Store efficiency getting the most from each kilowatt-hour

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Lucas Carpenter
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1 Store efficiency getting the most from each kilowatt-hour Jonathan Swain Farm Energy Adrian Cunnington SBCSR Storage Workshop 1 st and 2 nd March 2012

2 Farm Energy Energy Consultancy specialising in agriculture Collaborating with SBCSR for PCL project R439 -assessing the impact on store efficiency Potato Council storage forum March

3 Why is efficiency important? Potato Council storage forum March

4 Key areas affecting energy use Store fabric Store equipment Store control Store management

5 8 stores tested Air leakage testing Ranged from very poor (processing) to very good (prepack) Sealed leakage areas and then progressively test Potato Council storage forum March

6 Air leakage -results Effective leakage area (m2) Before sealing After sealing Potato Council storage forum March

7 Air leakage -results Personnel doors & gassing holes Inlet louvres Equivalent leakage area (m 2 ) Outlet louvres Main doors Wall/floor joins Potato Council storage forum March

8 Discussion Importance in relation to crop quality Best practice to minimise leakage Impact on other factors: eg sprout suppressant use Potato Council storage forum March

9 Refrigeration system testing 8 stores tested Two processing stores; six prepack Test and then recommend improvements Potato Council storage forum March

10 Refrigeration results Store # Description Target produce Temp COP Store 2 Packaged unit with VSD compressor Store 4 Store 5 Portable' fridge unit with internal compressor and integrated condenser. Old system External drive Compressor and external condenser pack with air conditioning fan technology Store 7 Packaged compressor and condenser (external) Store 9 Store 10 Packaged unit Old and poorly maintained State of the art, sub cooling Heat recovery VSD compressors Electronic expansion valves Stores 11 & 12 Similar to Store Store 13 Packaged compressor and condenser 6 compressors with VSD on lead Staged condenser fans (8) Potato Council storage forum March

11 Refrigeration results Store # COP Suggested upgrades to improve performance Store Store Store Store Sub cooling Adjustment to expansion valves EC or VSD condenser fans Improve airflow to evaporators Alter TEV settings Install larger Condenser Stop recirculation of air Improve general airflow Site compressor outside of unit Install VSD or EC fans to control condensing pressure Alter TEV settings or install electronic expansion valves Adjust TEV or fit electronic valves Improve condenser fan control Fit EC or VSD condenser fans Fit VSD compressor Potential COP if upgraded (basically, install a new system!) Store New unit 3.94 Store Ground sink cooling for season performance Increased heat recovery Possibly install scroll compressors 4.7 Stores 11 & Store Smaller staged compressors VSD or EC condenser fans Defrost evaporators Adjust expansion valve Adjust condensing pressure control Fit sub cooling Reconfigure system for better airflow Alter condenser fan behaviour or fit VSD/EC fans Potato Council storage forum March

12 Refrigeration results Store # Description Target temp COP Potential COP if upgraded % improvement Store 2 Packaged unit with VSD compressor % Store 4 Portable' fridge unit with internal compressor and integrated condenser. Old system (basically - install a new system) 51% Store 5 Store 7 External drive Compressor and external condenser pack with air conditioning fan technology Packaged compressor and condenser (external) % % Store 9 Packaged unit Old and poorly maintained (basically - install a new system) 103% Store 10 State of the art, sub cooling Heat recovery VSD compressors Electronic expansion valves % Stores 11 & 12 Similar to Store % Store 13 Packaged compressor & condenser 6 compressors with VSD on lead Staged condenser fans (8) % Potato Council storage forum March

13 Discussion Factors behind these figures/impact on costs Refrigeration servicing: best practice F gas regulations and implications for the future Potato Council storage forum March

14 Thank You

BASE LEVEL AUDIT REQUIREMENTS REFRIGERATION SYSTEMS 1. SITE DATA COLLECTION. Business Name. Site physical address (Street, Suburb, City)

BASE LEVEL AUDIT REQUIREMENTS REFRIGERATION SYSTEMS 1. SITE DATA COLLECTION Business Name Site physical address (Street, Suburb, City) Nature of site / business operation Electricity Supplier Power factor