Danfoss CTM 6 Data sheet
Data Sheet
CTM High pressure valve
Type CTM 6
Improves COP and lowers swept volume of the MT compressors in CO2 systems with parallel compressors
Danfoss Multi Ejector SolutionTM, consists of a CTM 6 High Pressure valve and an AK-PC 782A controller. This solution makes CO2 refrigeration
systems economically competitive with the HFC systems at all ambient temperatures by improving COP in comparison to standard parallel compressor systems.
CO2 systems with Multi Ejector SolutionTM can
be installed in any climate delivering lower energy consumption than i.e. R404A. It removes the CO2 equator entirely.
CTM 6 HP is designed for CO2 systems with
parallel compression to lift a part of the gas from MT suction and mix it with the gas coming from the gas cooler at medium pressure level.
AI260946128833en-000601
CTM High pressure valve, type CTM 6
Features
First Cost savings
•Lower cost compared to parallel compression transcritical CO2 packs due to lower swept volume of compressors. (i.e. smaller compressors or less number of compressors).
•Reliable and robust design.
•Fully integrated solution not requiring any additional components like check valves or motorized ball valves.
•Fully serviceable - wide range of spare parts and accessories.
•Easily accessible strainer / ƒlter for fast maintenance.
•Brings ƒrst cost savings.
◦High pressure valve becomes redundant
◦Enables 15 - 35 % savings on compressor swept volume, compared to booster systems.
Fast Pay Back – Energy saving
•Improved COP, enhanced operation of parallel compressors and lower swept volume to the MT compressors , resulting in lower energy consumption.
•Savings for end users
•Fast payback – lower energy consumption
◦Less compressors and higher e…ciency on the systems, leads to payback time of less than 2 years on avarage globally.
•The combination of CTM 6 High Pressure and the AK-PC 782A ensure an easy setup and commissioning, robust control of the system that ensures many years of problem free operation.
Functions
The Multi Ejector function
Figure 1: The Multi Ejector function
Danfoss |
1 |
2 |
3 |
4 |
5 |
32F996.12 |
|||||
|
|||||
PH |
|
|
|
PS |
PD |
|
|
|
PL |
||
|
|
|
|
||
| <![if ! IE]> <![endif]>Pressure |
PH |
|
|
|
|
|
|
|
|
||
PD |
|
|
|
|
|
|
PL |
|
|
|
|
|
PS |
|
|
|
|
|
|
|
6 |
|
7 |
1Nozzle
2Throat
3Exit
4Mixing chamber
5Diffuser
6Intake due to pressure differential
7Pressure increase due to reducing flow velocity
An ejector is a device that uses expansion energy to compress another fluid. In this case with the transcritical system there is up to 20% of the compressor work that can theoretically be recovered in the expansion.
In this case with the Multi Ejector system the work is coming from the CO2 leaving the gas cooler. The high pressure CO2(PH) is entering the nozzle where the expansion is taking place. At the exit of the nozzle the speed is very high and as a consequence of that the pressure is low.
This low pressure is used to drag liquid from the MT suction accumulator (PL). From there the two flows are mixed in the mixing chamber where the pressure will be lower than at the drive inlet due to the mixing of vapour from a higher pressure.
After the mixing the flow enters the diffuser where the flow is slowed down. The shape of the diffuser enables the conversion from kinetic energy (velocity) to potential energy (pressure). After the diffuser the flow is returned to the receiver.
© Danfoss | Climate Solutions | 2021.03 |
AI260946128833en-000601 | 2 |
CTM High pressure valve, type CTM 6
Applications
The Multi Ejector is designed to lift a part of the gas from MT suction and mix it with the gas coming from the gas cooler at medium pressure level. Pre-compressed gas is taken from the receiver to parallel compressor which works more e…ciently due to lower pressure lift required.
Figure 2: Application
AKS 11 |
AK-PC 782A |
|
|
AKS 11 |
AK-SM 8XX/ |
|
|
Gas cooler |
AK-SM 720/ |
|
|
Multi Ejector High Pressure |
AKS 21A |
|
MBS 8250 |
|
AKS 11 |
IT |
MT |
FC 103 |
FC 103 |
|
MBS 8250 |
MBS 8250
CCMT Liquid (ICMTS) receiver
AKVH |
|
|
|
AK-CC 550A |
AKS 11 |
AKS 32R |
DGS |
Medium temp. load |
|
|
|
|
AKS 11 |
|
LT |
|
FC 103 |
AKVH |
|
AKS 32R |
AKS 11 |
AK-CC 550A |
|
AKS 11 |
MBS 8250 |
|
Low temp. load
<![endif]>R64-2106_10
<![if ! IE]><![endif]>Danfoss
HP High Pressure (120-140 bar Max working pressure)
HP Receiver Pressure (60-90 bar Max working pressure)
LP Suction Pressure MT (35-55 bar Max working pressure)
LP Suction Pressure LT (25-30 bar Max working pressure)
© Danfoss | Climate Solutions | 2021.03 |
AI260946128833en-000601 | 3 |
CTM High pressure valve, type CTM 6
High pressure lift ejectors design mass flow HP side
Figure 3: High pressure lift ejectors design mass flow HP side
<![endif]>Y
|
|
|
|
|
|
|
|
|
|
X |
Inlet pressure HP side [Bar] |
7000 |
|
|
|
|
|
|
|
|
|
Y |
Mass flow HP side [kg/hr] |
|
|
|
|
|
|
|
|
|
|
||
6000 |
|
|
|
|
|
|
|
|
|
|
|
5000 |
|
|
|
|
|
|
|
|
|
|
|
4000 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
HP 1875 |
|
3000 |
|
|
|
|
|
|
|
|
|
HP 3875 |
|
2000 |
|
|
|
|
|
|
|
|
|
|
|
1000 |
|
|
|
|
|
|
|
|
|
|
|
0 30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
110 |
120 |
130 |
|
|
|
|
|
|
|
X |
|
|
|
Danfoss |
|
|
|
|
|
|
|
|
|
|
32F866.10 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Flow from the high pressure side (motive flow) for fully open ejector block as a function of temperature out of gas cooler.
Media
Technical data
Table 1: Technical data
Refrigerant |
R744 with oil |
Maximum working pressure |
140 bar / 2031 psi |
Max. test pressure |
1.43 x 140 bar / 1.43 x 2031 psi |
Max. OPD |
90 bar / 1305 psi (for single-voltage coil, 50 Hz) |
Min. OPD |
< 0.1 bar / 1.45 psi |
Max. pres. dif. E and C connections |
20 bar / 290 psi |
Media temp. range |
-10 °C – +50 °C / +14 °F – 122 °F |
Ambient temp. range |
-10 °C – +50 °C / +14 °F – 122 °F |
Humidity |
0 − 100% R.H. (0-97% R.H. non-condensation condition if IP level is below IPX5) |
|
|
© Danfoss | Climate Solutions | 2021.03 |
AI260946128833en-000601 | 4 |
Loading...