Related Experiment Video
Updated: May 25, 2026

Thermal Behavior and Power Efficiency Comparison of AC vs. DC Electrical Heating in a Distillation Column Using Infrared Thermography Analysis
Published on: December 5, 2025
Evaluation of thermal overload in boiler operators
Camila Soares Braga1, Valéria Antônia Justino Rodrigues, Julio César Costa Campos
1Ergonomic Laboratory-Forest Engineering Department, Federal University of Viçosa, Minas Gerais, Brazil.
Boiler operators in Brazilian educational institutions face health risks from excessive heat exposure. This study found thermal overload conditions during boiler operations, highlighting the need for improved working environments.
Area of Science:
- Occupational Health and Safety
- Environmental Science
- Energy Engineering
Background:
- Educational institutions in Brazil have high energy demands, often met by wood-fired boilers.
- Boiler operation poses significant health risks to operators due to heat exposure and operational hazards.
Purpose of the Study:
- To analyze the thermal environment conditions for operators in a B category boiler at a Brazilian Higher Education Institution.
- To assess the risk of heat stress in the workplace.
Main Methods:
- Utilized WBGT (Wet Bulb Globe Temperature) meters, anemometers, and infrared thermometers to collect environmental data.
- Employed questionnaires to gather information on temperature, humidity, and air velocity.
- Focused on a B category boiler in the Zona da Mata Mineira region.
Main Results:
- The study identified thermal overload conditions during the evaluated period.
- Collected data on key environmental factors including ambient temperature, globe temperature, relative humidity, and air velocity.
Conclusions:
- The thermal conditions during boiler operation present a risk of heat stress to operators.
- Recommendations for improving the thermal environment and operator safety are implied.
Related Concept Videos
Thermal expansion and Thermal stress: Problem Solving
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Thermal Stress
Thermal Expansion
Thermal Strain
Assessing Body Temperature - Temporal Artery
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.
Step 3: Assess the patient's forehead...
Assessing Body Temperature - Oral
Step 1:
Start by practicing proper hand hygiene to prevent the spread of microorganisms.
Step 2:
Take the thermometer out of the charging unit, switch it on, and wait for the ready sign.
Step 3:
Gently slide the probe cover until a click is heard. This simple action prevents cross-contamination and ensures the correct placement of the probe cover.
Step 4:
Instruct the patient to open their mouth and place...

