MVHR Heat Recovery


Breathing new life into spaces, one whisper of fresh air at a time.


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This innovative technology allows you to recover heat from stale air and use it to warm up fresh air coming into the building.

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What is MVHR?

MVHR stands for Mechanical Ventilation with Heat Recovery. It’s a ventilation system that ensures fresh air supply while recovering heat from the outgoing stale air, promoting energy efficiency and maintaining a comfortable indoor environment.

One of the primary roles of MVHR systems is to contribute to energy efficiency in buildings. By recovering heat from the outgoing air, these systems minimize the need for additional heating, resulting in reduced power consumption. The recovery rate of an MVHR system plays a crucial role in maintaining efficient air changes, ensuring optimal energy efficiency. Investing in an efficient MVHR system can lead to significant energy savings and ultimately create a more sustainable environment.

At the core of this technology lies the heat exchanger, a device that enables the transfer of heat from one air stream to another. As the outgoing air passes through the heat exchanger, the heat is captured and used to warm up the cold incoming air. This process ensures efficient energy recovery and ventilation. In a Passive House, MVHR systems with high heat recovery efficiency are used to maintain high air quality while minimizing energy consumption.

How does MVHR Work?

To understand how MVHR works, we need to examine its key components and mechanisms. The heat exchanger, as mentioned earlier, plays a critical role in heat recovery. Its efficiency directly affects the heat recovery rate of the system, maximizing energy efficiency. Additionally, the specific fan power of the ducting impacts the air changes within the system, optimizing energy consumption. Proper airflow, temperature control, and efficient heat recovery contribute to the overall energy efficiency of an MVHR system.

The heat recovery mechanism in an MVHR system operates through the use of heat exchangers. These devices facilitate the transfer of heat between the outgoing and incoming air streams. As the warm air is expelled, the heat is trapped and transferred to the cold air, raising its temperature. The heat exchanger’s efficiency ensures high heat recovery rates, improving energy efficiency. Achieving efficient heat recovery is essential for maintaining room temperature and indoor climate control.

How does MVHR Work?

Using MVHR systems in buildings offers numerous advantages. Let’s explore two key benefits: enhancing indoor air quality and achieving efficient energy savings.

The Basic Principles Of A Ground Source Heat Pump

MVHR systems play a crucial role in maintaining high indoor air quality. By continuously exchanging stale air with fresh air, these systems remove pollutants, allergens, and excess moisture, creating a healthier living or working environment. Poor indoor air quality can lead to various health issues, including respiratory problems and allergies. With an MVHR system, you can ensure that the air you breathe is clean and free from contaminants, contributing to overall well-being.

Efficient Energy Savings

In addition to better air quality, MVHR systems offer efficient energy savings. By recovering heat from the outgoing air, these systems reduce the need for additional heating, leading to decreased power consumption. Some key considerations for efficient energy savings in MVHR systems include:

  • Energy efficiency relies on specific fan power, optimizing air changes and ventilation.
  • High heat recovery efficiency minimizes power consumption, resulting in energy savings.
  • Using an MVHR system can contribute to reduced energy bills and a more sustainable future.

Key Considerations While Choosing an MVHR System

When choosing an MVHR system, consider the following:

  • The efficiency of heat recovery units, as it directly impacts energy efficiency.
  • Airflow and air temperature requirements for optimal system performance.
  • The capacity and efficiency of heat exchangers, ensuring efficient heat recovery.
  • Ducting insulation and airtightness to maximize heat recovery efficiency.
  • Best practices, such as those used in passive house design, can guide your decision-making process.

Importance of Airtightness

Airtightness is a crucial factor in the efficient operation of MVHR systems. Seamless insulation combined with effective airtightness ensures heat recovery efficiency. Airtight buildings minimize heat loss and maximize energy efficiency. By preventing air leaks, airtightness allows the MVHR system to maintain efficient air changes, creating a comfortable indoor environment while reducing energy consumption.

Types of Ducting Used for MVHR

Now, let’s explore the different types of ducting used in MVHR systems.

Understanding Branch System

The branch system ducting is one commonly used configuration in MVHR systems. It ensures efficient air distribution throughout the building, maintaining room temperature consistently. Some key features of the branch system include high recovery rates, efficient air changes, and optimized specific fan power, providing energy efficiency.

Exploring Radial System

Another option for ducting in MVHR systems is the radial system. In this configuration, ductwork radiates from one central point, ensuring efficient airflow distribution. The radial system promotes high recovery rates, efficient air changes, and high-quality air streams, resulting in energy-efficient ventilation.

When considering an MVHR system, it’s important to evaluate the costs involved.

Installation of an MVHR Unit

Installing an MVHR unit correctly is crucial for optimal performance and energy efficiency.

Where to install an MVHR Unit?

When deciding where to install the MVHR unit, consider the following:

  • Installing the unit in the loft can ensure efficient heat recovery, maximizing energy efficiency.
  • Placing the intake strategically indoors optimizes heat recovery efficiency, ensuring high energy efficiency.
  • Installing the unit on an external wall promotes efficient airflow, further enhancing energy efficiency.

Why Choose Us to be your MVHR Installer?

Expertise & Experience

With over 30 years of combined experience, SL Energy brings a wealth of expertise in heating and plumbing. Trust our seasoned professionals to install your Air Source Heat Pump with precision and care.

Sustainable Solutions

Be a part of the green revolution with our sustainable heating solutions. As leaders in the industry, we prioritise eco-friendly practices, ensuring your home is both comfortable and environmentally conscious.

Certified Installations

Our installations are backed by the Microgeneration Certification Scheme (MCS), assuring you of top-notch quality and compliance with industry standards. Choose us for certified excellence in every installation.

Customer Satisfaction

Join a growing list of satisfied customers who have experienced the SL Energy difference. Read testimonials from real clients who have benefitted from our Air Source Heat Pump installations.

Versatile Solutions

Tailored to your needs, our Air Source Heat Pumps provide versatile heating solutions. Whether it’s underfloor heating, a central heating system, or a customized setup, we’ve got you covered.

Control Technology

Take control of your comfort with our advanced heat pump controls. We utilize modern technology to optimise efficiency and ensure that your heating system is both user-friendly and effective.

Transparent & Honest

At SL Energy, transparency is key. We provide clear communication, honest assessments, and fair pricing. You can trust us to guide you through the installation process with integrity.

Local Service, Global Standards

Based in the New Forest, we proudly serve Southampton, Brockenhurst, Lymington, New Milton, Christchurch, Bournemouth, and surrounding areas. Benefit from our local presence and global standards in every installation.

To conclude, MVHR (Mechanical Ventilation with Heat Recovery) systems play a crucial role in achieving energy efficiency and maintaining indoor air quality.

By recovering and reusing heat from stale air, these systems not only reduce energy consumption but also improve overall comfort. When considering an MVHR system, it is important to evaluate factors such as airtightness and ducting options to ensure optimal performance.

Additionally, proper installation and regular maintenance are key for maximizing the benefits of an MVHR system. With its ability to provide efficient energy savings and enhance indoor air quality, investing in an MVHR system is a wise choice for those looking to increase energy efficiency in their homes or buildings.

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