Full Range of Applications with High Efficiency Subcritical and Transcritical CO2 Compressors Brunel University – Thursday 23rd January 2014 GEA Refrigeration Technologies Environmentally-friendly Refrigeration Technology • GEA Refrigeration Technologies general commitment to use natural refrigerants • Responsibility to an economic use of resources and energies • GEA Bock is the first compressor manufacturer which has used the environmentally-friendly refrigerant CO2 since the 1990s • GEA Bock EFC-System allows up to 25 % less power consumption • Long lifetime of the products as an essential part of the company concept 2 GEA Refrigeration Technologies Overview 1 Semi-hermetic CO2 (R744) compressors Subcritical 2 Semi-hermetic CO2 (R744) compressors Transcritical 3 3 References GEA Refrigeration Technologies Overview CO2 Compressors at GEA Bock Program for subcritical CO2 compressors HGX12/…, HGX22/…, HGX34/… HGX4/… CO2 Program for transcritical CO2 compressors HGX2…, 4 HGX34…, HGX46… CO2 T GEA Refrigeration Technologies Subcritical CO2 Compressors HGX12e CO2 5 HGX22P CO2 HGX34P CO2 HGX4 CO2 GEA Refrigeration Technologies Subcritical CO2 Compressors – Optimization New operating limits HGX12e CO2 tc [°C] 20 Operating conditions of the compressors 15 tc 10 5 to tcom_out 0 HGX22e/ HGX34e/ HGX44e CO2 will follow during this year -5 -10 -15 -20 -25 -60 -50 -40 -30 -20 -10 to [°C] Max. pressure HG12-HG34 CO2: LP / HP 40 / 55 bar (HG4: LP / HP 27 / 55 bar) 6 Discharge temperature: 140°C → 160°C GEA Refrigeration Technologies Subcritical CO2 Compressors – Product range Displacement m3/h 2,1 kW Qo @ -35°C 84 kW New HGX12e Swept volume cm3 7 GEA Refrigeration Technologies Overview 1 Semi-hermetic CO2 (R744) compressors Subcritical 2 Semi-hermetic CO2 (R744) compressors Transcritical 3 8 References GEA Refrigeration Technologies Transcritical CO2 Compressors HGX2 CO2 T – 2 cylinder 6,2 – 9,6 m3/h HGX34 CO2 T – 4 cylinder 9,9 - 20,1 m3/h 9 HGX46 CO2 T – 6 cylinder 21,8 -30,2 m3/h GEA Refrigeration Technologies Transcritical CO2 Compressors Compressors designed for CO2 with particular focus on: 1. Safety 2. Efficiency 3. Durability 4. Operating / Service 10 GEA Refrigeration Technologies Transcritical CO2 Compressors – Highlights Low oil carry over Designed for transcritical • • < 0,5 % (60 Hz) CO2 pressures < 0,2 % (50 Hz) • • LP 100 bar HP 150 bar Highest COP / EER Compared to competitors Oil pump • • Optimal oil circulation Oil pressure control (optional) Motors for variable speed control Operating conditions for each application • • • 11 ML – Medium & low temp application S – Strong motor SH – High evaporating conditions (e.g. heat pump) • • 25-70 Hz Supermarket applications < to = 10°C Frequency range 20-70 Hz Optimized drive gear GEA Refrigeration Technologies Operating Limits & Compressor Version Type of compressors: ML : Medium & low operating conditions • Limited max current & max. power consumption • e.g. in supermarket application • Oil charge C85E S: Expended operating conditions • Stronger motor • Higher operating pressures • Wide frequency range up to 70 Hz • Oil charged C85E SH: Heat pump application po > 40 bar • High evaporating conditions • Oil charge C150E HGX34 CO2 T 13 & HGX46 CO2 T GEA Refrigeration Technologies Comparison in efficiency with Competitor Competitor data from product information and calculation software + 9,5 % + 3,8 % + 7,6 % Operation conditions (EN 12900): 1) to/tga -10/+35°C(90bar) GEA Bock: HGX34/110-4 S CO2 T (9,9 m3/h) 3) to/tga +5/+25°C(100bar) 14 2) to/tc -10/+15°C(50,8bar) GEA Refrigeration Technologies CO2 Rack System – with Frequency Converters Qo_LT Low temperature (to = -35°C) Qc_LT Pc_sub. (25)30-70 Hz 50 Hz Medium temperature (to = -10°C) Qc_all 50 Hz Qc_LT + Qo_MT Pc_trans. 20-70 Hz 15 50 Hz 50 Hz 50 Hz GEA Refrigeration Technologies 16 10-140 % stepless Range of control Frequency Controlled System 140 10 GEA Refrigeration Technologies Overview Advantages Compressor with 20-70 Hz Minimal frequency of 20 Hz vs. 30 Hz + + + + Better compressor adjustment on capacity demand Reduced start/stops of the compressor Higher reliability of the frequency controlled compressor Higher average evaporating temperature -> higher system efficiency Maximum frequency of 70 Hz vs. 87 Hz + + + + + + 17 Energy saving only < 50 Hz High efficiency 400 V (87 Hz 230 V) electrical motor in the main comp. No special electrical motor is requested Reduced noise level Reduced oil carry over 20-70 Hz -> ∆ 50 Hz available for second compressor GEA Refrigeration Technologies Displacement m3/h Transcritical CO2 Compressors – Product range 345 Swept volume cm3 2-cylinder compressor HGX2 CO2 T 4-cylinder compressor HGX34 CO2 T 6-cylinder compressor HGX46 CO2 T 18 GEA Refrigeration Technologies Compressor Selection Program Available as: • Online Version • Offline Version Can be found on: www.bock.de 19 GEA Refrigeration Technologies
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