28Mar2011 www.fahrenergy.co.uk P: 1 MeasuringEfficiency.doc Copyright FAHRenergy Ltd. 2005 to 2013 Measuring And Understanding Energy Efficiency Knowledge makes the difference. It is the base for improvements. INSTRUMENTS NEEDED .......................................................................................................................................... 1 INTRODUCTION ......................................................................................................................................................... 2 ENERGY RECOVERY DEPENDS ON TEMPERATURE DIFFERENCE.................................................................................. 3 MEASURING TEMPERATURE AND HUMIDITY ................................................................................................ 4 THE LOFT .................................................................................................................................................................... 4 Humidity On The Loft ............................................................................................................................................ 4 Sun Energy From The Loft..................................................................................................................................... 5 How Much Energy Is Collected From The Loft? ................................................................................................... 7 CALCULATING THE HRV SYSTEM EFFICIENCY............................................................................................. 8 COMPENSATED EFFICIENCY ........................................................................................................................................ 8 AVERAGE EFFICIENCY................................................................................................................................................. 9 EFFICIENCY AND HUMIDITY ....................................................................................................................................... 9 LONG TERM HOUSE EFFICIENCY ............................................................................................................................... 10 TOO HIGH EFFICIENCY .............................................................................................................................................. 12 Instruments Needed USB thermal and humidity datalogger http://uk.rs- online.com/web/search/searchBrowseAction.html?method=getProduct&R=4901064&cm_vc=av_ uk A USB datalogger is the one which may be left in a ventilation duct. Note: • Common low price thermometers are non-linear. The tolerance changes with temperature • Professional thermometers keep the tolerance throughout the range Wattmeter Nomenclature: FAI = Fresh Air Into the HRV FAO = Fresh Air Out of the HRV OAI = Old Air Into the HRV OAO = Old Air Out of the HRV
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28Mar2011 www.fahrenergy.co.uk P: 1
MeasuringEfficiency.doc Copyright FAHRenergy Ltd. 2005 to 2013
Measuring And Understanding Energy Efficiency
Knowledge makes the difference. It is the base for improvements.
ENERGY RECOVERY DEPENDS ON TEMPERATURE DIFFERENCE.................................................................................. 3
MEASURING TEMPERATURE AND HUMIDITY ................................................................................................ 4
THE LOFT .................................................................................................................................................................... 4
Humidity On The Loft ............................................................................................................................................ 4
Sun Energy From The Loft..................................................................................................................................... 5
How Much Energy Is Collected From The Loft? ................................................................................................... 7
CALCULATING THE HRV SYSTEM EFFICIENCY............................................................................................. 8
AVERAGE EFFICIENCY................................................................................................................................................. 9
EFFICIENCY AND HUMIDITY ....................................................................................................................................... 9
LONG TERM HOUSE EFFICIENCY ............................................................................................................................... 10
TOO HIGH EFFICIENCY .............................................................................................................................................. 12