Fault Detection and Diagnostics for Rooftop Air Conditioners
Fault Detection and Diagnostics for Rooftop Air Conditioners
Fault Detection and Diagnostics for Rooftop Air Conditioners
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Table of Contents<br />
1 Introduction.....................................................................................................................5<br />
2 Literature review of HVAC system FDD ....................................................................7<br />
2.1 Overview..................................................................................................................7<br />
2.2 Latest progress........................................................................................................8<br />
2.2.1 Packaged air conditioning systems......................................................................8<br />
2.2.2 Other HVAC systems.........................................................................................11<br />
2.3 Future prospects ........................................................................................................14<br />
3 Description of FDD technique.....................................................................................16<br />
3.1 Overview................................................................................................................16<br />
3.2 Measurement Preprocessing ....................................................................................18<br />
3.2.1 Measurement filter .............................................................................................18<br />
3.2.2 Steady-state detector ..........................................................................................18<br />
3.3 Steady-state models..............................................................................................20<br />
3.3.1 Normal state models...........................................................................................21<br />
3.3.2 Overall per<strong>for</strong>mance models..............................................................................21<br />
3.4 <strong>Fault</strong> detection ......................................................................................................23<br />
3.4.1 Probability method.............................................................................................25<br />
3.4.1.1 Independence assumption ..................................................................... 25<br />
3.4.1.2 Monte-Carlo (MC) simulation method ................................................. 27<br />
3.4.2 Normalized distance method .............................................................................28<br />
3.5 <strong>Fault</strong> diagnosis ......................................................................................................30<br />
3.5.1 <strong>Fault</strong> diagnosis rules...........................................................................................31<br />
3.5.2 <strong>Fault</strong> diagnosis classification .............................................................................31<br />
3.5.2.1 Probability Method ............................................................................... 32<br />
3.5.2.2 Distance method.................................................................................... 34<br />
3.6 <strong>Fault</strong> evaluation <strong>and</strong> decision .............................................................................37<br />
4 Case study <strong>and</strong> method comparisons.........................................................................40<br />
4.1 Measurement preprocessing ...............................................................................40<br />
4.2 Normal state <strong>and</strong> overall per<strong>for</strong>mance models.................................................41<br />
4.2.1 Normal state models...........................................................................................41<br />
4.2.2 Overall per<strong>for</strong>mance models..............................................................................42<br />
4.3 <strong>Fault</strong> detection <strong>and</strong> diagnosis..............................................................................48<br />
4.3.1 <strong>Fault</strong> detection ....................................................................................................48<br />
4.3.2 <strong>Fault</strong> diagnosis rules...........................................................................................48<br />
4.3.3 <strong>Fault</strong> diagnosis method ......................................................................................49<br />
4.4 FDD results <strong>and</strong> comparisons with previous method......................................49
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