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The E2V-F series
Giovanni Righetto
January 2017
• The most reliable valve.
• The most precise valve.
• Closed means tightly closed.
• A really bi-directional valve.
• Whatever unipolar or bipolar.
The new E2V-F
The most reliable valve
Reliability from design
Carel ExV-products leading technology is the result of
50 years long experience on HVAC application,
and on today most-advanced development-processes.
ExVs F.E.M. structural analysisExVs C.F.D fluido-dynamic analysis
Reliability from testing
For assuring the most reliable product to the
customer, during its development process, the valve
is being deeply tested in all possible working
conditions.
Reliability from testing
We do that by repeating a valve
opening+closing complete cycle
for 1 million times*:
*this equals to more than 10 years service in a standard application (ref. UL 429)
Opening phase: 480stp + 120 extra stp = 600 stp
Closing phase: 480stp + 120 extra stp = 600 stp
1Million cycles = 1,2 billions steps!
→ One complete cycle: 600+600 = 1200 stp
Reliability from testing
This excercise is performed in three different modes:
• In real refrigerating circuit
• In air
• In climatic-chamber
Reliability from testing
In a real refrigerating circuit the valve is being cycled
for 1 million times in both direct+reverse flow:
Reliability from testing
In air, the valve is being cycled for 1 million times
with no compressor-oil lubrication help:
Reliability from testing
In a climatic-chamber the valve is being cycled for 1
million times by ranging the surrounding temperature
from -40˚up to +158˚F:
The most reliable valve
Customer’s
peace of mind
thermal-
stresses
1’000’000-cycles
in-circuit
1’000’000-cycles
oil-free
1’000’0000-cycles
The most precise valve
E2V-F equal-percentage inherent-flow characteristic:
The most precise valve
Resolution
…it helps getting quickly to a steady regulation point.
As a matter of fact: at whatever valve aperture
degree, any shutter movement produces the most
precise flow variation than the starting flow rate
value.
The most precise valve
With different words: a same shutter movement
produces the same flow variation, at whatever
aperture degree.
The most precise valve
It happens at the very beginning of the stroke:
The most precise valve
..moves the flow by
~30%
Moving the shutter
by 10% of its stroke
10% aperture movement
~30% flow
variation
…and it happens at the stroke-end as well:
The most precise valve
..moves the flow by
~30%
Moving the shutter
by 10% of its stroke
10% aperture movement
~30% flow variation
~46%
The most precise valve
Customer system
higher efficiency
the highest precision at
low flow-rates
the best flow-control at
any condition
the highest precision at
High flow-rates
Closed means tightly closed
Closed means tightly closed
A good seal prevents the refrigerant from migrating into the
evaporator during the compressor off-cycles.
Without a good sealing, liquid refrigerant might reach the
compressor with two main effects:
• Reliability issues: the compressor lifecycle is dramatically
reduced.
• Efficiency loss issues: the compressor power absorption
heavily increases when liquid is present.
Efficiency loss
Reliability
Closed means tightly closed
Efficiency loss
As confirmed by many international researches, the compressor
start-up is a low-efficiency working phase due to liquid presence
in the suction line.
Liquid can be present at the compressor suction due to:
• Shut-off valve leakages (or when this valve is not installed)
during the compressor off-cycles
• Long superheat fluctuations during the compressor starting
phases
Carel E2V unique features: tight seal
Efficiency loss
These start-up losses are influenced (increased) by:
• The duration of the compressor off-cycles
• The quality of the superheat control
Even if this lack of efficiency can not be completely eliminated,
however it can be dramatically mitigated by:
• A tight shut-off in the liquid line
• An efficient refrigerant flow control.
Carel E2V unique features: tight seal
Efficiency loss
From Carel HVAC/R application laboratory experience (where the
effects of those losses have been investigated), a leakage rate
similar to competitor declared figures can bring up to 17÷18%
losses*.
Carel ExV tight sealing + equal-percentile flow control can
contain these losses at a maximum value of 6÷7%*.
(*) Depending on the load factor: those indicated are the 50% load factor referred values
Carel E2V unique features: tight seal
Efficiency loss
A really bi-directional valve
The E2V-F performance main data:
• Equal-percentage flow characteristic
• Maximum Working Pressure (MWP) = 652PSIg
• Max. Operating Press. Differential (MOPD) = 508PSI
• Maximum refrigerant temperature = 158˚F
• …
A really bi-directional valve
Are guaranteed on both the two flow directions!
The E2V-F complete bi-directional flow capability
permits to install just one valve on heat-pumps, by
feeding the valve from the side- or from the axle-
one, depending on the working mode:
A really bi-directional valve
The E2V-F complete bi-directional flow capability
also provides the maximum installation freedom,
truly accommodating the designer needs.
A really bi-directional valve
Whatever unipolar or bipolar
Low capacity EEVs on the market are just unipolar.
Unipolar valves are very versatile, but on some
applications just the bipolar drive satisfies the
design requirements (e.g.: when a twin bipolar
driver is shared with a larger size valve on the same
unit).
Whatever unipolar or bipolar
The E2V-F can be both unipolar and bipolar as
needed by the specific application, just by adopting
the relevant stator:
Whatever unipolar or bipolar
Bipolar E2V-F ← → Unipolar E2V-F
With a unipolar statorWith a bipolar stator
The Manual Tool
The ExV manual tool
A very simple tool allows to manually
drive the Carel E2V-F.
As simple as a turning the tap…
The E2V-F series

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The E2V-F series

  • 1. The E2V-F series Giovanni Righetto January 2017
  • 2. • The most reliable valve. • The most precise valve. • Closed means tightly closed. • A really bi-directional valve. • Whatever unipolar or bipolar. The new E2V-F
  • 4. Reliability from design Carel ExV-products leading technology is the result of 50 years long experience on HVAC application, and on today most-advanced development-processes. ExVs F.E.M. structural analysisExVs C.F.D fluido-dynamic analysis
  • 5. Reliability from testing For assuring the most reliable product to the customer, during its development process, the valve is being deeply tested in all possible working conditions.
  • 6. Reliability from testing We do that by repeating a valve opening+closing complete cycle for 1 million times*: *this equals to more than 10 years service in a standard application (ref. UL 429) Opening phase: 480stp + 120 extra stp = 600 stp Closing phase: 480stp + 120 extra stp = 600 stp 1Million cycles = 1,2 billions steps! → One complete cycle: 600+600 = 1200 stp
  • 7. Reliability from testing This excercise is performed in three different modes: • In real refrigerating circuit • In air • In climatic-chamber
  • 8. Reliability from testing In a real refrigerating circuit the valve is being cycled for 1 million times in both direct+reverse flow:
  • 9. Reliability from testing In air, the valve is being cycled for 1 million times with no compressor-oil lubrication help:
  • 10. Reliability from testing In a climatic-chamber the valve is being cycled for 1 million times by ranging the surrounding temperature from -40˚up to +158˚F:
  • 11. The most reliable valve Customer’s peace of mind thermal- stresses 1’000’000-cycles in-circuit 1’000’000-cycles oil-free 1’000’0000-cycles
  • 13. E2V-F equal-percentage inherent-flow characteristic: The most precise valve Resolution …it helps getting quickly to a steady regulation point.
  • 14. As a matter of fact: at whatever valve aperture degree, any shutter movement produces the most precise flow variation than the starting flow rate value. The most precise valve
  • 15. With different words: a same shutter movement produces the same flow variation, at whatever aperture degree. The most precise valve
  • 16. It happens at the very beginning of the stroke: The most precise valve ..moves the flow by ~30% Moving the shutter by 10% of its stroke 10% aperture movement ~30% flow variation
  • 17. …and it happens at the stroke-end as well: The most precise valve ..moves the flow by ~30% Moving the shutter by 10% of its stroke 10% aperture movement ~30% flow variation ~46%
  • 18. The most precise valve Customer system higher efficiency the highest precision at low flow-rates the best flow-control at any condition the highest precision at High flow-rates
  • 20. Closed means tightly closed A good seal prevents the refrigerant from migrating into the evaporator during the compressor off-cycles. Without a good sealing, liquid refrigerant might reach the compressor with two main effects: • Reliability issues: the compressor lifecycle is dramatically reduced. • Efficiency loss issues: the compressor power absorption heavily increases when liquid is present. Efficiency loss Reliability
  • 21. Closed means tightly closed Efficiency loss As confirmed by many international researches, the compressor start-up is a low-efficiency working phase due to liquid presence in the suction line. Liquid can be present at the compressor suction due to: • Shut-off valve leakages (or when this valve is not installed) during the compressor off-cycles • Long superheat fluctuations during the compressor starting phases
  • 22. Carel E2V unique features: tight seal Efficiency loss These start-up losses are influenced (increased) by: • The duration of the compressor off-cycles • The quality of the superheat control Even if this lack of efficiency can not be completely eliminated, however it can be dramatically mitigated by: • A tight shut-off in the liquid line • An efficient refrigerant flow control.
  • 23. Carel E2V unique features: tight seal Efficiency loss From Carel HVAC/R application laboratory experience (where the effects of those losses have been investigated), a leakage rate similar to competitor declared figures can bring up to 17÷18% losses*. Carel ExV tight sealing + equal-percentile flow control can contain these losses at a maximum value of 6÷7%*. (*) Depending on the load factor: those indicated are the 50% load factor referred values
  • 24. Carel E2V unique features: tight seal Efficiency loss
  • 26. The E2V-F performance main data: • Equal-percentage flow characteristic • Maximum Working Pressure (MWP) = 652PSIg • Max. Operating Press. Differential (MOPD) = 508PSI • Maximum refrigerant temperature = 158˚F • … A really bi-directional valve Are guaranteed on both the two flow directions!
  • 27. The E2V-F complete bi-directional flow capability permits to install just one valve on heat-pumps, by feeding the valve from the side- or from the axle- one, depending on the working mode: A really bi-directional valve
  • 28. The E2V-F complete bi-directional flow capability also provides the maximum installation freedom, truly accommodating the designer needs. A really bi-directional valve
  • 30. Low capacity EEVs on the market are just unipolar. Unipolar valves are very versatile, but on some applications just the bipolar drive satisfies the design requirements (e.g.: when a twin bipolar driver is shared with a larger size valve on the same unit). Whatever unipolar or bipolar
  • 31. The E2V-F can be both unipolar and bipolar as needed by the specific application, just by adopting the relevant stator: Whatever unipolar or bipolar Bipolar E2V-F ← → Unipolar E2V-F With a unipolar statorWith a bipolar stator
  • 33. The ExV manual tool A very simple tool allows to manually drive the Carel E2V-F. As simple as a turning the tap…