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How did ZediSense do in the pilot test?

Read below our research partner’s conclusion about the presence detection accuracy of ZediSense. They also discuss where ZediSense data can be used.


Accurate presence detection

PBI Research Institute, a Finnish research-based consulting company, analysed the functionality, presence detection accuracy as well as the savings potential of the ZediSense technology based on research in energy efficiency, especially for HVAC and ventilation systems, on cruise ships and superyachts.


The functionality and accuracy of presence detection was done in a pilot test, where the data of the sensor was compared to manual logs of a cabin user on a cruise ferry in early 2022. The test showed that after minor adjustments during the trial, the ZediSense technology does accurately show the presence of persons in the cabin.


Figure 1 Example illustration of ZediSense data


How to benefit from ZediSense data?

The savings potential of ZediSense is especially interesting for systems on ships that can be operated, optimized, or automated based on presence detection. When the presence in the specific space, for example a cabin on a ship, can be accurately measured, the energy consumption of the space can be optimized. Concretely, this includes how, for example, the air conditioning, heating, cooling, and/or lighting can be operated based on need (presence) instead of pre- or user determined schedules. One typical example of an inefficiency on cruise ships and hotels is leaving the master switch on when the cabins are unoccupied.


According to earlier studies[i] , the savings potential with automation of ventilation or lighting can be up to 25% of the original consumption on cruise ships. For superyachts, the HVAC system energy consumption can be estimated to 40-60% of total auxiliary load [ii], while the auxiliary load may constitute half of the yearly energy consumption of a superyacht[iii] (depending on the operating profile). Therefore, the improvements and energy savings that can be made with automation of these systems are not only minor adjustments, but important contributions on the road to zero emission cruising.


In addition to energy savings, presence detection can also be used in safety and security reacted matters. Moreover, it contributes to the image of smart operations providing sustainable comfort for cruise and superyacht customers.


Contact jere.laaksonen@vttsenseway.com or anu.peippo@vttsenseway.com to purchase ZediSense sensors for your next project.



You can read more about PBI Research Institute on their website.

[i] Nurmi (2017): Improving the energy efficiency of a cruise ship stateroom, Master’s thesis, Aalto University. A similar potential has also been estimated by Brækken (2021): Energy Use and Energy Efficiency Potential on Passenger Ships, Master’s thesis, NTNU. [ii] Osté (2016): Analysis of the impact of adjustments to the on board HVAC design by time domain simulations, Master’s thesis, TU Delft. [iii] de Figueiredo (2018): The Yacht of 2030, Master’s thesis, TU Delft.

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