Heat rejection - Revision history

103.108.248.21 at 01:28, 16 May 2022

2022-05-16T01:28:59Z

← Older revision		Revision as of 01:28, 16 May 2022
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	* Thermal storage for cooling.		* Thermal storage for cooling.

−	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Sustainability]] [[Category:Design]] [[Category:Products_/_components]]	+	[[Category:Articles_needing_more_work]] [[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Sustainability]] [[Category:Design]] [[Category:Products_/_components]]

Designing Buildings at 08:30, 12 October 2020

2020-10-12T08:30:04Z

← Older revision		Revision as of 08:30, 12 October 2020
Line 1:		Line 1:
−	~~To help develop this article, click 'Edit this article' above.~~
−
	= Introduction =		= Introduction =

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	Heat recovery is the process of collecting and re-using heat that would otherwise be lost. This can help reduce the energy consumption of the process or the heat can be used elsewhere, reducing running costs and carbon emissions. See Heat recovery for more information.		Heat recovery is the process of collecting and re-using heat that would otherwise be lost. This can help reduce the energy consumption of the process or the heat can be used elsewhere, reducing running costs and carbon emissions. See Heat recovery for more information.

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

	* Absorption refrigeration.		* Absorption refrigeration.
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	* Thermal storage for cooling.		* Thermal storage for cooling.

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

78.154.117.18 at 13:13, 17 July 2018

2018-07-17T13:13:12Z

← Older revision		Revision as of 13:13, 17 July 2018
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	= Introduction =		= Introduction =

−	Waste heat can be produced by any process that uses energy. In buildings, this might include::	+	Waste heat can be produced by any process that uses energy. In buildings, this might include:

	* Heating, ventilation and air-conditioning systems (HVAC).		* Heating, ventilation and air-conditioning systems (HVAC).
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	* Thermal storage for cooling.		* Thermal storage for cooling.

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

193.227.184.18 at 07:04, 4 July 2016

2016-07-04T07:04:34Z

← Older revision		Revision as of 07:04, 4 July 2016
Line 1:		Line 1:
−		+	To help develop this article, click 'Edit this article' above.
−	To help develop this article, click ~~‘Edit~~ this ~~article’~~ above.	+

	= Introduction =		= Introduction =

	Waste heat can be produced by any process that uses energy. In buildings, this might include::		Waste heat can be produced by any process that uses energy. In buildings, this might include::
−	*Heating, ventilation and air-conditioning systems (HVAC).	+
−	*Refrigeration.	+	* Heating, ventilation and air-conditioning systems (HVAC).
−	*Machinery, equipment and industrial processes.	+	* Refrigeration.
		+	* Machinery, equipment and industrial processes.

	Where this waste heat is at a low-temperature, it may have limited useful capacity for work and so it may be rejected to the environment. However, if it is suitable for use in another process, a portion of heat that would otherwise be wasted might be reused. This is known as heat recovery.		Where this waste heat is at a low-temperature, it may have limited useful capacity for work and so it may be rejected to the environment. However, if it is suitable for use in another process, a portion of heat that would otherwise be wasted might be reused. This is known as heat recovery.
Line 17:		Line 17:
	Air cooling can be as simple as using mechanical or natural ventilation to reject excess heat to the outside.		Air cooling can be as simple as using mechanical or natural ventilation to reject excess heat to the outside.

−	Typically in heating, ventilation and air-conditioning systems, air cooling rejects heat to the outside air by circulating 'outside' air over coils containing ~~‘hot’~~ fluid returning from the building. Heat is transferred from the coil to the air which is then rejected to the outside. See cooling for more information.	+	Typically in heating, ventilation and air-conditioning systems, air cooling rejects heat to the outside air by circulating 'outside' air over coils containing 'hot' fluid returning from the building. Heat is transferred from the coil to the air which is then rejected to the outside. See cooling for more information.

	= Evaporative cooling =		= Evaporative cooling =
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Absorption refrigeration.
−	*Air conditioning.
−	*Air handling unit.
−	*Chilled water.
−	*Chiller unit.
−	*Cooling tower.
−	*Cooling.
−	*Heat pump.
−	*Heating.
−	*Heat recovery.
−	*HVAC.
−	*Mechanical ventilation.
−	*Night-time purging.
−	*Passive ventilation.
−	*Refrigerants.
−	*Thermal labyrinth.
−	*Thermal storage for cooling.

−	[[Category:Sustainability]]	+	* Absorption refrigeration.
−	[[Category:Design]]	+	* Air conditioning.
−	[[Category:Products_/_components]]	+	* Air handling unit.
		+	* Chilled water.
		+	* Chiller unit.
		+	* Cooling tower.
		+	* Cooling.
		+	* Heat pump.
		+	* Heating.
		+	* Heat recovery.
		+	* HVAC.
		+	* Mechanical ventilation.
		+	* Night-time purging.
		+	* Passive ventilation.
		+	* Refrigerants.
		+	* Thermal labyrinth.
		+	* Thermal storage for cooling.
		+
		+	[[Category:Sustainability]] [[Category:Design]] [[Category:Products_/_components]]

Mustafa Pasha at 16:33, 24 February 2015

2015-02-24T16:33:55Z

← Older revision		Revision as of 16:33, 24 February 2015
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	= Introduction =		= Introduction =

−	Waste heat can be produced any process that uses energy. In buildings, this might include::	+	Waste heat can be produced by any process that uses energy. In buildings, this might include::
	*Heating, ventilation and air-conditioning systems (HVAC).		*Heating, ventilation and air-conditioning systems (HVAC).
	*Refrigeration.		*Refrigeration.
	*Machinery, equipment and industrial processes.		*Machinery, equipment and industrial processes.

−	Where this waste heat is at a low-temperature, it may have limited useful capacity for work and so it may be rejected to the environment. However, if it suitable for use in another process, a portion of heat that would otherwise be wasted might be reused. This is known as heat recovery.	+	Where this waste heat is at a low-temperature, it may have limited useful capacity for work and so it may be rejected to the environment. However, if it is suitable for use in another process, a portion of heat that would otherwise be wasted might be reused. This is known as heat recovery.

	Heat rejection methods include, air cooing, evaporative cooling, and ground coupling.		Heat rejection methods include, air cooing, evaporative cooling, and ground coupling.
Line 23:		Line 23:
	When water evaporates, it absorbs significant amounts of heat energy (latent heat), which produces a cooling effect in its surroundings.		When water evaporates, it absorbs significant amounts of heat energy (latent heat), which produces a cooling effect in its surroundings.

−	Direct evaporative coolers (sometimes referred to as sump coolers, swamp coolers, or desert coolers) draw hot, dry air through a continually dampened pad and supply cool, humid air.	+	Direct evaporative coolers (sometimes referred to as sump coolers, swamp coolers, or desert coolers) draw hot, dry air through a continually dampened pad and supply cool, humid air.

	Indirect evaporative cooling can be achieved by using a heat exchanger to cool supply air, by spraying water over the cooling coils of a conventional chiller or by cooling towers.		Indirect evaporative cooling can be achieved by using a heat exchanger to cool supply air, by spraying water over the cooling coils of a conventional chiller or by cooling towers.
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	= Ground coupling =		= Ground coupling =

−	Earth-to-air heat exchangers draw air through buried ducts or tubes (sometimes referred to as earth tubes). As the temperature of the ground below 3m is practically constant, it can be ~~use~~ to substantially reduce air temperatures. See Earth-to-air heat exchanger for more information.	+	Earth-to-air heat exchangers draw air through buried ducts or tubes (sometimes referred to as earth tubes). As the temperature of the ground below 3m is practically constant, it can be used to substantially reduce air temperatures. See Earth-to-air heat exchanger for more information.

	Open or closed loop water to air heat exchangers, similarly exploit the relatively stable temperature of the earth to provide cool water. See Ground energy options for more information.		Open or closed loop water to air heat exchangers, similarly exploit the relatively stable temperature of the earth to provide cool water. See Ground energy options for more information.

Designing Buildings at 10:44, 23 February 2015

2015-02-23T10:44:43Z

← Older revision		Revision as of 10:44, 23 February 2015
Line 4:		Line 4:
	= Introduction =		= Introduction =

−	Waste heat can be produced any process that uses energy, ~~such as~~:	+	Waste heat can be produced any process that uses energy. In buildings, this might include::
	*Heating, ventilation and air-conditioning systems (HVAC).		*Heating, ventilation and air-conditioning systems (HVAC).
	*Refrigeration.		*Refrigeration.
−	*Machinery, equipment, industrial processes.	+	*Machinery, equipment and industrial processes.

−	Where waste heat is at a low-temperature, it may have limited useful capacity for work ~~(exergy)~~ and so it may be rejected to the environment. However, if it suitable for use in another process, a portion of heat that would otherwise be wasted might be reused. This is known as heat recovery.	+	Where this waste heat is at a low-temperature, it may have limited useful capacity for work and so it may be rejected to the environment. However, if it suitable for use in another process, a portion of heat that would otherwise be wasted might be reused. This is known as heat recovery.

	Heat rejection methods include, air cooing, evaporative cooling, and ground coupling.		Heat rejection methods include, air cooing, evaporative cooling, and ground coupling.
Line 17:		Line 17:
	Air cooling can be as simple as using mechanical or natural ventilation to reject excess heat to the outside.		Air cooling can be as simple as using mechanical or natural ventilation to reject excess heat to the outside.

−	Typically in heating, ventilation and air-conditioning systems, air cooling, rejects heat to the outside air by circulating air over coils containing ‘hot’ fluid. Heat is transferred from the coil to the air which is rejected to the outside.	+	Typically in heating, ventilation and air-conditioning systems, air cooling rejects heat to the outside air by circulating 'outside' air over coils containing ‘hot’ fluid returning from the building. Heat is transferred from the coil to the air which is then rejected to the outside. See cooling for more information.

	= Evaporative cooling =		= Evaporative cooling =
Line 23:		Line 23:
	When water evaporates, it absorbs significant amounts of heat energy (latent heat), which produces a cooling effect in its surroundings.		When water evaporates, it absorbs significant amounts of heat energy (latent heat), which produces a cooling effect in its surroundings.

−	Direct evaporative coolers (sometimes referred to as sump coolers, swamp coolers, or desert coolers) draw hot, dry air through a continually dampened pad and supply cool, humid air~~. Indirect evaporative cooling can be achieved by using a heat exchanger to cool the supply air, by spraying water over the cooling coils of a conventional chiller or by cooling towers~~.	+	Direct evaporative coolers (sometimes referred to as sump coolers, swamp coolers, or desert coolers) draw hot, dry air through a continually dampened pad and supply cool, humid air.

−	Cooling towers reject heat through the evaporation of water in a moving air stream within the cooling tower. The temperature and humidity of the air stream increases through contact with the warm water, and this air is then discharged. The cooled water is collected at the bottom of the tower. This process can achieve lower temperatures than air-cooled heat rejection systems.	+	Indirect evaporative cooling can be achieved by using a heat exchanger to cool supply air, by spraying water over the cooling coils of a conventional chiller or by cooling towers.
		+
		+	Cooling towers reject heat through the evaporation of water in a moving air stream within the cooling tower. The temperature and humidity of the air stream increases through contact with the warm water, and this air is then discharged. The cooled water is collected at the bottom of the tower. This process can achieve lower temperatures than air-cooled heat rejection systems. See Cooling towers for more information.

	= Ground coupling =		= Ground coupling =

−	Earth-to-air heat exchangers ~~draws~~ air through buried ducts or tubes (sometimes referred to as earth tubes). As the temperature of the ground below 3m is practically constant, it can be use to substantially reduce air temperatures. See Earth-to-air heat exchanger for more information.	+	Earth-to-air heat exchangers draw air through buried ducts or tubes (sometimes referred to as earth tubes). As the temperature of the ground below 3m is practically constant, it can be use to substantially reduce air temperatures. See Earth-to-air heat exchanger for more information.

	Open or closed loop water to air heat exchangers, similarly exploit the relatively stable temperature of the earth to provide cool water. See Ground energy options for more information.		Open or closed loop water to air heat exchangers, similarly exploit the relatively stable temperature of the earth to provide cool water. See Ground energy options for more information.
Line 47:		Line 49:
	*Cooling tower.		*Cooling tower.
	*Cooling.		*Cooling.
		+	*Heat pump.
	*Heating.		*Heating.
		+	*Heat recovery.
	*HVAC.		*HVAC.
	*Mechanical ventilation.		*Mechanical ventilation.

Designing Buildings: Created page with " To help develop this article, click ‘Edit this article’ above. = Introduction = Waste heat can be produced any process that uses energy, such as: *Heating, ventilation and..."

2015-02-23T10:39:33Z

Created page with " To help develop this article, click ‘Edit this article’ above. = Introduction = Waste heat can be produced any process that uses energy, such as: *Heating, ventilation and..."

New page

To help develop this article, click ‘Edit this article’ above.

= Introduction =

Waste heat can be produced any process that uses energy, such as:
*Heating, ventilation and air-conditioning systems (HVAC).
*Refrigeration.
*Machinery, equipment, industrial processes.

Where waste heat is at a low-temperature, it may have limited useful capacity for work (exergy) and so it may be rejected to the environment. However, if it suitable for use in another process, a portion of heat that would otherwise be wasted might be reused. This is known as heat recovery.

Heat rejection methods include, air cooing, evaporative cooling, and ground coupling.

= Air cooling =

Air cooling can be as simple as using mechanical or natural ventilation to reject excess heat to the outside.

Typically in heating, ventilation and air-conditioning systems, air cooling, rejects heat to the outside air by circulating air over coils containing ‘hot’ fluid. Heat is transferred from the coil to the air which is rejected to the outside.

= Evaporative cooling =

When water evaporates, it absorbs significant amounts of heat energy (latent heat), which produces a cooling effect in its surroundings.

Direct evaporative coolers (sometimes referred to as sump coolers, swamp coolers, or desert coolers) draw hot, dry air through a continually dampened pad and supply cool, humid air. Indirect evaporative cooling can be achieved by using a heat exchanger to cool the supply air, by spraying water over the cooling coils of a conventional chiller or by cooling towers.

Cooling towers reject heat through the evaporation of water in a moving air stream within the cooling tower. The temperature and humidity of the air stream increases through contact with the warm water, and this air is then discharged. The cooled water is collected at the bottom of the tower. This process can achieve lower temperatures than air-cooled heat rejection systems.

= Ground coupling =

Earth-to-air heat exchangers draws air through buried ducts or tubes (sometimes referred to as earth tubes). As the temperature of the ground below 3m is practically constant, it can be use to substantially reduce air temperatures. See Earth-to-air heat exchanger for more information.

Open or closed loop water to air heat exchangers, similarly exploit the relatively stable temperature of the earth to provide cool water. See Ground energy options for more information.

= Heat recovery =

Heat recovery is the process of collecting and re-using heat that would otherwise be lost. This can help reduce the energy consumption of the process or the heat can be used elsewhere, reducing running costs and carbon emissions. See Heat recovery for more information.

= Find out more =

=== Related articles on Designing Buildings Wiki ===
*Absorption refrigeration.
*Air conditioning.
*Air handling unit.
*Chilled water.
*Chiller unit.
*Cooling tower.
*Cooling.
*Heating.
*HVAC.
*Mechanical ventilation.
*Night-time purging.
*Passive ventilation.
*Refrigerants.
*Thermal labyrinth.
*Thermal storage for cooling.

[[Category:Sustainability]]
[[Category:Design]]
[[Category:Products_/_components]]