Safety Heat Exchanger WRKS
Hygienic, safe and highly efficient: Wieland WRKS safety heat exchangers ensure maximum performance with reliable media separation and optimized energy efficiency.
Additional information
Overview
Hygienic and compact: Wieland Safety Heat Exchangers are ideal for the direct heating of water for domestic use by condensing the refrigerant within the tank. The double-walled model offers additional safety against contamination and complies with the guidelines for ensuring the quality of drinking water. Standard galvanic tin plating of the outer surface reduces the corrosion risk of galvanized steel pipes connected downstream.
Key benefits at a glance
- Higher performance with the lowest refrigerant and material consumption
- Highest COP values according to DIN EN 16147 by installing the heat exchanger directly in the storage tank
- Absolutely reliable media separation through double tubes
- High resistance against corrosion - Hygienic material copper with antimicrobial properties
- Reduced effort for installation and replacement
Typical applications
- Condensation in domestic hot water heat pumps
- Heat recovery of supermarket refrigeration for drinking water
Operating range
- Max. operating pressure: 35 bar
- Max. operating temperature: + 130°C
Available Versions
Standard Designs
| Type | Max. condensation performance Q [kW)* | Outer surface area [m²] | Finned tube no. | Tube length [mm] | Volume refrigerant side [liters] | di [mm] | Dimensions [mm] | Weight app. [kg] | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dmax | amax | e | G | ||||||||
| WRKS 9** | 3.0 | 0.84 | D-1132.12078-92 | 4,800 | 0.3 | 9.0 | 140 | 350 | 62 | 1/2" | 4.7 |
| WRKS 13** | 5.5 | 1.25 | D-1132.15080-92 | 6,000 | 0.7 | 12.0 | 147 | 410 | 62 | 3/4" | 7.5 |
| WRKS 18 | 7.5 | 1.82 | D-1135.18100-92 | 6,950 | 1.1 | 14.6 | 170 | 440 | 65 | 1" | 10.4 |
| WRKS 23 | 10.0 | 2.32 | D-1135.18100-92 | 8,750 | 1.4 | 14.6 | 170 | 540 | 65 | 1" | 12.9 |
Available from stock. Customized design possible on request.
*Refrigerant R134a and ∆T = 25K (difference between condensation and water temperature)
**Optional suitable for fluid group 1
Customized Design
With customized series Wieland Safety Heat Exchanger flex additional flexible designs are available with suitable connecting parts or different tubes like GEWA-safe plain.
On request brazed UNF-Fittings on both tube ends are possible (5/8“-18 UNF; 7/16“-20 UNF).
Assembly Instructions
As a rule, for the use as condenser / desuperheater the Wieland WRK is placed into the bottom part of the hot water tank. Its position may be horizontal or vertical. To avoid vibration failure, the finned tube heat exchanger should be braced in the tank not only for transportation but also in operation.
The mounting to the storage flange is by means of a hexagon nut and hollow disk (included). The seal is generally placed on the outside, but is also possible on the inside. When fixing the nut, it is necessary to counterhold at the fitting flats. Connected refrigerant pipes should be soldered to the pipe ends and fully absorb vibrations. A muffler should be mounted where the refrigerant vapour enters.
Accessories
Electric insulation
Enameled hot water tanks are usually fitted with magnesium or impressed-current anodes to protect inadequately coated areas of the steel vessel against pitting corrosion. To maintain this protective effect, we recommend the use of insulation sets to ensure electrical separation of the heat exchanger from the storage tank. Retrofitting of hot water storage tanks is possible at any time.
Insulating set F
The insulating set F (for flange mounting) consists of an insulating sleeve and an insulating ring. For an outside seal it is fitted between the heat exchanger and the storage tank flange as shown in the figure. Alternately a sealing from the inside is possible. If the flange is less than 8 mm thick, a distance washer (not supplied with the set) should be positioned between the hollow disk and the hexagon nut. Insulating sets are accessories and are supplied on request, two sets are required per heat exchanger.
| Part no. | Description | Material |
| 1 | Finned tube GEWA-D | Cu-DHP | K21 |
| 2 | Connection | CuZn21Si3P | SW1 |
| 3* | Insulating sleeve | PA |
| 4** | O-ring | EPDM |
| 5* | Insulating ring | POM-CE |
| 6 | Hollow disk | CuZn40Pb2 | Z48 |
| 7 | Hexagon nut | CuZn40Pb2 | Z48 |
* not supplied with the set | max. operating temperature: + 95°C
** max. operating temperature: + 130°C | do not use grease containing mineral oil
Certification
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
Safety heat exchangers correspond with the Pressure Equipment Directive 2014/68/EU. These heat exchangers are leak-tested with an overpressure of 50 bar. On the refrigerant side, they are cleaned in accordance with DIN 8964, dried, filled with nitrogen and sealed with plastic caps.
Our Wholesalers
You can find a list of all our wholesalers for heat exchangers and finned tubes here:
