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ZERN ENGINEERING™
by Blauberg Ventilatoren GmbH
Stäblistraße 6.
81477, Munich, Germany
| 🌫 Combating mold and excess moisture with proper ventilation |
Excess humidity is one of the most common and underestimated problems in buildings. It often starts unnoticed: steamed-up windows, damp corners, or a musty smell. But over time, it leads to:
1. Black mold on walls and ceilings
2. Peeling paint, damaged insulation and furniture
3. Worsening of asthma, allergies, and respiratory symptoms
4. Health risks due to mold spores and mycotoxins
5. Structural degradation and increased renovation costs
📉 Studies show that relative humidity above 60% indoors creates the ideal environment for mold growth and microbial activity.
Why does moisture build up?
In modern, airtight buildings, moisture has nowhere to go.
Activities like cooking, showering, breathing, and even drying clothes indoors generate liters of water vapor every day.
If there’s no proper ventilation – the air becomes stagnant, and humidity accumulates in corners, behind furniture, and in cold zones.
The solution – balanced mechanical ventilation
To control humidity, ventilation must do more than just supply fresh air — it must remove excess moisture continuously, even in winter.
That’s where heat recovery ventilation (HRV/ERV) with a well-designed heat exchanger becomes essential:
✅ Constant airflow — stale, humid air out; fresh, filtered air in
✅ No need to open windows or lose heat
✅ Controlled indoor climate without condensation
✅ Prevention of mold, dampness, and allergens
How ZERN ENGINEERING heat exchangers help?
At ZERN ENGINEERING, we design air-to-air heat exchangers that actively support moisture control in every type of building:
🔷 Sensible plate exchangers
Keep airflows completely separate — ideal for bathrooms, kitchens, and bedrooms where hygiene is key.
They prevent condensation by maintaining proper air exchange without energy waste.
🔷 Rotary heat exchangers
In enthalpy and sorption versions, they recover both heat and moisture — balancing indoor humidity in dry seasons, while still preventing excess buildup.
In condensation versions, they focus purely on heat — useful in damp or high-load environments.
🔷 Enthalpy plate exchangers (membrane-based)
Allow vapor transfer while keeping gases, odors, and microbes separate.
Perfect for residential, educational, and healthcare environments where both comfort and hygiene matter.
✔️ VDI 6022 compliant
Don’t wait for mold to show up
Mold doesn’t need a flood — just still air and hidden humidity.
A proper heat recovery ventilation system with the right heat exchanger ensures:
✅ Clean, dry air
✅ No condensation
✅ Long-term protection for your building and health
📩 Contact ZERN ENGINEERING to select the right heat exchanger to keep humidity under control — all year round.
| 💨 How ventilation improves indoor air quality and health |
Why indoor air quality (IAQ) matters
We spend up to 90% of our lives indoors – in homes, schools, offices, and public buildings.
Yet indoor air is often more polluted than outdoor air due to:
These contaminants can harm both comfort and health – especially for children, the elderly, and people with respiratory conditions.
The health risks of poor ventilation
Insufficient air exchange is linked to:
1. Fatigue, poor sleep, and headaches
2.Worsening of allergies and asthma
3. Higher risk of airborne infections
4. Productivity loss and cognitive decline
5. Sick Building Syndrome (SBS)
According to the World Health Organization, proper mechanical ventilation is one of the most effective ways to ensure clean, safe indoor air in shared spaces.
The solution – heat recovery ventilation
Opening windows can help temporarily – but it’s inconsistent, energy-inefficient, and weather-dependent.
That’s why modern buildings rely on mechanical ventilation units (MVUs) – also known as HRVs or ERVs – to ensure constant, controlled air exchange.
At the heart of every MVU is the heat exchanger
And it’s this component that determines how effectively your system:
– Supplies fresh, filtered outdoor air
– Removes stale, humid, or polluted indoor air
– Prevents cross-contamination between airstreams
– Recovers thermal energy to reduce heating or cooling losses
👉 The quality of the heat exchanger = the quality of the air you breathe.
At ZERN ENGINEERING, we manufacture these core components with a focus on:
Whether it’s a home, school, or hospital – the right heat exchanger makes all the difference in air quality.
One purpose and many technologies
Whether it’s a sensible plate, rotary, or enthalpy heat exchanger – the core function is the same 👉 to provide healthy, continuous, and energy-efficient ventilation.
Each type has its strengths depending on building use, climate, and comfort needs.
But all of them contribute to:
✅ Better breathing
✅ Cleaner indoor environments
✅ Healthier people
✅ Lower carbon emissions
At ZERN ENGINEERING, we offer the full range of technologies to match your application – from compact residential units to large-scale commercial systems.
Every modern building needs fresh air – not just for comfort, but for long-term health.
And a properly selected heat exchanger is the most effective way to deliver it – without energy waste or air mixing.
📞 Contact ZERN ENGINEERING to integrate a smart air recovery solution that supports both health and efficiency.
| Reducing carbon footprint with heat recovery systems |
Cutting greenhouse gases using heat recovery solutions
Not just better air – but a better planet🌍
What Is a Carbon footprint?
Your carbon footprint is the total amount of greenhouse gases – primarily CO₂ – generated by your daily energy use. In buildings, the biggest contributors are:
🔥 Heating systems
❄️ Cooling systems
💨 Ventilation losses
Ventilation is often overlooked – yet exhausting warm or cooled indoor air without recovery leads to significant energy waste, and consequently, higher emissions.
Why does it matter?
Buildings are responsible for nearly 40% of global CO₂ emissions.
Ventilation systems without energy recovery:
In the context of Net Zero targets, ESG commitments, and rising energy prices, energy-efficient ventilation is no longer optional – it’s essential.
What can help?
At ZERN ENGINEERING, we manufacture high-performance air-to-air heat exchangers that:
1. Recover thermal energy from exhaust air
2. Transfer it to fresh incoming air
3. Operate without mixing the air streams
4. Reduce heating and cooling energy demand by up to 40%*
(*depending on climate, system setup, and airflow – see IEA Report)
🔍 But how do we measure this performance?
We use Thermal Efficiency (TE) – the percentage of heat recovered from exhaust air and reused in supply air.
For example:
A TE of 85% means that 85% of the heat that would otherwise be lost is retained and transferred back indoors.
Let’s make it practical:
A domestic ventilation unit with 250 m³/h airflow and a 20 °C temperature difference (e.g. indoors 22 °C, outside 2 °C) using a ZERN plate heat exchanger with 85% TE can recover approximately 1.2 kW of thermal energy.
That’s 1.2 kW your heating system doesn’t need to produce – every hour.
✅ The higher the TE, the greater your savings – in kilowatts and kilograms of CO₂.
Which heat exchanger should you choose?
Let’s look at three proven technologies – and how they help in real-world situations:
🔷 Sensible plate heat exchangers
How they work: Airflows are separated by a series of parallel plates. Heat is transferred from exhaust air to fresh air through the plate surfaces – with no air mixing.
Ideal for: Homes, apartments, hospitals, and hygienic environments where air separation is critical.
Example:
In a small residential HRV unit, a sensible plate exchanger (TE = 85%) handles 200 m³/h airflow.
Result: ~1.0 kW heat recovery, cutting heating demand by 25–30% in winter – and reducing annual emissions by up to 200 kg CO₂ (with gas heating).
🔷 Rotary heat exchangers
How they work: A slowly rotating wheel transfers thermal energy – and, in some versions, moisture – between exhaust and supply air.
ZERN ENGINEERING offers three types:
– Condensation: transfers only sensible heat
– Enthalpy: transfers heat + moisture
– Sorption: enhances latent transfer using a coated hygroscopic surface
Ideal for: Medium and large ventilation systems in commercial or industrial settings.
Example:
A supermarket installs ZERN ENGINEERING rotary exchangers (enthalpy type) for 3 000 m³/h airflow.
Result: Up to 14 kW heat recovery with added humidity transfer – saving thousands of kWh and over 800 kg CO₂ annually (with electric heating).
🔷Enthalpy plate exchangers (membrane-based)
How they work: A special polymer membrane allows heat and water vapor to pass, but blocks gases and microorganisms.
Ideal for: Schools, offices, and residential buildings in humid or cold climates.
Example:
In a kindergarten with 400 m³/h airflow, an enthalpy exchanger maintains comfortable indoor humidity in winter.
Result: Lower heating and humidification needs, better comfort, and hygienic operation compliant with VDI 6022.
Ready to make an impact?
Whether you’re designing systems for residential, commercial, or public spaces – the right heat exchanger helps cut emissions, reduce energy bills, and support environmental goals.
Contact ZERN ENGINEERING to select the right heat exchanger for your project – based on airflow, climate, and sustainability targets📩
