Thermo Labo

The sensation of coldness or warmth when skin touches a fabric is referred to as the “coldness and warmth feeling.” The feeling of coldness or warmth will vary depending on the amount of heat transferred from the skin to the fabric. This device measures that feeling by evaluating the “q max” value (peak heat flux).

The KES-F7 Thermo Labo can be used to evaluate such products as bedding material meant to offer a feeling of coldness in summer, and underwear material meant to offer contact warmth in winter.

● A design that mimics the sensation of actually touching an object

The load and contact area of the KES-F7’s heat plate, which is brought into contact with the target sample, is designed to imitate the sensation of touching an object by hand, allowing for more realistic measurements of maximum heat transfer amounts.

● Also measure thermal conductivity and heat retention properties (with optional accessories)

Thermal conductivity:
With constant thermal conductivity measurement, the ease at which heat is transmitted from a heat plate with a constant temperature (30°C) through a sample to a heat plate with a separate constant temperature (20°C).
Heat retention properties:
(optional accessory)
The sample is set on a heat plate with a constant temperature (room temperature +10˚C) and is left in contact with the air. A constant wind is then applied continuously to the sample surface. The amount of heat lost through the sample is then measured in order to calculate the heat retention rate (%). Measuring methods include a dry method that assumes direct contact is made with dry skin or clothing and a wet method that assumes contact is made with sweaty skin or clothing.

Measurement Example

  • Evaluation of a padding’s feeling of coolness
  • Coolness of cooling sheets
  • Thermal sensation measurement for underwear
  • Automotive interior product texture evaluation
  • Evaluation of refreshing properties of cosmetics

Thermo Cool (cooling base)

  • This compact cooling base allows for constant control of the base temperature of a measurement sample. Temperatures are kept constant electrically to prevent temperature variations and ensure good thermal properties in the measurement data. This device can be used instead of the water box.

F7 — q max (Coldness/warmth feeling)

F7 — Thermal conductivity

Thermo Labo
System Configuration Diagram / Measurement Data

Sample Measurement Software Screens

▲ Thermal Properties (q max)

Obtainable Data

Item Characteristic value Description Reading the data
Thermal Properties q max Peak heat flux (with selection switch set to Cool)
Higher values mean a colder feeling
k Thermal conductivity Higher values mean heat is more easily transferred
% Heat retention properties Higher values mean higher heat retention properties
  • USB Auto Data Processing Unit (optional)

    Connecting this device to the instrument and to a PC allows the waveforms and numerical values of measurement data to be output.
    Obtained data can be saved as BIN data or CSV data.

KES (Kawabata Evaluation) SYSTEM

The Kawabata Evaluation System, centered on Sueo Kawabata, a professor at Kyoto University, and Masako Niwa, a professor at Nara Women’s University, is an objective evaluation method for measuring the texture of clothing fabrics based on the “The Standardization and Analysis of Hand Evaluation” provided by the Hand Evaluation and Standardization Committee of the Textile Machinery Society of Japan.

Thermo Labo
Dimensions/Weight (approx.)
Thermo Labo (q max / thermal conductivity measurement unit):
W230 × D360 × H80 (mm) / 3 kg
*With BT-box and T-box set on base plate
Electronic unit: W180 × D400 × H400 (mm) / 15 kg
Wind tunnel unit (heat retention property measurement)*:
W460 × D320 × H1100 (mm) / 7 kg
Wind tunnel amplifier unit: W140 × D240 × H180 (mm) / 2.5 kg
Thermo Cool: W180 × D180 × H110 (mm) / 2.5 kg
Thermo Cool amplifier W230 × D310 × H220 (mm) / 5 kg
Power source 100 VAC
(Thermo Labo unit) Max. power consumption: 50 W
(Wind tunnel unit) Max. power consumption: 20 W*
(Thermo Cool unit) Max. power consumption: 20 W
Measurement environment temperature and humidity 20 to 30°C / 50 to 70% RH
(No condensation.) Temperature and humidity kept constant during measurement.
(Standard temperature and humidity conditions: 20°C / 65% RH)
*Installation should be in a location with minimal influence from wind or vibrations.
Measurement unit configuration T-Box: (T-plate 3 × 3 cm)
5 cm BT-Box: (BT plate5 × 5 cm)
10 cm BT-Box: (BT plate 10 × 10 cm)*
Temperature display Unit: Degrees Celsius
Min. display: 0.1°C
Upper limit of usable temperature: 40°C
Evaluated coldness/warmth feeling value q max [W/cm2]
Heater control method Output in voltage proportional to temperature difference
Heat-loss display Max. usable range (200 mW range): Approx. 200 mW
Max. usable range (2 W range): Approx. 2 W
Max. usable range (20 W range): Approx. 10 W
*Do not use the 200 W range.
Measurement range Thermo Labo unit: Max. 10 W
(stable measurable range: 3 W (1.2 kW/m2) or less)
Wind tunnel speed: Max. 1 m/sec*
Thermo Cool: Min. temperature setting (5°C) to room temperature
Specimen size Dimensions: 20 × 20 cm, Thickness: 2 mm (max.)
*Optional accessory: Wind tunnel device specification (heat retention property measurement)
*Specification details recorded here are subject to change without notice. We appreciate your understanding.
Thermo Labo
[Medical products] Cooling sheets, etc.
[Cosmetics] Feeling of coldness and warmness of creams, lotions, etc.
[Fabrics & textiles] Interior fabrics, feeling of coldness and warmness for underwear, etc.

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