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.
VRF systems are one of several modern variable-speed and variable-output systems that provide lower energy costs and quiet, comfortable HVAC operation. View larger. Variable refrigerant flow systems (VRF) are a more sophisticated version of the minisplit HVAC system used throughout the world.