The air conditioning system is an important component of the service system for the ship safety area. The function of the air conditioning water system is to transport chilled/hot medium water from the cold or heat source to the air treatment equipment. The air conditioning water system includes the chilled water system and the hot water system. The current study researches the impact of Safe Return to Port (SRtP) requirements on the design of the air conditioning water systems of large cruise ships, addressing the design ability for the SRtP of cruise ships. Firstly, the purpose of the design of the air conditioning systems for the SRtP of large cruise ships is presented based on the SRtP rules, and the basic design method of the air conditioning water systems for the SRtP of large cruise ships is also proposed. The configuration scheme, system principle and valve operation of the air conditioning water system for the SRtP of a large cruise ship are analyzed and studied to provide the design method of the air conditioning system of the activated safe area and the machinery space supporting SRtP. The results indicate that different design methods should be flexibly selected to simplify the design of SRtP. The research can provide references for the design of the air conditioning water system for large cruise ships in the future.

Large passenger ships usually have multiple galleys to meet the needs of different passengers for delicious food. And each galley demands to be equipped with one or more exhaust fans. The galley therefore requires high exhaust air volume, correspondingly with high energy consumption of the exhaust fan. The galley hood is an important component of the galley exhaust system, which is used to collect water vapor and oil smoke generated by various equipment in the galley. At present, the galley on large passenger ships generally uses the hood for centralized local ventilation. This study analyzes the control technology of the exhaust system of the traditional galley hood on large passenger ships. A new design method of energy-saving exhaust control system is proposed for the galley hood based on the frequency conversion control technology and variable air volume control technology for fans, in order to address the disadvantages of high exhaust air volume and high energy consumption. Through experimental verification on a Ro-ro passenger ship, the air volume data of the galley exhaust fan in the traditional exhaust system are compared and analyzed with those in the energy-saving exhaust system. It is verified that the new galley hood exhaust system has significant energy-saving effect and can be popularized in other ship types.