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  • Isolierschale B3-12-50 aus PUR-Hartschaum für Plattenwärmetauscher
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  • Datenblatt der Isolierung für Plattenwärmetauscher Modell B3-12-50
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Insulation shell B3-12-12 Insulation Insulation shell

Insulation shell B3-12-12 Insulation Insulation shell

€34,00 EUR
€34,00 EUR
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Delivery in 2–4 days

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30-day return policy

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3-year warranty

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Experience since 2013

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Article details on insulation

  • Material thickness: 20mm
  • Material: PUR rigid foam
  • Temperature resistance: up to 250°C
  • Size: L-235mm W-120mm H-75mm
  • Associated plate heat exchanger: B3-12-12

Save money if you order the plate heat exchanger directly. Simply order the heat exchanger.

Shipping Information

Shipping costs

Shipping is free for orders within Germany. For deliveries to other European countries, the shipping fee is €13.99.

Delivery time

The usual shipping time is 2-4 working days. We will endeavor to ship your order as quickly as possible.

Shipping service provider

Delivery is via DHL as standard. If you wish, we can also commission another shipping service provider.

Shipment tracking

After confirming your order, you will receive an email with the shipping information.

Express shipping

We offer express shipping for an additional charge of €16.99. To use this option, please indicate in the shopping cart in the "Special order instructions" field that you would like express shipping. We will then arrange for your order to be shipped as quickly as possible.

Return Information

If you would like to return your order, please contact us using the contact form . All further information will be sent to you.

Billing information

If you require a VAT invoice, please send us a request via our contact form or by email to info@alex-depot.de. Alternatively, you can also indicate this in the shopping cart under "Special Order Instructions" and we will provide you with the invoice immediately.

Guarantee promise

We firmly believe in the quality of our products and want you to be satisfied long-term. That's why we offer a 3-year warranty on all our products from the date of purchase. Within this period, we will, of course, repair any defects due to material or manufacturing faults free of charge.

Operating Instructions and Safety Information

[PDF] alex-depot ⋅ Operating instructions DE

[PDF] alex-depot ⋅ Instruction manual EN

[PDF] alex-depot ⋅ Manual de instrucciones ES

[PDF] alex-depot ⋅ Manuel d'instructions FR

[PDF] alex-depot ⋅ IT manuals

View full details
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layers Number of Plates 12 20 30 40 50 60 20 30 40 50 20 30 40 50
swap_vert max. Power 25 kW 45 kW 65 kW 80 kW 90 kW 130 kW 90 kW 135 kW 180 kW 225 kW 115 kW 175 kW 230 kW 285 kW
view_in_ar Volume 0,22 L 0,36 L 0,54 L 0,72 L 0,90 L 1,08 L 0,80 L 1,20 L 1,60 L 2,00 L 1,00 L 1,50 L 2,00 L 2,50 L
crop Heat Exchange Area 0,114 m² 0,24 m² 0,36 m² 0,48 m² 0,60 m² 0,80 m² 0,46 m² 0,69 m² 0,92 m² 1,15 m² 0,64 m² 0,96 m² 1,28 m² 1,60 m²
water Flow rate max. 4 m³/h max. 4 m³/h max. 4 m³/h max. 4 m³/h max. 4 m³/h max. 4 m³/h max. 4 m³/h max. 4 m³/h max. 4 m³/h max. 4 m³/h max. 12 m³/h max. 12 m³/h max. 12 m³/h max. 12 m³/h
weight Weight 0,80 kg 1,11 kg 1,50 kg 1,85 kg 2,23 kg 2,61 kg 2,57 kg 3,41 kg 4,27 kg 5,10 kg 3,86 kg 4,97 kg 6,20 kg 7,50 kg
straighten Size
(Length x Width x Height)
L:191mm W:073mm H:034mm L:191mm W:073mm H:052mm L:191mm W:073mm H:067mm L:191mm W:073mm H:097mm L:191mm W:073mm H:112mm L:191mm W:073mm H:127mm L:315mm W:073mm H:052mm L:315mm W:073mm H:074mm L:315mm W:073mm H:096mm L:315mm W:073mm H:119mm L:286mm W:116mm H:058mm L:286mm W:116mm H:082mm L:286mm W:116mm H:103mm L:286mm W:116mm H:135mm
conversion_path
Connection
2x ½ & 2x ¾
or 4x ¾ inches 		2x ½ & 2x ¾
or 4x ¾ inches 		2x ½ & 2x ¾
or 4x ¾ inches 		2x ½ & 2x ¾
or 4x ¾ inches 		2x ½ & 2x ¾
or 4x ¾ inches 		2x ½ & 2x ¾
or 4x ¾ inches 		4x 3/4 inches 4x 3/4 inches 4x 3/4 inches 4x 3/4 inches 4x 1 inch 4x 1 inch 4x 1 inch 4x 1 inch
split_scene_left Collection
B3-12 Collection B3-12 Collection B3-12 Collection B3-12 Collection B3-12 Collection B3-12 Collection B3-23 Collection B3-23 Collection B3-23 Collection B3-23 Collection B3-32 Collection B3-32 Collection B3-32 Collection B3-32 Collection
model_number_instruction
Digit Meaning
B3 Copper-brazed plate heat exchanger
12 Heat exchange area per plate = 0.012 m²
Total heat exchange area = 20 plates ⋅ 0.012 m² = 0.24 m²
20 Number of plates

  • Free Shipping

    Your order is free of shipping costs within Germany. We will keep you reliably informed about the current delivery status.

  • Carefree return

    With our extended return policy, you have 30 days to test your order and return it if necessary.

  • 3 year guarantee

    We fully stand behind the quality of our products and therefore offer a 3-year guarantee for your long-term security.

  • professional advice

    We will be happy to advise you during your purchase so that you can find the ideal product that is precisely tailored to your needs.

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Product Information

PUR rigid foam insulation shells for plate heat exchangers – 20 mm insulation with high energy efficiency, easy plug-in assembly, and moisture protection

Optimized efficiency with PUR rigid foam insulation shells

An uninsulated plate heat exchanger continuously releases heat to its surroundings. Our precisely fitting insulation shells made of durable PUR-rigid foam effectively counteract this and provide improved thermal insulation. With a material thickness of 20 mm and a thermal transmittance coefficient of approx. 1.1 W/(m²K), they significantly reduce heat loss. Compared to uninsulated systems, this enables an efficiency increase of over 90%! The insulation shells can be installed quickly and easily thanks to the simple plug-in assembly, and retrofitting is possible at any time. In addition, the closed surface offers protection against moisture, corrosion, or mechanical impact.

Copper-brazed plate heat exchanger – stable connection through copper brazing, high heat transfer, durability, and corrosion resistance

Your benefits with high-quality 99.9% copper soldering

Copper-brazed plate heat exchangers enable efficient heat transfer while maintaining high structural strength. The copper brazing creates a permanently stable bond between the stainless steel plates, which not only enhances thermal efficiency but also contributes to the durability of the heat exchanger. Thanks to the high thermal conductivity of copper, these plate heat exchangers are ideal for demanding applications that require reliable and powerful performance. Combined with plates made of 304 stainless steel, copper-brazed heat exchangers offer good corrosion resistance for a wide range of uses. This makes them a cost-effective solution for various heating, cooling, and industrial applications.

Function and Design of a Brazed Plate Heat Exchanger – Illustration of Efficient Heat Transfer in Counterflow Principle for Heating and Cooling

Design & Function of a Plate Heat Exchanger

Brazed plate heat exchangers consist of multiple stainless steel plates featuring an embossed pattern with oppositely aligned chevron grooves. All plates share the same shape but are alternately rotated by 180 degrees when stacked. This arrangement creates defined flow channels for both media while simultaneously forming contact points between the plates. Using a high-vacuum brazing process, the plates are joined at the contact points with copper brazing material, resulting in a robust and leak-proof connection.

The schematic illustration above shows the flow of the two media inside the plate heat exchanger. The hot medium enters from the right side and flows through every second channel until it reaches the opposite port. In parallel, the cold medium enters through the left port, flows through the alternating channels, and exits on the opposite left side. Although the two media are physically separated by the stainless steel plates, they are in direct thermal contact, enabling highly efficient heat transfer from the warmer to the cooler medium.

For optimal performance, we strongly recommend connecting the plate heat exchanger in a "counterflow" configuration. In this setup, the two media flow in opposite directions past each other, maintaining the highest possible temperature difference across the entire heat transfer surface. In contrast to the "parallel flow" configuration, where both media flow in the same direction, counterflow enables significantly more efficient heat transfer and thus more effective energy exchange. The following graphs illustrate the theoretically achievable outlet temperatures for counterflow and parallel flow configurations.

Parallel flow

Counterflow

*Note: The values shown indicate the theoretically maximum achievable temperatures. They are intended solely to illustrate the operating principle and should therefore be interpreted with caution.
In practice, heat losses, insufficient insulation, fluctuating flow rates, etc. may affect the results. Accessories such as insulation shells can help remedy this and improve efficiency. A detailed practical test can be found in our blog post.
Plate heat exchangers with specially embossed plates – turbulent flow for improved heat transfer, high efficiency, and reduced fouling

Unique flow design for maximum efficiency

Due to the special embossing of the plates, a targeted turbulent flow of the media is generated, which significantly increases the performance of the heat exchanger and improves heat transfer. The resulting vortices enhance heat transfer by reducing heat build-up in the boundary layer on the plate surfaces. Normally, this layer acts as a barrier to heat exchange, but breaking it up significantly improves thermal conduction. Even when temperature differences are small or installation space is limited, the efficiency remains high. At the same time, the turbulence caused by continuous movement and strong wall shear stress ensures that particles do not adhere and deposits such as limescale cannot form.

alex-depot Quality Promise – Tested plate heat exchangers and heating circuit distributors since 2013 with 3-year warranty and 30-day return policy

Our Quality Promise

Since 2013, we have stood for reliable technology and the highest quality standards in the field of plate heat exchangers and underfloor heating distributors. Our products are carefully inspected and impress with durability, efficiency, and precise workmanship. That’s why we offer you a 3-year warranty that underscores our quality promise. In addition, you have 30 days to experience the quality for yourself and return the product if it doesn’t meet your expectations. This way, you buy without risk and with the confidence that you’ve made the right choice.

Plate heat exchangers are used in numerous applications where heat needs to be efficiently transferred from one medium to another. Here is an overview of typical application areas, although many other uses are possible.

  • Underfloor heating
    For hydraulic separation between the primary circuit (e.g., district heating or boiler) and the underfloor heating circuit – often with different system pressures, materials, or control requirements.

  • Solar systems / solar thermal
    Transfers the heat generated in solar collectors to the heating or domestic hot water system – often combined with buffer tanks.

  • Domestic hot water preparation
    For heating drinking water using heating water, either in a flow-through system or via storage tanks with integrated heat exchangers.

  • Refrigeration technology
    Used as evaporators or condensers in refrigeration machines, air conditioning systems, and industrial cooling plants for heat absorption or release.

  • Heat pumps
    Serve as evaporators or condensers to transfer environmental heat (from air, ground, or water) to the heating system.

  • Heating systems
    For separating different heating circuits, for example with varying pressure levels, heat generators, or system requirements.

  • District heating
    Transfers heat from the district heating network to the internal heating or domestic hot water system of the building (often in transfer stations).

  • Air conditioning systems
    Enable heat exchange between cooling units (e.g., chillers) and room air or recirculation systems.

  • Building climate control
    Support thermal distribution in central HVAC systems (heating, ventilation, air conditioning) of large buildings such as offices, hotels, or hospitals.

  • Swimming pool water heating
    Transfers heat from the heating system to the pool water with complete separation of both circuits for material compatibility and operational safety.

  • Industrial heating technology
    In processes where heat must be transferred precisely (e.g., in chemical, pharmaceutical, or food industries).

  • Heat maintenance
    For utilizing available waste heat and maintaining a constant temperature level, e.g., in ventilation systems or production processes.

  • Heat supply networks
    Enable decentralized distribution of centrally generated heat to multiple buildings or consumption units, often with individual transfer stations.

  • Combined heat and power plants (CHP)
    Transfer waste heat generated during electricity production to heating or hot water systems, increasing overall energy efficiency.

  • Cooling circuits
    Remove process heat or machine waste heat via water or glycol circuits, often in production plants or data centers.

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Our latest posts

  • Wärmeaustausch zweier Medien, kalt und warm

    Plate Heat Exchangers in Practical Testing

    Stainless steel plate heat exchangers demonstrate stable performance and energy efficiency under real-world conditions. Improvements can be achieved in various ways.

    Plate Heat Exchangers in Practical Testing

    Stainless steel plate heat exchangers demonstrate stable performance and energy efficiency under real-world conditions. Improvements can be achieved in various ways.

  • Vorteile der Kupferlötverbindung

    Advantages of copper soldering

    Copper-brazed plate heat exchangers are highly efficient, durable, and low-maintenance. Thanks to excellent thermal conductivity, they deliver reliable performance with minimal energy and cost.

    Advantages of copper soldering

    Copper-brazed plate heat exchangers are highly efficient, durable, and low-maintenance. Thanks to excellent thermal conductivity, they deliver reliable performance with minimal energy and cost.

  • Aufbau & Funktionsweise - Plattenwärmetauscher

    Structure & Functionality – Plate Heat Exchangers

    Plate Heat Exchangers – compact, efficient, and versatile. They transfer heat between two fluids without mixing them, making them ideal for heating, cooling, and industrial applications.

    Structure & Functionality – Plate Heat Exchangers

    Plate Heat Exchangers – compact, efficient, and versatile. They transfer heat between two fluids without mixing them, making them ideal for heating, cooling, and industrial applications.

  • Wie Isolierschalen die Effizienz verbessern

    How insulation shells improve efficiency

    PUR rigid foam insulation shells protect plate heat exchangers from heat loss, extend their lifespan, and increase energy efficiency. They are durable, precisely fitted, and easy to install.

    How insulation shells improve efficiency

    PUR rigid foam insulation shells protect plate heat exchangers from heat loss, extend their lifespan, and increase energy efficiency. They are durable, precisely fitted, and easy to install.

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Frequently asked questions

How do I receive an invoice for my order?

If you require an invoice with VAT shown, please send us a request via our contact form or by email to info@alex-depot.de. We will then provide you with the invoice immediately.

How do I claim my warranty and return?

We offer a 3-year warranty on our products, which covers defects in materials and workmanship. In the event of defects within the warranty period, please contact us to discuss the process for a return or exchange. You have 30 days from receipt of your order to make returns. Please contact us to obtain a return authorization and clarify further steps. Make sure the products are in their original packaging.

When will unavailable products be available again?

If a product is currently unavailable, we will do our best to get it back in stock as quickly as possible. Please let us know if you are missing a specific product and we will see if we can get it for you ahead of schedule.

Do you offer customized plate heat exchangers?

Yes, we offer customized plate heat exchangers designed to meet our customers' specific requirements. If you require customized solutions, please contact us with your requirements and we will be happy to help you find the right heat exchanger for your application.

How do you calculate the average temperature difference?

The mean temperature difference of a plate heat exchanger can be calculated by several different methods, depending on the type of heat exchanger and the specific conditions. A common method is the Logarithmic Mean Temperature Difference. Here's how you can calculate it:

Formula for Logarithmic Mean Temperature Difference

LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)

Variables
  • LMTD: logarithmic mean temperature difference
  • ΔT1: temperature difference at one end of the heat exchanger
  • ΔT2: temperature difference at the other end of the heat exchanger
Example
  • Temperature of hot liquid at inlet (Th): 150 °C
  • Temperature of cold liquid at inlet (Tc): 30 °C
  • Temperature of hot liquid at outlet (Th'): 80 °C
  • Temperature of cold liquid at outlet (Tc'): 60 °C
1. Calculation of ΔT1 & ΔT2

ΔT1 = Th - Tc = 150 °C - 30 °C = 120 °C

ΔT2 = Th' - Tc' = 80 °C - 60 °C = 20 °C

2. Calculation of the mean temperature difference

LMTD = (120 °C - 20 °C) / ln(120 °C / 20 °C)

LMTD ≈ 55.8 °C

How is the heat flow calculated?

Q = U * A * LMTD

  • Q: heat flow (W)
  • U: total heat transfer coefficient (W/m²·K)
  • A: heat transfer area (m²)
  • LMTD: logarithmic mean temperature difference (K)

or

Q = ṁ * cp * LMTD

  • Q: heat flow (W)
  • ṁ: mass flow rate (kg/s)
  • cp: specific heat capacity (J/kg·K)
  • LMTD: logarithmic mean temperature difference (K)

How should I connect my heat exchanger?

cocurrent and countercurrent principle

The heat energy that can be transferred in a plate heat exchanger is not only determined by the size of the exchange surface and the heat transfer coefficient (k), but is also significantly influenced by the flow directions of the media involved. If both media flow in the plate heat exchanger in the same direction, this is referred to as the cocurrent principle. If they flow in opposite directions, however, this is the countercurrent principle.

The flow direction has a significant influence on the average temperature difference between the media, which in turn determines the efficiency of heat transfer.

Temperature curve with the direct current principle | Temperature curve with the countercurrent principle

Theoretical consideration of the connection options of a plate heat exchanger:

In this example we assume two media with the same heat capacity and the same mass flow.

  • Medium 1: 80 °C
  • Medium 2: 20 °C

With the cocurrent principle, the maximum temperature that can be reached for both media would be 50 °C, which corresponds to the mixing temperature. With the countercurrent principle, however, medium 2 could reach a temperature of up to 80 °C, while medium 1 can be cooled to 20 °C.

This means that the countercurrent principle allows a larger amount of heat to be transferred using the same exchange surface area.

How do I find the right plate heat exchanger for my application?

Finding the right plate heat exchanger doesn't have to be complicated. If you have any questions or need support, don't hesitate to contact us. We'll be happy to help you choose the right model for your needs.

Are the plate heat exchangers suitable for drinking water?

Our copper-brazed plate heat exchangers are generally suitable for drinking water. However, please note: Particularly soft water (with very low mineral content) or aggressive water (e.g., with very low pH or high oxygen content) can permanently attack the copper brazing.