Page 32 - Climate Control News magazine March 2022

Compressors, Condensers & Evaporators
Expansion valve for high efficiency
BUILT ON A foundation of precise superheat control, the Danfoss TD1 thermostatic expan- sion valve now features a more sustainable stain- less-steel capillary tube and sensing bulb.
The TD1 delivers up to 15 per cent more energy savings and up to 20 per cent reduction in pull- down time under actual operating conditions compared to capillary tubes.
Known for its high efficiency and quality, the TD1 thermostatic expansion valve is engineered to control liquid injection into small capacity evaporators for commercial refrigeration appli- cations such as glass door merchandisers, com- mercial fridges and freezers, walk-in cold rooms, ice machines, ice cream cabinets, and refrigerat- ed beverage dispensers.
The TD1 range now features a capillary tube and sensing bulb both made of stainless steel – which will be standard across all Danfoss TXVs with UL approval as of March 2022. In addition to being a more sustainable material than cop- per, stainless steel is also more adaptable to var- ying temperatures.
Compared with standard capillary tubes, ther-
mostatic expansion valves have a huge advan- tage: namely, the ability to adapt to varying cool- ing conditions for efficient superheat control.
This allows OEMs to build more energy-effi- cient and reliable solutions that meet A3 refriger- ant regulations and reduce development over- head costs. At the same time, it significantly increases food quality and safety.
“TESTING HAS SHOWN SUBSTANTIAL GAINS WITH THE TD1 OVER A CAPILLARY TUBE.”
With technical support for product selection and unit testing, we’re committed to ensuring a smooth transition to the TD1 thermostatic expansion valve.
Thorough testing performed in the Danfoss ADC (Application Development Centre) has shown substantial gains from choosing the TD1 thermo-
ABOVE: From the Danfoss Td 1 series.
ABOVE LEFT: The valve is engineered for commercial refrigeration applications.
static expansion valve over a capillary tube. Based on GDM and CFF tests under actual op- erating conditions, the TD1 delivers up to 15 per cent energy savings at varying ambient tempera- tures compared to a capillary tube optimised for pull-down conditions or for unit design condi- tions. And the valve reduced pull-down time with up to 20 per cent against a capillary tube
sized for operation at setpoint.
Development benefits include faster time-to-
market with a simpler manufacturing process combined with less time needed for design and testing. Also, A3 compliance enables an easy tran- sition to low-and ultra-low GWP refrigerants.
The stainless-steel design change in the TD1 range reinforces Danfoss’ sustainability focus and its support for the green transition with a broad portfolio of A3-compatible condensing units, compressors, and components.
Hypertwain is suitable for high pressure refrigerants.
Improving evaporator performance
SWEP HAS INTRODUCED the FTW250AS brazed plate heat exchanger (BPHE), the first BPHE based on the company's novel Hypertwain technology.
The FTW250AS BPHE primarily targets re- versible chillers and heat pumps. Unlike a stand- ard BPHE, Hypertwain features an integrated suction gas heat exchanger (iSGHX) that im- proves the evaporator performance.
This feature helps OEMs design and bring products to market with unrivaled seasonal effi- ciency in both heating and cooling mode, as well as reducing the refrigerant charge and footprint.
The integrated iSGHX also enables control
stability compared with an external SGHX. In addition, Hypertwain also improves freeze re- sistance and reduces water pressure drop.
Hypertwain integrates several functions criti- cal for evaporator and condenser duties in chiller and heat pump applications.
The FTW250AS covers a capacity span up to around 70 USRt while the Hypertwain platform is being extended with additional BPHEs aiming for capacities up to 200 USRt with both single and dual circuits.
Focus refrigerants are all high-pressure refrig- erants, such as R32, R410A, R454B, R452B, as well as being verified for R290 (Propane).
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