Influence of dry cooler capacity on chiller efficiency
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1 Influence of dry cooler capacity on chiller efficiency CHILLVENTA, Nurnberg 9 October 2012 Sandrine MARINHAS
2 2/22 Oct 2012 Influence of dry cooler capacity on chiller efficiency Overview Introduction: Eurovent Certification Company How does it work? Voluntary labelling Efficiencies Case study, results, energy savings Programme for Heat Exchangers for Refrigeration Conclusion
3 Eurovent Certification Company 3/22 17 certification programmes Heating (Heat pumps, Fan coil units, ) Ventilation (Air Handling Units, ) Air Conditioning (Air conditioners, Rooftops, Chillers, ) Refrigeration (DX Air Coolers, Refrigerated Display Cabinets, ) 17 years of existence National accreditation by COFRAC 250 manufacturers from more than 50 countries Large and small manufacturers are participating in each programme certified references with Model designation Characteristics (dimensions, refrigerant ) Performance ratings Available online, anytime:
4 4/22 Certification programmes Air conditionners Fan coils units Air filters Chilled Beams Refrigerated display cabinets Dry coolers Chillers Heat exchangers Air handling Units Rooftops Heat recovery systems Cooling towers Drift eliminators
5 How does it work? 5/22 Oct 2012 Declaration lists Product ranges (and models) + Technical characteristics & Performances or Selection software After study of the list Selection Random selection of models No. of tests based on lifetime of models or Selection software Delivery, verification of testing object Testing in an independent laboratory Comparison declared vs. measured data If necessary: correction of catalogues or software File rejected Review, Approval, certificate and Publication of data &
6 6/22 13 independant laboratories CEIS Madrid Spain CETIAT Lyon France DMT Essen Germany DTI Copenhaguen Danemark IMQ Amaro Italy IMQ Milan Italy SP Boras Sweden TÜV-NORD Essen Germany TÜV-SÜD Munich Germany VTT Espoo Finland WSP Stuttgart Germany TNO Apeldoorn Holland 2
7 Meaningful ratings and balanced distribution of classes are the key points Voluntary labelling within ECC How and by who is labelling prepared? Based on European testing standards (EN...) Rating prepared by industry We need to cover full range of the market 40% 35% 30% 40% 35% 30% 25% 25% 20% 15% 10% 5% 0% A B C D E F G 20% 15% 10% 5% 0% A B C D E F G
8 8/22 Liquid Chilling Packages or Chillers Machine able to produce chilled water Energy Efficiency Ratio (EER): Ratio of the total cooling capacity to the effective power input of the unit European Seasonal Energy Efficiency Ratio Load Rate (%) 100 % 75 % 50 % 25 % Air-cooled Water-cooled Air temperature at condenser inlet ( C) Water temperature at condenser inlet ( C) Weighting coefficients A=0.03 B=0.33 C=0.41 D=0.23 ESEER = A.EER 100% + B.EER 75% + C.EER 50% + D.EER 25%
9 9/22 Use of water-cooled chillers Efficiency of the solution Air-cooled chiller: finished product A water-cooled chiller Necessary to add a system able to reject heat Combination with a dry cooler Efficiency of the solution = Efficiency of the system +
10 10/22 How to represent the Efficiency of the system + EER* = Ratio of the total cooling capacity to (the effective power input of the unit + power consumption of the dry cooler fans) Pump power consumption is excluded
11 11/22 Power consumption of water-cooled chiller + dry cooler Dry cooler power consumption may change in a range between 10% and 20% according to the different working conditions
12 12/22 Seasonal efficiency of the system EER* = Ratio of the total cooling capacity to (the effective power input of the unit + power consumption of the dry cooler fans) Pump power consumption is excluded ESEER* = A.EER* 100% + B.EER* 75% + C.EER* 50% + D.EER* 25% +
13 13/22 Oct 2012 Case study Hypothesis 2 kinds of possible data True performance Self declaration self declared data could be anywhere in the data crowd Through yearly testing of samples, data certified by Eurovent Certification Company are more transparent comparable and reliable This study is comparing the behavior of systems Chiller + dry cooler certified by ECC Chiller + dry cooler NOT certified by ECC (assuming capacity gap = -25%)
14 14/22 Case study Conditions and figures Cooling capacity = 1145kW Leaving cold water temperature = 7 C Water temperature at condenser = 30/35 C Cooling capacity = 1030kW Leaving cold water temperature = 7 C Water temperature at condenser = 45/40 C Water-cooled chiller combined with dry cooler Noise level 60dB(A) at 10m AC fans
15 15/22 Dry Cooler NOT certified requires that chiller works: at 100%: higher condensing temperature at 75, 50, 25%: condensing temperatures are the same fan speed is higher
16 16/22 With Dry Cooler NOT certified: Fan consumption is higher System efficiency is lower, specially at high capacity ESEER* = 3.8 With Dry Cooler certified ESEER* = % difference!
17 17/22 Influence of free cooling In addition, in case free cooling is used in winter time the different behavior of dry coolers have to be considered We can assume other 3% efficiency difference
18 Energy and differences 18/22 Oct % difference City of Milan (cost 0,15 /kwh) Using a product which is certified by ECC can means a relevant energy saving 2940 /year
19 To put into perspective 2011 Chiller Market in EMEA
20 20/22 Certification programme for Air Cooled Condensers & Dry Coolers R Condensers, Dry coolers = Thermal capacity (DT1= 15K) Electrical power consumption Class Energy consumption Energy Ratio R A++ Remarkably low R 240 A+ Extremely low 160 R< 240 A Very low 110 R< 160 B Low 70 R< 110 C Medium 45 R< 70 D High 30 R< 45 E Very high R< 30 EN 327, EN 1048
21 21/22 Certification programme for DX Air Coolers R Thermal SC2 wet Fan power consumptio n DX air coolers = fin spacing 4.5 Class Energy consumption Energy Ratio R A++ Remarkably low R 45 A+ Extremely low 35 R< 45 A Very low 27 R< 35 B Low 21 R< 27 C Medium 16 R< 21 D High 12 R< 16 E Very high R< 12 EN 328
22 22/22 Oct 2012 Key benefits in one glance and best practice Easy product selection in HVAC-R Direct comparison of competitive products Good for customer, good for the planet New installations as well as retrofitting Less energy consumption as the unit runs as expected to achieve the required performance reduced product climate and environmental impact as well as electricity costs Task incentives for more energy savings (ex: France) In all cases, the best practice is the following Good design (avoid oversizing) ask for third party certified performances Good energy efficiency ask for third party certified best classes
23 Thank you for your attention
24 White certificates 24/ 2012 French white certificate scheme (Certificat d Econome d Energie CEE) By law energy suppliers are obliged to help their customers to save energy «Saved energy» is the number of kwh saved over the lifetime of the product / equipment generating the savings Standard operations are defined by public authorities ECC is quoted for condensers
25 Control, control... 25/22 Oct 2012 Low control can lead to an economic vicious circle low surveillance can lead to loss of market share of European manufacturers 68% of black-listed products come from ***** decrease of possibility of research so innovation SME s are even more fragile and need protection
26 26/22 Oct 2012 Synergies are possible in our sector Two complementary approaches Voluntary certification a pro-active initiative from manufacturers for a level playing field for performances allows to carry out a large number of tests for the 17 covered HVAC-R products (and new programmes under preparation) 17 years of experience Market surveillance other directives (pressure, refrigerants ) necessary to test non-certified products too Dentists are necessary but still you should brush your teeth regularly!
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