Passive water efficiency measures - Revision history

Designing Buildings at 08:10, 4 November 2020

2020-11-04T08:10:15Z

← Older revision		Revision as of 08:10, 4 November 2020
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		+	= Introduction =
		+
	Passive water efficiency measures are those which require no behaviour change by the user.		Passive water efficiency measures are those which require no behaviour change by the user.

−	=== Handbasins ===	+	= Handbasins =

	* Water Saving Taps (efficient versions are as low as 1.7 L/min) are often the same price as less efficient models.		* Water Saving Taps (efficient versions are as low as 1.7 L/min) are often the same price as less efficient models.
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	* Foam soap requires little water to remove, and generally means less soap and water are used providing further cost saving.		* Foam soap requires little water to remove, and generally means less soap and water are used providing further cost saving.

−	=== Low flow toilets ===	+	= Low flow toilets =

	* Toilets are typically the largest water user in non-residential developments, allowing significant savings to be made.		* Toilets are typically the largest water user in non-residential developments, allowing significant savings to be made.
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	* Vacuum. These use air rather than water to flush, and can be used where gravity drainage is problematic. Some designs combine an air and water flush.		* Vacuum. These use air rather than water to flush, and can be used where gravity drainage is problematic. Some designs combine an air and water flush.

−	=== Urinals ===	+	= Urinals =

	Urinals are often set to flush regardless of use, typically 3 times an hour. A number of devices can be used to control flush frequency:		Urinals are often set to flush regardless of use, typically 3 times an hour. A number of devices can be used to control flush frequency:
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	# Air-flush. Individual traps are replaced by a single trap at the drain end. A low wattage DC fan provides airflow down the bowl to prevent odour. There are no chemicals and they are easy to clean.		# Air-flush. Individual traps are replaced by a single trap at the drain end. A low wattage DC fan provides airflow down the bowl to prevent odour. There are no chemicals and they are easy to clean.

−	=== Water Efficient Appliances ===	+	= Water Efficient Appliances =

	Typical washing machines use >50 L/cycle, and dishwashers >15L/cycle. Efficient versions use much less (40L/cycle and 10L/cycle), and modern washing machines often have a 'half load' cycle or intelligent monitoring to only use as much water as needed.		Typical washing machines use >50 L/cycle, and dishwashers >15L/cycle. Efficient versions use much less (40L/cycle and 10L/cycle), and modern washing machines often have a 'half load' cycle or intelligent monitoring to only use as much water as needed.
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	NB Passive water efficiency measures may qualify for tax allowances under the ECA Water Scheme.		NB Passive water efficiency measures may qualify for tax allowances under the ECA Water Scheme.

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

	* Approved document G.		* Approved document G.
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	* Water engineering.		* Water engineering.

−	[[Category:~~Water~~]] [[Category:~~Sustainability~~]] [[Category:~~Construction_techniques~~]] [[Category:~~Products_/_components~~]] [[Category:~~DCN_Product_Knowledge~~]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Water]] [[Category:Sustainability]] [[Category:Construction_techniques]] [[Category:Products_/_components]]

Designing Buildings at 14:09, 29 March 2019

2019-03-29T14:09:55Z

← Older revision		Revision as of 14:09, 29 March 2019
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	* Water engineering.		* Water engineering.

−	[[Category:Sustainability]] [[Category:Construction_techniques]] [[Category:Products_/_components]]	+	[[Category:Water]] [[Category:Sustainability]] [[Category:Construction_techniques]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Designing Buildings at 07:04, 23 May 2018

2018-05-23T07:04:39Z

← Older revision		Revision as of 07:04, 23 May 2018
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	* Sustainable urban drainage systems.		* Sustainable urban drainage systems.
	* Sustainable water.		* Sustainable water.
		+	* The State of the Environment: Water Resources.
	* Types of water.		* Types of water.
	* Water consumption.		* Water consumption.

Editor at 10:09, 12 July 2016

2016-07-12T10:09:58Z

← Older revision		Revision as of 10:09, 12 July 2016
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	* Hydraulic valve. This can be fitted to the inlet pipework of the urinal system. When water is used elsewhere in the washroom, the pressure decreases temporarily, the valve opens, and allows a pre-set volume of water to pass into the cistern. When the cistern is full, an auto-siphon will discharge and flush the urinal.		* Hydraulic valve. This can be fitted to the inlet pipework of the urinal system. When water is used elsewhere in the washroom, the pressure decreases temporarily, the valve opens, and allows a pre-set volume of water to pass into the cistern. When the cistern is full, an auto-siphon will discharge and flush the urinal.
−	* Passive infrared (PIR) sensor. This can be installed in the washroom to detect use of the urinal system. The sensor controls a solenoid valve which allows a pre-set volume of water to pass into the cistern. When the cistern is full, an auto-siphon will discharge and flush the urinal. A PIR sensor can be battery operated. Out-of-hours it can be set to deliver a ~~‘hygiene flush’~~.	+	* Passive infrared (PIR) sensor. This can be installed in the washroom to detect use of the urinal system. The sensor controls a solenoid valve which allows a pre-set volume of water to pass into the cistern. When the cistern is full, an auto-siphon will discharge and flush the urinal. A PIR sensor can be battery operated. Out-of-hours it can be set to deliver a 'hygiene flush'.
	* Manual shut-off. If usage hours are predictable, a single valve can be installed in the pipework supplying the washroom. This can be closed manually each day.		* Manual shut-off. If usage hours are predictable, a single valve can be installed in the pipework supplying the washroom. This can be closed manually each day.
	* A timer can be installed so that the water supply is shut off during periods of non-use. This is a more flexible and reliable alternative to manual shut-off.		* A timer can be installed so that the water supply is shut off during periods of non-use. This is a more flexible and reliable alternative to manual shut-off.
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	=== Water Efficient Appliances ===		=== Water Efficient Appliances ===

−	Typical washing machines use >50 L/cycle, and dishwashers >15L/cycle. Efficient versions use much less (40L/cycle and 10L/cycle), and modern washing machines often have a ~~‘half load’~~ cycle or intelligent monitoring to only use as much water as needed.	+	Typical washing machines use >50 L/cycle, and dishwashers >15L/cycle. Efficient versions use much less (40L/cycle and 10L/cycle), and modern washing machines often have a 'half load' cycle or intelligent monitoring to only use as much water as needed.

	NB Passive water efficiency measures may qualify for tax allowances under the ECA Water Scheme.		NB Passive water efficiency measures may qualify for tax allowances under the ECA Water Scheme.
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	* Passive building design.		* Passive building design.
	* Passivhaus.		* Passivhaus.
		+	* Rain garden.
	* Rainwater harvesting.		* Rainwater harvesting.
	* Sanitary accommodation.		* Sanitary accommodation.

Editor at 08:32, 10 May 2016

2016-05-10T08:32:04Z

← Older revision		Revision as of 08:32, 10 May 2016
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	* Flood and water management act.		* Flood and water management act.
	* Greywater.		* Greywater.
		+	* Marine energy and hydropower.
	* Passive building design.		* Passive building design.
	* Passivhaus.		* Passivhaus.

Editor at 13:55, 27 April 2016

2016-04-27T13:55:14Z

← Older revision		Revision as of 13:55, 27 April 2016
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−
	Passive water efficiency measures are those which require no behaviour change by the user.		Passive water efficiency measures are those which require no behaviour change by the user.

	=== Handbasins ===		=== Handbasins ===
−	*Water Saving Taps (efficient versions are as low as 1.7 L/min) are often the same price as less efficient models.	+
−	*Appropriate sink sizing. If a sink does not need to be completely filled to use it, then a smaller sink could be specified.	+	* Water Saving Taps (efficient versions are as low as 1.7 L/min) are often the same price as less efficient models.
−	*Foam soap requires little water to remove, and generally means less soap and water are used providing further cost saving.	+	* Appropriate sink sizing. If a sink does not need to be completely filled to use it, then a smaller sink could be specified.
		+	* Foam soap requires little water to remove, and generally means less soap and water are used providing further cost saving.

	=== Low flow toilets ===		=== Low flow toilets ===
−	*Toilets are typically the largest water user in non-residential developments, allowing significant savings to be made.	+
−	*Modern standard cisterns have a volume of 6L. Efficient designs can bring the average flush volume down to 3L.	+	* Toilets are typically the largest water user in non-residential developments, allowing significant savings to be made.
−	*Siphon mechanism. Low flush (4.5L) versions are available, but they are slow to refill the cistern and are only available in single flush.	+	* Modern standard cisterns have a volume of 6L. Efficient designs can bring the average flush volume down to 3L.
−	*Drop valve mechanism. Allows quick cistern refill (good for high frequency use) but the valve will eventually leak, and it is not as robust as the siphon. It may also require maintenance to remove scale deposits.	+	* Siphon mechanism. Low flush (4.5L) versions are available, but they are slow to refill the cistern and are only available in single flush.
−	*Delayed action inlet valve. This prevents water flowing into the cistern before the flush is complete.	+	* Drop valve mechanism. Allows quick cistern refill (good for high frequency use) but the valve will eventually leak, and it is not as robust as the siphon. It may also require maintenance to remove scale deposits.
−	*Interruptible flush. The user stops the flush by releasing the lever when the pan is clear.	+	* Delayed action inlet valve. This prevents water flowing into the cistern before the flush is complete.
−	*Composting. A tank or chamber is installed below the toilet bowl to collect waste. Liquid waste can be collected separately, diluted and used as fertiliser for trees and flowers. The solid waste can be collected after 6months to a year and used as compost.	+	* Interruptible flush. The user stops the flush by releasing the lever when the pan is clear.
−	*Vacuum. These use air rather than water to flush, and can be used where gravity drainage is problematic. Some designs combine an air and water flush.	+	* Composting. A tank or chamber is installed below the toilet bowl to collect waste. Liquid waste can be collected separately, diluted and used as fertiliser for trees and flowers. The solid waste can be collected after 6months to a year and used as compost.
		+	* Vacuum. These use air rather than water to flush, and can be used where gravity drainage is problematic. Some designs combine an air and water flush.

	=== Urinals ===		=== Urinals ===

	Urinals are often set to flush regardless of use, typically 3 times an hour. A number of devices can be used to control flush frequency:		Urinals are often set to flush regardless of use, typically 3 times an hour. A number of devices can be used to control flush frequency:
−	*Hydraulic valve. This can be fitted to the inlet pipework of the urinal system. When water is used elsewhere in the washroom, the pressure decreases temporarily, the valve opens, and allows a pre-set volume of water to pass into the cistern. When the cistern is full, an auto-siphon will discharge and flush the urinal.	+
−	*Passive infrared (PIR) sensor. This can be installed in the washroom to detect use of the urinal system. The sensor controls a solenoid valve which allows a pre-set volume of water to pass into the cistern. When the cistern is full, an auto-siphon will discharge and flush the urinal. A PIR sensor can be battery operated. Out-of-hours it can be set to deliver a ‘hygiene flush’.	+	* Hydraulic valve. This can be fitted to the inlet pipework of the urinal system. When water is used elsewhere in the washroom, the pressure decreases temporarily, the valve opens, and allows a pre-set volume of water to pass into the cistern. When the cistern is full, an auto-siphon will discharge and flush the urinal.
−	*Manual shut-off. If usage hours are predictable, a single valve can be installed in the pipework supplying the washroom. This can be closed manually each day.	+	* Passive infrared (PIR) sensor. This can be installed in the washroom to detect use of the urinal system. The sensor controls a solenoid valve which allows a pre-set volume of water to pass into the cistern. When the cistern is full, an auto-siphon will discharge and flush the urinal. A PIR sensor can be battery operated. Out-of-hours it can be set to deliver a ‘hygiene flush’.
−	*A timer can be installed so that the water supply is shut off during periods of non-use. This is a more flexible and reliable alternative to manual shut-off.	+	* Manual shut-off. If usage hours are predictable, a single valve can be installed in the pipework supplying the washroom. This can be closed manually each day.
−	*Waterless urinals. Can work effectively with the correct maintenance regime. There are three main types:	+	* A timer can be installed so that the water supply is shut off during periods of non-use. This is a more flexible and reliable alternative to manual shut-off.
−	#Siphonic Trap. These contain a barrier fluid which the urine passes through.	+	* Waterless urinals. Can work effectively with the correct maintenance regime. There are three main types:
−	#Deodorising pad / biological cartridge are fitted to break down bio-film.	+
−	#Air-flush. Individual traps are replaced by a single trap at the drain end. A low wattage DC fan provides airflow down the bowl to prevent odour. There are no chemicals and they are easy to clean.	+	# Siphonic Trap. These contain a barrier fluid which the urine passes through.
		+	# Deodorising pad / biological cartridge are fitted to break down bio-film.
		+	# Air-flush. Individual traps are replaced by a single trap at the drain end. A low wattage DC fan provides airflow down the bowl to prevent odour. There are no chemicals and they are easy to clean.

	=== Water Efficient Appliances ===		=== Water Efficient Appliances ===

−	Typical washing machines use >50 L/cycle, and dishwashers >15L/cycle. Efficient versions use much less (40L/cycle and 10L/cycle), and modern washing machines often have a ‘half load’ cycle or intelligent monitoring to only use as much water as needed.	+	Typical washing machines use >50 L/cycle, and dishwashers >15L/cycle. Efficient versions use much less (40L/cycle and 10L/cycle), and modern washing machines often have a ‘half load’ cycle or intelligent monitoring to only use as much water as needed.

	NB Passive water efficiency measures may qualify for tax allowances under the ECA Water Scheme.		NB Passive water efficiency measures may qualify for tax allowances under the ECA Water Scheme.
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Approved document G.
−	*Blackwater.<br/>
−	*ECA Water Scheme.
−	*Flood and water management act.
−	*Greywater.<br/>
−	*Passive building design.
−	*Passivhaus.
−	*Rainwater harvesting.
−	*Sanitary accommodation.
−	*Sanitaryware.
−	*Sustainable urban drainage systems.
−	*Types of water.
−	*Water consumption.
−	*Water engineering.

−	[[Category:Sustainability]]	+	* Approved document G.
−	[[Category:Construction_techniques]]	+	* Blackwater.
−	[[Category:Products_/_components]]	+	* ECA Water Scheme.
		+	* Flood and water management act.
		+	* Greywater.
		+	* Passive building design.
		+	* Passivhaus.
		+	* Rainwater harvesting.
		+	* Sanitary accommodation.
		+	* Sanitaryware.
		+	* Sustainable urban drainage systems.
		+	* Sustainable water.
		+	* Types of water.
		+	* Water consumption.
		+	* Water engineering.
		+
		+	[[Category:Sustainability]] [[Category:Construction_techniques]] [[Category:Products_/_components]]

Designing Buildings at 13:07, 28 August 2015

2015-08-28T13:07:38Z

← Older revision		Revision as of 13:07, 28 August 2015
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
		+	*Approved document G.
	*Blackwater.<br/>		*Blackwater.<br/>
	*ECA Water Scheme.		*ECA Water Scheme.
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	*Passivhaus.		*Passivhaus.
	*Rainwater harvesting.		*Rainwater harvesting.
		+	*Sanitary accommodation.
		+	*Sanitaryware.
	*Sustainable urban drainage systems.		*Sustainable urban drainage systems.
	*Types of water.		*Types of water.

Designing Buildings at 07:06, 21 May 2015

2015-05-21T07:06:35Z

← Older revision		Revision as of 07:06, 21 May 2015
Line 46:		Line 46:
	*Rainwater harvesting.		*Rainwater harvesting.
	*Sustainable urban drainage systems.		*Sustainable urban drainage systems.
		+	*Types of water.
	*Water consumption.		*Water consumption.
	*Water engineering.		*Water engineering.

		+	[[Category:Sustainability]]
	[[Category:Construction_techniques]]		[[Category:Construction_techniques]]
	[[Category:Products_/_components]]		[[Category:Products_/_components]]
−	~~[[Category:Sustainability]]~~

Designing Buildings at 09:09, 18 June 2014

2014-06-18T09:09:54Z

← Older revision		Revision as of 09:09, 18 June 2014
Line 43:		Line 43:
	*Greywater.<br/>		*Greywater.<br/>
	*Passive building design.		*Passive building design.
		+	*Passivhaus.
	*Rainwater harvesting.		*Rainwater harvesting.
	*Sustainable urban drainage systems.		*Sustainable urban drainage systems.

Designing Buildings at 10:13, 10 June 2014

2014-06-10T10:13:55Z

← Older revision		Revision as of 10:13, 10 June 2014
Line 38:		Line 38:

	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
		+	*Blackwater.<br/>
	*ECA Water Scheme.		*ECA Water Scheme.
	*Flood and water management act.		*Flood and water management act.
		+	*Greywater.<br/>
	*Passive building design.		*Passive building design.
	*Rainwater harvesting.		*Rainwater harvesting.