Data sheet

Wieland Coaxial Heat Exchangers

Condenser and Evaporator with optimum counter-flow layout

Wieland coaxial heat exchangers are used as condensers (WKC) or as evaporators (WKE). Depending on the performance they consist of one or more thermal optimized inner tubes and one outer tube. The counter-flow layout ensures an optimum heat exchange.

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Coaxial Condensers WKC

Wieland Coaxial Condensers are normally used in applications which require high water temperatures in conjunction with the use of hot gaseous refrigerant. For a low-noise, non-vibration operation, dents are pressed into the jacket tube.

Coaxial Evaporators WKE

These Coaxial Heat Exchangers are the preferred choice in applications where water needs to be cooled significantly. At the same time they also offer reliable superheating of the suction vapour, which is supported by the counter-flow layout. A low-noise operation is achieved by spacer rings in the jacket tube.

Available Versions - Coaxial Condenser WKC

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Model	Number of inner tubes	Installation dimensions [mm]			Connection dimensions [mm]					Volume [l]		Weight appr. [kg]	Classification PED 2014/68/EU
		Installation dimensions [mm]			Refri- gerant	Coolant				Refri- gerant	Coolant
		A	B	H	d₁*	d₂/d₃	d**	a	h	Refri- gerant	Coolant
WKC 10	1	225	270	135	16	12.7	15.9	190	98	0.6	0.3	3.5	sound engineering practice
WKC 15	1	230	290	235	18	16.0	19.0	190	196	1.0	0.8	7.5	sound engineering practice
WKC 20	1	350	360	220	22	21.7	25.5	300	172	1.8	1.75	10.5	Category 1 Module A
WKC 45	4	520	530	225	35	28.0	31.9	445	152	3.7	2.9	21.0	Category 1 Module A

* Internal soldering ends

** External soldering ends

Condensers WKC

1 Coolant outlet | e.g. heating water
2 Coolant inlet | e.g. heating water
3 Refrigerant outlet
4 Refrigerant inlet

Available Versions - Coaxial Evaporators WKE

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Model	Number of inner tubes	Installation dimensions [mm]			Connection dimensions [mm]					Volume [l]		Weight appr. [kg]	Classification PED 2014/68/EU
		Installation dimensions [mm]			Heating medium	Refrigerant				Heating medium	Refri- gerant
		A	B	H	d₁*	in d₂*	out d₃*	a	h	Heating medium	Refri- gerant
WKE 10	1	330	325	130	16	13	13	290	94	0.8	0.4	4.1	sound engineering practice
WKE 16	2	340	390	190	28	22	22	290	140	1.8	0.9	8.1	sound engineering practice
WKE 24	3	435	465	175	28	18	18	380	122	2.4	1.3	11.1	sound engineering practice
WKE 44	5	605	600	220	35	22	28	530	150	4.9	2.9	24.7	Category 1 Module A

* Internal soldering ends

For WKE 10 the fitting on the refrigerant side can be used as external soldering end d4 with ∅ 16 mm (e.g. for tube ∅ 18 x 1 mm).

Evaporators WKE

1 Refrigerant outlet
2 Refrigerant inlet
3 Heating medium outlet
4 Heating medium inlet

Customized Design

Individual coaxial heat exchangers are available with customized series. Suitable for additional performance range and the use with natural refrigerants and operating pressures higher than 35 bar. An individual design can be fitted to your construction requirements.

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Application

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Advantages

High specific performance through optimized inner tubes
Counter-flow
Frost-proof
Low fouling
Long life
Reversible operation possible

Applications

Heat pumps for hot water
Chillers
Cascade heat exchangers in multistage refrigeration systems
Temperature control units/climate chambers
Air conditioning and heating in marine applications

Operating range

Max. operating pressure:
35 bar (refrigerant side)
15 bar (fluid side)
Max. operating temperature:
- 50°C to + 150°C

Assembly instructions

Coaxial heat exchangers should preferably be operated in counter-flow operation. The inner tubes as well as the jacket tube and brazed T-fittings are made of Cu-DHP.

Condensers WKC are installed so that the liquefied refrigerant is free to drain away to the bottom. The hot gaseous refrigerant enters the jacket space at the top, whereas the cooling medium (e.g. water) enters the inner tube(s). Coaxial condensers are also installed standing on the windings (winding axis horizontal). If an application requires several condensers to be connected in parallel, then the tubing should be designed in such a way that each condenser can be supplied with even pressure on both the refrigerant side and the cooling medium side.

The routing of the hot-gas line should be installed avoiding any vibrations. This is normally achieved by installing vibration dampers (compensators). In order to avoid pulsating noises, we recommend installing a sound muffler between the compressor and the condenser. Please follow the manufacturer`s instructions when installing these components.

The installation of evaporators WKE preferably allows the refrigerant to enter through the bottom connection. If several evaporators of the same size are to be connected in parallel, then it must be ensured that each evaporator is supplied with even pressure both on the refrigerant side and on the heating medium side.

For an approximation of the refrigerant capacity of the overall system following proportions of the refrigerant side volume should be used as an approximation: WKC: 30%, WKE: 40%

Quality Assurance

Responsibility begins with a high standard of quality. As the first company for semi-finished products in Europe, we have been on the path to certified quality management since 1987.
Today, we have DIN EN ISO 9001:2015 certifications for all producing plants, and our testing laboratories in Ulm and Vöhringen are additionally accredited to DIN EN ISO/IEC 17025:2018.

Pressure Equipment Directive

Coaxial heat exchangers correspond with the Pressure Equipment Directive 2014/68/EU. They are normally classified in the categories mentioned in the overview and are manufactured and supplied in accordance with the measures designated for this purpose. Operating conditions which exceed these specifications are subject to special requirements which should be agreed separately for each individual case.