HumidCalc

Name: HumidCalc
Rating: 5 (1 reviews)
Author: yoshihito sakagami

Precision Moist Air Calculator

Only for iPhone

Free · Designed for iPhone

1 Rating
Ages

4+
Years
Category

Weather
Developer

yoshihito sakagami
Language

EN
+ 2 More
Size

11.1
MB

iPhone

Accurately calculates humidity and dew point using numerical analysis. Ideal for HVAC, building management, and agricultural applications. ＊Weather data supported＊ A versatile humidity calculation app for everyone from general users to engineers — also suitable for agricultural applications. This app allows you to easily calculate indicators such as the Discomfort Index, WBGT (estimated heat stress index), Volumetric Absolute Humidity (an important indicator for influenza prevention), and Humidity Deficit (HD) used in agriculture, using weather data. You can also calculate a wide range of air properties from dry-bulb temperature (normal air temperature) and wet-bulb temperature obtained from ventilated psychrometers such as the Assmann psychrometer. Atmospheric pressure can be entered manually. The app supports 11 indicators across 15 calculation items, and unit conversion between Celsius/Fahrenheit and SI/Imperial units can be performed instantly by switching the temperature unit setting. ■ High-Precision Calculation Engine This app uses the Wexler–Hyland equations combined with numerical analysis, enabling highly accurate and stable calculations across a wide range of environmental conditions. ■ Calculable Indicators * Dew Point Temperature * Frost point tempreature * Relative Humidity * Humidity Ratio(Absolute Humidity) * Mass-based absolute humidity * High-resolution mass-based absolute humidity * Volumetric absolute humidity * Humidity Deficit (HD) * Vapor Pressure Deficit (VPD) * Enthalpy * Specific Volume * Equilibrium Vapor Pressure * Partial Pressure * Boiling Point of water * WBGT (estimated value) * Discomfort Index (DI) Supplementary Notes on WBGT & Discomfort Index Outdoor WBGT is defined as: WBGT = 0.7 Tnw + 0.1 Td + 0.2 Tg Since globe temperature (Tg) is not an input parameter, it is estimated from dry-bulb temperature (Td) using: Tg = 1.45 Td − 27.162 (°F) Td and Tg show a strong correlation (n = 17,376, R² = 0.919). Natural wet-bulb temperature (Tnw) is obtained by converting the measured wet-bulb temperature from an Assmann psychrometer to natural conditions, assuming a wind speed of 0.5 m/s (1.64 ft/s) or less. Details of this conversion algorithm are omitted. The Discomfort Index (DI) is calculated as: DI = 0.4 × (Td + Tw) + 15 (°F). ■ Weather Data & Sensors By tapping the Weather Data button, you can obtain current atmospheric pressure, dry-bulb temperature, and wet-bulb temperature. On devices equipped with a barometric pressure sensor, pressing the MEAS button allows direct pressure measurement. Wet-bulb conditions can be set to Normal or Frozen (effective below freezing). Corrected values can also be displayed for non-ventilated psychrometers such as the August psychrometer (ventilated types recommended for accuracy). ■App Ecosystem Integration You can directly receive calculated dry-bulb and wet-bulb temperatures from the companion app “Calculator of Air”. (Please note that calculations must be performed in Calculator of Air before data can be transferred.) By combining HumidCalc with Calculator of Air, you can, for example, derive multiple air properties from known dry-bulb temperature and relative humidity values. ■Input Ranges * Dry-bulb & wet-bulb temperature: −30°C to 50°C (−22°F to 122°F) * Atmospheric pressure: 600 hPa to 2475 hPa (17.72 inHg to 73.09 inHg) ■Data Source This app uses OpenWeatherMap data (CC BY-SA 4.0). ■Notes When using an August psychrometer, calculations assume an air velocity at the sensing element of 0.5 m/s or less. As a result, calculated values may differ from those listed in humidity tables included with commercial August psychrometers. ■Disclaimer 1. Please use values within reasonable temperature ranges (approximately 0°C to 40°C / 32°F to 104°F). Extremely unusual inputs may produce inaccurate results. 2. While every effort has been made to ensure high precision, minor errors may occur due to floating-point limitations. 3. The developer assumes no responsibility for any damages resulting from the use of this app.

Ratings & Reviews

5.0

out of 5

1 Ratings

Good features, needs more info
04/15/2017

Tx9753
First I wish there was a paid option to not have ads. More importantly, I like the specific features but need more background on how some things are calculated. WBGT is 'estimated' but how? That is far from easy to do right. And what is the discomfort index reported? And there is no way to ask . Developer, please consider an update with info, And perhaps an ad free upgrade, and a way to ask such questions.Update (4/5/17): developer responded via App Store, thanks! But still have questions: how is WBGT estimated, and what discomfort index is used? Thank you.Update: 4/15/17. Thank you to the developer for the details on the wbgt estimation. The globe temperature is the hardest to accurately estimate, but thank you for listing your equation. Also thanks for listing the discomfort index equation in your app. I appreciate your support and use your app. Excellent post script- I give 5 stars now.

Developer Response
(4/11/17)Dear Tx9753.Thank you for your new question.I am sorry for the copy and paste from Description of the AppStore, this is the answer to your question.That’s because of my Japanese people,my not good at English. There may have been a strange part in sentence expression, apologize about this matter. At the risk of repetition, thank you for your comment. From the developers of this app. ★★ Supplementary explanation about the WBGT(Estimated value) and the Discomfort index. ★★The calculation formula of the outdoor WBGT is "WBGT = 0.7 Tnw + 0.1 Td + 0.2 Tg", but since there is no entry item Globe thermometer temperature (Tg) in this application, estimation the Globe thermometer temperature(Tg) by Dry-bulb temperature (Td).- Calculation formula: "Tg = 1.45 Td - 27.162 [Temperature unit: ℉]”There is a very strong correlation between Globe thermometer temperature (Tg) and Dry-bulb temperature (Td).[Statistical information on this correlation : The number of samples is 17376 and the coefficient of determination(R^2) when statistics are taken is 0.919]For Natural wet-bulb temperature (Tnw), Convert the Wet-bulb temperature(Tw) obtained by measurement by Assmann psychrometer to the Wet-bulb temperature(Tw) measured in natural state, a use it as Natural wet-bulb temperature (Tnw).The natural state here means that the wind speed at the time of measurement is 5 meters per second(16.4 feet per second) or less.The algorithm of this conversion is very special, so we omit the explanation."Discomfort Index" is "Temperature-humidity index".The calculation formula is "Discomfort Index[DI] = 0.4 × (Td + Tw) +15 [Temperature unit: ℉]". (4/5/17)Dear Tx9753.Thank you for your comment.You about the matter pointed out is wrote the answer on the Description section in the AppStore.Could you please view it if you don’t mind?I am sorry to you, but there is no plan for will change to paid application.Because of my Japanese people,my not good at English. There may have been a strange part in sentence expression, apologize about this matter.At the risk of repetition, thank you for your comment.From the developers of this app.
Good features, needs more info
04/15/2017

Tx9753

First I wish there was a paid option to not have ads. More importantly, I like the specific features but need more background on how some things are calculated. WBGT is 'estimated' but how? That is far from easy to do right. And what is the discomfort index reported? And there is no way to ask . Developer, please consider an update with info, And perhaps an ad free upgrade, and a way to ask such questions.Update (4/5/17): developer responded via App Store, thanks! But still have questions: how is WBGT estimated, and what discomfort index is used? Thank you.Update: 4/15/17. Thank you to the developer for the details on the wbgt estimation. The globe temperature is the hardest to accurately estimate, but thank you for listing your equation. Also thanks for listing the discomfort index equation in your app. I appreciate your support and use your app. Excellent post script- I give 5 stars now.
Developer Response 04/14/2020
(4/11/17)Dear Tx9753.Thank you for your new question.I am sorry for the copy and paste from Description of the AppStore, this is the answer to your question.That’s because of my Japanese people,my not good at English. There may have been a strange part in sentence expression, apologize about this matter. At the risk of repetition, thank you for your comment. From the developers of this app. ★★ Supplementary explanation about the WBGT(Estimated value) and the Discomfort index. ★★The calculation formula of the outdoor WBGT is "WBGT = 0.7 Tnw + 0.1 Td + 0.2 Tg", but since there is no entry item Globe thermometer temperature (Tg) in this application, estimation the Globe thermometer temperature(Tg) by Dry-bulb temperature (Td).- Calculation formula: "Tg = 1.45 Td - 27.162 [Temperature unit: ℉]”There is a very strong correlation between Globe thermometer temperature (Tg) and Dry-bulb temperature (Td).[Statistical information on this correlation : The number of samples is 17376 and the coefficient of determination(R^2) when statistics are taken is 0.919]For Natural wet-bulb temperature (Tnw), Convert the Wet-bulb temperature(Tw) obtained by measurement by Assmann psychrometer to the Wet-bulb temperature(Tw) measured in natural state, a use it as Natural wet-bulb temperature (Tnw).The natural state here means that the wind speed at the time of measurement is 5 meters per second(16.4 feet per second) or less.The algorithm of this conversion is very special, so we omit the explanation."Discomfort Index" is "Temperature-humidity index".The calculation formula is "Discomfort Index[DI] = 0.4 × (Td + Tw) +15 [Temperature unit: ℉]". (4/5/17)Dear Tx9753.Thank you for your comment.You about the matter pointed out is wrote the answer on the Description section in the AppStore.Could you please view it if you don’t mind?I am sorry to you, but there is no plan for will change to paid application.Because of my Japanese people,my not good at English. There may have been a strange part in sentence expression, apologize about this matter.At the risk of repetition, thank you for your comment.From the developers of this app.

- Added support for iOS 15.6 and later. - Updated to comply with the privacy requirements introduced in iOS 14 (IDFA and App Tracking Transparency). - Optimized the UI for 6.5-inch displays on iPhone X and later models. - Updated the AdMob advertising SDK. - Added calculation and display support for frost point temperature. - VPD (Vapor Pressure Deficit) is now displayed alongside humidity deficit values. - Improved the numerical analysis algorithms, resulting in faster calculations and accurate computation of relative humidity and dew point even at extremely low temperatures (below -238°F / −150 °C). (For temperature inputs below −22°F(−30 °C), please use the companion app “Calculator of Air”.) Please note: This version is not compatible with older versions of the companion app “Calculator of Air” (version 1.1.4 or earlier). Users who rely on app integration are kindly requested to update “Calculator of Air” to version 1.1.5 or later.

Version 1.1.8

23h ago

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