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Exclusivecompressor
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Jakarta 28-30 September 2017
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MORETHAN
EMPLOYEES160 PRESENTIN80countries
PRODUCTIONCAPACITYOF
60000COMPRESSORSPERYEAR
ITALY,CHINA,USAANDINDIA
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ANADVANTAGE THESIZEOFTHEWORLD
81YEARS OFINNOVATION
Nationalandinternationalconsolidation1stgenerationofsemihermeticreciprocatingcompressors
Firstscrewcompressorsinstallations2ndgenerationofsemihermeticreciprocatingcompressors
NewproductrangesCompactscrewcompressors,CO2,integratedVFD
InaugurationofFrascoldINDIAinAhmedabadAndAustralianOfficeinSidney
Frascoldisfounded
81yearsofhistory
Andmoreyettocome…
1970s1936 Today1990s 20122000s 2014
InaugurationofFrascoldUSAinSeattleAndFrascoldChinainShanghai
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FRASCOLD SpAItaly (1936)
Frascold India(2012)
Frascold Shanghai(2014)
Frascold USA(2014)
Sales office(2012)
Frascold SpARescaldina (MI)Headquarters and production
Frascold IndiaAhmedabadCond. unit assembly and warehouse
Frascold ShanghaiShanghaiSales office and warehouse
Frascold USASeattleSales office and warehouse
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Main Customers and References
Stationary Refrigeration
TEKO (Germany)
Racks and condensing units
Zanotti (Italy, Spain, UK)
Racks and condensing units
Rivacold (Italy)
Racks and condensing units
Tecumseh (FR, Indonesia, Brasil, USA)
Condensing Units
Carpigiani (Italy)
Ice Cream Machine
Comfort
Euroklimat (Italy) Chillers
Jonhson Controls (DK) Chillers
Kirloskar (India) Chillers
Thermocold (Italy) Chillers
Rhoss (Italy) Chillers
RC Group (Italy) Chillers
Geoclima (Italy) Chillers
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Main Customers and References
Mobile Cooling
Thermo King (Spain, USA, Brazil)
Refrigerated trucks
Carrier Transicold (France)
Refrigerated trucks
Zanotti (Italy)
Refrigerated trucks
Cold Car (Italy)
Refrigerated trucks
Transfrig (South Africa)
Refrigerated trucks
Siemens (Belgium)
Train A/C
Carrier (Korea)
Train A/C
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Branded Compressors
Thermo King (Semi‐hermetic and open reciprocating compressors)
Tecumseh (Semi‐hermetic reciprocating compressors)
Carrier (Semi‐hermetic reciprocating compressors)
Carrier Transicold (Semi‐hermetic reciprocating compressors)
Kirloskar Chillers (Semi‐hermetic compact screw compressors)
Lebrun (Semi‐hermetic compact screw compressors)
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Reciprocating Compressors
Standard Reciprocating Compressors Optimized for R134a
SK Models Sub‐CriticalCO2 Application
TK Models Trans‐Critical CO2 Application
Two Stage Compressors For Low Temp Application
Tandem Compressor Models
VS Compressor Models with Built‐In VFD
Transport Compressors
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SEMI HERMETIC COMPRESSORS
RECIPROCATING
Single stage
CO2 subcritical – 80 bar
CO2 transcritical – 155 bar
ECOinside (optimized R134a)
VS (built‐in VSD)
AXH and AXY (ATEX)
Double stage
Tandem
TS (transport)
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New Capacity control
New Capacyti control
New Capacity control
New Capacity control
New Capacity control
New Capacity control
Reciprocating Compressors
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GENERAL CONCEPTS
Systems are designed to satisfy the maximum cooling capacity that could occur, so for most
of the operating time systems are over dimensioned
The capacity could be reduced switching OFF periodically the compressor but there are
limitations: max switch rate: 8‐10/hour – minimum running time 2 – 5 min.
These limitation brings to large temperature deviation in the room
The system has to cool down the room enough to guarantee that during compressor
standstill (6 min – cycle time) the temperature can’t rise over the maximum acceptable
temperature, to do this lower Tevap. is required
Lower evapora ng temperature → lower COP of the compressor
The possibility to regulate capacity permit to keep the compressor in operation for longer
time and to operate at a higher Tevap. .
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Exclusive and innovative Capacity Control
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How standard capacity control works?
Exclusive and innovative Capacity Control
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0% Displacement
100% Displacement
‐ Vacuum effect‐ Unbalancing
STANDARD CC HEAD
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Exclusive and innovative Capacity Control
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compressor ON‐OFF
12 start/hour TOO MANY !!! Out of Compressor limits!
Very short running time
Temperature variation can’t be increased
compressor1 with Capacity Control
10 start/hour OK Less compressor starts
Longer running time
Case 1: Reducing n° of start / hour
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Exclusive and innovative Capacity Control
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Given Tmax and Tmin, with Capacity regulation is
possible to:
increase continuous running time
reduce starts/hour
→ Reduced electrical stress at start‐up
→ Reduced mechanical stress at start‐up
→ Better oil return to the compressor
Secondary effect: at partial load the load on condenser is less
→ With Capacity regulation (and floating condensing temp) is possible to reduce Tcond
Case 1: Reducing n° of start / hour
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Exclusive and innovative Capacity Control
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compressor ON‐OFF
6 start/hour OK Very short running time
Large Temperature variation
Low Tmin → Low Tevap (Tmin ‐14°F)
compressor1 with Capacity Control
6 start/hour OK Longer running time
Smaller temperature variation
Higher Tmin → Higher Tevap
Case 2: improving efficiency
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Exclusive and innovative Capacity Control
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With Capacity regulation is possible to reduce
variation of room temperature.
Given Tmax is possible to increase Tmin Tevap = Tmin – evaporator’s ∆T
→ Regulating capacity is possible to increase Tevap
@‐35°C/45°C: Tevap ↑1.8°C ↔ COP ↑ 4%Tevap ↑3.6°C ↔ COP ↑ 6% Tevap ↑5.4°C ↔ COP ↑ 10%
Secondary effect: at partial load the load on condenser is less
→ With Capacity regulation (and floating condensing temp) is possible to reduce Tcond
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Exclusive and innovative Capacity Control
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LESS compressor On‐Off cycles
FEATURES & PRO’s
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Exclusive and innovative Capacity Control
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Capacity Control Problems
Traditional Capacity Controls operates closing completely the suction flow
to the cylinders under the CC head.
This can cause several problems that can cause serious consequences:
Overheating
• The refrigerant trapped into the cylinders is continuously expanded and compressed increasing gradually its temperature
• No temperature monitoring because these cylinder has no discharge flow
• Over 150‐160 °C POE oil vaporize and parts start wearing; over 170°C POE oil carbonize and create contaminants increasing wearing of parts
• Worn piston and piston rings permit high pressure bypass to the crankcase closing oil check valve and interrupting oil flow back from
the system
High pressure in crankcase
Oil check valve closedNO oil return Blueis better
Exclusive and innovative Capacity Control
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Capacity Control Problems
Vacuum operation
• Every cycle the piston movement create vacuum into the cylinder
but suction reed don’t open (no suction flow)
• Vacuum suck oil from cylinder liners and accumulate it into the
cylinder.
• Oil accumulation can lead to liquid slug and damage or broke the
discharge reed or the valve plate gasket
• Broken parts will end up in compressor malfunctioning
Brokendischargereed
Brokengasket
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Exclusive and innovative Capacity Control
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RSH HEAD
50% Displacement
100% Displacement
‐ Operating Pressure‐ More balanced
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Exclusive and innovative Capacity Control
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LESS compressor On‐Off cycles and BETTER system efficiency
FEATURES & PRO’s
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Very constant evaporatingtemperature (green line)
Exclusive and innovative Capacity Control