Final answer:
A bleed-type space thermostat uses a bimetal sensing element and a vane to control temperature. When the temperature exceeds the desired set temperature, the bimetal sensing element expands and moves the vane to close the bleed nozzle, reducing the flow of hot air or fluid.
Step-by-step explanation:
A bleed-type space thermostat operates based on the principle of bimetallic expansion and contraction. It consists of a bimetal sensing element, a vane, and a bleed nozzle. When the temperature in the space exceeds the desired set temperature, the bimetal sensing element expands, causing the vane to move and close the bleed nozzle. This reduces the flow of hot air or fluid, thereby regulating the temperature in the space.