Heat load in buildings - Revision history

Designing Buildings at 07:28, 28 November 2022

2022-11-28T07:28:31Z

← Older revision		Revision as of 07:28, 28 November 2022
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	= Balance point =		= Balance point =

−	The term balance point refers to the external temperature below which a building is likely to need to be heated, and above which it is likely to need to be heated. This is the point at which the building’s heat gains (people, equipment, solar radiation and so on) are equal to its heat losses (through the building fabric).	+	The term balance point refers to the external temperature below which a building is likely to need to be heated, and above which it is likely to need to be heated to achieve the required internal temperature. This is the point at which the building’s heat gains (people, equipment, solar radiation and so on) are equal to its heat losses (through the building fabric).
		+
		+	It is important that a comfortable internal temperature is set with determining heat loads and balance points.

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =

Designing Buildings at 07:24, 28 November 2022

2022-11-28T07:24:32Z

← Older revision		Revision as of 07:24, 28 November 2022
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−	[[File:Fire-and-water-~~g872b95411 1280~~.jpg]]	+	[[File:Fire-and-water-g872b95411_1280.jpg\|link=File:Fire-and-water-g872b95411_1280.jpg]]

	= What is heat load? =		= What is heat load? =

	Heat load (or heating load) in relation to building physics refers to the amount of heating or cooling necessary to maintain the required temperature in a building or space within that building. This can be determined in relation either to the required heating or the required cooling.		Heat load (or heating load) in relation to building physics refers to the amount of heating or cooling necessary to maintain the required temperature in a building or space within that building. This can be determined in relation either to the required heating or the required cooling.
		+
		+	The use of passive design can reduce the heat load for a building.

	= Required heating =		= Required heating =
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	= Required cooling capacity =		= Required cooling capacity =

−	The term heat load can also refer to the capacity required from a cooling system to maintain the temperature in a building or space below a required level. This must take account of all potential heat-producing activities (heat sources)~~, including~~ solar radiation, people, lighting, kitchens, computers and other equipment, and so on.	+	The term heat load can also refer to the capacity required from a cooling system to maintain the temperature in a building or space below a required level. This must take account of all potential heat-producing activities (heat sources). This includes external heat sources such as solar radiation, and internal heat sources such as people, lighting, kitchens, computers and other equipment, and so on.

	For example, a data centre housing computers and servers will produce a certain heat load that derives from an electrical load. This heat load will have to be absorbed and conveyed to the exterior by the building’s cooling system. Once the heat load is quantified, building services engineers can design the necessary cooling system to ensure it can effectively keep the space at the desired temperature.		For example, a data centre housing computers and servers will produce a certain heat load that derives from an electrical load. This heat load will have to be absorbed and conveyed to the exterior by the building’s cooling system. Once the heat load is quantified, building services engineers can design the necessary cooling system to ensure it can effectively keep the space at the desired temperature.
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	For more information see: Cooling.		For more information see: Cooling.
		+
		+	= Balance point =
		+
		+	The term balance point refers to the external temperature below which a building is likely to need to be heated, and above which it is likely to need to be heated. This is the point at which the building’s heat gains (people, equipment, solar radiation and so on) are equal to its heat losses (through the building fabric).

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =

Designing Buildings at 07:15, 28 November 2022

2022-11-28T07:15:12Z

← Older revision		Revision as of 07:15, 28 November 2022
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−	{\|	+	[[File:Fire-and-water-g872b95411 1280.jpg]]
−	\| [[File:~~Thermal_comfort.jpg\|link=File:Thermal_comfort~~.jpg]]	+
−	\|}	+

−	= ~~Introduction~~ =	+	= What is heat load? =

−	Heat load (or heating load) is a ~~term~~ that can be ~~used~~ in ~~several ways when dealing with building physics~~.	+	Heat load (or heating load) in relation to building physics refers to the amount of heating or cooling necessary to maintain the required temperature in a building or space within that building. This can be determined in relation either to the required heating or the required cooling.

	= Required heating =		= Required heating =

−	It can be used to refer to the quantity of heat per unit of time (usually over an hour) that is required to heat a given space in order to maintain it at a given temperature. In poorly insulated buildings, the heat load will be greater than in thermally efficient buildings. In contrast, in a building with a very high level of thermal efficiency, the heating demand can be practically negligible. In Passive houses, this is around 10W/m2 which is roughly 10% of the energy used in conventional buildings.	+	It can be used to refer to the quantity of heat per unit of time (usually over an hour) that is required to heat a given space in order to maintain it at a given temperature. In poorly insulated, poorly sealed buildings, the heat load will be greater than in thermally efficient buildings. In contrast, in a building with a very high level of thermal efficiency, the heating demand can be practically negligible. In Passive houses, this is around 10W/m2 which is roughly 10% of the energy used in conventional buildings.
		+
		+	For more information see: Heating.

	= Required cooling capacity =		= Required cooling capacity =

−	The term heat load can also refer to ~~a calculated thermal quantity used to establish~~ the capacity of a cooling system ~~to enable it~~ to maintain the temperature ~~below a required level~~ in a building or space. ~~To do this, it is necessary to~~ account ~~for~~ all potential heat-producing activities (heat sources), including solar radiation, people~~, machines~~, lighting, kitchens, computers, and so on ~~within that building or space~~.	+	The term heat load can also refer to the capacity required from a cooling system to maintain the temperature in a building or space below a required level. This must take account of all potential heat-producing activities (heat sources), including solar radiation, people, lighting, kitchens, computers and other equipment, and so on.

−	For example, a data centre housing computers and servers will produce a certain heat load that derives from an electrical load. This heat load will have to be absorbed and conveyed to the exterior by the building’s cooling system. Once the heat load is quantified, ~~HVAC~~ engineers can design the necessary cooling system to ensure it can effectively keep the space at the desired temperature.	+	For example, a data centre housing computers and servers will produce a certain heat load that derives from an electrical load. This heat load will have to be absorbed and conveyed to the exterior by the building’s cooling system. Once the heat load is quantified, building services engineers can design the necessary cooling system to ensure it can effectively keep the space at the desired temperature.

	A rough and ready method for calculating heat load in offices containing 2-3 workers and 3-4 computers is given by the following formula:		A rough and ready method for calculating heat load in offices containing 2-3 workers and 3-4 computers is given by the following formula:
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	* Heat load (BTU) = Length (m) x Width (m) x Height (m) x 141		* Heat load (BTU) = Length (m) x Width (m) x Height (m) x 141
	* So, for a room measuring 5m x 4m x 3m = 60 > x 141 = 8,460 BTU.		* So, for a room measuring 5m x 4m x 3m = 60 > x 141 = 8,460 BTU.
−	* (For measurements in feet, the formula becomes:	+	* (For measurements in feet, the formula becomes: Heat load (BTU) = Length (m) x Width (m) x Height (m) x 4)
−	* Heat load (BTU) = Length (m) x Width (m) x Height (m) x 4)	+

	Where there are more occupants, add 500 BTU for every additional person:		Where there are more occupants, add 500 BTU for every additional person:
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	The method described above can provide an outline idea of the heat load. More detailed methods should be used to achieve greater accuracy.		The method described above can provide an outline idea of the heat load. More detailed methods should be used to achieve greater accuracy.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	For more information see: Cooling.
		+
		+	= Related articles on Designing Buildings =

	* Air handling unit.		* Air handling unit.
−	* Approved documents.
	* Building services.		* Building services.
	* Cooling.		* Cooling.
−	* Fan coil unit.
	* Heat meter.		* Heat meter.
	* Heat metering.		* Heat metering.
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	* HVAC.		* HVAC.
	* Low carbon heating and cooling.		* Low carbon heating and cooling.
−	* Mechanical, electrical and plumbing MEP.
	* Overheating.		* Overheating.
	* Radiant heating.		* Radiant heating.
−	* Radiator.
	* Thermal comfort.		* Thermal comfort.
	* Types of heating system.		* Types of heating system.

	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]]		[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]]

84.69.178.71 at 09:22, 24 August 2022

2022-08-24T09:22:41Z

← Older revision		Revision as of 09:22, 24 August 2022
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	= Required heating =		= Required heating =

−	It can be used to refer to the quantity of heat per unit of time (usually over an hour) that is required to heat a given space in order to maintain it at a given temperature. In poorly insulated buildings, the heat load will be greater than in thermally efficient buildings. In contrast, in a building with a very high level of thermal efficiency, the heating demand can be practically negligible. In Passive houses, this is around ~~15kWh~~/~~(m2a))~~ which is roughly 10% of the energy used in conventional buildings.	+	It can be used to refer to the quantity of heat per unit of time (usually over an hour) that is required to heat a given space in order to maintain it at a given temperature. In poorly insulated buildings, the heat load will be greater than in thermally efficient buildings. In contrast, in a building with a very high level of thermal efficiency, the heating demand can be practically negligible. In Passive houses, this is around 10W/m2 which is roughly 10% of the energy used in conventional buildings.

	= Required cooling capacity =		= Required cooling capacity =

Designing Buildings: moved Heat load to Heat load in buildings

2021-01-16T08:35:26Z

moved Heat load to Heat load in buildings

← Older revision

Revision as of 08:35, 16 January 2021

Designing Buildings at 08:35, 16 January 2021

2021-01-16T08:35:09Z

← Older revision		Revision as of 08:35, 16 January 2021
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	* Types of heating system.		* Types of heating system.

−	[[Category:Theory]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]]

Designing Buildings at 09:49, 13 September 2019

2019-09-13T09:49:30Z

← Older revision		Revision as of 09:49, 13 September 2019
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	\|}		\|}

−	~~Heat load (or heating load) is a term that can be used in several ways when dealing with thermal quantities in building physics.~~	+	= Introduction =

−	~~It can be used to refer to the quantity of heat per unit of time~~ (~~usually over an hour~~) ~~that~~ is ~~required to heat~~ a ~~given space~~ in ~~order to maintain it at a given temperature~~.	+	Heat load (or heating load) is a term that can be used in several ways when dealing with building physics.

−	In poorly insulated buildings, the heat load will be greater than in thermally efficient buildings as, while heat is supplied, the rise in temperature may not reach a high enough level due to the simultaneous heat loss through the building fabric.	+	= Required heating =

−	In contrast, in a building with a very high level of thermal efficiency, the heating demand ~~will~~ be practically negligible. In Passive houses, this is around 15kWh/(m2a)) which is roughly 10% of the energy used in conventional buildings. ~~Therefore, in such houses it should be possible to attain energy savings of around 90%~~	+	It can be used to refer to the quantity of heat per unit of time (usually over an hour) that is required to heat a given space in order to maintain it at a given temperature. In poorly insulated buildings, the heat load will be greater than in thermally efficient buildings. In contrast, in a building with a very high level of thermal efficiency, the heating demand can be practically negligible. In Passive houses, this is around 15kWh/(m2a)) which is roughly 10% of the energy used in conventional buildings.

−	= ~~Calculating the required~~ cooling capacity =	+	= Required cooling capacity =

−	The term heat load can also refer to a calculated thermal quantity used to establish the capacity of a cooling system to enable it to maintain the temperature ~~down at the~~ required level in a building or space. To do this, it is necessary to account for all potential heat-producing activities, including solar radiation, people, machines, lighting, kitchens ~~and~~ computers, within that building or space.	+	The term heat load can also refer to a calculated thermal quantity used to establish the capacity of a cooling system to enable it to maintain the temperature below a required level in a building or space. To do this, it is necessary to account for all potential heat-producing activities (heat sources), including solar radiation, people, machines, lighting, kitchens, computers, and so on within that building or space.

	For example, a data centre housing computers and servers will produce a certain heat load that derives from an electrical load. This heat load will have to be absorbed and conveyed to the exterior by the building’s cooling system. Once the heat load is quantified, HVAC engineers can design the necessary cooling system to ensure it can effectively keep the space at the desired temperature.		For example, a data centre housing computers and servers will produce a certain heat load that derives from an electrical load. This heat load will have to be absorbed and conveyed to the exterior by the building’s cooling system. Once the heat load is quantified, HVAC engineers can design the necessary cooling system to ensure it can effectively keep the space at the desired temperature.
−
−	~~= Rule-of-thumb heat-load calculation =~~

	A rough and ready method for calculating heat load in offices containing 2-3 workers and 3-4 computers is given by the following formula:		A rough and ready method for calculating heat load in offices containing 2-3 workers and 3-4 computers is given by the following formula:
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	* Heat pump.		* Heat pump.
	* Heat recovery.		* Heat recovery.
−	* Heat ~~stress~~.	+	* Heat source.
	* Heat transfer.		* Heat transfer.
	* HVAC.		* HVAC.

Editor at 17:15, 22 August 2019

2019-08-22T17:15:48Z

← Older revision		Revision as of 17:15, 22 August 2019
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	{\|		{\|
−	\| [[File:~~Thermal comfort~~.jpg]]	+	\| [[File:Thermal_comfort.jpg\|link=File:Thermal_comfort.jpg]]
	\|}		\|}

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	* Heat stress.		* Heat stress.
	* Heat transfer.		* Heat transfer.
−	* Heatin large spaces.
	* HVAC.		* HVAC.
	* Low carbon heating and cooling.		* Low carbon heating and cooling.

Editor: Created page with "{| | File:Thermal comfort.jpg |} Heat load (or heating load) is a term that can be used in several ways when dealing with thermal quantities in building physics. It can be ..."

2019-08-22T17:14:49Z

Created page with "{| | File:Thermal comfort.jpg |} Heat load (or heating load) is a term that can be used in several ways when dealing with thermal quantities in building physics. It can be ..."

New page

{|
| [[File:Thermal comfort.jpg]]
|}

Heat load (or heating load) is a term that can be used in several ways when dealing with thermal quantities in building physics.

It can be used to refer to the quantity of heat per unit of time (usually over an hour) that is required to heat a given space in order to maintain it at a given temperature.

In poorly insulated buildings, the heat load will be greater than in thermally efficient buildings as, while heat is supplied, the rise in temperature may not reach a high enough level due to the simultaneous heat loss through the building fabric.

In contrast, in a building with a very high level of thermal efficiency, the heating demand will be practically negligible. In Passive houses, this is around 15kWh/(m2a)) which is roughly 10% of the energy used in conventional buildings. Therefore, in such houses it should be possible to attain energy savings of around 90%

= Calculating the required cooling capacity =

The term heat load can also refer to a calculated thermal quantity used to establish the capacity of a cooling system to enable it to maintain the temperature down at the required level in a building or space. To do this, it is necessary to account for all potential heat-producing activities, including solar radiation, people, machines, lighting, kitchens and computers, within that building or space.

For example, a data centre housing computers and servers will produce a certain heat load that derives from an electrical load. This heat load will have to be absorbed and conveyed to the exterior by the building’s cooling system. Once the heat load is quantified, HVAC engineers can design the necessary cooling system to ensure it can effectively keep the space at the desired temperature.

= Rule-of-thumb heat-load calculation =

A rough and ready method for calculating heat load in offices containing 2-3 workers and 3-4 computers is given by the following formula:

* Heat load (BTU) = Length (m) x Width (m) x Height (m) x 141
* So, for a room measuring 5m x 4m x 3m = 60 > x 141 = 8,460 BTU.
* (For measurements in feet, the formula becomes:
* Heat load (BTU) = Length (m) x Width (m) x Height (m) x 4)

Where there are more occupants, add 500 BTU for every additional person:

So, if four extra occupants arrive, the heat load will be:

* 8,460 + (500 x 4) = 10,460 BTU.

Heat load (and heat gain) can also be expressed in kilowatts (kW).

* To convert BTU to kW, 1 BTU = 0.00029307107 kW.
* So, from the example above, 10,460 BTU = 3.065 kW.

The method described above can provide an outline idea of the heat load. More detailed methods should be used to achieve greater accuracy.

= Related articles on Designing Buildings Wiki =

* Air handling unit.
* Approved documents.
* Building services.
* Cooling.
* Fan coil unit.
* Heat meter.
* Heat metering.
* Heat pump.
* Heat recovery.
* Heat stress.
* Heat transfer.
* Heatin large spaces.
* HVAC.
* Low carbon heating and cooling.
* Mechanical, electrical and plumbing MEP.
* Overheating.
* Radiant heating.
* Radiator.
* Thermal comfort.
* Types of heating system.

[[Category:Theory]]