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.

1. Filter
2. Cooler
3. Pre heater
4. Pre insulated air pipe
5. Sound attenuating air terminal containing electric re-heater and overheat thermostat
6. Automatic steam valve
7. Steam trap
8. Multi step cooling thermostat
9. Compressor
10. Automatic Capacity Control valves
11. Condenser
12. Thermostatic expansion valve
13. Sea water pump
14. Fan starter
15. Compressor starter
16. Sea water pump starter
17. Heater Contractor
18. 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