Question

Name 5 methods for checking a heat exchanger.

a) Visual inspection, flame inspection, pressure test, thermocouple test, smoke test
b) Voltage test, amperage test, continuity test, resistance test, ohmmeter test
c) Airflow test, static pressure test, temperature rise test, duct leakage test, blower wheel test
d) Combustion analysis, gas pressure test, carbon monoxide test, flame sensor test, flame rectification test

Answer 1

The question addresses methods for checking a heat exchanger, with the correct ones including visual and flame inspection, pressure and thermocouple tests, and a smoke test. Daily life examples of heat transfer include conduction in heating up a cold chair, convection from a room heater, and radiation from sunlight.

Step-by-step explanation:

The question refers to different methods for checking a heat exchanger. The correct methods are: a) Visual inspection, which allows you to see any physical damage or leaks; b) Flame inspection, where you check the color and pattern of the flame which can indicate combustion problems; c) Pressure test, which involves applying pressure to the system to check for leaks; d) Thermocouple test, where thermocouples are used to measure temperature differences that might indicate issues; and e) Smoke test, which can help identify leaks by observing smoke patterns within the system.

Using daily life examples: For conduction, when sitting on a cold metal chair and feeling it warm up due to body heat; for convection, when feeling the warm breeze from a heater circulating in a room; and for radiation, when standing outside on a sunny day and feeling the sunlight warm your skin.