CO 2 based refrigeration systems for supermarkets. Århus 03. Dec Kim G. Christensen

Transkript

1 CO 2 based refrigeration systems for supermarkets Århus 03. Dec Kim G. Christensen

2 About ADVANSOR ADVANSOR is a new Company specialized in CO 2 -technologies within the fields of refrigeration and heat pumps. Advansor has more than 15 years experience with CO 2 as refrigerant ADVANSOR develops, manufacturers and sell projects within Combined Heating and Power Process industry Food industry Supermarkets Our products are: Heat pumps kw Chillers kw Supermarket refrigeration 6/15 50/150 kw Costumer specified products Engineering, design, production of series of 5-10 units We work closely together with partners and suppliers and have cooperation with Danish associations, private research institutes and universities, EPA and the Ministry of Transport and Energy as well as the Danish Industry

3 ADVANSOR s products compheat: CHP combined heat and power Advansor develops heat pump solutions dedicated to power plants operated by either gas motor or gas turbines. The heat pump produces hot water up to 90 C which enables direct pipe connection to the external pipe work with no interference with the motor and piping. compbine: Combined heating and cooling Combined heating and cooling - produce hot water up to 100 C and get ice water for free or counter wise. Advansor s product line is highly suitable in connection with pasteurisation, CIP systems and other application in food industry where coinciding demands for heating and cooling exist. Combined heating and cooling saves both capital investment and energy cost. compfort: Chiller applications Advansor offers highly compact water cooled chillers in the range from 100 to 400 kw. With natural refrigerant, no toxic risk and no flammability this is a safe and economical feasible choice. compsuper: Refrigeration applications Advansor offers refrigeration systems (compressor rack s) for supermarkets and other commercial/ industrial applications. The units work with as the only refrigerant. Main focus are placed on reliability, ease of service and low energy consumption.

4 Karakteristika for CO 2 Generelle egenskaber: Gruppe II (L1) med ODP = 0 + GWP = 1 (NH 3 = L2, R290 = L3) Ingen begrænsninger på opstillingssted og anvendelse Temperatur og trykområde: -55 -> +31 C (5.5 -> 73 Bar) Tungere end luft, i det hele taget en tung gas Fordele: Små rørdimensioner og små tryktab CO 2 Bedre virkningsgrader på kompressorer og høj volumetrisk kølekapacitet Bedre varmeovergang specielt ved pool-boiling Udfordringer: Højere tryk (op til 130 bar) Høje stilstandstryk Anvendelse af sikkerhedsventiler Udskilning af olie/ væske-dråber fra CO 2 -gassen Sikring af anlæggets COP ved høje temperaturer Pris på komponenter

5 Præsentation af compsuper compsuper er et nyt produkt som er resultatet af mere end 10 års udviklingsarbejde med supermarkedsanlæg Produktet er udviklet med fokus på : pålidelighed, temperaturkvalitet og billig drift Produktet kombinerer den seneste viden indenfor anvendelsen af CO 2 som kølemiddel samt et massivt udviklingsarbejde (patenter, lovgivning, systemberegninger, design, 3D-CAD, produkt- og produktionsmodning) Anlægget er designet til forholdene i skandinaviske supermarkeder Kun ét kølemiddel CO 2 Både transkritisk og underkritisk Elektronisk oliestyring Optimeret kondensator/ gaskøler Adiabatisk befugtning på kondensator Kapacitetsregulering 3-8 trin Håndtering af stilstandstryk Sugemanifold - multifunktion Sikker drift og høj pålidelighed

6 Fundamental design and considerations High pressure side/ low pressure side 100 and 40/25 bar Standstill pressure for receiver 90 bar (refrigerant stays on the system) Hermetic solutions Semihermetic compressors Welded carbon steel Choice of materials Carbon steel (welded) and elastomers suitable for CO 2 Suction gas filters Filter driers to remove water from the system Advanced oil management Oil cooling Oil separator with filter (99.98 % oil separation) Oil level control Sugemanifold with integrated oil cooler Integrated oil cooling, liquid seperator and oil return

7 Fundamental design and considerations Best reliability in the market System design take into account the behavior of CO 2 (design for CO2) Oil-handling system for perfect oil management Suction manifold designed for oil cooling, oil return and liquid separation Suction accumulator suction side of low pressure receiver System design (for low energy consumption) Optimized compressor design and optimized o gas-cooler design Adiabatic humidification of the gas-cooler Heat recovery is integrated on request Ease of maintenance Metal- and Teflon hoses for connection of the compressor Oil re-fill during operation, changeable oil-filter and filter-drier Compressor rack designed for easy entry and modular design of racks Safety issues The system is CE-marked from the manufacturer Pressostats and safety valves All design specifications are satisfied Mechanical: MD(98/37/EC) / PED(97/23/EC) / EN378 / EN13480 / EN13445 Electrical: LVD(06/95/EC) / EMC(89/336/EC) / EN User guide and education for the installer

8 Transkritisk anlæg compsuper Kølekompressorer 4-6 kompressorer Kondensator/ gaskøler Højtryksventil Kølemøbler/ rum Receiver Bypass ventil Frostmøbler/ rum Frostkompressorer 2-3 kompressorer

9 compsuper - S

10 compsuper - L

11 compsuper - L

12 Kæmpe fordele ved kondensator/ gaskøler vs. tørkøler Tørkøler-installation (PG): Kapacitet: 280 kw 5x3xØ800 blæsere Dårlige luftforhold Tilslutninger 5x2xDN65 Foot-print: 10x5 m 2 = 50 m 2 Kondensator/ gaskøler installation (CO2): Kapacitet: 235 kw 6xØ600 blæsere Optimale luftforhold (større temperaturdiff) Tilslutninger 2xDN25 Foot-print: 4,0x2,2 m 2 = 8,8 m 2

13 Varmegenvinding fra CO 2 - køleanlæg % Trykgas [C] Trykgastemperatur Andel VGV af Q_c 40% 35% 30% 25% 20% 15% 10% 5% Andel af Q_c der genvindes 0 0% COP_NH3 COP_propan COP_CO2 T_e = -10C eta_is = 0,65 T_c = 20C T_VGV = 22C

14 COP sammenligning med andre anlæg 4,00 3,50 COP (design) COSP 3,00 COP [-] 2,50 2,00 1,50 1,00 0,50 0,00 Ét-trinsanlæg (FAKTA scroll) R134a/brine/CO2 (TP) CO2/CO2 - compsuper R134a/CO2 - CO2-pump

15 T_luft dt_oh_køl T_tryk_køl T_0_køl Kap_køl T_C_køl : : : : : : : :45

16 Fordele ved compsuper Høj sikkerhed Pålidelig drift Nem installation Billig drift Sikkerhedsventiler og pressostater Fremstillings- og opstillinsgodkendt CE-mærket i hht. PED kat. IV Højt niveau for dokumentation Gennemtestede komponenter (komp, olie, sugeman) Styring og overvågning af del-systemer herunder olie Sikker forsyning af komponenter God kapacitetsregulering (stabile temperaturer) Håndtering af stilstandstryk Kun ét kølemiddel CO 2 Optimeret design (overgange til kobber, fødder) Høj og ensartet kvalitet Kan opstilles alle steder og ingen krav til plac. af kond. Lavt energiforbrug Billigt kølemiddel nemt og hurtigt at håndtere Nem og hurtig service