officine mario dorin s.p.a. - nxthpg€¦ · mauro dallai bruxelles – 29th may 2015 2 test...

Mauro Dallai Bruxelles – 29th May 2015 1

OFFICINE MARIO DORIN S.p.A.

NxtHPG project “CO2 transcritical compressors”

Bruxelles – 29th May 2015

“This project has received funding from the European Union’s Seventh Programme for research, technological development and demonstration under grant agreement No [307169]”.


Test results of experimental campaign in Enea

•  Operating conditions of the compressor in heat pumps are very variable •  They depend largely on:

•  ambient temperature •  water inlet temperature

•  Unlike the refrigeration applications, which work in conditions fairly stable throughout the year, in heat pumps, the evaporation pressure can vary from -20°C up to +15°C

•  This variability leads to severe operating conditions in terms of:

•  high discharge pressure •  high suction pressure •  high discharge temperatures


Case study n°4

Case Fluid Source Tamb(ºC) Sink T(ºC) Application (kW)

1 HC (Propane) Air

-10 to 35

(outdoor air) Water

40 to 50 Heating water production

40 60 Low demand

of Domestic hot water

2 HC (Propane)

Water (brine) -5 to15 Water

40 to 50 Heating water Production

60 60 Low demand

of Domestic hot water

3 HC (Propane)

Water (Neutral

loop)

10 to 15 (Sewage water) or 25 to 30

(Condensation loop)

Water 60 Domestic hot water production 50

4 CO2 Air -10 to 10 (winter)

20 to 35 (summer) (outdoor air)

Water 60 to 80 Domestic hot water production 30

5 CO2 Air -10 to 35 (outdoor air) Water

80 (return water

40)

Heating & domestic hot water production 50

Installed compressor: 2 cylinders model CD1000H


Test results of heat pump at case study 4

Following pages will show:

•  operating conditions of compressor measured in Enea

•  the main issues related to the operation of compressor

•  CD compressors adopted design solutions


Test results Tamb = 7°C; Tin_water = 10÷40°C; Tout-water = 60÷80°C

Tambient=7°C

1

21

41

61

81

101

121

141

161

75 80 85 90 95 100 105 110

p_out_CP [bar]

T_ou

t_CP

[°C]

2014_07_14_Tin9_Tout65_Tcc7_matrix

2014_07_14_Tin9_Tout65_Tcc7_pgc105






2014_07_01_Tin20_Tout60_Tcc7_pgc105


2014_07_04_Tin30_Tout60_Tcc7_pgc82

2014_07_04_Tin30_Tout60_Tcc7_pgc105


2014_07_07_Tin40_Tout60_Tcc7_pgc105


1. High discharge temperature


CD compressors design solutions

1. High discharge temperature

Suction side Ambient air

Discharge side

ü  HP / LP thermal insulation

ü  Lower discharge temperature

ü  Better lubrication

ü  Lower pressure pulsations

è HIGHER RELIABILITY

è HIGHER EFFICIENCY

Separation of suction and discharge side

Iron pistons


Test results Tamb = 12°C; Tin_water = 15÷40°C; Tout_water = 60÷80°C

Tambient=12°C

2,3

22,3

42,3

62,3

82,3

102,3

122,3

142,3

85 90 95 100 105 110

p_out_CP [bar]

T_ou

t_CP

[°C]


2014_07_02_Tin15_Tout60_Tcc12_pgc96

2014_07_02_Tin15_Tout60_Tcc12_pgc86



2014_07_04_Tin30_Tout60_Tcc12_pgc95

2014_07_04_Tin30_Tout60_Tcc12_pgc105


2014_07_07_Tin40_Tout60_Tcc12_pgc105

2. High specific load combined with high termal level



2. High specific load combined with high thermal level

R ef r ige rant RangeNom ina l HP m otor

Δp (des ig n)

B orePiston pin

Pis ton load

Spec ifi c load (pi ston pin )

[ba r] [mm ] [mm ] [k g] [k g/mm2 ]

H 2 3,8 28 59 18 780 2,2

H 5 30 28 72 20 1160 2,4

CD200 3,8 120 28 12 750 5,9

CD400 30 120 42 18 1700 4,5

CO2

H FC



2. High specific load combined with high thermal level

HFC solu)on

CD solu)on

CD solu)on

HFC solu)on

Lubrica)on port



Tambient=15°C

1,2

6,2

11,2

16,2

21,2

26,2

31,2

36,2

41,2

46,2

51,2

20 25 30 35 40 45 50

p_in_CP [bar]

T_in_C

P [°C

]


2014_07_01_Tin20_Tout60_Tcc15_pgc105




2014_07_16_Tin50_Tout60_Tcc15_pgc100

2014_07_16_Tin50_Tout60_Tcc15_pgc105

2014_07_16_Tin55_Tout65_Tcc15_pgc105

3. High diluition of CO2 in the oil




Approx. 9 %




Approx. 14 cst




Ref r ige rant O il type% di lui t ion

(ref r ige rant in the oi l)

Res idu al vi scosi ty

Max m ois ture w ate r content

R 134a POE 32 6% 13 cst 50 ppm

POE 85 10% 9 cst 50 ppm

PAG 68 9% 14 cst 500 ppm

CO2

For this reasons, PAG is the best choise for CO2 heat pump applications


Test datas Tamb = 15°C; Tin_water = 20÷55°C; Tout_water = 60÷65°C

Tambient=15°C

1,2

6,2

11,2

16,2

21,2

26,2

31,2

36,2

41,2

46,2

51,2

20 25 30 35 40 45 50

p_in_CP [bar]

T_in_C

P [°C

]


2014_07_01_Tin20_Tout60_Tcc15_pgc105




2014_07_16_Tin50_Tout60_Tcc15_pgc100

2014_07_16_Tin50_Tout60_Tcc15_pgc105

2014_07_16_Tin55_Tout65_Tcc15_pgc105

4. High suction temp. à critical cooling of the motor



4. High suction temp. à critical cooling of the motor

- 100% mass of refrigerant acrosses the motor -  Inner and outer gas channels -  Oil discharge ducts at cylinder side only - Low oil carry over



Tambient=2°C

10

15

20

25

30

35

40

45

50

80 85 90 95 100 105 110

p_out_CP [bar]

P_in_C

P [bar]

2014_07_10_Tin10_Tout55_Tccm7_matrix








2014_07_16_Tin50_Tout60_Tcc20_pgc105

5. Extreme variability in the operating

conditions



5. Extreme variability in the operating conditions

Thanks to adopted design features, of CD-H compressors have a wide operating envelope. All the operating conditions tested in Enea are well inside the envelope


è  The widest CO2 compressor range available in the market

è  Design pressure: LP side 100 bar, HP side 150 bar

è  Displacements @ 50 Hz from 1.1 m3/h to 30.5 m3/h

è  Heating capacity (Tair=7°C; Tin_w=10°C) from 6 kW to 140 kW

CD-H compressor range

Range Cylinder Displacement @ 50Hz

Heating capacity

[m3/h] [kW]

CD200 2 1,12 ÷ 3,00 6 ÷ 16

CD300 2 4,34 ÷ 11,62 23 ÷ 65

CD400 4 9,48 ÷ 26,57 50 ÷ 140


2015 INCOMING FURTHER RANGE

NEW RANGE CD500

•  6 cylinders compressor •  Displacement from 39,8 to 59,5 m3/h •  Nominal power from 50 to 80 HP •  Heating capacity (Tair=7°C; Tin_w=10°C) up to 250 kW) •  External discharge manifold (oil temperature reduction, compressor efficiency increase) •  Design pressure: 100 bar (LP) e 150 bar (HP) •  Safety valve on both low and high pressure sides


Dorin Software available in our website for easy compressor selection


THANK YOU FOR YOUR KIND ATTENTION

officine mario dorin s.p.a. - nxthpg€¦ · mauro dallai bruxelles – 29th may 2015 2 test...

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