Certified Facility Manager (CFM) Practice Exam

Which heat source is generally the most economical for dryers?

1. Electricity

2. Solar power

3. Gas

4. Coal

The correct answer is: Gas

Gas is generally considered the most economical heat source for dryers due to its efficiency and lower operating costs compared to other options. When evaluating the cost-effectiveness of energy sources for dryers, gas systems tend to have higher thermal efficiency, meaning they can generate more heat from the same amount of fuel. This translates to quicker drying times and lower fuel consumption. In addition, gas is often less expensive than electricity in many regions, which contributes to lower overall energy costs when using gas-powered dryers. The infrastructure to provide natural gas is also widely available, making it a practical choice for both residential and commercial applications. While solar power has the advantage of being renewable, its initial setup costs and variability in availability (depending on weather conditions) can make it less economically feasible for drying needs when immediate heat is required. Electricity, although convenient, typically incurs higher costs per unit of energy, which can add up, especially in industrial settings where dryers are used extensively. Coal is less commonly used in modern applications due to environmental concerns and regulatory requirements, making it a less favorable option for dryer heat sources.