Humidity - Revision history

Designing Buildings at 07:10, 5 August 2022

2022-08-05T07:10:50Z

← Older revision		Revision as of 07:10, 5 August 2022
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	Humidity and condensation in buildings is regulated by Approved Document C (Site preparation and resistance to contaminates and moisture) and Approved Document F (Ventilation) and further guidance is available in BS 5250 Code of practice for the control of condensation in buildings.		Humidity and condensation in buildings is regulated by Approved Document C (Site preparation and resistance to contaminates and moisture) and Approved Document F (Ventilation) and further guidance is available in BS 5250 Code of practice for the control of condensation in buildings.
		+
		+	NB [https://www.bsria.com/uk/product/4BR42n/illustrated_guide_to_mechanical_cooling_bg_12010_a15d25e1/ Illustrated Guide to Mechanical Cooling (BG 1/2010)], written by Kevin Pennycook and published by BSRIA in 2010, defines Relative humidity as: ‘A term often used to specify the internal design condition for humidity within a space. A ratio, usually expressed as a percentage, indicating the humidity of the air. Literally the actual vapour pressure of the air at a given dry bulb temperature divided by the saturation vapour pressure of the air at the same temperature.’

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =
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	* Air conditioning.		* Air conditioning.
	* Approved Document F.		* Approved Document F.
−	* Cold bridge.
	* Condensation.		* Condensation.
	* Damp proofing.		* Damp proofing.
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	* Dew point.		* Dew point.
	* Diagnosing the causes of dampness (GR 5 revised).		* Diagnosing the causes of dampness (GR 5 revised).
−	* Draught proofing.
	* Dry-bulb temperature.		* Dry-bulb temperature.
	* Humidification.		* Humidification.
	* Humidistat.		* Humidistat.
	* HVAC.		* HVAC.
−	* HVAC balancing.
	* Interstitial condensation.		* Interstitial condensation.
	* Methodology for moisture investigations in traditional buildings.		* Methodology for moisture investigations in traditional buildings.
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	* Moisture content.		* Moisture content.
	* Mould growth.		* Mould growth.
−	* Preventing overheating.
	* Psychometric chart.		* Psychometric chart.
	* Rising damp.		* Rising damp.
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	* Thermal comfort.		* Thermal comfort.
	* Thermal indices.		* Thermal indices.
−	* Temperature.
−	* U-value.
	* Water vapour.		* Water vapour.
	* Wet-bulb temperature.		* Wet-bulb temperature.

	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Standards_/_measurements]]		[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Standards_/_measurements]]

Editor at 17:58, 3 February 2022

2022-02-03T17:58:27Z

← Older revision		Revision as of 17:58, 3 February 2022
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	* Condensation.		* Condensation.
	* Damp proofing.		* Damp proofing.
		+	* Dehumidification.
	* Designing HVAC to resist harmful microorganisms.		* Designing HVAC to resist harmful microorganisms.
	* Dew point.		* Dew point.

Editor at 16:33, 2 February 2022

2022-02-02T16:33:09Z

← Older revision		Revision as of 16:33, 2 February 2022
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	Humidity and condensation in buildings is regulated by Approved Document C (Site preparation and resistance to contaminates and moisture) and Approved Document F (Ventilation) and further guidance is available in BS 5250 Code of practice for the control of condensation in buildings.		Humidity and condensation in buildings is regulated by Approved Document C (Site preparation and resistance to contaminates and moisture) and Approved Document F (Ventilation) and further guidance is available in BS 5250 Code of practice for the control of condensation in buildings.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Air conditioning.		* Air conditioning.
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	* Draught proofing.		* Draught proofing.
	* Dry-bulb temperature.		* Dry-bulb temperature.
		+	* Humidification.
	* Humidistat.		* Humidistat.
	* HVAC.		* HVAC.

Editor at 13:44, 2 February 2022

2022-02-02T13:44:37Z

← Older revision		Revision as of 13:44, 2 February 2022
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	When air cools, it is less able to “hold” moisture, that is, the saturation water vapour density falls, and so relative humidity rises. When the relative humidity reaches 100%, the air will be saturated. This is described as the dew point. If the air continues to cool, moisture will begin to condense.		When air cools, it is less able to “hold” moisture, that is, the saturation water vapour density falls, and so relative humidity rises. When the relative humidity reaches 100%, the air will be saturated. This is described as the dew point. If the air continues to cool, moisture will begin to condense.

−	Humidity influences thermal comfort. The higher the relative humidity, the less heat a person is able to lose ~~heat~~ through the evaporation of moisture on the skin, and so the hotter they will feel. Conversely, air that is too dry can cause problems such as dry eyes, nose, ears and throat. Typically, a relative humidity of 40 to 60% is appropriate in many buildings.	+	Humidity influences thermal comfort. The higher the relative humidity, the less heat a person is able to lose through the evaporation of moisture on the skin, and so the hotter they will feel. Conversely, air that is too dry can cause problems such as dry eyes, nose, ears and throat. Typically, a relative humidity of 40 to 60% is appropriate in many buildings.

	Humidity also affects the performance of buildings, causing condensation, mould growth, mildew, staining, slip hazards, damage to equipment and the corrosion and decay of the building fabric as well as poor performance of insulation. Condensation can occur on surfaces, or can be interstitial condensation, occurring between the layers of the building envelope, typically as a result of air diffusing from the warm interior of the building to the cool exterior and reaching its dew point within the building fabric.		Humidity also affects the performance of buildings, causing condensation, mould growth, mildew, staining, slip hazards, damage to equipment and the corrosion and decay of the building fabric as well as poor performance of insulation. Condensation can occur on surfaces, or can be interstitial condensation, occurring between the layers of the building envelope, typically as a result of air diffusing from the warm interior of the building to the cool exterior and reaching its dew point within the building fabric.

Editor at 15:04, 26 April 2021

2021-04-26T15:04:53Z

← Older revision		Revision as of 15:04, 26 April 2021
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	* Draught proofing.		* Draught proofing.
	* Dry-bulb temperature.		* Dry-bulb temperature.
		+	* Humidistat.
	* HVAC.		* HVAC.
	* HVAC balancing.		* HVAC balancing.

Editor at 16:47, 19 January 2021

2021-01-19T16:47:16Z

← Older revision		Revision as of 16:47, 19 January 2021
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	* Condensation.		* Condensation.
	* Damp proofing.		* Damp proofing.
		+	* Designing HVAC to resist harmful microorganisms.
	* Dew point.		* Dew point.
	* Diagnosing the causes of dampness (GR 5 revised).		* Diagnosing the causes of dampness (GR 5 revised).

Designing Buildings at 08:01, 17 September 2020

2020-09-17T08:01:06Z

← Older revision		Revision as of 08:01, 17 September 2020
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	* Wet-bulb temperature.		* Wet-bulb temperature.

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

Editor at 11:11, 15 April 2020

2020-04-15T11:11:11Z

← Older revision		Revision as of 11:11, 15 April 2020
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	* Dry-bulb temperature.		* Dry-bulb temperature.
	* HVAC.		* HVAC.
		+	* HVAC balancing.
	* Interstitial condensation.		* Interstitial condensation.
	* Methodology for moisture investigations in traditional buildings.		* Methodology for moisture investigations in traditional buildings.
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	* Wet-bulb temperature.		* Wet-bulb temperature.

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

Editor at 13:18, 13 December 2019

2019-12-13T13:18:36Z

← Older revision		Revision as of 13:18, 13 December 2019
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	* HVAC.		* HVAC.
	* Interstitial condensation.		* Interstitial condensation.
		+	* Methodology for moisture investigations in traditional buildings.
	* Moisture.		* Moisture.
	* Moisture content.		* Moisture content.

Editor at 16:03, 24 June 2019

2019-06-24T16:03:43Z

← Older revision		Revision as of 16:03, 24 June 2019
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	* Interstitial condensation.		* Interstitial condensation.
	* Moisture.		* Moisture.
		+	* Moisture content.
	* Mould growth.		* Mould growth.
	* Preventing overheating.		* Preventing overheating.