Enhanced Surface Evaporator Tubes

Wieland’s Enhanced Surface Evaporator Tube combines advanced nucleate‑boiling technology from the GEWA‑B and GEWA‑PB families to deliver outstanding heat‑transfer performance in shell‑and‑tube heat exchangers. Its engineered boiling surface, and optional dual‑enhanced structure with inner spiral fins, significantly boosts thermal efficiency, enabling more compact designs, lower refrigerant charge, and improved energy performance in flooded and falling‑film evaporators.

Additional information

Material overview

	ASTM-UNS No.	Wieland Designation	⁠EN Designation	EN No.	JIS No.	Data Sheet
	C12200	K21	Cu-DHP	CW024A	-	-
	C70600	L10	CuNi10Fe1Mn	CW352H	-	-

Overview Product Variants Design Software ThermalX Certification Typical Applications

Enhanced surface evaporator tubes – for optimized boiling performance

The functional enhancements of the outer surfaces of GEWA-B, GEWA-PB and TURBO-B/E tubes have been optimized for bulk boiling of refrigerants and similar fluids. Coupled with ideally matched surfaces on the inside of the tubes, optimum heat transfer coefficients can be achieved.

GEWA and TURBO evaporator tubes are available with outer and inner surfaces adapted to the specific needs of the application. Depending on the requirement, the portfolio includes solutions for highest performance and efficiency, weight-optimized drop-in applications, media with high viscosities, high fouling applications and enhanced boiling applications in the process industry.

Key benefits

Optimized heat transfer coefficients
Increased heat transfer on shell and tube side
Superior overall heat transfer performance
More compact heat exchanger designs

Reduced refrigerant charge
Improved life cycle energy efficiency
CAPEX and OPEX savings potential
Minimizing CO₂ emissions during operation

Product variants

GEWA-B – for flooded and falling-film evaporators

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GEWA-B tubes are enhanced nucleate boiling tubes for shell-and-tube heat exchangers. They are optimized for flooded and falling-film evaporators in packaged chillers, both for the air-conditioning and refrigeration industry.

Applications

Flooded evaporators in packaged chillers
Falling-film evaporators in packaged chillers
Air-conditioning industry
Refrigeration industry

Product types

B5 & B6 – for highest performance and efficiency
B4HSL – weight optimized, drop-in applications
BHV – for media with high viscosities
BLF / BPL – for high fouling applications

Benefits

Increased heat transfer on the shell and tube side
Superior overall heat transfer performance
Substantial reduction of heat exchanger size and refrigerant charge
Significant improvement in life cycle energy efficiency

GEWA-PB – for enhanced boiling in the process industry

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The GEWA-PB tube is a dual enhanced tube with a nucleate boiling structure on the shell side and a spiral fin structure on the tube side. It has been specially developed for shell-and-tube heat exchangers for the process industry.

Applications

LNG C3 chillers
Ethylene reboilers and condensers for C2 and C3 fractionation and splitting units
Other C3 refrigeration systems

Product types

Gas cooling in a gas processing unit or a feed gas stream in an LNG plant
Liquid cooling, for example quenchwater as heating source
Condensation of a mixed refrigerant or C2 / C3 overhead stream
Other customized solutions, for example plain inside, upon request

Benefits

Best efficiency in class through optimized heat transfer coefficients and minimizing CO₂ emissions during operations
Highest compactness of heat exchanger design
Maximal savings in CAPEX and OPEX

GEWA-PB tube material

Available carbon steel grades:

CS – ASTM-A 179 / ASME-SA 179
LTCS – ASTM-A 334 Gr. 1 & 6 / ASME-SA 334 Gr. 1 & 6
LTCS 3.5% Ni – ASTM-A 334 Gr. 3 / ASME-SA 334 Gr. 3

TURBO B/E – for evaporator tube applications

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TURBO evaporator tubes are available with outer and inner surfaces adapted for specific application needs.

Product types

B – the original boiling tube
ESP – efficient and lightweight
EHPII – the industry standard boiling tube
EPT – high efficiency in ferrous alloys

Engineering & Quality – ThermalX Design Software

ThermalX

ThermalX is our online platform that provides immediate access to our comprehensive of heat transfer technology know-how.

Certification

GEWA-B fabrication and certification

DIN EN 12452 / EN 10216-2
DIN 17679 and VdTÜV 420 / 5 for use in pressure vessels
ASTM B 359 / ASME SB-359 / ASTM A-498
Certification for use in pressure vessels has been obtained with AD-Merkblatt W0 / TRD 100
Certificates 3.1 / 3.2 according to DIN EN 10204

GEWA-PB codes, quality, testing and certificates

Bare tubes according to ASTM-A 450 / ASME-SA 450 and ASTM-A 1016 / ASME-SA 1016
Finned tubes – NDT
EC testing mandatory
Pressure testing in accordance with ASME BPVC Div. VIII Sect. 1 or related code upon request
Other related codes upon request
Certificates 3.1 / 3.2 according to DIN EN 10204

Typical Applications

Product variant	Applications
GEWA-B	Flooded evaporators in packaged chillers
	Falling-film evaporators in packaged chillers
	Air-conditioning industry
	Refrigeration industry
GEWA-PB	LNG C3 chillers
	Ethylene reboilers and condensers for C2 and C3 fractionation and splitting units
	Other C3 refrigeration systems
	Gas cooling in a gas processing unit or feed gas stream in an LNG plant
	Liquid cooling, e.g. quenchwater as heating source
	Condensation of a mixed refrigerant or C2 / C3 overhead stream
	Other customized solutions, e.g. plain inside, upon request
GEWA-B, GEWA-PB & TURBO-B/E	Bulk boiling of refrigerants and similar fluids