HOT|COOL NO. 4/2019 - "Components"


Another key point is data sharing, which will only accelerate as district energy and other utility companies start reaching for further optimization and synergies. PERSPECTIVES With the international agenda focused on climate change and the reduction of CO 2 emissions, the Danish district energy sector has set ambitious goals. Optimizing technology and operations is one of the key elements in reaching them. While infrastructure projects are often complex and expensive, there are lower-hanging fruits ripe for the picking. By integrating and retrofitting IoT-based components into existing systems, you can obtain energy savings, as well as lower costs for district energy providers and consumers, with relatively low startup expenses and stable operational costs. It is a journey that requires a new mindset. At Frese, we are picking up the pace.

WHAT IS SIGFOX? The Sigfox network is a Low-Power Wide-Area Network (LPWAN), which utilizes narrowband technology. Where Wi-Fi and mobile phone technology lets us send and receive large amounts of data almost instantly, Sigfox can only transmit very small data packages of 12 bytes and receive 8 bytes. This, however, is enough for many IoT products. Because the data packages are so small, and because the units only need to transmit and receive data at certain intervals, they consume very little electricity. This allows them to be battery-operated. Narrowband technology also has very long range and can cover a wide area, so the controller can easily transmit data to a base station several miles away without losing power. Another benefit of using Sigfox is that it is not based on the mobile phone network. This means that the unit needs no sim card but only an integrated chip, which makes it much less complicated. This solution is very easy to install, deploy and operate. The necessary infrastructure is already in place, so there is no need to establish new networks. It is as close to plug- and-play as you can get, with full financial transparency and predictability, ensured by a fixed subscription rate per unit.

For further information please contact: Martin Overbjerg,


A new generation of energy storage from Arcon-Sunmark levels production and provides flexibility all year long. Large-scale energy storage systems are in demand, and for good reason. They make it possible to collect waste heat, surplus energy from wind- and PV farms, solar thermal produced energy and use it whenever it is needed. Also large CHP plants will benefit from this, as it makes it possible to decouple production from heat demand. Energy storage with hot water, called Pit Thermal Energy Storage (PTES) – and used in large scale solar plants – was one of the first of its kind. Now a new generation developed by Arcon-Sunmark in Denmark is arriving. The new generation deals effectively with the challenges from the previous one and comes with a: • Top that is divided into sections for intelligent leakage control • Well with pumps in each section to handle water on the surface • Controlled layer of ballast that keeps the lid in place • Well-insulated lid that minimizes the heat loss from the storage These features – and more – add up to a new performance standard as well as a new level of flexibility all year long.

A new generation of thermal energy storage has been developed by Arcon-Sunmark. It brings PTES to a new standard.

For further information, please contact:

Arcon-Sunmark AS is an international expert in the solar heating sector and supplies everything from solar collectors to large turn-key solar heating systems. Arcon-Sunmark is owned by VKR Holding A/S who invests in companies that bring daylight, fresh air and better environment into people’s everyday life. In total, VKR Holding A/S employs 16.000 people in 41 countries.

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