One of the most common myths about nodules is the diagnosis itself! Usually doctorâs donât have the necessary equipment (stroboscopy) to diagnose vocal problems. So all problems are called nodules. Every singer has a colleague who had ânodulesâ for this reason.
Glossary of HVAC terms. HVAC (heating, ventilation, and air conditioning) is a major subdiscipline of mechanical engineering. The goal of HVAC design is to balance indoor environmental comfort with other factors such as installation cost, ease of maintenance, and energy efficiency.
A BTU (British thermal unit) is the basic measure of heat/thermal energy. One BTU is the amount of energy needed to raise the temperature of 1 pound of water by 1Â° Fahrenheit. BTUâs are a non-metric unit of measure that is commonly used to rate the heat output of fuels and heating appliances. Most heating systems produce thousands of BTUâs.