For a fully automatic provisions refrigeration system incorporating a number of rooms.(16)
a) Explain how each room temperature is set
b) Describe the sequence of events following a demand for increased refrigerant flow from on room.
c)State with reasons the devices incorporated into the system to protect the machinery and equipment against malfunction.
d)State how satisfactory operation of the plant can be established?
Reference Answer
### a) Setting Room Temperature In a fully automatic multi-room provisions refrigeration system, each room's temperature is independently controlled by a dedicated thermostat. The setting and operation process is as follows: 1. **Thermostat Mechanism**: Each room is equipped with a thermostat consisting of a sensing element (phial or bulb), a capillary tube, a bellows or diaphragm, and an adjustable spring mechanism connected to an electrical switch. 2. **Sensing Bulb Placement**: The sensing bulb is strategically placed in the return air stream of the room's evaporator (cooler). This ensures it measures the average temperature of the air circulating within the refrigerated space, providing an accurate representation of the room's condition.
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