Member news : Danfoss launches thermostatic expansion valve for CO2

Danfoss has recently launched its first thermostatic expansion valve for CO₂. 

 

A thermostatic expansion valve is a valve thatautomatically regulates the flow of liquid refrigerant to the evaporator to maintain within close preset limits the degree of superheat of the suction vapour (see the dictionary).

 

CO₂ as a refrigerant (R744) has specific characteristics, such as higher pressure levels than for conventional refrigerants or the fact that the liquid line is cold (between 0 and –10°C on average). On conventional systems, the liquid lines are usually at a condensing pressure above ambient temperature. This means that CO2 systems have a heat input in the liquid line, while other refrigerants would have a heat loss in the same case. In this case it allows additional subcooling, while in a CO₂ system it causes a flash gas which reduces the capacity of the expander. 
 
Danfoss has created a thermostatic expansion valve that meets the specifics of CO₂. It is based on its TE2 valve, well-known for delivering accurate and reliable superheat control, easy installation, and good temperature transfer due to their interchangeable orifice assembly and stainless-steel bulb.  

 

Now qualified for R744, the TE2 is suitable for small to medium size remote refrigeration systems such as cold rooms and display cabinets as used in convenience stores, restaurants, and small supermarkets. 

 

More information: https://www.danfoss.com/en/about-danfoss/news/dcs/new-thermostatic-expansion-valve-for-co-refrigeration-systems

 

Other sources:

 

https://www.danfoss.com/en/service-and-support/case-stories/dcs/how-to-select-expansion-valves-for-co-systems/