Thermal efficiency: a low hanging fruit

09 Sep 2024

A new additional notation to assess the thermal performance of a yacht

Operating superyachts requires a significant amount of energy. However, it is only in the last decade that a real focus has been given to technological advancements that can reduce on-board power demand. 

RINA is the first and only Classification Society to introduce an additional notation to assess the thermal performance of a yacht. 

Whilst a decrease in required energy on board is desirable, trends in the new build market show the opposite trend. Modern yachts carry more volume (i.e., higher gross tonnage and displacement) on the same length compared to older vessels. Newly optimised hulls with wider beams, combined with novel additional features, result in increased energy demands on both propulsion systems and hotel load. 

Over a typical year of operation for a modern superyacht, the hotel load is the higher consumer of power. Studies demonstrate that, in many cases, HVAC (Heating, Ventilation, and Air Conditioning) is the most energy thirsty system of all.  

One of the most compelling reasons to optimize thermal efficiency is the potential for substantial operational cost savings: fuel consumption can be significantly reduced, leading to lower fuel expenses, famously among the highest costs of operating a superyacht. 

Indeed, optimising the thermal efficiency of a superyacht is a critical factor in reducing operational costs, enhancing overall performance, and promoting eco-consciousness. 

Efficient insulation, advanced HVAC systems, and waste heat recovery technologies are pivotal in this regard. High-quality insulation minimizes unwanted heat exchange with the environment, while modern HVAC systems are equipped with smart controls to ensure optimal temperature management. Waste heat recovery systems, which capture and reuse heat from engine exhausts or generators, can further cut down on energy waste. 

Moreover, a thermally efficient superyacht can achieve a better range. Reduced fuel consumption means longer intervals between refuelling stops, allowing for extended voyages. 

The “Thermally Efficient Yacht” notation by RINA ranks the vessel by adopting a goal-based methodology and a comparative analysis against baseline superyachts, rewarding vessels that achieve higher standards. As the Classification Society with the largest fleet of superyachts worldwide, RINA has an extensive database of industry standards.  

It is a design-based notation and can be assigned during the engineering process. It analyses the performance of the glazing, the insulation package and the HVAC system. The notation comprises 3 different levels of thermal optimisation, so that each individual benefit can be captured. 

In today's world, environmental responsibility is becoming a priority for the luxury segment, and superyachts, due to their size and energy requirements, have a significant environmental footprint. Optimizing thermal efficiency is a proactive step towards minimizing this impact. 

By receiving this new prestigious notation, owners can enjoy the unparalleled luxury of superyachts whilst contributing to a more sustainable future for our oceans and planet, as well as achieving a higher resell value for their assets.