Which ventilation system is used in conjunction with the ship's air conditioning for heating and cooling?

The re-circulating system is essential in modern ship ventilation and HVAC (heating, ventilation, and air conditioning) systems because it allows for the effective heating and cooling of air within the ship. This system works by reintroducing air that has already been conditioned (either heated or cooled) into the living and working spaces, which helps maintain a consistent and comfortable environment.

By reusing the conditioned air instead of solely relying on fresh outside air, the system enhances energy efficiency and can lead to better temperature control, reducing the load on the ship's air conditioning system. This is particularly important in maritime environments where external conditions may be variable or harsh. The re-circulating system typically involves filters to maintain air quality by removing dust, pollutants, and other particulates, ensuring that the air remains clean and comfortable for the crew and passengers onboard.