Thermal collectors and store the free solar energy within the floor Phase Change Material thermal energy storage (PCMTES)and in return over-night this stored energy acts as a radiant heating floor and keep the occupied space warm. As the heating can be provided without using any primary energy source it offers an unparallel environmentally friendly and cost-effective solution for both domestic and commercial heating applications. Furthermore, as PCM-TES has no moving parts it also offers a maintenance free heating system.


y introducing eutectic products into a radiant heating system, it is possible to capture excess heating during day time using conventional solar collectors such as vacuum collectors or PV

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ThinICE Concept

By simple adding 27°C (81°F) ~ 34°C (93°F) phase change material (PCM) encapsulated in sealed HDPE modules one can increase the heat storage capacity of the floor screed by 50-fold. As this material captures energy by melting and releases it when it freezes using solar free energy it offers a cost effective and environmentally friendly heating option.

As this material captures energy by melting and releases it when it freezes using solar free energy it offers a cost effective and environmentally friendly heating option. If required a small scale heat pump can be incorporated not only to top up this heating but also provide the hot water requirements and even the possibility of running this small heat pump from solar PV cells and may be during off-peak hours one can provide a reliable and very low running cost system with very attractive return on investment.

Thanks to the lack of any moving parts, PCM TES is effectively maintenance free and once installed it simply becomes part of the building. Each module features a number of grooves which are optimally spaced out for runs of underfloor heat pipes, this close contact with the PCM ensures the best heat transfer possible. These allow for pipe lengths to be easily held in place during the installation process, requiring no specialist skills.


In normal conditions the PCM will be in solid form, making the modules very robust. Rows of modules can be laid directly on top of the insulation layer replacing conventional castellated panels. This creates a grid which allows the heating pipe to be laid easily, holding the heat pipe in place throughout the screeding process to ensure that the finished underfloor heating system will distribute heat evenly.

Passive Cooling

It is also possible to use ThinICE modules for free cooling, simply placing them within the ceiling area; Whereby over-night cooler space conditions freeze the PCM and in return during day heat gains can be absorbed by the PCM like a heat sponge. As long as the sponge i.e. PCM panel is big enough to soak up the daily heat gains the occupied spaces will remain cooler in comparison without any thermal storage facility. This passive cooling concept could be either static, passive or can be complimented with cooling pipes as in the case of a chilled ceiling concept. Like heating has no moving parts, PCM-TES passive cooling concept offers very attractive low running cost and as the concept utilising free energy it offers a very attractive environmentally friendly cooling options for many domestic and commercial applications.

For further details and any application contact our technical team on +44-(0)-1733 245511 or e-mail:

For more than two decades we have been involved in the development of Phase Change Materials (PCMs). With unrivalled experience in designing and advising on PCM installations and applications, we continue to push the boundaries in PCM usage for the benefit of our ever-growing customer base.

In addition to our technical expertise, we offer (under the PlusICE branding) what we believe to be the most comprehensive range of PCM solutions currently available commercially (-100°C (- 148°F) to +885°C (+1,625°F)).


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