# HumidCalc

by yoshihito sakagami

You can easily obtain "Temperature-humidity index(Discomfort Index)","WBGT(Heat stroke index)","Dew point temperature" etc from weather information.

### App Details

Version
1.1.5
Rating
NA
Size
7Mb
Genre
Weather Productivity
Last updated
December 23, 2017
Release date
July 19, 2016

### App Store Description

You can easily obtain "Temperature-humidity index(Discomfort Index)","WBGT(Heat stroke index)","Dew point temperature" etc from weather information.
Other, from the dry-bulb temperature(Td) and the wet-bulb temperature(Tw) obtained from the ventilated psychrometer such as Assmann psychrometer, it is an application for calculating each index on the air. You can also enter the atmospheric pressure.
11 indicators and it is possible to calculate the 13 items. Conversion to the Celsius temperature and SI units also, you can simply by switching of "Temperature Unit".
Calculation can be indicators are as follows.

- Dew Point Temperature
- Relative Humidity
- Humidity Ratio(Absolute Humidity)
Weight absolute humidity
Weight absolute humidity in the finer unit
Volume absolute humidity
- Humidity Deficit
- Enthalpy
- Specific Volume
- Equilibrium Vapor Pressure
- Partial Pressure
- Boiling Point of Water
- WBGT(Estimated value)
- Discomfort Index

(( 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: ℉]". ))

You can get the current atmospheric pressure and dry-bulb temperature(Td), the wet-bulb temperature(Tw) by pressing the "Weather" information button. In iPhone6 and iPhone6Plus "MEAS" button to get the pressure from the pressure sensor by pressing is also possible.
Conditions of the wet bulb is you can choose any one of the “Normal" or “Froze” (※ If you select the “Froze”,setting is enabled in when if sub-zero in wet-bulb temperature(Tw) ).
Even if you enter the measurement value, such as a non-draft type of Augusto psychrometer, you can display the index that corresponds at the touch of a button one (※ This application is subject to the use of ventilation type psychrometer from the point of view of measurement accuracy ).
The calculated value of the dry-bulb temperature(Td) and the wet-bulb temperature(Tw) in the sister app “Calculator of Air”,this app can receive direct (※ There is a need to start up the "Calculator of Air" first). For example, you want to know the indicators of various air using the dry-bulb temperature(Td) and relative humidity, you can deal with this way.
Input range is the temperature is -30 ℃ to 50 ℃ (-22 ° F to 122 ° F).
Input range is the atmospheric pressure is 600 hPa to 2475 hPa(17.72 inHg to 73.09 inHg).

This application is using the OpenWeatherMap(CC BY-SA4.0).

Disclaimer: 1. be used by entering a number in line with common sense as much as possible temperature range (0 ℃ to 40 ℃ position / 32°F to 104°F position). If you enter an extreme value correct calculation result may not appear.
Disclaimer 2. We are not liable for any damage caused by the use of this application does not bear all of the responsibility.

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