END USERS: LARGE MAJORITY ALREADY HAS TRANSCRITICAL CO2 INSTALLATIONS The large majority of the end users surveyed have transcritical CO2 installations (three quarters) already, while the remaining quarter do not have any. Those who do not have any were later asked which factors would influence their purchasing decision. (Read more in Chapter 7, Drivers and barriers).
24%
MANUFACTURERS AND CONTRACTORS: PARALLEL COMPRESSION MOST POPULAR EQUIPMENT Manufacturers and contractors working with transcritical CO2 were asked which equipment they currently work with. Respondents had the option of choosing adiabatic cooling, sub-coolers, parallel compression, ejectors, none of these, or other.
Yes
70%
70 60
Multiple answers were possible. There were 325 answers in total, with 70% of respondents choosing parallel compression, 51% adiabatic cooling, 50% subcoolers, and 44% ejectors. Only 7% do not work with any of these technologies. This shows that parallel compression and related technologies are indeed very popular for increasing the energy efficiency of CO2 systems. Some of these technologies are not only for transcritical/direct systems, but also for subcritical/indirect systems, like for example CO2/NH3 cascades; as indicated by some survey respondents.
76%
80
Survey participants also mentioned various other options (15%) for improving efficiencies of transcritical CO2 systems. These include: booster systems, liquid injectors, and improved controls.
50
51% 50%
44%
40 30 20
15% 7%
10 0 Adiabic cooling
Ejectors
Sub-coolers
None of the above-listed
Parallel compression
Other
Number of responses: 325 [multiple answers possible]
No
Number of respondents: 29
Transcritical CO2 today
29