How to develop a feasibility study for a hypothesis of district heating / cooling.

For any more information or the registration, please contact us.

Your Rescue team from Italy

Summary of the conference in Freiburg (23rd October 2014)

Dear RESCUE friends,

you can find the summary of the conference and presentations in English in the Section News.

             Your RESCUE Team from Freiburg

Italian partners inform: workshop in Savona on 17th November 2014

The workshop with a long but precise title "The district cooling as a method of energy rationalization in the field of air conditioning“ is taking place in Savona, the city famous for Italian iron industry and its former inhabitant, the navigator Christopher Columbus.

Where: Sala Rossa, Comune di Savona, Savona 

When: 17th November 2014, 2:30 pm

Language: Italian

The workshop aims to provide an overview on district cooling advantages as well as problems and strategies to overcome them. The operational tools developed within the Rescue working group will be presented, too.

Among presentations you can find:

  • Liguria’s Energy policies about the rational use of energy and renewable sources: the Regional Energy Plan.
  • Savona’s Energy policies.
  • Presentation of the project RESCUE.
  • New legislation on the energy performance of buildings
  • Heat pumps: strategies and design choices to maximize energy efficiency
  • Examples of district cooling in European cities
  • How to develop a feasibility study for a hypothesis of district heating / cooling

The second workshop will take place in Imperia (Italy) on 28th November 2014 and we will provide you with information as soon as possible! For more information or registration, please contact us via email: ospedali@remove-this.ireliguria.it.

Your RESCUE team from Italy

Results of District Cooling Workshop in Tartu, Estonia

Dear District Cooling friends,

let us inform you about results of the Workshop Renewable Smart Cooling for Urban Europe that took place in Tartu (Estonia) on 17th October 2014 (find agenda of the workshop here):
• Successful projects require good relations among the city, the energy company and customers.
• There is the wish and will of the local energy company to cover the whole energy demand of the households in Tartu
• Should be district cooling network built for the whole city at once? Given the fact of the low difference of supply and return temperatures (so-called low ΔT), too high distribution investment costs would be required for a construction of the district cooling network for the whole city (unless there is a really dense area with a remarkable cooling demand).
• High trust in district heating means a big bonus for the beginning of district cooling business.
• There are no legal or administrative barriers to develop district cooling in Estonia. Financing and making district cooling profitable seems to be the biggest issue.

For more information on the Workshop, please visit the section News.
Your Rescue Team from Sweden and Germany

First preliminary results on Cooling demands in buildings in the EU28!

At the second project meeting of STRATEGO taking place in Copenhagen on 4th November 2014, Dr. Sven Werner, the professor at the Halmstad University (Sweden) presented first preliminary results on the European cooling analysis. You may be especially interested in the European map with average specific cooling demands (page 4). The work is still in progress and new information can be added. Final results are available in February 2015.

We are thankful to prof. Werner and Stratego consortium for allowing us to include their results on our website. The cooperation between Rescue and Stratego project will continue and you can find more information on Stratego project on: stratego-project.eu or contact directly the project coordinator Nicolas Fevrier,

Your Rescue team

For more News, please check the section: News/Aktuell.