H is for Heating
• Types of Boilers
— Steam
— Water
• Boiler Pressures
— Low
— High
• Boiler Fuels
— Natural Gas
— Oil
— Coal
— Electricity
• Boiler Configurations
— Fire Tube
— Water Tube

• Furnace Fuels
— Natural Gas
— Oil
— Coal
— LPG (Liquid Petroleum Gas)
— Electricity

Heating Coils
• Types of Heating Coils
— Steam
— Water
— Electrical

V is for Ventilation for each of the following:
1) Approximately 20 cfm (cubic feet per minute) of air volume per person of outside air (OA) for ventilation for non-smoking areas.

2) Make-up air (MUA) for exhaust systems such as:
— Kitchen hoods
— Fume hoods
— Toilets

3) Room (conditioned space) pressurization — +0.03 to +0.05 inches of water gage for commercial buildings

AC is for Air Conditioning
For most of us, air conditioning means comfort cooling with either chilled water systems or refrigerant systems. Both of these systems include cooling coils to remove heat from the air.

• Chilled Water Systems
— Vapor-compression system
— Absorption system

• Refrigeration (DX) Systems
— Vapor-compression system

• Cooling Coils
— Water coil
— Refrigerant (DX) coil

Cooling and heating coils are heat transfer devices or heat exchangers. They come in a variety of types and sizes and are designed for various fluid combinations: water, refrigerant or steam. Water coils are used for heating, cooling or dehumidifying air and are most often made of copper headers and tubes with aluminum or copper fins and galvanized steel frames.

AC (Air Conditioning) also means conditioning the air in the following ways:
• Temperature (tempering the air) Cooling (removing heat)

Heating (adding heat)
• Humidity control
— Dehumidifying (removing moisture)
— Humidifying (adding moisture)
• Volume of airflow
— cfm (cubic feet per minute)
• Velocity (speed) of airflow
— fpm (feet per minute)
• Cleaning
— Filtering
• Pattern of airflow
— Direction
• horizontal
• vertical

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