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VAU Thermotech GmbH & Co. KG
MANUAL Brazed Plate Heat Exchanger

MANUAL Brazed Plate Heat Exchanger

Product catalog summary

Overview and Functionality

VAU Thermotech GmbH's brazed plate heat exchangers are engineered for versatile applications such as heating, district heating, cooling, and industrial processes. Constructed from embossed stainless steel plates brazed with 99.9% copper solder, these units offer optimized flow channels for efficient thermodynamic performance, resulting in compact and cost-effective solutions.

Model Naming and Configuration

Model codes reflect the product line, thermal design type (medium, condenser, evaporator), size, plate count, connector types (male/female thread, solder, flange, control), and connection layout (e.g., all connectors on one side). This systematic naming aids in precise identification and selection.

Quick Reference Tables

Temperature range tables correlate primary and secondary side input/output temperatures with recommended model sizes, facilitating appropriate heat exchanger selection based on operating conditions and thermal efficiency needs.

Technical Data and Dimensions

Specifications cover physical dimensions, weight, plate numbers, and port fittings across models VM 15 to VM 85. Standard connectors are male threaded with flat sealing; flange connectors (DN 50) are available for larger units. Weights vary from approximately 1.1 kg for small models to over 100 kg for the largest.

Thermal Insulation and Accessories

Thermal insulation uses black Expanded Polypropylene (EPP) half-shells with self-fastening for easy installation. Accessories include various connector types (male threaded, soldering, crimp-on) and mounting consoles (floor and wall) with bolts and transport hooks.

Installation and Planning Guidelines

Recommended upright mounting to prevent clogging and ease venting, though position is flexible.
Process media should flow in a cross-counter flow pattern.
Incorporate cut-offs, draining, venting, and dirt traps with 0.9 mm mesh.
Use fast temperature gauges at heat exchanger output for control stability; avoid oversizing regulating valves.
Ensure media compatibility; galvanized pipes are not recommended.
Install with strain-free pipe connections and fixed points.

Permitted Operational Parameters

Operating pressure: 10 to 30 bar (positive pressure only).
Operating temperature: up to 195 °C.
Plate material: Stainless steel 1.4404.
Solder material: 99.9% copper.
Compliance with EU Pressure Equipment Directive 97/23/EG.
Parameters apply under static conditions; avoid dynamic pressure and temperature fluctuations.

Installation Examples and Recommendations

Maintain fresh water output temperature ≤ 60°C to minimize chalking.
Include circulation conduits and size according to combined flow rates.
Flush existing systems before upgrading isolation.
Use corrosion-resistant membrane expansion vessels on boiler side.
Adapt system circuitry to local conditions and consider summer temperatures in district heating.
Employ suitable thermostats, safety temperature limiters, and temperature gauges.

Solar Energy Application

For flat solar collectors, design heat exchangers to handle 500 W per square meter of collector area, targeting 65% efficiency at 800 W/m² global irradiation. Typical operating temperatures are 55/35°C for collectors and 20/50°C for fresh water or 30/50°C for heating buffers. Recommended antifreeze agents include propylene glycol and ethylene glycol mixtures with specified frost protection levels.

Request Form and Contact Information

A request form facilitates specification of company details, technical parameters (efficiency, media, temperatures, pressure loss), and preferred connection types (male thread, solder, crimp). Contact information for VAU Thermotech GmbH & Co. KG in Munich is provided for inquiries and support.

Catalog excerpts

MANUAL Brazed Plate Heat Exchanger VAU Thermotech GmbH & Co. KG, Munich, Tel.: +49 (0)89-451027-26, Fax: +49 (0)89-451027-43, E-Mail: [email protected]

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Functionality and layout Because of the many different types of brazed plate heat exchangers there is a multitude of possible applications in heating and district heating as well as cooling and industrial technology. The fabrication is realized with modern methods. Embossed stainless steel plates are specially brazed with 99.9 % copper solder. The optimized design of the flow channels on the primary and secondary side allow for an ideal thermodynamic layout. The result is efficient and compact devices with an excellent priceperformance-ratio. Model naming Example: V M 30 / 50 G – S Configuration...

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Quick reference tables SYSTEM ISOLATION: boiler / underfloor heating Thermal efficiency kW primary secondary input output input output ° C ° C ° C ° C 90 70 40 50 70 50 35 45 70 50 40 50 60 50 30 45 Type of heat exchanger SOLAR UNIT Glycol 35%: fresh water heating Thermal efficiency kW primary secondary input output input output ° C ° C ° C ° C 70 50 10 60 70 25 10 60 65 40 10 60 Type of heat exchanger VM 15-10 VM 30-20 VM 30-10 SOLAR UNIT Glycol 35%: Swimming Pool Thermal efficiency kW primary secondary input output input output ° C ° C ° C ° C 70 50 20 30 70 25 15 25 65 40 10 20 Type of heat...

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Technical Data Series Size Port Fittings Standard with male thread, flat sealing Type size VM 85, flange connectors DN 50 possible VAU Thermotech GmbH & Co. KG, Munich, Tel.: +49 (0)89-451027-26, Fax: +49 (0)89-451027-43, E-Mail: [email protected]

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Thermal insulation Dimensions Series / Size Plate Count Depth x Width x Height (mm) Thermal insulation made of black EPP (Expanded Polypropylene), version with two robust half-shells with self-fastening connections, easy to fit, seal: geometric, self-fastening. Accessories: connectors and consoles Series / Size VM 15 Male thread soldering conn. Male Threaded Solder (sweat) Crimp (Pex) Male Threaded Solder (sweat) Crimp (Pex) Male Threaded Solder (sweat) Crimp (Pex) Male Threaded Solder (sweat) Crimp (Pex) Male Threaded Solder (sweat) Crimp (Pex) Male Threaded Solder (sweat) Crimp (Pex) Type size...

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Permitted operational parameters perm. positive oper. pressure perm. oper. temperature plate material solder material type tested according to EU pressure equipment directive 97/23/EG The permissible operational parameters apply to static conditions. Dynamic, constantly changing pressure and temperature strains are to be avoided! General installation and planning notes For detailed notes please see the recent installation, operation and maintenance manual. The mounting position is arbitrary, but due to clogging and venting reasons we recommend the upright position. The process media are to be...

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Installation examples Fresh water heating in a buffer loading system with circulation included in the buffer Set fresh water output temperature ≤ 60°C if possible, to reduce the risk of chalking (heating fluid ≤ 70°C) TIC = thermostat TS_ = ‘ON’-gauge TS* = ‘OFF’-gauge Fresh water heating in a buffer loading system with circulation included before the heat exchanger At constant flow-through of the fresh water side the risk of chalking is lower; if necessary include the circulation conduit after the loading pump. Attention: in this case the maximum fresh water volume flow and the circulation volume...

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Installation examples System isolation – under floor heating When upgrading system isolation in “old” systems the under floor circuit and boiler circuit must be flushed. Boiler-side control permits low backflow temperatures; use corrosion-proof membrane expansion vessel. TC = thermostat TS* = temperature gauge System isolation – district heating The specific technical connection conditions of the heat deliverer are to be considered. Because of the often high temperature and pressure strains and the changing mode of operation, the installation, operation and service manual have to be observed...

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Installation examples Solar energy – heating a buffer TC = thermostat TAZ* = safety temperature limiter or gauge The circuitry is to be adapted to the local conditions. Layout data Anti-freeze (propylene glycol) For flat solar collectors the heat exchanger should be designed for an exchange efficiency of 500 W per square meter collector area (opt. efficiency rate of 65% at global irradiation of 800 W/m²) in connection with fresh water or foodstuff Pure fresh water heating 25% frost-safe up to -10°C 38% frost-safe up to -20°C 47% frost-safe up to -30°C Anti-freeze (ethylene glycol) collector temperature:...

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Request form – brazed plate heat exchangers Company: Reference contact: E-Mail: Telephone: Fax: Date of request: Technical data: Efficiency: (for solar plants 0.6 kW/m²) Medium: primary side secondary side Input temperature: Output temp.: Pressure loss: (standard layout for max. pressure loss of 20 kPa) Connection types: Male thread Solder conn. Crimp conn. VAU Thermotech GmbH & Co. KG, Munich, Tel.: +49 (0)89-451027-26, Fax: +49 (0)89-451027-43, E-Mail: [email protected]

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Copper brazed plate heat exchanger - type: Connection male thread G 3A

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Copper brazed plate heat exchanger - type: Connection male thread G 3/4"

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Copper brazed plate heat exchanger - type: Connection male thread G 1

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Copper brazed plate heat exchanger - type: Connection male thread G 1

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Copper brazed plate heat exchanger - type: Connection male thread G 1 V*

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Copper brazed plate heat exchanger - type: Connection male thread G 2" brazing points type plate temperature resistant surrounding temperature testing pressure:

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