• HeatTank


    New generation add-on for cooling systems



    The weaknesses of cooling systems are everywhere. This storage system eliminate easily these problems.

    HeatTank is a patented solution! It is aiming to reduce cost of cooling-associated electricity by increasing and balancing the efficiency of the cooling system. Additionally also provide an extra layer of operational safety in case of cooling equipment failure. As its name suggests, HeatTank serves as an energy buffer with independent control logic.

  • Team of HeatVentors

    Storing energy is a great challenge for engineers. Spotlight is usually put on storing electricity, however thermal energy storage, i.e. storing heat or cold, is also a key issue for effective energy management. It is estimated1, that 20 billion euros or 250 million metric tons of CO2 equivalent green-house gases could be saved only in Europe with optimal thermal energy storages.

    We are a dedicated engineer team with 7 years experience in thermal energy storage. We started as a university research to investigate thermodynamics and the Phase Change Materials. We made a modeling algorithm, to simulate the processes inside these materials and create more efficient energy storages. Since than we verified our solution with prototypes and pilot projects and we are the proof that everybody can reach his or her dreams with hard work and commitment.

    HeatVentors’ mission is to find efficient and environmental friendly solution for the arisen problems with thermal energy storage. There are many known solutions even so an engineer can never accept a current, quite-good solution but have to create and develop something new. Our technology is patented, but our research can never end, our goal is to reach better and better scientific results, make the energy systems more efficient and save the environment.

  • Thermal energy storage with Phase Change Materials

    Our patented technology

    Thermal energy storage


    We can store the cooling energy which was produced by low outside temperature and high efficiency. When the outside air temperature becomes high and the efficiency is low, we can use the pre-stored energy and turn off the cooling system. Also we can use the outside air to store the cooling energy like free-cooling but we use the cooling energy indirectly, so the disadvantages of free-cooling do not occur (dust and moisture).

    For thermal energy storage traditionally we use water storages which stores energy by changing the temperature of the water, using the specific heat. However it is not efficient, because the specific heat of water is very low, only 4,2 kJ/kg K. An alternative solution is using phase change materials (PCM) and the latent heat for thermal energy storage. Instead of changing the temperature to store heat, we change the phase of the material (melting/solidification). This storage is more concentrated because the latent heat is much higher than the specific heat. (The latent heat of the water is 335 KJ/kg.) The melting temperature of water is 0°C which is too low for the servers and cooling to 0°C is expensive. The best solution is to use materials which melting point fits to the application.

    The benefits of HeatTank


    • compared to the water storage HeatTank is 90% smaller in size
    • compared to the water storage HeatTank is useable for cooling as well
    • it makes the existing cooling systems 20-40% more efficient
    • in case of optimal size, the average ROI is 3-4 years
    • patented structure for the highest efficiency
    • customised solutions

    With our control system HeatTank always works at optimal level. Based on the inside and outside temperature, and the trends in the outside temperature, we can control the charging and discharging periods, to gain even higher energy savings.

    After the personal audit we offer customised solutions. The biggest HeatTank is 500 kWh, but our storage is modular, we can use more HeatTank at once if needed, and the installed system is expandable if the needs are changing.

    In addition we offer energy reports to our clients to be up-to-date regarding to the operation of their energy systems and the quantity of the saved electricity.

    Thanks to our modelling algorithm we can offer fast solutions for the individual needs, and we can adapt HeatTank to every existing system.

  • How does it work?

    Check our short demo video!

  • Our Products


    The Heatventors team worked with award-winning team of engineers and scientists to create next generation solutions that would meet the needs of different thermal energy users - suitable to a wide range of heat energy saving from individual users to industrial customers.

    Check them out below!.

    Data center/Telecommunication site cooling

    Industrial heating/cooling/waste heat recovery

    Offices buildings thermal energy management



  • Data Center COOLING

    Check the details of our pilot project

    The Need


    Data centers/telecommunication sites needs to be cooled 24 hours at 7 days. They optimally operate at 24-28⁰C temperature. They are cooled similarly to industrial air conditioning using electrical energy. Unfortunately, the system is the least energy efficient when the temperature difference is the highest (i.e. the outside temperature is too high). However, in the night, when the temperature is low outside, the cooling system is much efficient, or even not needed. Storing the “cold of the night” and use it for cooling daytime could lead to significant savings.

    Please check our CTOs Pich about this application!

    The Parameters


    Our pilot was installed to the data center of a telecommunication company. The heat generation of servers is 2,5 kW, the ACs (the air conditioners) are 2x6 kW and the optimal inner temperature is 26 °C.

    The installed HeatTank has 25 kWh capacity, 100 kW performance, 0,5 m3 size, the used PCM changes its phase between 19-21 °C and it can cool alone for 8-10 hours.

  • Pilot results

    At night the operation of the air conditioner (AC) is the most efficient (due to lower outside temperature). In this period PCM freezes due to heat removal. If the outside air is cold enough, air-condition is even not needed (this approach is called “free cooling”). When outside temperature rises PCM stays in solid phase (cooling capacity is set apart), and the AC is responsible only for cooling the room. When outside temperature is the highest, the AC operation is the least efficient. In this period PCM melts removing heat (while AC is turned off). When melting is finished the room is cooled by AC operation again.

    At the end of the day the difference between the electrical energy consumption savings in Period III (green area) and the additional electrical energy consumption surplus in Period I and IV (red areas) results in a net balance: 20-40% energy saving. If the outside air is cold enough in the night, air-condition is even not needed, “free cooling” can be used to freeze the PCM and cool the servers, resulting in even lower energy consumption.


    Overall we obtained 54% electricity saving on the cooling, which results in 4,06 years ROI.

  • Contact Us

    If you are interested, don't hesitate to contact us!