The global heat pump market is growing rapidly as governments, utilities, manufacturers and end-users seek more sustainable heating and cooling solutions. However, developing a competitive heat pump is becoming increasingly challenging. Manufacturers must simultaneously improve efficiency, reduce refrigerant charge, lower environmental impact, minimise noise, ensure reliability and comply with evolving international regulations. Successfully bringing a new heat pump to market requires much more than selecting the right components. It requires a deep understanding of thermodynamics, heat transfer, refrigerants, compressors, controls and system optimisation. Heat pump manufacturers are therefore increasingly looking for partners who can support not only product development and testing, but also the tools required to perform that work efficiently.
Challenge #1: Increasing Efficiency
For most heat pump manufacturers, efficiency remains the single most important performance metric. A higher COP or SCOP does not simply result in lower energy consumption. It influences product competitiveness, regulatory compliance, energy labels, operating costs and ultimately purchasing decisions. A seemingly small increase in seasonal performance may allow a product to achieve a better energy label, reduce customer operating costs and create a significant competitive advantage. The challenge is that modern heat pumps are already remarkably efficient. The easy gains have largely been achieved. Today's improvements come from optimising the complete system rather than individual components. Compressor performance, heat exchanger design, refrigerant charge, airflow management, control algorithms and frosting behaviour all interact with each other.
This means manufacturers increasingly need a combination of modelling, testing and engineering expertise to identify where additional efficiency improvements can be realised.
How Re/Gent Helps
• Heat pump performance testing
• Component optimisation
• System simulation
• Performance modelling
• Validation testing
• Measurement of temperatures, pressures and power consumption
Challenge #2: Frosting and Defrosting
One of the most overlooked challenges in heat pump development is frost formation. Whenever an outdoor heat exchanger operates below the dew point, moisture from the air starts to condense and eventually freeze onto the coil surface. What begins as a thin frost layer can rapidly grow into a thermal barrier that restricts airflow, reduces heat transfer and lowers system efficiency. To restore performance, the heat pump must periodically enter a defrost cycle. During this period, energy is consumed while temporarily no heat is supplied to the building.
Many manufacturers focus heavily on compressor efficiency while real-world performance is often strongly influenced by the effectiveness of the frosting and defrost strategy.
How Re/Gent Helps
• Frost build-up testing
• Heat exchanger performance evaluation
• Frost modelling
• Defrost strategy development
• Heat exchanger optimisation
Challenge #3: Transition to Natural Refrigerants
The heat pump industry is undergoing one of the largest refrigerant transitions in its history. The increasing focus on sustainability and evolving regulations are accelerating the move towards lower Global Warming Potential (GWP) refrigerants. R290 (propane) has emerged as one of the most promising refrigerants for future heat pump systems because it combines excellent thermodynamic performance with an extremely low environmental impact. However, switching refrigerants is never simply a matter of replacing one fluid with another. Safety, refrigerant charge, system architecture, installation requirements and component selection all need to be reconsidered. Manufacturers that successfully navigate this transition often redesign significant portions of their product platform rather than making incremental modifications.
How Re/Gent Helps
• Safe system design
• Refrigerant leak simulations
• Charge minimisation
• Leakage risk assessment
• Detection and mitigation strategies
Challenge #4: Refrigerant Charge Reduction
Reducing refrigerant charge has become a strategic development priority. Lower refrigerant charges can improve safety, reduce environmental impact and simplify compliance with safety standards. At the same time, reducing charge is not straightforward. Less refrigerant means smaller internal volumes and reduced refrigerant inventory throughout the system. This can influence heat exchanger performance, oil return behaviour, capacity control and operating stability. The challenge for manufacturers is finding the optimum balance between safety, efficiency and cost. Re/Gent has been involved in low-charge refrigeration and heat pump development for many years and has extensive experience in helping manufacturers minimise refrigerant charge without compromising system performance.
How Re/Gent Helps
• Refrigerant charge calculations
• Charge measurements
• PVT-based charge determination
• System optimisation towards ultra-low refrigerant charges
Challenge #5: Compressor Development and Variable-Speed Technology
The compressor remains the heart of every heat pump. Over the last decade the industry has increasingly moved from fixed-speed compressors towards inverter-driven variable-speed technology. These compressors continuously adapt their capacity to the required heating load, improving seasonal efficiency, reducing cycling losses and enhancing user comfort. At the same time, compressor development has become increasingly complex. Small changes in compressor operation can influence refrigerant distribution, system stability, discharge temperatures, acoustics and overall efficiency. What many people outside the industry do not realise is that virtually every major compressor innovation depends on accurate calorimetric testing. Meaningful compressor development is almost impossible without reliable performance measurements.
How Re/Gent Helps
• Compressor testing
• Compressor calorimeter solutions
• Compressor evaluation
• Performance map generation
• Variable-speed compressor optimisation
Challenge #6: Noise Reduction
Noise has become one of the most important non-technical buying criteria for heat pumps. Modern customers expect efficient heating without disturbing neighbours or affecting outdoor living spaces. In many markets, noise requirements are becoming increasingly important and are often supported by legislation or local regulations. Noise perception is also frequently cited as one of the barriers to wider heat pump adoption. Reducing noise is rarely achieved by a single design modification. Acoustic performance is influenced by the interaction between compressors, fans, refrigerant flow, controls and operating conditions. Optimising these interactions while maintaining efficiency is one of the most challenging aspects of modern heat pump development.
How Re/Gent Helps
• Noise measurements
• Vibration measurements
• Operational behaviour analysis
• Component optimisation
• System-level evaluation
At Re/Gent, we combine engineering expertise, independent testing services and the development of specialised test equipment. In addition to supporting manufacturers with product development, optimisation and validation, Re/Gent also designs and supplies advanced testing facilities for heat pumps and their components. Whether you need an independent partner to test your heat pump, a development partner to improve its performance, or a complete test facility for your own R&D laboratory.
