Earth to air heat exchangers - Revision history

Designing Buildings at 06:19, 2 September 2021

2021-09-02T06:19:18Z

← Older revision		Revision as of 06:19, 2 September 2021
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	This article was created by --[[User:Buro_Happold\|Buro Happold]] 17 March 2013, based on a 2008 article in 'Patterns'.		This article was created by --[[User:Buro_Happold\|Buro Happold]] 17 March 2013, based on a 2008 article in 'Patterns'.

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

	* Coefficient of Performance CoP.		* Coefficient of Performance CoP.

Designing Buildings at 08:45, 22 September 2020

2020-09-22T08:45:06Z

← Older revision		Revision as of 08:45, 22 September 2020
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	* Thermal labyrinths.		* Thermal labyrinths.

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

Designing Buildings at 10:12, 18 August 2018

2018-08-18T10:12:49Z

← Older revision		Revision as of 10:12, 18 August 2018
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	= Size and output =		= Size and output =

−	The optimum pipe length is a function of pipe diameter and air velocity. Small pipe diameters of between 200 and 300mm are thermally more efficient. Pipes should be buried at a minimum~~<br />~~	+	The optimum pipe length is a function of pipe diameter and air velocity. Small pipe diameters of between 200 and 300mm are thermally more efficient. Pipes should be buried at a minimum
−	depth of 2m and separated by 1-2m to allow heat dissipation. The optimum air velocity is typically 2m/s.	+
		+	depth of 2m and separated by 1-2m to allow heat dissipation. The optimum air velocity is typically 2m/s.

	Under constant load, the cooling capacity of the ground may become exhausted and, therefore, generally it is not possible to meet high loads. With high loads, two separate duct systems could be considered – one for use in the morning and one for use in the afternoon.		Under constant load, the cooling capacity of the ground may become exhausted and, therefore, generally it is not possible to meet high loads. With high loads, two separate duct systems could be considered – one for use in the morning and one for use in the afternoon.
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	* Ground preconditioning of supply air.		* Ground preconditioning of supply air.
	* Ground source heat pumps.		* Ground source heat pumps.
		+	* Renewable energy sources: how they work and what they deliver: Part 3: Electrically driven heat pumps DG 532 3.
	* Thermal labyrinths.		* Thermal labyrinths.

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

Editor at 12:07, 16 September 2016

2016-09-16T12:07:03Z

← Older revision		Revision as of 12:07, 16 September 2016
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−
	= Introduction =		= Introduction =

	An earth-to-air heat exchanger draws ventilation supply air through buried ducts or tubes. As the temperature of the ground below 3m is practically constant, it substantially reduces ambient air temperature fluctuations. It therefore provides space conditioning throughout the year, with the incoming air being heated in the winter and cooled in the summer by means of earth coupling.		An earth-to-air heat exchanger draws ventilation supply air through buried ducts or tubes. As the temperature of the ground below 3m is practically constant, it substantially reduces ambient air temperature fluctuations. It therefore provides space conditioning throughout the year, with the incoming air being heated in the winter and cooled in the summer by means of earth coupling.

−	[[File:~~Earth tubes~~.jpg\|~~412x297px~~\|~~alt~~=~~Earth tubes~~.jpg]]	+	[[File:Earth_tubes.jpg\|387px\|link=File:Earth_tubes.jpg]]

	= System options =		= System options =
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	= Size and output =		= Size and output =

−	The optimum pipe length is a function of pipe diameter and air velocity. Small pipe diameters of between 200 and 300mm are thermally more efficient. Pipes should be buried at a minimum<br/>depth of 2m and separated by 1-2m to allow heat dissipation. The optimum air velocity is typically 2m/s.	+	The optimum pipe length is a function of pipe diameter and air velocity. Small pipe diameters of between 200 and 300mm are thermally more efficient. Pipes should be buried at a minimum<br />
		+	depth of 2m and separated by 1-2m to allow heat dissipation. The optimum air velocity is typically 2m/s.

	Under constant load, the cooling capacity of the ground may become exhausted and, therefore, generally it is not possible to meet high loads. With high loads, two separate duct systems could be considered – one for use in the morning and one for use in the afternoon.		Under constant load, the cooling capacity of the ground may become exhausted and, therefore, generally it is not possible to meet high loads. With high loads, two separate duct systems could be considered – one for use in the morning and one for use in the afternoon.
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	Earth-to-air heat exchangers can be used on new buildings or refurbishments to provide free cooling in the summer and pre-heating of air in the winter. They have high capital costs, but over the life of the system can yield substantial savings.		Earth-to-air heat exchangers can be used on new buildings or refurbishments to provide free cooling in the summer and pre-heating of air in the winter. They have high capital costs, but over the life of the system can yield substantial savings.

−	----	+	-----
−		+
	This article was created by --[[User:Buro_Happold\|Buro Happold]] 17 March 2013, based on a 2008 article in 'Patterns'.		This article was created by --[[User:Buro_Happold\|Buro Happold]] 17 March 2013, based on a 2008 article in 'Patterns'.

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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Dynamic thermal modelling of closed loop geothermal heat pump systems.
−	*Geothermal energy.
−	*Geothermal pile foundations.
−	*Ground energy options
−	*Ground preconditioning of supply air.
−	*Ground source heat pumps.
−	*Thermal labyrinths.

−	[[Category:~~Products_/_components~~]]	+	* Coefficient of Performance CoP.
−	[[Category:~~Sustainability~~]]	+	* Dynamic thermal modelling of closed loop geothermal heat pump systems.
		+	* Geothermal energy.
		+	* Geothermal pile foundations.
		+	* Ground energy options
		+	* Ground preconditioning of supply air.
		+	* Ground source heat pumps.
		+	* Thermal labyrinths.
		+
		+	[[Category:Sustainability]] [[Category:Products_/_components]]

Designing Buildings at 06:57, 27 May 2014

2014-05-27T06:57:49Z

← Older revision		Revision as of 06:57, 27 May 2014
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	----		----

−	This article was created by [[User~~%3ABuro%20Happold~~\|Buro Happold]] 17 March 2013, based on a 2008 article in 'Patterns'.	+	This article was created by --[[User:Buro_Happold\|Buro Happold]] 17 March 2013, based on a 2008 article in 'Patterns'.

	= Find out more =		= Find out more =

Designing Buildings at 06:54, 22 June 2013

2013-06-22T06:54:24Z

← Older revision		Revision as of 06:54, 22 June 2013
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	= Introduction =		= Introduction =

−	An earth-to-air heat exchanger ~~(ETAHE)~~ draws ventilation supply air through buried ducts or tubes. As the temperature of the ground below 3m is practically constant, it substantially reduces ambient air temperature fluctuations. It therefore provides space conditioning throughout the year, with the incoming air being heated in the winter and cooled in the summer by means of earth coupling.	+	An earth-to-air heat exchanger draws ventilation supply air through buried ducts or tubes. As the temperature of the ground below 3m is practically constant, it substantially reduces ambient air temperature fluctuations. It therefore provides space conditioning throughout the year, with the incoming air being heated in the winter and cooled in the summer by means of earth coupling.

	[[File:Earth tubes.jpg\|412x297px\|alt=Earth tubes.jpg]]		[[File:Earth tubes.jpg\|412x297px\|alt=Earth tubes.jpg]]
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	Systems can be driven by natural stack ventilation, but usually require mechanical ventilation. In some cases air is circulated via air handling units, allowing filtering and supplementary heating/cooling. A simple controller can be used to monitor inlet and outlet temperatures, as well as indoor air temperatures. Ground coupling ducts or tubes can be of plastic, concrete or clay – the material choice is of little consequence thermally due to the high thermal resistance of the ground.		Systems can be driven by natural stack ventilation, but usually require mechanical ventilation. In some cases air is circulated via air handling units, allowing filtering and supplementary heating/cooling. A simple controller can be used to monitor inlet and outlet temperatures, as well as indoor air temperatures. Ground coupling ducts or tubes can be of plastic, concrete or clay – the material choice is of little consequence thermally due to the high thermal resistance of the ground.

−	~~ETAHE~~ are suited to mechanically ventilated buildings with a moderate cooling demand, located in climates with a large temperature differential between summer and winter, and between day and night. Location of the ducts in sand or gravel below the water level, where there is moving ground water, gives the best performance, however, the presence of ground water involves extensive sealing precautions.	+	Earth-to-air heat exchangers are suited to mechanically ventilated buildings with a moderate cooling demand, located in climates with a large temperature differential between summer and winter, and between day and night. Location of the ducts in sand or gravel below the water level, where there is moving ground water, gives the best performance, however, the presence of ground water involves extensive sealing precautions.

	= Size and output =		= Size and output =
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	= Summary =		= Summary =

−	~~ETAHEs~~ can be used on new buildings or refurbishments to provide free cooling in the summer and pre-heating of air in the winter. They have high capital costs, but over the life of the system can yield substantial savings.	+	Earth-to-air heat exchangers can be used on new buildings or refurbishments to provide free cooling in the summer and pre-heating of air in the winter. They have high capital costs, but over the life of the system can yield substantial savings.

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Designing Buildings: moved Earth to air heat echangers to Earth to air heat exchangers: typo

2013-03-18T08:07:17Z

moved Earth to air heat echangers to Earth to air heat exchangers: typo

← Older revision

Revision as of 08:07, 18 March 2013

Designing Buildings at 10:21, 17 March 2013

2013-03-17T10:21:35Z

← Older revision		Revision as of 10:21, 17 March 2013
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	----		----

−	This article was ~~create~~ by [[User~~:Buro_Happold~~\|Buro Happold]] 17 March 2013 based on a 2008 article in 'Patterns'.	+	This article was created by [[User%3ABuro%20Happold\|Buro Happold]] 17 March 2013, based on a 2008 article in 'Patterns'.

	= Find out more =		= Find out more =

Designing Buildings at 10:21, 17 March 2013

2013-03-17T10:21:03Z

← Older revision		Revision as of 10:21, 17 March 2013
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	ETAHEs can be used on new buildings or refurbishments to provide free cooling in the summer and pre-heating of air in the winter. They have high capital costs, but over the life of the system can yield substantial savings.		ETAHEs can be used on new buildings or refurbishments to provide free cooling in the summer and pre-heating of air in the winter. They have high capital costs, but over the life of the system can yield substantial savings.
		+
		+	----
		+
		+	This article was create by [[User:Buro_Happold\|Buro Happold]] 17 March 2013 based on a 2008 article in 'Patterns'.

	= Find out more =		= Find out more =

Designing Buildings at 07:52, 16 March 2013

2013-03-16T07:52:43Z

← Older revision		Revision as of 07:52, 16 March 2013
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
		+	*Dynamic thermal modelling of closed loop geothermal heat pump systems.
	*Geothermal energy.		*Geothermal energy.
	*Geothermal pile foundations.		*Geothermal pile foundations.