Heat recovery unit with counterflow enthalpy exchanger and counterflow heat exchanger – comparison of solutions
The growing interest in recuperation means that choosing the right heat and moisture recovery device is crucial for the comfort and efficiency of a building. In this article, we compare how a Heat recovery unit with an enthalpy exchanger and a heat exchanger works – and which solution better meets the specific needs of the investor.
What is an enthalpy Heat recovery unit and how does it work?
An enthalpy heat recovery unit is an air handling unit with an exchanger that recovers not only heat but also moisture from the exhaust air. Thanks to a special membrane, the enthalpy exchanger in the heat recovery unit transfers water vapour to the supply air – without transferring odours or pollutants.
This moisture recovery improves comfort during the heating season when the air in buildings becomes too dry. Enthalpy heat recovery unit help maintain optimal humidity, which reduces the need for additional humidification.
How do counterflow heat exchangers work?
Counterflow exchangers are highly efficient solutions – thanks to the extended contact surface of the air streams, they achieve heat recovery efficiency of over 90%. The streams move in opposite directions, which allows for maximum heat transfer.
Although a counterflow heat exchanger provides effective heat recovery, it does not transfer moisture. In winter, this means that the air in rooms is drier, which can reduce user comfort, especially in modern, airtight buildings.
Comparison of heat recovery units with enthalpy and counterflow exchangers – the most important differences
The comparison between heat recovery units with enthalpy exchangers and counterflow heat exchangers boils down to a balance between comfort and cost. Both types provide high heat recovery, but only heat recovery units with enthalpy exchangers also recover moisture, which improves the microclimate in winter.
Heat exchangers are usually cheaper and easier to maintain, but they can lead to dry air. Enthalpy exchangers provide greater comfort, but come at a slightly higher price and have a more complex design.
The final choice should depend on the users' needs, the characteristics of the building and expectations regarding humidity and energy efficiency.
How to choose a heat recovery unit with a counterflow enthalpy exchanger or a counterflow heat exchanger?
The key factors are the technical conditions of the building – its airtightness, internal humidity level and the climate outside the building. In highly airtight houses and in climates where there is a large difference in temperature and humidity between the indoor and outdoor air, the enthalpy variant is better suited, as it increases comfort by reducing air dryness.
With a limited budget and in climates where temperature and humidity differences are smaller, a unit with a counterflow heat exchanger may be a good choice – it is still very efficient in terms of heat recovery and energy consumption.
Alnor offers a wide range of devices and professional advice, helping you choose the optimal solution for each project.
Installation of Heat recovery units – what you need to know
The installation of Heat recovery units with both enthalpy and heat exchangers requires several key technical aspects to be taken into account. Space is needed for the control unit, supply and exhaust ducts, condensate drain and convenient access to filters and service components. Regardless of the technology chosen, it is crucial that the installation is carried out in accordance with the design and HVAC best practices – only then will the ventilation system operate efficiently and without failure.
Why choose Alnor recuperation systems?
Alnor is a Polish manufacturer with over 30 years of experience in the HVAC industry, offering modern recuperation systems for residential and commercial applications. The offer includes both devices with a counterflow enthalpy exchanger and a counterflow heat exchanger – adapted to various building conditions and user needs.
The company not only ensures high quality workmanship, but also comprehensive support – from technical advice and device selection to servicing. If you are looking for a proven solution and partner in the field of mechanical ventilation, contact Alnor and choose the perfect heat recovery system for your investment.