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Mitsubishi Electric announced the development of a new plate heat exchanger for heat pump¹ equipment used for heating and cooling, achieving approximately three times the heat transfer performance³ of the company’s conventional models.

New Refrigerant Requirements Present New Engineering Challenges

The transition towards carbon neutrality is driving increasingly stringent requirements for refrigerants. This is accelerating the gradual adoption of solutions using refrigerants with a lower Global Warming Potential (GWP). At the same time, greater emphasis is being placed on safety and on optimizing the refrigerant charge within the system.

This is driving the development of heat exchanger designs capable of delivering high heat transfer performance while reducing the required refrigerant charge.

Further improvements in heat transfer performance are constrained by the limitations of conventional heat exchanger designs. Mitsubishi Electric investigated the use of micro-offset fins⁴ between flat plates to enhance heat transfer. Testing revealed, however, that this configuration resulted in non-uniform distribution of the refrigerant’s gas-liquid two-phase flow across the entire plate surface.

This represented one of the key engineering challenges in developing the new heat exchanger.

How the New Technology Works

To achieve more uniform flow distribution, Mitsubishi Electric developed specially designed distribution channels at the refrigerant inlet and outlet.

These channels enable uniform distribution of the refrigerant’s gas-liquid two-phase flow across the plates. The channel arrangement was optimized using Mitsubishi Electric’s proprietary analytical technology, which simulates the complex flow behaviour of two-phase refrigerants between the fine fins.

As a result, Mitsubishi Electric has achieved industry-leading² heat transfer performance while reducing the required refrigerant charge.

Applications Across a Wide Range of Heat Pump Systems

The newly developed technology has the potential for application across a wide range of systems, including:

• Water-based heating and cooling systems;
• Air-cooled air conditioning systems;
• Heat pump systems for electric vehicles (EV).

Mitsubishi Electric plans to integrate the technology into various products across its portfolio as part of its efforts to reduce environmental impact and support the transition to carbon neutrality.

ClimaCom is the official representative of Mitsubishi Electric HVAC solutions in Bulgaria. For more information about Mitsubishi Electric heating, cooling and ventilation systems, you can contact our team or explore our product portfolio.

Source: Mitsubishi Electric Global

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¹ A heat pump system that transfers heat from the environment, such as air or water, for the purpose of heating or cooling.

² As of September 14, 2026, according to a Mitsubishi Electric study on plate heat exchangers for heat pump equipment.

³ Compared with Mitsubishi Electric’s conventional plate heat exchangers.

⁴ Fine fins arranged in a staggered configuration to promote turbulence and enhance heat transfer.

By ClimaCom – the official representative of Mitsubishi Electric air conditioning and ventilation equipment in Bulgaria

ClimaCom organized an event showcasing Mitsubishi Electric’s innovative HVAC solutions, designed both for large-scale projects and for residential and office air conditioning applications.

💡 Solutions presented:

• R32 VRF systems – high-efficiency systems with an advanced chassis design, offering integrated safety solutions aligned with current regulatory directives.

• HVRF – the world’s first hybrid VRF heat recovery system – a solution that combines the advantages of direct expansion systems with those of water-based systems, while meeting increasingly stringent requirements.

• Air-to-water chillers and heat pumps with high-performance inverter scroll compressors – developed to meet the specific requirements of every application, including industrial processes, IT cooling, and comfort air conditioning.

• Residential and office air conditioning, professional HVAC solutions, Ecodan air-to-water heat pump systems, and Lossnay heat recovery ventilation systems.

🔧 The event also addressed the new requirements and upcoming restrictions, as well as their impact on the sector.

By ClimaCom – the official representative of Mitsubishi Electric air conditioning and ventilation equipment in Bulgaria

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The international non-profit organization CDP has once again awarded Mitsubishi Electric its highest “A List” rating for activities related to both climate change and sustainable water management. Mitsubishi Electric has been named to the A List eight times in both categories since 2016, and it has achieved the highest rating in each category for three consecutive years.

The company is actively working towards carbon neutrality supports the circular economy, and aims to be among the leaders in implementing nature-positive practices.

Mitsubishi Electric’s efforts in the field of climate change focus on promoting decarbonization and reducing energy costs through intelligent energy solutions and digital platforms that optimize energy consumption across industry, buildings, and transportation.

In the area of sustainable water resource management, Mitsubishi Electric’s initiatives are aimed at significantly reducing water consumption, ensuring strict control and reuse of resources, and implementing advanced water purification systems in industrial and public facilities.

For Mitsubishi Electric, inclusion in CDP’s “A List” reflects a long-term strategy where sustainability is fundamental to the company’s business operations.

Source:
ME: Mitsubishi Electric Named to CDP’s Climate and Water “A List” for the 8th Time and 3rd Consecutive Year

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The World’s First Hybrid VRF System

Ten years ago, Mitsubishi Electric changed the course of the HVAC industry by introducing the world’s first City Multi Hybrid VRF (HVRF) system – a true technological revolution.

For the first time in history, the advantages of systems using refrigerant as a heat transfer medium and those using water were combined into one innovative solution, which remains unique on the market to this day.

Separate Refrigerant and Water Circuits – an Intelligent Hybrid Principle

The City Multi Hybrid VRF system made Mitsubishi Electric a pioneer in hybrid VRF technologies. The term “hybrid” describes the integration of two different principles in order to extract their key advantages. In this case, the characteristics of systems using refrigerant and water as heat transfer media are combined, organised into separate circuits.

The result is a significant advantage: The refrigerant does not circulate inside the building, ensuring greater safety, sustainability, and design flexibility.

Energy-Efficient and Adaptive HVRF Systems for Modern Architectural Projects in Bulgaria

HVRF technology is designed with modern buildings in mind—those that require a high standard of comfort and optimal energy efficiency.

It represents a sustainable and future-oriented solution that meets increasing environmental requirements while providing the freedom for modular and flexible design of systems using water circulation as the heat transfer medium.

This makes it possible to build complete heating and cooling installations that integrate renewable energy sources—all within a single, intelligent system.

Contact us and our specialist will personally explain more about HVRF systems.

CONTACT US

LEARN MORE ABOUT HVRF SYSTEMS

Sources:
Mitsubishi Electric Europe B.V.: Jubiläum: Wir feiern 10 Jahre Hybrid VRF-System
Mitsubishi Electric Europe B.V.: Hybrid VRF

Mitsubishi Electric at the “New Building – 80 Seconds” Summit

On June 24–25, 2025, the third construction site summit within the “New Building – 80 Seconds” network took place in Berlin. Following the successful events of the past two years, the organizers chose MaHalla as the venue, bringing together representatives from high-level politics, academia, industry, small and medium enterprises, startups, and energy sector companies.

As a leading partner of the network, Mitsubishi Electric was also present to share insights on the new era of construction. A lecture on “Accelerating the Heat Transition with System Solutions for New and Existing Buildings” was delivered, highlighting the need for faster implementation of energy-efficient technologies in the construction sector, which sparked lively discussions among participants.

Efficiency Through Technology – Smart Solutions for New and Existing Construction

During the first session focused on energy efficiency, emphasis was placed on heat pump technology, which can generate 4 kW of heat from 1 kW of electricity.

While the use of renewable technologies has been standard in new construction for years, heat pumps are proving effective in existing buildings as well. They can replace or supplement building heating systems.

Modern solutions for heating and efficient air conditioning are complemented by cloud management systems such as MELCloud and Iconics Digital Solutions. These systems make energy-saving potential visible and actionable, thereby enhancing overall energy efficiency.

Heat Pumps – Cost-Effective Construction and Synergistic Solutions

The second thematic block addressed economic efficiency. It was emphasized that the transition to lower-emission heating should not be a luxury but affordable and cost-effective.

An example of successful synergy is the external heating center implemented with PreFab TGA GmbH, consisting of cascades of heat pumps in containers outside the building. This plug-and-play system enables a cost-effective shift from decentralized solutions, such as gas central heating, to centralized heating, significantly increasing project profitability and efficiency.

“Heat pumps provide solutions for any building while ensuring high efficiency and realistic project feasibility.”

Source: 

Mitsubishi Electric: Mehr Tempo für die Wärmewende

For another year, we are pleased to support the initiative “Japanese Culture Days in Bulgaria”, organized by the Embassy of Japan. As a long-standing partner and sponsor of the event, we are happy to contribute to promoting Japanese traditions, art, and values among the Bulgarian audience.

The 36th edition of “Japanese Culture Days” runs until November 30, 2025, across seven Bulgarian cities and includes a total of 23 events – exhibitions, screenings, concerts, workshops, and other cultural activities.

Here are some of the cultural events we are proud to support this year:

• 05–06.07 – Sofia, Inter Expo Center – Aniventure Comic Con 2025
• 01–14.09 – Stara Zagora, Art Gallery – Exhibition “Kigo” – Images and Words from Nature
• 09–23.09 – Varna, Art Salon at Radio Varna – Japanese Calligraphy Exhibition “Together”
• 25.09 – Sofia, Aula Magna, Sofia University – Children’s Choir of BNR Concert
• 08.10 – Sofia, Ivan Vazov National Theatre – Taiko Japanese Drums Concert
• 10–13.10 – Sofia, Central Halls – Exhibition and Workshop “Ikebana for Home”
• 14.10 – Sofia, American Center at Sofia City Library – The Diverse Expressions of Haiku
• 16–18.10 – Sofia, Triangle Tower Gallery of Serdica – Lecture and Demonstration “A Breeze from Japan”
• 20–22.10 – Sofia, Aula Magna, Sofia University – Lecture and Performance by Japanese Dance Group “Orientarythm”
• 20–22.10 – Vratsa, Youth Center – Event “Kimono Speaks” and Ikebana Presentation
• 28–30.10 – Haskovo, Atanas Sharenkov City Art Gallery – “Kimono Speaks”
• 04–16.11 – Sofia, Triangle Tower Gallery of Serdica – Kirie Exhibition “Myths and Legends from Around the World”
• 05.11 – Sofia, Square 500 – Traditional Japanese Painting Nihonga
• 10.11 – Sofia, Aula at Sofia University – The Gentle Power of Japan: Vision for Expo ’25 and Beyond – Discussion
• 14–15.11 – Pleven, Katya Popova Hall – Wise Messages of Japanese Culture – Dialogue of Values
• 13–16.11 – Sofia, NATFIZ – Japanese Film Panorama
• 17–20.11 – Sofia, Japanese Cultural Center “Kokoro” – Week of Japanese Aesthetics
• 21–22.11 – Veliko Tarnovo, VTU – Week of Japanese Aesthetics
• 24–30.11 – Sofia, Sofia University – Exhibition, Demonstration, Lecture, and Workshops “Miracle Ikebana”

During the initiative, visitors have the opportunity to immerse themselves in the richness of Japanese culture, explore its art, culture, and philosophy, and experience the spirit of Japan up close.

On February 7, 2025, Mitsubishi Electric was recognized for the seventh time with the highest “A List” distinction from the international nonprofit organization CDP – both for its actions in combating climate change and for its initiatives in water resource conservation.

The company has been part of the “A List” since 2016 and, for the second consecutive year, has received the highest score in both categories. The recognition highlights Mitsubishi Electric’s sustainable business approach, its ambitious environmental goals, and its transparency in disclosing results.

Mitsubishi Electric has already set clear deadlines:

2031 – aims to achieve net zero greenhouse gas (GHG) emissions in its factories and offices
2051 – and also throughout its value chain by the fiscal year ending.

CDP’s “A List” is the global benchmark for corporate sustainability. For Mitsubishi Electric, this recognition is yet another confirmation that the company consistently turns its environmental vision into concrete actions.

The ClimaCom team successfully conducted its annual technical training sessions for installers and service technicians, reaching over 400 participants across the cities of Sofia, Plovdiv, Varna, and Burgas.

During the training, specialists were introduced to the latest updates and best practices for working with Mitsubishi Electric products, ensuring the highest service standards for our customers.

The training covered the full product range in the following categories:

• M Series – residential air conditioners;
• Multi-split systems;
• S Series – for home and office use;
• P Series – professional air conditioning;
• Precision cooling;
• Lossnay ventilation systems;
• Ecodan heat pump systems.

It is essential for all ClimaCom partners to complete these annual technical trainings to gain the necessary knowledge and skills for working with Mitsubishi Electric HVAC systems.

We thank all participants for their dedication and professionalism!

One of the important events in our annual calendar is coming up – the training for installers and service technicians of Mitsubishi Electric HVAC equipment, which will be held in the period 07 – 11 April 2025.

This is an opportunity for our partners to upgrade their knowledge, improve their skills and get acquainted with the latest developments in Mitsubishi Electric technologies. The training aims to implement best practices and reinforce the high standards that we maintain for our customers.

In October, Chillventa 2024 brought together industry experts for a major event focused on innovations and inspiring discussions about the future of the HVAC sector. The event was dynamic, memorable, and highly informative.
It was a pleasure to take part in this engaging event and gain insight into the latest advancements shaping the industry.

Mitsubishi Electric’s Future Technological Solutions:

Natural Refrigerants: Shaping the Future of Climate Systems

The focus was on a variety of high-efficiency solutions utilizing natural refrigerants R290 (propane) and R744 (CO₂), offering an environmentally friendly alternative with broad applications.

High-Efficiency Residential Solutions

The company showcased its innovative air-to-air heat pump systems. Highlighting a major advancement, Mitsubishi Electric introduced a new MSZ series model and a split heat pump using R290 refrigerant, providing exceptional heating performance even at outdoor temperatures as low as -30 °C.

Commercial Building Solutions

For hotels and office buildings, the focus was on powerful, energy-efficient air conditioning and heat pump systems from the Mr. Slim and City Multi series. The company also introduced its new compact single-fan outdoor units from the Mr. Slim series, along with a comprehensive range of solutions for IT cooling, precision climate control, and digital infrastructure.

Intelligent Control Solutions

Mitsubishi Electric unveiled the next generation of its MELCloud cloud management platform, featuring location-based system controls. While MELCloud Home is perfectly suited for residential properties and small commercial spaces, MELCloud Commercial provides an optimal solution for larger buildings, hotels, retail spaces, office complexes, and other extensive facilities.