Condensation

Condensation – one of the most common natural phenomena.

Condensation is most common during cold and humid periods. It appears by transforming the water contained in the room’s air into vapor liquid, and will result into water droplets on the cold surfaces of quarters. If persistent and untreated this phenomenon is accompanied by fungi (mold).

The condensation on the exterior of the glass is the result of a situation that may have the following causes:

  • poor space heating and / or ventilation;
  • a very humid room such as the kitchen or the bathroom ;
  • very low temperatures outside or high temperatures mixed with high humidity.

Inlaturarea neajunsurilor se poate face doar prin interventia asupra acestor parametri.

Condensation occurs when the air inside is saturated vapor, the amount that can be absorbed by a volume of air is temperature dependent. “Indoor air kills” is the title of a book published in Sweden. There is evidence to support the dramatic title of the book, as explained, by the co-author professor Anders Svensson.

Condensation is a physical phenomenon that can not be avoided and the causes of condensation on the inner surface of the construction elements are explained as follows:

All residences have water vapors. Measurements have established the following amounts:

  • breathing: a daily 1-2 liters vapors;
  • daily preparation of food: 2 liters of daily vapor in a household of 4 people
  • existing steam generating sources: household activities, bathing, washing (drying / ironing) laundry, aquariums, pools, reheating food etc: up to 3 liters for a group of 4 people;
  • 1 sq/m plant releases about 2 liters in 24 hours;
  • vapor emissions from various sources (g/h):
Hot shower2000
Boiling pot of water900
Cooker400
An active person’s breathing400
Covered pot with boiling water350
Hot bath300
5 kg of laundry200
Stove flame on low100
A person’s breathing100
Plate of hot food60
A person’s breathing during sleep50

Other forms in which water acts on buildings: water as rain, snow, or other weather elements influence the closing systems of the building (roof, walls, windows and doors, balconies), water used in the initial construction (wet plaster, concrete pouring mounted ceramic tiles, relatively recent work – freshly built walls, plastered, painted, take a long enough period to dry completely), water derived from hygroscopic humidity inside and outside, depending on the physical structure of the material of construction; biological water (breathing, sweating), etc..

Other sources of increased humidity in rooms: rainwater pipes passing through the apartments, permanent water leaks (untested systems, leaky pipes, toilet tanks without coverage, etc..).

Lack of uniform heating in all rooms of the residence: in rooms that are less heated (eg. Bedrooms) condense can appear on a cold day and on windows with insulating glass. This is because the space is cool at night and by breathing the air becomes saturated with water vapor. Rooms found on the north side of the house, particularly during harsh winters.

Improper location of heating sources: the location of heating sources should remove all cold areas inside a room, they are usually mounted next to windows or on the north of the room. There should be a connection between the size of the window and radiator. Lack of ventilation in a room is also a problem. There is also a connection between windows and the ventilation in a room. Oddly enough, one of the exceptional qualities of the double glazed windows that ensure a 100% tightness can lead (in some cases) to some trouble. Natural ventilation is canceled in the rooms that use these windows. Before using the double glazed glass windows, apartments with old wooden windows had natural ventilation. Remember: clean air is vital. The role of a ventilation system is to remove dust and to replace saturated air with fresh air. Minimum living conditions for a human in a closed space is to have enough oxygen (O2) and where to dispose of carbon dioxide (CO2). Normally a person consumes 20-25 l / h O2, when performing medium effort.

Improper installation of exterior and interior window sills: installation of interior window sills over radiators and using drapes or curtains of a dense material (also available over heating points) obstructing heat release and effective flow of hot air and can contribute to the emergence and development of condensation.

Poor thermal-insulation: the chamber’s wall temperature plays a decisive role in the phenomenon of condensation. In this respect, it is sufficient that a surface temperature that comes in contact with air can be below the dew point. Today every house exterior is insulated polystyrene

The influence of inadequate sealing: we recommend a proper joinery system using aluminum profiles or in case of the PVC joinery use multi-glazing with low emissivity (Low-E).

Improper design of a blank window: a window mounted very low in an attic will reduce the hot air flow.

Incorrect installation of a window: it happens when the windows are not fitted properly, then condensation may occur.

Building thermal bridges: a thermal barrier can be defined as an average good conductor of heat, which makes continuity (connection) between a point outside of an enclosure and an interior point of it. Thermal bridges are a source of discomfort and loss of energy. To prevent them there are a variety of systems. From basement to roof, the house should be treated.

“Condensation may occur on the outer surface of the insulating glass when the glass surface is colder than the air in the enclosure (see auto glass behavior). Condensation on the glass surface located inside is due, especially, when ventilation is poor, due to disruption of normal flow of the air inside, caused by curtains, blinds, window boxes, etc…also as a poor location of the heating elements . An important factor for condensation on cold surfaces is saturated vapor and air in specific premises (bathrooms, kitchens, bedrooms). The solution is represented by ensuring a fair and repeated ventilation of the room.” (According to the VISUAL QUALITY ASSESSMENT OF GLASS in Chapter IV).

Condensation – one of the most common natural phenomena.

Condensation is most common during cold and humid periods. It appears by transforming the water contained in the room’s air into vapor liquid, and will result into water droplets on the cold surfaces of quarters. If persistent and untreated this phenomenon is accompanied by fungi (mold).

The condensation on the exterior of the glass is the result of a situation that may have the following causes:

  • poor space heating and / or ventilation;
  • a very humid room such as the kitchen or the bathroom ;
  • very low temperatures outside or high temperatures mixed with high humidity.

Inlaturarea neajunsurilor se poate face doar prin interventia asupra acestor parametri.

Condensation occurs when the air inside is saturated vapor, the amount that can be absorbed by a volume of air is temperature dependent. “Indoor air kills” is the title of a book published in Sweden. There is evidence to support the dramatic title of the book, as explained, by the co-author professor Anders Svensson.

Condensation is a physical phenomenon that can not be avoided and the causes of condensation on the inner surface of the construction elements are explained as follows:

All residences have water vapors. Measurements have established the following amounts:

  • breathing: a daily 1-2 liters vapors;
  • daily preparation of food: 2 liters of daily vapor in a household of 4 people
  • existing steam generating sources: household activities, bathing, washing (drying / ironing) laundry, aquariums, pools, reheating food etc: up to 3 liters for a group of 4 people;
  • 1 sq/m plant releases about 2 liters in 24 hours;
  • vapor emissions from various sources (g/h):
Hot shower2000
Boiling pot of water900
Cooker400
An active person’s breathing400
Covered pot with boiling water350
Hot bath300
5 kg of laundry200
Stove flame on low100
A person’s breathing100
Plate of hot food60
A person’s breathing during sleep50

Other forms in which water acts on buildings: water as rain, snow, or other weather elements influence the closing systems of the building (roof, walls, windows and doors, balconies), water used in the initial construction (wet plaster, concrete pouring mounted ceramic tiles, relatively recent work – freshly built walls, plastered, painted, take a long enough period to dry completely), water derived from hygroscopic humidity inside and outside, depending on the physical structure of the material of construction; biological water (breathing, sweating), etc..

Other sources of increased humidity in rooms: rainwater pipes passing through the apartments, permanent water leaks (untested systems, leaky pipes, toilet tanks without coverage, etc..).

Lack of uniform heating in all rooms of the residence: in rooms that are less heated (eg. Bedrooms) condense can appear on a cold day and on windows with insulating glass. This is because the space is cool at night and by breathing the air becomes saturated with water vapor. Rooms found on the north side of the house, particularly during harsh winters.

Improper location of heating sources: the location of heating sources should remove all cold areas inside a room, they are usually mounted next to windows or on the north of the room. There should be a connection between the size of the window and radiator. Lack of ventilation in a room is also a problem. There is also a connection between windows and the ventilation in a room. Oddly enough, one of the exceptional qualities of the double glazed windows that ensure a 100% tightness can lead (in some cases) to some trouble. Natural ventilation is canceled in the rooms that use these windows. Before using the double glazed glass windows, apartments with old wooden windows had natural ventilation. Remember: clean air is vital. The role of a ventilation system is to remove dust and to replace saturated air with fresh air. Minimum living conditions for a human in a closed space is to have enough oxygen (O2) and where to dispose of carbon dioxide (CO2). Normally a person consumes 20-25 l / h O2, when performing medium effort.

Improper installation of exterior and interior window sills: installation of interior window sills over radiators and using drapes or curtains of a dense material (also available over heating points) obstructing heat release and effective flow of hot air and can contribute to the emergence and development of condensation.

Poor thermal-insulation: the chamber’s wall temperature plays a decisive role in the phenomenon of condensation. In this respect, it is sufficient that a surface temperature that comes in contact with air can be below the dew point. Today every house exterior is insulated polystyrene

The influence of inadequate sealing: we recommend a proper joinery system using aluminum profiles or in case of the PVC joinery use multi-glazing with low emissivity (Low-E).

Improper design of a blank window: a window mounted very low in an attic will reduce the hot air flow.

Incorrect installation of a window: it happens when the windows are not fitted properly, then condensation may occur.

Building thermal bridges: a thermal barrier can be defined as an average good conductor of heat, which makes continuity (connection) between a point outside of an enclosure and an interior point of it. Thermal bridges are a source of discomfort and loss of energy. To prevent them there are a variety of systems. From basement to roof, the house should be treated.

“Condensation may occur on the outer surface of the insulating glass when the glass surface is colder than the air in the enclosure (see auto glass behavior). Condensation on the glass surface located inside is due, especially, when ventilation is poor, due to disruption of normal flow of the air inside, caused by curtains, blinds, window boxes, etc…also as a poor location of the heating elements . An important factor for condensation on cold surfaces is saturated vapor and air in specific premises (bathrooms, kitchens, bedrooms). The solution is represented by ensuring a fair and repeated ventilation of the room.” (According to the VISUAL QUALITY ASSESSMENT OF GLASS in Chapter IV).

Tags: heat loss

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