Hygrothermal - Revision history

Designing Buildings at 09:15, 25 November 2020

2020-11-25T09:15:06Z

← Older revision		Revision as of 09:15, 25 November 2020
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	Physical testing may also be used to test the performance of materials or assemblies under a range of hygrothermal conditions.		Physical testing may also be used to test the performance of materials or assemblies under a range of hygrothermal conditions.
		+
		+	NB [https://historicengland.org.uk/images-books/publications/eehb-how-to-improve-energy-efficiency/ Energy Efficiency and Historic Buildings, How to Improve Energy Efficiency], Published by Historic England in 2018, defines hygrothermal behaviour as: ‘…the movement of heat and moisture through buildings. Permeable materials tend to be hygroscopic because of the reduction in vapour pressure in the pores that occurs as a result of condensation, capillarity and salt action.’

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =

Designing Buildings at 07:44, 10 November 2020

2020-11-10T07:44:00Z

← Older revision		Revision as of 07:44, 10 November 2020
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	* Water vapour.		* Water vapour.

−	[[Category:~~Standards_/_measurements~~]] [[Category:~~DCN_Standard~~]] [[Category:Design]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Standards_/_measurements]] [[Category:Design]]

Editor at 15:51, 20 September 2018

2018-09-20T15:51:07Z

← Older revision		Revision as of 15:51, 20 September 2018
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	Physical testing may also be used to test the performance of materials or assemblies under a range of hygrothermal conditions.		Physical testing may also be used to test the performance of materials or assemblies under a range of hygrothermal conditions.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* A Practical Guide to Building Thermal Modelling.		* A Practical Guide to Building Thermal Modelling.
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	* Ventilation.		* Ventilation.
	* Wall insulation and moisture risk.		* Wall insulation and moisture risk.
		+	* Water vapour.

−	[[Category:Standards_/_measurements]] [[Category:Design]]	+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]] [[Category:Design]]

Designing Buildings at 14:11, 27 September 2017

2017-09-27T14:11:00Z

← Older revision		Revision as of 14:11, 27 September 2017
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	Repeated wetting, drying, freezing and thawing of the fabric of a building can cause problems such as damp, condensation, mould growth and loss of thermal performance, and may even result in premature failure.		Repeated wetting, drying, freezing and thawing of the fabric of a building can cause problems such as damp, condensation, mould growth and loss of thermal performance, and may even result in premature failure.

−	Computer-based hygrothermal modelling simulates ~~and~~ the movement of heat and moisture, generating information relating to temperature, water content and relative humidity within multi-layer building elements.	+	Computer-based hygrothermal modelling simulates the movement of heat and moisture, generating information relating to temperature, water content and relative humidity within multi-layer building elements.

−	Buildings can be affected by water through a number of mechanisms:	+	Buildings can be affected by water through a number of mechanisms, including:

	* Water leaks.		* Water leaks.
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	* Evaporation.		* Evaporation.

−	By simulating the performance of building assemblies, the risks of problems associated with these mechanisms can be evaluated and minimised. ~~Understanding~~ risks such as condensation, moisture entrapment, fungal growth, material degradation, and so on, the correct balance between heat and moisture can be achieved.	+	By simulating the performance of building assemblies, the risks of problems associated with these mechanisms can be evaluated and minimised. By understanding risks such as condensation, moisture entrapment, fungal growth, material degradation, and so on, the correct balance between heat and moisture can be achieved.

	Physical testing may also be used to test the performance of materials or assemblies under a range of hygrothermal conditions.		Physical testing may also be used to test the performance of materials or assemblies under a range of hygrothermal conditions.

Designing Buildings at 14:09, 27 September 2017

2017-09-27T14:09:33Z

← Older revision		Revision as of 14:09, 27 September 2017
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−	The term 'hygrothermal' refers to the movement of heat and moisture through buildings. Computer-based hygrothermal modelling simulates and the movement of heat and moisture, generating information relating to temperature, water content and relative humidity within multi-layer building elements.	+	The term 'hygrothermal' refers to the movement of heat and moisture through buildings.
		+
		+	Repeated wetting, drying, freezing and thawing of the fabric of a building can cause problems such as damp, condensation, mould growth and loss of thermal performance, and may even result in premature failure.
		+
		+	Computer-based hygrothermal modelling simulates and the movement of heat and moisture, generating information relating to temperature, water content and relative humidity within multi-layer building elements.

	Buildings can be affected by water through a number of mechanisms:		Buildings can be affected by water through a number of mechanisms:
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	By simulating the performance of building assemblies, the risks of problems associated with these mechanisms can be evaluated and minimised. Understanding risks such as condensation, moisture entrapment, fungal growth, material degradation, and so on, the correct balance between heat and moisture can be achieved.		By simulating the performance of building assemblies, the risks of problems associated with these mechanisms can be evaluated and minimised. Understanding risks such as condensation, moisture entrapment, fungal growth, material degradation, and so on, the correct balance between heat and moisture can be achieved.
		+
		+	Physical testing may also be used to test the performance of materials or assemblies under a range of hygrothermal conditions.

	= Find out more =		= Find out more =

Designing Buildings at 14:05, 27 September 2017

2017-09-27T14:05:07Z

← Older revision		Revision as of 14:05, 27 September 2017
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===

		+	* A Practical Guide to Building Thermal Modelling.
		+	* CFD.
	* Cold bridge.		* Cold bridge.
		+	* Computational fluid dynamics in building design: An introduction FB 69.
	* Condensation.		* Condensation.
		+	* Convection.
		+	* Conventions for calculating linear thermal transmittance and temperature factors.
	* Damp in buildings.		* Damp in buildings.
−	* ~~Retrofitting traditional buildings~~.	+	* Dynamic thermal modelling of closed loop geothermal heat pump systems.
−	* Thermal ~~optical properties~~.	+	* Heat transfer.
		+	* The thermal behaviour of spaces enclosed by fabric membranes (Thesis).
		+	* Thermal behaviour of architectural fabric structures.
	* Thermography for traditional buildings.		* Thermography for traditional buildings.
	* Understanding dampness.		* Understanding dampness.
		+	* U-values.
	* Ventilation.		* Ventilation.
	* Wall insulation and moisture risk.		* Wall insulation and moisture risk.

	[[Category:Standards_/_measurements]] [[Category:Design]]		[[Category:Standards_/_measurements]] [[Category:Design]]

Designing Buildings at 14:02, 27 September 2017

2017-09-27T14:02:53Z

← Older revision		Revision as of 14:02, 27 September 2017
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	* Air infiltration and condensation through the building fabric.		* Air infiltration and condensation through the building fabric.
	* Vapour diffusion.		* Vapour diffusion.
−
	* Drainage.		* Drainage.
	* Ventilation.		* Ventilation.

Designing Buildings at 14:02, 27 September 2017

2017-09-27T14:02:18Z

← Older revision		Revision as of 14:02, 27 September 2017
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−	~~Water is one~~ of the ~~leading causes~~ of ~~degradation in the built environment~~, ~~both in liquid form (i.e. rain)~~, and ~~vapour form (i.e. from the soil)~~.	+	The term 'hygrothermal' refers to the movement of heat and moisture through buildings. Computer-based hygrothermal modelling simulates and the movement of heat and moisture, generating information relating to temperature, water content and relative humidity within multi-layer building elements.

−	Hygrothermal is a term used to refer to heat and moisture moving through buildings. Computer-based hygrothermal modeling simulates and predicts the movement of heat and moisture, enabling the prevention of early degradation and reduced service life. It does this by providing information relating to temperature, water content and relative humidity within multi-layer building elements.	+	Buildings can be affected by water through a number of mechanisms:
−		+
−	Buildings can be affected by water ~~in the following ways~~:	+

	* Water leaks.		* Water leaks.
−	* Wicking (groundwater ~~being drawn up through a concrete foundation)~~.	+	* Wicking of groundwater.
−	* Air ~~leaks~~ and condensation ~~inside a wall assembly~~.	+	* Penetrating and rising damp.
		+	* Air infiltration and condensation through the building fabric.
	* Vapour diffusion.		* Vapour diffusion.
−
−	~~The ways in which this water can dry out include:~~

	* Drainage.		* Drainage.
−	* ~~Air flow~~.	+	* Ventilation.
	* Evaporation.		* Evaporation.

−	By simulating the performance of assemblies ~~(i.e. walls, floors, floors, below-grade)~~, the risks associated with ~~their design, the specified materials and the likely climate conditions~~ can be evaluated and ~~assessed~~.	+	By simulating the performance of building assemblies, the risks of problems associated with these mechanisms can be evaluated and minimised. Understanding risks such as condensation, moisture entrapment, fungal growth, material degradation, and so on, the correct balance between heat and moisture can be achieved.
−		+
−	An example of a simulation that may be trialed is a particular type of insulation and the effects this has on the risk of condensation within the assembly; or the rate of cladding degradation under periods of heavy rain.	+
−		+
−	~~By tracking~~ such ~~risks~~ as condensation, moisture entrapment, fungal growth, material degradation, and so on, the correct balance between heat and moisture ~~in a building~~ can be achieved~~. The results of assessments can provide important data for the following:~~	+
−		+
−	* Surface condensation risk assessment (e.g. interior finishes damage, surface mould growth, and so on).	+
−	* Interstitial condensation risk assessment (e.g. exterior finishes damage, interstitial mould growth, structural damage, and so on).	+
−	* Energy impacts (e.g. moisture dependent thermal conductivity/U-value).	+

	= Find out more =		= Find out more =

Editor at 11:06, 26 September 2017

2017-09-26T11:06:00Z

← Older revision		Revision as of 11:06, 26 September 2017
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−	~~One~~ of the ~~factors that contribute most directly to the degradation~~ of the built environment ~~is the water from rain or soil~~ in ~~its~~ liquid or vapour form.	+	Water is one of the leading causes of degradation in the built environment, both in liquid form (i.e. rain), and vapour form (i.e. from the soil).

−	Hygrothermal ~~pertains~~ to ~~the movement of~~ heat and moisture through buildings. Computer-based modeling ~~offers highly accurate predictions~~ of ~~hygrothermal performance for preventing~~ early degradation and reduced service life.	+	Hygrothermal is a term used to refer to heat and moisture moving through buildings. Computer-based hygrothermal modeling simulates and predicts the movement of heat and moisture, enabling the prevention of early degradation and reduced service life. It does this by providing information relating to temperature, water content and relative humidity within multi-layer building elements.

−	~~It provides valuable information relating to temperature, relative humidity,~~ water ~~content within multi-layer building elements over time. Results of hygrothermal assessments provide important information for~~:	+	Buildings can be affected by water in the following ways:

−	* ~~Surface condensation risk assessment~~ (~~damage to interior finishes, surface mould growth~~)	+	* Water leaks.
−	* ~~Interstitial~~ condensation ~~risk assessment (damage to exterior finishes, interstitial mould growth, structural damage)~~	+	* Wicking (groundwater being drawn up through a concrete foundation).
−	* ~~Energy impacts (moisture dependent thermal conductivity/U-value)~~	+	* Air leaks and condensation inside a wall assembly.
		+	* Vapour diffusion.

−	Accommodate virtually any assembly type, including walls, roofs, floors, and even below-grade foundations. Determine moisture content, relative humidity, dew point and temperature at chosen surfaces and depths for each assembly component.	+	The ways in which this water can dry out include:

−	~~In buildings, you really can’t manage heat without also managing moisture~~. ~~For example, if you increase how much insulation is in a wall, you may also be increasing the risk of moisture and mold problems~~.	+	* Drainage.
		+	* Air flow.
		+	* Evaporation.

−	~~There are four ways that buildings~~ can ~~get wet:~~	+	By simulating the performance of assemblies (i.e. walls, floors, floors, below-grade), the risks associated with their design, the specified materials and the likely climate conditions can be evaluated and assessed.

−	* bulk water leaks (rain dripping through a ~~hole in your roof)~~	+	An example of a simulation that may be trialed is a particular type of insulation and the effects this has on the risk of condensation within the assembly; or the rate of cladding degradation under periods of heavy rain.
−	* wicking (groundwater being pulled up through a ~~concrete foundation)~~	+
−	* air leaks (condensation ~~inside a wall assembly)~~	+
−	* vapor diffusion (high interior relative humidity in the ~~winter~~; ~~high exterior relative humidity in~~ the ~~summer)~~	+

−	~~And there are just three ways they~~ can ~~dry when they get wet~~:	+	By tracking such risks as condensation, moisture entrapment, fungal growth, material degradation, and so on, the correct balance between heat and moisture in a building can be achieved. The results of assessments can provide important data for the following:

−	* ~~drainage~~ (~~intentional spaces between building components~~)	+	* Surface condensation risk assessment (e.g. interior finishes damage, surface mould growth, and so on).
−	* ~~air flow~~ (~~convective drying~~, ~~like your hair dryer~~)	+	* Interstitial condensation risk assessment (e.g. exterior finishes damage, interstitial mould growth, structural damage, and so on).
−	* ~~evaporation~~ (~~low relative humidity and adding the sun for drying~~)	+	* Energy impacts (e.g. moisture dependent thermal conductivity/U-value).

−	When a building is examined from a hygrothermal perspective, both moisture and heat flows on, off, and through your building are systematically tracked and evaluated. We learn the balance between wetting and drying in your building: to correct the balance if you have a moisture problem or to keep the balance if you are doing a renovation or retrofit.	+	= Find out more =

−	Hygrothermal modeling is the computer-assisted simulation of heat, air, and moisture flow through building enclosure assemblies (walls, roofs, floors, below-grade). It is the process of simulating the performance of assemblies so that the future durability and risk associated with different assembly designs, materials, and climate or exposure can be evaluated and assessed. For example, the risk for condensation within an assembly can be analyzed with different insulation or vapor retarder properties, or the influence of driving rain on cladding degradation can be predicted. The hygrothermal model results include temperature, humidity, and moisture content data at materials and at interfaces throughout the assembly. With this data, the user can assess the risk of condensation, moisture entrapment, fungal growth, and even material degradation.	+	=== Related articles on Designing Buildings Wiki ===

−	[[Category:~~Articles_needing_more_work~~]]	+	* Cold bridge.
		+	* Condensation.
		+	* Damp in buildings.
		+	* Retrofitting traditional buildings.
		+	* Thermal optical properties.
		+	* Thermography for traditional buildings.
		+	* Understanding dampness.
		+	* Ventilation.
		+	* Wall insulation and moisture risk.
		+
		+	[[Category:Standards_/_measurements]] [[Category:Design]]

Editor: Created page with "One of the factors that contribute most directly to the degradation of the built environment is the water from rain or soil in its liquid or vapour form. Hygrothermal pertains t..."

2017-09-25T15:41:31Z

Created page with "One of the factors that contribute most directly to the degradation of the built environment is the water from rain or soil in its liquid or vapour form. Hygrothermal pertains t..."

New page

One of the factors that contribute most directly to the degradation of the built environment is the water from rain or soil in its liquid or vapour form.

Hygrothermal pertains to the movement of heat and moisture through buildings. Computer-based modeling offers highly accurate predictions of hygrothermal performance for preventing early degradation and reduced service life.

It provides valuable information relating to temperature, relative humidity, water content within multi-layer building elements over time. Results of hygrothermal assessments provide important information for:

* Surface condensation risk assessment (damage to interior finishes, surface mould growth)
* Interstitial condensation risk assessment (damage to exterior finishes, interstitial mould growth, structural damage)
* Energy impacts (moisture dependent thermal conductivity/U-value)

Accommodate virtually any assembly type, including walls, roofs, floors, and even below-grade foundations. Determine moisture content, relative humidity, dew point and temperature at chosen surfaces and depths for each assembly component.

In buildings, you really can’t manage heat without also managing moisture. For example, if you increase how much insulation is in a wall, you may also be increasing the risk of moisture and mold problems.

There are four ways that buildings can get wet:

* bulk water leaks (rain dripping through a hole in your roof)
* wicking (groundwater being pulled up through a concrete foundation)
* air leaks (condensation inside a wall assembly)
* vapor diffusion (high interior relative humidity in the winter; high exterior relative humidity in the summer)

And there are just three ways they can dry when they get wet:

* drainage (intentional spaces between building components)
* air flow (convective drying, like your hair dryer)
* evaporation (low relative humidity and adding the sun for drying)

When a building is examined from a hygrothermal perspective, both moisture and heat flows on, off, and through your building are systematically tracked and evaluated. We learn the balance between wetting and drying in your building: to correct the balance if you have a moisture problem or to keep the balance if you are doing a renovation or retrofit.

Hygrothermal modeling is the computer-assisted simulation of heat, air, and moisture flow through building enclosure assemblies (walls, roofs, floors, below-grade). It is the process of simulating the performance of assemblies so that the future durability and risk associated with different assembly designs, materials, and climate or exposure can be evaluated and assessed. For example, the risk for condensation within an assembly can be analyzed with different insulation or vapor retarder properties, or the influence of driving rain on cladding degradation can be predicted. The hygrothermal model results include temperature, humidity, and moisture content data at materials and at interfaces throughout the assembly. With this data, the user can assess the risk of condensation, moisture entrapment, fungal growth, and even material degradation.

[[Category:Articles_needing_more_work]]