This is the where you will find all COOL DH public reports. We hope that they will inspire and give you new insights on how to improve the efficiency on district heating and cooling systems.

Technical specifications for substation solutions for single family units

In the new generation of district heating networks, the lower supply temperature reduces the heat losses in the distribution network, reaching a higher efficiency of the system. However, reduced temperature increases the risk of Legionella contamination in domestic hot water systems. This report aims to give an overview of the technical solutions that can be implemented in low-temperature district heating networks and fulfil the energy and the safety requirements of the users.

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New design concepts for optimisation of LTDH distribution systems

The purpose of this report is to explain the design process that can lead to the reduction of the heat losses in a district heating system as well as to present the main factors that affect the heat losses. In particular, the factors considered are; improved pipe insulation, use of twin pipes, reduced pipe size, reduced pipe length and the distribution principle in between the buildings.

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Solutions for local integration of renewable energy sources (RES)

This deliverable summarizes and gives an overview of existing and newly developed technical solutions used for the domestic hot water production that can be implemented in low temperature or ultra-low temperature district heating networks, and that can increase the share of renewable energy in the building sector.

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System solutions for multifamily houses and tertiary buildings

The pipe heat losses in the circulation of domestic hot water (DHW) can be high in comparison to the demand and use of DHW. Flat stations can be used in order to potentially lower these heat losses. Kraftringen, COWI A/S and Cetetherm have looked closer on solutions with flat stations in buildings with low district heating (LTDH).

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Development of short time and seasonal energy storage

Høje Taastrup District Heating and COWI A/S have examined the potential of a short time and seasonal energy storage in the municipality of Høje-Taastrup. The storage will be established as an ATES plant.

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Report on solutions for avoiding risk of Legionella

Low temperatures in domestic hot water systems increases the risk of growth of Legionella bacteria which if inhaled can cause Pontiac fever or Legionnaires’ disease. Lund University, Kraftringen and COWI have worked on a report that investigates solutions for avoiding risk of Legionella when using LTDH.

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Working paper on LTDH connected appliances – washing machines, dishwashers etc. eliminating electricity topping of temperature.

Kraftringen and COWI A/S have produced this report that shortly describes the technology and history of HWC (Heating Water Circuit) appliances, as well as traditional dishwashers that are connected to hot tap water and washing machines with both hot and cold water connections. The appliances are evaluated in the context of LTDH (Low Temperature District Heating).

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Working paper on optimising cascade couplings for optimal use of low temperature sources

This report studies parameter variations of cascade couplings of heat pumps used to produce district heating based on low temperature heat sources of 7-23°C. The study concludes that the way to reach high energy performance is to put effort into several various aspects. When combined, these efforts will combine into large potential energy savings.

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Flyer – this is COOL DH

This flyer presents the main parts of the project and will give you a quick, overall introduction to let you know what COOL DH is.
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