Editor: moved Plant size ratio to Plant size ratio PSR

2025-12-07T07:28:27Z

moved Plant size ratio to Plant size ratio PSR

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Revision as of 07:28, 7 December 2025

Editor at 07:11, 7 December 2025

2025-12-07T07:11:05Z

← Older revision		Revision as of 07:11, 7 December 2025
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		+	The plant size ratio (PSR) is the nominal heat output of a heating plant divided by the design heat loss (the average heat loss of the building on a cold day with a temperature differential of 24.2°C).

		+	Note: The heating plant emission rate includes any auxiliary space and water heating that may be necessary, i.e. it represents the performance of all heating plant needed to provide space and water hating service to the building, assuming a standard demand pattern. For a given heat demand, the plant size ratio determines the part-load condition for the heating plant.

−	[[Category:~~Articles_needing_more_work~~]]	+	The SAP Supporting Document:: "[https://www.ncm-pcdb.org.uk/sap/filelibrary/pdf/Calculation_Methodology/SAP_2012/CALCM-01---SAP-REVISED-HEAT-PUMP-PERFORMANCE-METHOD---V1.2.pdf Calculation Method: CALCM:01. SAP Revised heat pump performance method Issue 1.2]" published by BRE 5 September 2017 mentions Plant Size Ratio (PSR) thus:
		+
		+	"Heat pump annual performance calculations were first introduced in SAP 2005 via a SAP Appendix Q procedure. In SAP 2009 they were adopted and included in a newly expanded SAP appendix (Appendix N) which includes provision for heat-led micro-cogeneration. Heat pumps were included in the same appendix as cogeneration because both technologies have an annual performance that is highly dependent on the plant heating capacity divided by the design heat loss of a dwelling. This is known as the Plant Size Ratio (PSR)."
		+
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		+	[[Category:DCN_Definition]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Specification]] [[Category:DCN_Standard]] [[Category:Definitions]] [[Category:Publications_/_reports]] [[Category:Standards_/_measurements]] [[Category:Sustainability]]

Editor at 06:58, 7 December 2025

2025-12-07T06:58:38Z

← Older revision		Revision as of 06:58, 7 December 2025
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−	~~#redirect:~~[[~~Heating_plant_emission_rate\|Heating plant emission rate~~]]	+
		+
		+	[[Category:Articles_needing_more_work]]

Designing Buildings: Redirected page to Heating plant emission rate

2016-11-23T09:50:14Z

Redirected page to Heating plant emission rate

New page

#redirect:[[Heating_plant_emission_rate|Heating plant emission rate]]

Plant size ratio PSR - Revision history

Editor: moved Plant size ratio to Plant size ratio PSR

Editor at 07:11, 7 December 2025

Editor at 06:58, 7 December 2025

Designing Buildings: Redirected page to Heating plant emission rate