Reheat System – Air Conditioning on Ships
In reheat system, the air is pre heated at he central unit; its temperature is being automatically controlled. The air terminals are equipped with electric or hot water heating elements. These raise the temperature of the air to meet the demands of the room thermostats which are individually set. The diagram below shows a reheat system for air conditioning.
- Filter
- Cooler
- Pre heater
- Pre insulated air pipe
- Sound attenuating air terminal containing electric re-heater and overheat thermostat
- Automatic steam valve
- Steam trap
- Multi step cooling thermostat
- Compressor
- Automatic Capacity Control valves
- Condenser
- Thermostatic expansion valve
- Sea water pump
- Fan starter
- Compressor starter
- Sea water pump starter
- Heater Contractor
- Room type thermostat
In summer, the air temperature is controlled by a multi step thermostat in the re-circulating air stream, which governs the automatic capacity control of the refrigerating plant. In the case of electric reheat, fire protection is provided by overheat thermostats which shut down he heaters in the event of air starvation, while a fan failure automatically cuts off the power supply.
References
“Marine Auxiliary Machinery” by H.D. McGeorge