Chilled water - Revision history

Editor at 17:54, 3 February 2022

2022-02-03T17:54:39Z

← Older revision		Revision as of 17:54, 3 February 2022
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	* Cooling.		* Cooling.
	* Condensation.		* Condensation.
		+	* Dehumidification.
	* Fan coils.		* Fan coils.
	* Gasket.		* Gasket.

Editor at 16:54, 30 December 2021

2021-12-30T16:54:07Z

← Older revision		Revision as of 16:54, 30 December 2021
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	* Heating ventilation and air conditioning.		* Heating ventilation and air conditioning.
	* Heat pump.		* Heat pump.
		+	* How does a chilled water fan coil unit work?
	* Integrated service module.		* Integrated service module.
	* Refrigerant selection.		* Refrigerant selection.

Editor at 11:57, 16 November 2021

2021-11-16T11:57:07Z

← Older revision		Revision as of 11:57, 16 November 2021
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	NB: Refrigerants (rather than chilled water) can be used to provide cooling directly to spaces in variable refrigerant flow (VRF) systems. This is based on the flow of refrigerant between an external condensing unit and multiple internal evaporators (typically, fan coil units). See Variable refrigerant flow for more information.		NB: Refrigerants (rather than chilled water) can be used to provide cooling directly to spaces in variable refrigerant flow (VRF) systems. This is based on the flow of refrigerant between an external condensing unit and multiple internal evaporators (typically, fan coil units). See Variable refrigerant flow for more information.

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

	* Air conditioning.		* Air conditioning.
	* Air handling unit.		* Air handling unit.
	* BSRIA publishes new edition of BG29.		* BSRIA publishes new edition of BG29.
		+	* BSRIA Water Treatment for Closed Heating and Cooling Systems BG 50/2021.
	* Chilled beam.		* Chilled beam.
	* Chiller unit.		* Chiller unit.

Editor at 20:05, 16 March 2021

2021-03-16T20:05:57Z

← Older revision		Revision as of 20:05, 16 March 2021
Line 38:		Line 38:
	* Cooling.		* Cooling.
	* Condensation.		* Condensation.
		+	* Fan coils.
	* Gasket.		* Gasket.
	* Heating ventilation and air conditioning.		* Heating ventilation and air conditioning.

Designing Buildings at 06:54, 12 October 2020

2020-10-12T06:54:53Z

← Older revision		Revision as of 06:54, 12 October 2020
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	* Water vapour.		* Water vapour.

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

Editor at 10:59, 12 May 2020

2020-05-12T10:59:27Z

← Older revision		Revision as of 10:59, 12 May 2020
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	* Chilled beam.		* Chilled beam.
	* Chiller unit.		* Chiller unit.
		+	* Closed Systems Control Association.
	* Cooling.		* Cooling.
	* Condensation.		* Condensation.
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	* Water vapour.		* Water vapour.

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

Editor at 15:25, 4 May 2020

2020-05-04T15:25:49Z

← Older revision		Revision as of 15:25, 4 May 2020
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	* Air conditioning.		* Air conditioning.
	* Air handling unit.		* Air handling unit.
		+	* BSRIA publishes new edition of BG29.
	* Chilled beam.		* Chilled beam.
	* Chiller unit.		* Chiller unit.

Designing Buildings at 14:01, 29 March 2019

2019-03-29T14:01:27Z

← Older revision		Revision as of 14:01, 29 March 2019
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−	~~To help develop this article, click ‘Edit this article’ above.~~
−
−	~~-----~~
	Chilled water is commonly used in buildings to provide cooling.		Chilled water is commonly used in buildings to provide cooling.

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	* Water vapour.		* Water vapour.

−	[[Category:Products_/_components]]	+	[[Category:Water]] [[Category:Products_/_components]]

Editor at 15:49, 20 September 2018

2018-09-20T15:49:51Z

← Older revision		Revision as of 15:49, 20 September 2018
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	Chilled water is commonly used in buildings to provide cooling.		Chilled water is commonly used in buildings to provide cooling.

−	Typically, water is cooled in chiller units, and is then distributed by pipework to air handling units where it is used to cool air that is ducted through the building for ventilation. It can also be used for the dehumidification of ventilation air. As the temperature of air falls, it is less able to 'hold' moisture, that is, its saturation water vapour density falls, and moisture will begin to condense, dehumidifying the air. See ~~air~~ conditioning for more information.	+	Typically, water is cooled in chiller units, and is then distributed by pipework to air handling units where it is used to cool air that is ducted through the building for ventilation. It can also be used for the dehumidification of ventilation air. As the temperature of air falls, it is less able to 'hold' moisture, that is, its saturation water vapour density falls, and moisture will begin to condense, dehumidifying the air. See Air conditioning for more information.

	Chilled water may also be used to provide cooling to integrated service modules, chilled beams, chilled ceilings, underfloor cooling, for industrial processes and so on. The use of chilled water to cool the building fabric (rather than ventilation air) is sometimes described as 'active thermal mass'.		Chilled water may also be used to provide cooling to integrated service modules, chilled beams, chilled ceilings, underfloor cooling, for industrial processes and so on. The use of chilled water to cool the building fabric (rather than ventilation air) is sometimes described as 'active thermal mass'.
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	The exact opposite of the refrigeration process can be achieved by a heat pump, which reverses the cycle so that heat is supplied to the building rather than cooling. Some systems are reversible, able to supple either heat or cooling. See Heat pump for more information.		The exact opposite of the refrigeration process can be achieved by a heat pump, which reverses the cycle so that heat is supplied to the building rather than cooling. Some systems are reversible, able to supple either heat or cooling. See Heat pump for more information.

−	The temperature of chilled water will depend on the purpose for which it is being used. Chilled water supplying air handling units might be in the range of 4°C to 10°C, with the return temperature perhaps 5°C higher than the supply temperature. However, where a surface is being cooled, for example a chilled beam, a higher temperature might be sufficient because of the relatively larger cooling surface available. Typically 14°C to 17°C can be adequate. This higher temperature (no lower than 13°C) also helps prevent condensation forming on the cool surface.	+	The temperature of chilled water will depend on the purpose for which it is being used. Chilled water supplying air handling units might be in the range of 4°C to 10°C, with the return temperature perhaps 5°C higher than the supply temperature. However, where a surface is being cooled, for example a chilled beam, a higher temperature might be sufficient because of the relatively larger cooling surface available. Typically, 14°C to 17°C can be adequate. This higher temperature (no lower than 13°C) also helps prevent condensation forming on the cool surface.

	Closed chilled water systems may include additives such as corrosion inhibitors, biocides, and antifreeze. Pipework should be insulated to ensure efficient operation and prevent condensation.		Closed chilled water systems may include additives such as corrosion inhibitors, biocides, and antifreeze. Pipework should be insulated to ensure efficient operation and prevent condensation.
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	Chilled water storage (CWS), can be used when chiller units have spare capacity, such as during the night, with chilled water being stored in insulated tanks, to be used during peak load periods.		Chilled water storage (CWS), can be used when chiller units have spare capacity, such as during the night, with chilled water being stored in insulated tanks, to be used during peak load periods.

−	NB Refrigerants (rather than chilled water) can be used to provide cooling directly to spaces in variable refrigerant flow (VRF) systems. This is based on the flow of refrigerant between an external condensing unit and multiple internal evaporators (typically fan coil units). See ~~variable~~ refrigerant flow for more information.	+	NB: Refrigerants (rather than chilled water) can be used to provide cooling directly to spaces in variable refrigerant flow (VRF) systems. This is based on the flow of refrigerant between an external condensing unit and multiple internal evaporators (typically, fan coil units). See Variable refrigerant flow for more information.

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

	* Air conditioning.		* Air conditioning.
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	* Thermal storage for cooling.		* Thermal storage for cooling.
	* Variable refrigerant flow.		* Variable refrigerant flow.
		+	* Water vapour.

	[[Category:Products_/_components]]		[[Category:Products_/_components]]

Editor at 15:15, 24 March 2017

2017-03-24T15:15:00Z

← Older revision		Revision as of 15:15, 24 March 2017
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−
	To help develop this article, click ‘Edit this article’ above.		To help develop this article, click ‘Edit this article’ above.

−	----	+	-----
−		+
	Chilled water is commonly used in buildings to provide cooling.		Chilled water is commonly used in buildings to provide cooling.

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	Chilled water is typically provided by absorption refrigeration or compression refrigeration:		Chilled water is typically provided by absorption refrigeration or compression refrigeration:
−	*In compression systems, a liquid refrigerant with a low boiling point absorbs heat from the return water and boils in an evaporator to form a gas. The resulting gas is then compressed, which increases its temperature further. The gas is then condensed, releasing its latent heat which is rejected. The process then repeats.	+
−	*Absorption refrigeration works on a similar basis, however, in this case, the refrigerant gas is absorbed in a solution which is then heated in a ‘generator’ so that the refrigerant evaporates again, but this time at a higher pressure and temperature. The gas is then condensed, releasing its latent heat which is rejected. The process then repeats.	+	* In compression systems, a liquid refrigerant with a low boiling point absorbs heat from the return water and boils in an evaporator to form a gas. The resulting gas is then compressed, which increases its temperature further. The gas is then condensed, releasing its latent heat which is rejected. The process then repeats.
		+	* Absorption refrigeration works on a similar basis, however, in this case, the refrigerant gas is absorbed in a solution which is then heated in a ‘generator’ so that the refrigerant evaporates again, but this time at a higher pressure and temperature. The gas is then condensed, releasing its latent heat which is rejected. The process then repeats.

	The rejection of heat from chiller units can be achieved by:		The rejection of heat from chiller units can be achieved by:
−	*Air cooling, which rejects heat to the outside air by circulating it through the condenser.	+
−	*Evaporative cooing, which uses the addition of water mist to the air to enhance the cooing effect.	+	* Air cooling, which rejects heat to the outside air by circulating it through the condenser.
−	*Water cooling, which is generally suited to large systems and requires connection to cooling towers.	+	* Evaporative cooing, which uses the addition of water mist to the air to enhance the cooing effect.
		+	* Water cooling, which is generally suited to large systems and requires connection to cooling towers.

	Heat recovery can be used to allow the rejected heat from chiller units to be re-used for space heating or to provide hot water.		Heat recovery can be used to allow the rejected heat from chiller units to be re-used for space heating or to provide hot water.
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Air conditioning.	+
−	*Air handling unit.	+	* Air conditioning.
−	*Chilled beam.	+	* Air handling unit.
−	*Chiller unit.	+	* Chilled beam.
−	*Cooling.	+	* Chiller unit.
−	*Condensation.	+	* Cooling.
−	*Heating ventilation and air conditioning.	+	* Condensation.
−	*Heat pump.	+	* Gasket.
−	*Integrated service module.	+	* Heating ventilation and air conditioning.
−	*Refrigerant selection.	+	* Heat pump.
−	*Refrigeration.	+	* Integrated service module.
−	*Thermal storage for cooling.	+	* Refrigerant selection.
−	*Variable refrigerant flow.	+	* Refrigeration.
		+	* Thermal storage for cooling.
		+	* Variable refrigerant flow.

	[[Category:Products_/_components]]		[[Category:Products_/_components]]