The dry bulb temperature of the air is measured by a regular thermometer. The wet bulb temperature of the air is measured by a thermometer with a wet cloth wrapped around it which takes into account the moisture content in the air. At dew point temperature, the air is 100% saturated (cannot hold any moisture further), dry bulb temperature will be equal to wet bulb temperature

The ability of air to hold water vapor increases with an increase in temperature. Warmer air molecules have more energy, which allows them to hold more water vapor compared to colder climates.

This is because radiation is a form of electromagnetic radiation, and electromagnetic radiation can be described as a wave.

Water tube boilers operate at higher pressures and temperatures because water is not exposed to the open flame, and the tubes help to distribute the heat more evenly and its made of thicker material

Thermistors are versatile and reliable components that can be used in a wide variety of applications such as temperature measurement, temperature control, current limiting, voltage protection, and industrial control. The temperature-resistance characteristic of a thermistor is non-linear and negative. This means that the resistance of a thermistor decreases non-linearly as the temperature increases. This is in contrast to most other types of resistors.

Refrigerant enters the compressor as a warm, low-pressure gas. The compressor compresses the gas, which increases its pressure and temperature. The high-pressure, hot gas then flows to the condenser.

In general, PI (proportional and integral) controllers are sufficient for most HVAC systems. However, PID (proportional, integral, and derivative)controllers may be required for systems that are subject to rapid changes in load or that require very precise temperature control.

ARI 700 is a standard published by the Air Conditioning and Refrigeration Institute (ARI) that specifies the purity and cleanliness requirements for the reclaimed refrigerant.

Mineral oils and HFC alternate refrigerants are not miscible, meaning they do not mix together. This can lead to reduced efficiency, corrosion and clogging in refrigeration system

1-horsepower engine or motor is capable of producing 746 watts of power

The yellow color indicates that the cylinder is used for the recovery of refrigerants. The gray color indicates that the cylinder is made of steel.a

The capacity of a natural gas furnace is derated by 4% for every 1,000 feet above sea level. This is because the air is less dense at higher altitudes, which means that there is less oxygen available for combustion. As a result, the furnace has to work harder to produce the same amount of heat, which can lead to decreased efficiency and increased wear and tear on the unit.

High-efficiency furnaces are designed to recover more of the heat from the combustion process resulting in lesser flue gas temperature compared to standard furnaces.

Should be tested monthly. This is to ensure that the valves are working properly and will open if the pressure in the boiler gets too high.

Solid fuels such as coal, wood, and biomass are generally less efficient than liquid fuels such as oil and gas. This is because solid fuels have a lower energy density and high moisture content.