fbpx
24.11.2020 Publications

How to ensure healthy air at home? Part 1

Modern residences and apartments are airtight premises furnished with furniture, various home appliances and office equipment, carpets and other household items. Such an environment provides comfortable, but not always safe living conditions. Air in such premises fairly quickly becomes moisturized and absorbs a large amount of volatile organic compounds originating from different sources. Moreover, any person present in such premises actively fills the air with carbon dioxide by simply breathing, which together with other factors significantly decreases the quality of the air indoors and in the long run poses a serious threat to health. Modern ventilation systems provide a solution to this problem by ensuring proper air exchange. Such systems are guided and prompted to operation and to selection of proper operation mode by air quality sensors. In this series of articles, we will talk about such sensors in more detail.

What does “comfort at home” and “cosiness” mean to us? Well, for starters, it probably means warmth, which is especially important during the cold season of a year. That is why modern insulated glazing is so popular among people and is used almost in each building because it shields our homes from outside cold air and harsh weather. However, it so happens that sometimes when we gain advantages in something, we also lose at the same time in sьomething else. Insulated glazing make our homes very airtight. In terms of saving heat, it is certainly a plus, but in terms of ventilation – it is a significant disadvantage. Insufficient ventilation and constant presence of people in a room makes air there unsuitable for proper dwelling very quickly because oxygen content decreases and carbon dioxide increases, it becomes more humidified and various odours and unwanted impurities appear.

Naturally, such air even in the warmest building cannot provide its residents sufficient comfort and cosiness, and something must be done about it. But how can one solve a problem that they cannot see or feel? After all, a person can feel with its body if the temperature is out of the comfortable range and do something about it, but when it comes to air quality, things get a bit more complicated. In most cases, one cannot recognize bad air quality until headache appears and overall wellbeing worsens. How do we identify the level of air pollution and the moment when we need to do something about it? Now this is the task of sensors designed for controlling such air parameters as humidity, concentration of carbon dioxide, volatile organic compounds, etc.

Part one: Humidity and humidity sensors

This is one of the main parameters of the microclimate in a room. Relative humidity is increased due to vapour generated when cooking, taking a bath or a shower, and when room temperature decreases (it often happens in autumn before the heating season starts and in spring after it ends). Any person is also a source of humidity that they generate through breathing and by evaporation of liquids from the body, which in turn also contributes to an increase of vapour concentration in the air. In an insufficiently ventilated premises, humidity level is constantly increasing and it leads to problems for people who dwell there.

Among such problems we should highlight appearance and spread of mould (fungi). Relative humidity above the normal value (over 60 %) and under moderately warm temperatures (from +18 to +25°С) creates ideal conditions for reproduction of these harmful microorganisms. Small and almost inconspicuous mould stains in places of increased humidity may lead to serious health problems. Mould discharges a large amount of spores sized 2–8 µm into the air, which when entering lungs cause an allergic reaction and may lead to a number of illnesses such as rhinitis, pharyngitis, bronchitis, asthma episodes, etc. The products of mould metabolism come as strong poisons that can cause poisoning, development of liver and lung cancers, cardiovascular pathology, and damage to the central nervous system. Moreover, the fungi can cause various skin diseases, which are manifested in the form of dermatitis and other inflammatory processes. Being subjected to continuous effect of moulds, the immune system of a person is slowly but gradually loses its strength.

Increased air humidity is also harmful for furniture because it makes it saturated with excess humidity, damp and leads to it losing its useful qualities.

However, very dry air with low humidity is also harmful. Often such air is present during cold seasons. When temperature decreases, the dew point also decreases, which results in moisture condensation on various objects and making air more dry. At negative temperatures, moisture crystallizes and precipitates on the ground and various surfaces. As a result, air with decreased humidity level enters our homes, which requires additional humidification. Moreover, when entering a warm room (which is especially relevant during heating season), it warms up and becomes even more dry. The thing is that warm air, as opposed to cold air, can contain more moisture, therefore, as the temperature rises, the ratio of the amount of moisture present to the maximum possible amount at a given temperature decreases. This ratio is an expression of the air relative humidity, which will decrease with increasing temperature, creating a feeling of excessive dryness for a person. When relative humidity is low (less than 40 %), even healthy people may feel discomfort, drowsiness, itching and irritation of the skin. Excessively dry air leads to drying out of the mucous membrane of the respiratory tract and aggravates the course of respiratory diseases, which especially affects children.

SOLUTION. Humidity sensors (hygrometers) and temperature and humidity sensors (thermohygrometers) are used for measuring moisture content in the air. These devices are used in private residences and apartments, commercial and educational facilities, medical institutions, etc. Many modern domestic fans are equipped with such sensors by default, which allows ventilation equipment to turn on and change operating modes contingent on air humidity and temperature readings, therefore maintaining these important microclimate parameters within the normal range.

The electro-mechanical humidistats VENTS HR-S are designed for controlling humidification and dehumidification in ventilation, air conditioning and heating systems. They can also be used to alarm when the humidity exceeds or falls below a pre-set level. The humidistat is designed for indoor mounting on the wall surface. The device uses a synthetic element as sensor medium. The synthetic element stretches as the humidity increases and shrinks as the humidity decreases.

The DPWC11200 humidity and temperature sensor has a wider functionality, which is intended for temperature and humidification control in air ventilation, air conditioning and heating systems. The sensor is also mounted onto a wall and has 2 analogue outputs (0-10 V and 4-20 mA) that allow stepless fan speed control (which requires an EC motor fan). With stepless control the fan speed is changed in proportion to the humidity and temperature level. Relay and analog outputs make the sensor compatible with almost any ventilation system.

To be continued…

Read more

8 Jul 2021

World-class ventilation

26 May 2021

Scientists recognize the leading role of ventilation in the fight against the spread of COVID-19

29 Apr 2021

How to ensure healthy air at home? Part 3

10 Feb 2021

Ventilation of the Georgian clinic is provided by VENTS equipment

29 Dec 2020

How to ensure healthy air at home? Part 2

16 Nov 2020

Vents ventilation solutions around the world

3 Jun 2020

Clean air safeguards against virus diseases

6 May 2020

Ventilation in mobile hospitals: international experience and ventilation solutions

25 Jun 2019

Expanded polypropylene: the benefits of a high-tech material

19 Oct 2015

KAM fireplace fan: efficient heating control for your home

6 Aug 2014

Antibacterial Coating of VENTS Ventilation Products: Say ‘No’ to Germs!

26 Jun 2014

VENTS – A social stability guaranty

27 Mar 2014

Hydroponics ventilation basics

14 Mar 2011

Regulated air exchange and energy saving

23 Feb 2011

HARDI and ASHRAE magazines about VENTS products

20 May 2010

Ukrainian manufacturer with international name

23 Feb 2010

Advantages of the Ventilation

28 Nov 2008

“VENTS”’s Collection of Awards Replenished by New Order

22 Sep 2008

A solemn ceremony of awarding winners of “The Best Entrepreneur of the Year – 2008”

30 May 2008

“Records For The Sake of Life”

7 Feb 2008

JSC Ventilation Systems is the Leader of the Branch 2007

18 Sep 2007

Choice of the Year – 2007

5 Mar 2007

VENTS – fashion maker in ventilation

7 Feb 2007

“Race under Chestnuts”

5 Feb 2007

A new website for the American customers

21 Nov 2006

The action from VENTS

26 May 2006

DIY in Europe

9 Oct 2005

JSC Ventilation Systems is the Leader of the Branch 2005

Submit
Do you find our newsfeed helpful to track our events?

results

Loading ... Loading ...
July 2021
S M T W T F S
« May    
 123
45678910
11121314151617
18192021222324
25262728293031