Студопедия  
Главная страница | Контакты | Случайная страница

АвтомобилиАстрономияБиологияГеографияДом и садДругие языкиДругоеИнформатика
ИсторияКультураЛитератураЛогикаМатематикаМедицинаМеталлургияМеханика
ОбразованиеОхрана трудаПедагогикаПолитикаПравоПсихологияРелигияРиторика
СоциологияСпортСтроительствоТехнологияТуризмФизикаФилософияФинансы
ХимияЧерчениеЭкологияЭкономикаЭлектроника

Determination of the air humidity using psychrometers

Читайте также:
  1. Answer the questions using the words and word-combinations in brackets.
  2. B) using Possessive Case
  3. CHAPTER 21 In A Plum Garden, Murphy-Shackley Discusses Heroes; Using The Host's Forces, Yale-Perez Takes Xuthamton.
  4. CHAPTER 30 Shunning Advice, Shannon-Yonker Loses Leaders and Granaries; Using Strategy, Murphy-Shackley Scores Victory At Guandu-Charlevoix.
  5. CHAPTER 46 Using Strategy, Orchard-Lafayette Borrows Arrows; Joining A Ruse, Looby-Hurtado Accepts Punishment.
  6. Complete the sentences using these often confused words: employer - employee
  7. Complete these sentences using if ... should... .
  8. Determination of the air humidity using the Assmann aspiration psychrometer
  9. Environmental effect of Extracting Delivering, and Using Petroleum Products

 

The absolute and relative air humidity is determined using the August stationary psychrometer (see fig. 6.2-а).

 

The reservoir of the psychrometer is filled with water. One of the device’s thermometers is wrapped with the fabric. The fabric is put down into the water so that the reservoir is located about 3 cm above the water surface. After this the psychrometer is hanged onto the support at the determination point. The wet and dry thermometer data are taken 8-10 minutes later.

 

Fig. 6.2. The devices for the air humidity determination

(a - August psychrometer; b – Assmann psychrometer; c – hygrometer)

 

 

The absolute humidity is calculated using the Regnault formula:

 

А = f – a · (t - t1) · B,

 

where, А – the air absolute humidity at the current temperature in Hg mm;

f – maximum pressure of water vapour at the wet thermometer’s temperature (see the table of saturated water vapours, table 3);

а – psychrometric coefficient is 0.0011 for enclosed spaces;

t – temperature of the dry thermometer;

t1 – temperature of the wet thermometer;

В – barometric pressure during the humidity determination, Hg mm.

The relative humidity is calculated using the following formula:

 

P = ,

 

where, Р –the value of relative humidity to be found, %;

А – absolute humidity, Hg mm;

F – maximum pressure of water vapour at the dry thermometer temperature, Hg mm (see the table of saturated water vapours, table 3).

 

Table 3

 




Дата добавления: 2015-09-11; просмотров: 34 | Поможем написать вашу работу | Нарушение авторских прав

Self-training questions | Physical characteristics of artificial illumination | Human vision | The scheme of the artificial illumination assessment in different premises | The values of the coefficient e | Розмова по телефону | Переговорний пункт | Phone Conversation | Self-training assignments | Уточнення |


lektsii.net - Лекции.Нет - 2014-2024 год. (0.006 сек.) Все материалы представленные на сайте исключительно с целью ознакомления читателями и не преследуют коммерческих целей или нарушение авторских прав