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

Physiology

Human physiology, air quality and comfort temperatures, activity and metabolic rates, health effects of carbon monoxide and more.

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Age and Physical Growth - Weight and Height

Age and typical physical growth of boys and girls - age 2 to 18 years.

Air Contaminants - Exposure Limits

Exposure limits for various air contaminants.

Ammonia - NH3 - Concentration in Air and Health Effects

Ammonia and health symptoms - smell and threat to life.

Blood Sugar Units

Convert between blood sugar units.

Bodies - Weight vs. Height

Typical ideal body weight versus height.

Carbon Dioxide Concentration - Comfort Levels

CO2 acceptance and comfort level.

Carbon Dioxide Concentration in Rooms Occupied with People

Carbon dioxide concentration in a room may indicate air quality and ventilation system efficiency.

Carbon Dioxide Emission from the Human Body vs. Activity

Carbon Dioxide emission from persons vs. activity.

Carbon Monoxide and Health Effects

Exposure to Carbon Monoxide - CO and health effects.

Clo - Clothing and Thermal Insulation

Clo is used as a measure of clothes thermal insulation.

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Clothing, Activity and Human Metabolism

Human metabolism at low and high activity with different levels of clothing.

Discomfort Index

Comfort vs. dry bulb, wet bulb and dew point temperature.

Emissions from the Human Body

Gaseous polutants emissions from human bodies.

Food - Energy Content

Energy in carbohydrates, fats and proteins.

Food-borne Infections and Diseases

Common bacteria and viruses found in food.

Force, Power and Human Operated Machines

Maximum force or power available in human operated machines.

Gases - Dangerous Concentration Levels

Dangerous vs. tolerable concentration levels for some industrial gases.

Globe Temperature

The resultant or globe temperature.

Health vs. Relative Humidity

The optimum relative humidity ranges for bacteria, viruses, fungi, mites, asthma.

Heat Discomfort Zones

Maximum work load vs. temperature and relative humidity.

Heat Index

Equivalent heat index vs. air temperature and relative humidity - in degrees Fahrenheit and Celsius.

Human Body Composition

Composition of the human body.

Human Effects when Exposed to Low-Frequency Noise or Vibration

Physiological effects from low-frequency noise or vibrations.

Human Effort Levels - Energy and Heart Rates

Human work effort levels vs. energy expenditure and associated heart rates.

Human Heat Gain

Heat gain from persons in air conditioned spaces - in btu/hr.

Human Life Expectancy

Age and life expectancy for men and women.

Human Need of Air

Fresh air is required for respiration and for transport of heat and vapor emitted from the human body.

Humans - Required Rest Time

Relaxation rest time vs. working time and activity.

Illuminance - Recommended Light Levels

Working activities and light levels - required illuminance.

Legionella

The Legionella Pneumophila bacterium thrives in water supply systems and air conditioning systems - and may cause the Legionnairs disease.

Maximum Sound Pressure Levels in Rooms

Maximum recommended sound pressure levels in rooms like kindergartens, auditoriums, libraries, cinemas and more.

Met - Human Metabolic Rates

Metabiolic Rate - Met - is used as a measuring unit for human body heat or power production.

Metabolic Heat Gain from Persons

Human metabolic heat gain in air conditioned rooms.

Physiology - Activity and Metabolic Rates

Heat production from the human body vs. activity.

Predicted Mean Vote Index (PMV)

PMV index predicts mean comfort response of a larger group of people.

Recommended Relative Humidity

Recommended relative humidity level.

Required Building Space per Person

Room area per person - may be used to calculate typical indoor climate loads.

Sound - Hearing Threshold vs. Age

Shift in hearing threshold for men and women vs. age.

Sound Intensity, Power and Pressure Levels

Introduction to decibel, sound power, intensity and pressure.

Survival Time in Cold Water

Time to exhaustion and death for humans in cold water.

Wet Bulb Globe Temperature (WBGT)

The Wet Bulb Globe Temperature can be used to measure the general Heat-Stress index.

Wind Chill Index

Effective Temperature of air in movement.

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