An office building uses a microprocessor-controlled air conditioning system. The table shows the settings. Parameter Pre-set value Sensor used Temperature 2...
Question 1 Report
An office building uses a microprocessor-controlled air conditioning system. The table shows the settings.
| Parameter | Pre-set value | Sensor used |
|---|---|---|
| Temperature | 22 degrees C | Temperature sensor |
| Humidity | 50% | Humidity sensor |
| Air quality | CO2 below 800 ppm | CO2 sensor |
(a) Describe how the microprocessor maintains the temperature at 22 degrees C. [3]
(b) Explain what happens when the CO2 level rises above 800 ppm. [2]
(c) State one benefit of monitoring humidity in an office environment. [1]
Answer Details
(a) How the microprocessor maintains the temperature at 22 degrees C:
- The temperature sensor continuously measures the current room temperature and sends the reading to the microprocessor. [1]
- The microprocessor compares the reading with the pre-set value of 22 degrees C. [1]
- If the temperature is above 22 degrees C, the microprocessor signals the cooling unit to activate to bring the temperature down. If the temperature is below 22 degrees C, it signals the heating element to activate to raise the temperature. [1]
(b) What happens when the CO2 level rises above 800 ppm:
- The CO2 sensor detects the rise above 800 ppm and sends the reading to the microprocessor. [1]
- The microprocessor sends a signal to open ventilation fans or air intake valves to bring in fresh air from outside, reducing the CO2 concentration back to an acceptable level. [1]
(c) One benefit of monitoring humidity in an office environment:
Maintaining the correct humidity level prevents the air from being too dry (which can cause discomfort such as dry skin and irritated eyes) or too damp (which can encourage mould growth and damage equipment). [1]
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