Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

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HVAC Systems

Heating, ventilation and air conditioning systems - design and dimensions.

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Ventilation

Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Air Conditioning

Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.

Heating

Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more.

Noise and Attenuation

Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.

Air - Humidifying with Steam, SI units

Using steam to humidify air.

Air Ducts - Sizing

Required duct area vs. air flow.

Dehumidification - Removing Moisture from Air

Dehumidifying by cooling, adsorption or absorption.

Ducts or Pipes through Steel Joists - Maximum Sizes

Maximum sizes of ducts or pipes through K series joists.

Fuels - Combustion Air and Flue Gases

Combustion air and flue gas for common fuels - coke, oil, wood, natural gas and more.

Fuels - Exhaust Temperatures

Exhaust and outlet temperatures fuels like natural gas, liquefied petroleum, diesel and more.

Fuels - Higher and Lower Calorific Values

Higher and lower calorific values (heating values) for fuels like coke, oil, wood, hydrogen and others.

Fuels and Chemicals - Autoignition Temperatures

Autoignition points for fuels and chemicals like butane, coke, hydrogen, petroleum and more.

Heat, Work and Energy

Heat vs. work vs. energy.

HVAC Abbreviations

Commonly used HVAC abbreviations.

HVAC Diagram - Online Drawing Tool

Draw HVAC diagrams online with this Google Drive drawing tool.

HVAC Terms

Common HVAC industry terms like absolute humidity, pressure, temperature and more.

Indoor Temperature and Humidity Loads

Calculate sensible and latent heat from persons, lights, electric equipment, machines, evaporation from water surfaces, polluting fluids and miscellaneous loads.

Moisture Transport through Walls and Roofs

Moisture will flow through a building wall or roof if the vapor partial pressure is higher on one of the sides.

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Natural Gas - Consumption of Equipments

Natural gas consumption for equipment like boiling pans, ovens, cookers, kettles and more.

Optimal Combustion Processes - Fuel vs. Excess Air

Stable and efficient combustion requires correct mixture of fuels and oxygen.

Outdoor Temperatures and Relative Humidity - US Winter and Summer Conditions

Outdoor summer and winter design temperatures and relative humidity for US states and cities.

Ventilation Systems - Acoustic Calculation Procedure

Acoustic noise calculation procedure HVAC systems.

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Unit Converters

Temperature

oC
oF


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Length

m
km
in
ft
yards
miles
naut miles


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Area

m2
km2
in2
ft2
miles2
acres


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Volume

m3
liters
in3
ft3
us gal


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Weight

kgf
N
lbf


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Velocity

m/s
km/h
ft/min
ft/s
mph
knots


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Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


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Flow

m3/s
m3/h
US gpm
cfm


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