Thermal Comfort Tester

Instrument Introduction:

JT2180It is a portable environmental thermal comfort tester that integrates sensors for temperature, humidity, wind speed, black bulb temperature, wet bulb temperature, etc. It complies with the PMV and PPD index algorithms of ISO7730. Simultaneously integrated with PM2.5 and CO2 sensors, serving as important reference indicators for indoor air quality testing.

This instrument is the latest version upgraded based on more than ten years of experience in the development of comfort meters at Jiantong Technology. It has the function of expanding noise and illumination, as well as remote wireless transmission. Remote data management can be achieved through the "Jiantong Cloud Platform", and remote data can be accessed in real time through web pages or WeChat mini programs, greatly facilitating users' off-site or long-term measurement needs.

What is thermal comfort:

Thermal comfort is a subjective satisfaction evaluation of the surrounding thermal environment by humans (ISO 7730), mainly divided into three aspects: physical, physiological, and psychological.

The evaluation indicators mainly include Bayesian scale, ASHRAE scale, and ISO standard.

JT2180 adopts the ISO standard evaluation method (corresponding to China: GB/T18049).

ISO has developed the ISO 7730 standard based on the research results of Professor P.O. Fanger from Denmark. In the ISO 7730 standard, the PMV-PPD index is used to describe and evaluate the thermal environment. This indicator comprehensively considers six factors, including human activity level, clothing thermal resistance, air temperature, air humidity, average radiation temperature, and air flow velocity, to satisfy the human thermal balance equation. The subjective sensation level of the vast majority of people is determined through sensory testing. The above research results and corresponding standards form the basis for designing comfortable thermal environments in the future.

PMV index:

Predicted Mean Vote

PMV stands for Predicted Mean Vote, which predicts the average number of votes cast.

PMV value is an evaluation index proposed by Professor P.O. Fanger from Denmark to characterize human thermal response (cold and hot sensation), representing the average cold and hot sensation of most people in the same environment. The PMV-PDD thermal comfort model is the earliest mathematical model for human body temperature regulation, which has seven levels of sensation, namely:

Cold (-3)//Cool (-2)//Slightly cool (-1)//Neutral (0)//Slightly warm (+1)//Warm (+2)//Hot (+3).

PPD index:

Predicted Percentage of Dissatisfied

The full English name of PPD is prsdicted percentage of dissatisfied individuals

The PPD index is the average voting value of the population expected to be dissatisfied with the thermal environment. The PPD index can predict whether a group feels too warm or too cold, "according to a seven level heat sensation poll.

JT2180Calculated indicators: PMV、PPD、Ta、Tg、Tnw、RH、Va、DR、Td、Tu、tr、WBGT、IREQ、DLE、RT、WCI Wait.

JT2180Equipped with a built-in 4G wireless network card and including 1 year of free data usage, JT2180's measurement data can be transmitted in real-time to the "Jiantong Cloud Platform" through this card. You can access real-time data or download historical data at any time through the web or using our provided WeChat mini program (supporting downloading historical data from the past 1 year).

Typical applications:

In the development of high-speed trains, due to the increase in operating speed and the demand for train service quality, the thermal comfort requirements inside the train have also correspondingly increased. By using the PMV-PPD index in the ISO7730 standard to evaluate the thermal comfort inside the high-speed train passenger compartment, a recommended range of set values that meet the requirements for thermal comfort inside the train will be obtained. In the physical factor testing of GB/T 18204.1 "Public Place Hygiene Testing Method" in China, it is stipulated that the PMV value of comfort in public places should be measured and evaluated according to the method of GB/T 18049. For densely populated public places including shopping malls, subway stations, airports, high-speed railway stations, etc., comfort testing can be used to adjust air conditioning equipment in real time, quickly improve the spatial environment, and achieve energy-saving optimization.

JT2180Thermal Comfort TesterPartial sensor measurement parameters:

Black sphere temperature: -20 ℃~85 ℃; ±0.5°C

Wet bulb temperature: 5-60 ℃; ± 0.5 ℃ (anhydrous wet bulb/calculated value, only used for calculating WBGT index) Relative humidity: 10-90% RH; ± 3% RH

Air temperature: -20 ℃~85 ℃; ±0.5℃

Air flow velocity: 0.05-2.0m/s ± (0.05m/s+2% reading); 2.0-5.0m/s ± (0.1 m/s ± 2% reading)

Data analysis software:

JTSOFT-IAQ standalone version

JTSOFT-IAQ is a standalone processing software specifically developed for the JT2180 comfort tester. This software has functions such as data export, data analysis, data editing, result calculation, report output, curve output, etc. It is based on WIN7 or above operating system and is a professional evaluation software. According to relevant standards and theories, evaluation indicators for hot, comfortable, and cold environments can be calculated and analyzed. And there is a corresponding evaluation report output.

The report can be edited with basic information such as testing location/time/testing personnel information.

The content of the report lists the basic data summary and statistical data of the test project, which can be directly exported as a PDF file. The output content of the data report depends on the data segment selected by the user.

By logging in to the Jiantong Cloud Service Platform through PC or mobile, users can perform device management, data management, data viewing, permission settings, project management, and other operations.

By scanning the QR code attached to the machine through WeChat, you can enter the Jiantong Cloud Service WeChat Mini Program. By entering with your account password, you can view the device status, real-time data, and historical data. At the same time, the platform will issue device status (disconnection) warning notifications through SMS or email.