For years “Made in China” meant low-cost copies. In heat exchangers that story is ending. Industry reports put Chinese applicants at roughly 38–41% of global heat-exchanger patent filings in 2025 — behind only the combined EU/US lead on fundamental heat-transfer theory, but ahead on volume. Where the patents are going Microchannel aluminium cores for EV […]
Tunnel Ventilation Heat Recovery
Tunnels and underground spaces move enormous volumes of air, and the ventilation fans are among the largest energy consumers on the whole facility. Jet fans push air along the tunnel, supply and exhaust fans replace it, and in a cold-climate region the incoming air is heated before it enters so it does not freeze the […]
Wastewater Plant Heat Recovery
A wastewater treatment plant is a surprising place to find a heat-recovery opportunity, but it is one of the best. Digester gas burns to keep anaerobic digesters at temperature, warm sludge flows through the process at 30 to 35 degrees C, and the administration block, lab and control buildings all need ventilation make-up air that […]
Generator and Engine Exhaust Heat Recovery with Air-to-Air Cores
Standby diesel and gas generators, and indeed any continuous industrial engine, convert only part of their fuel into electricity or shaft work; a large share leaves as hot exhaust, often 400 to 600 degrees C, and as jacket and coolant heat. For a generator set running even a few thousand hours a year, that exhaust […]
Estimating Heat Recovery Payback: A Practical Calculator Walkthrough
Before spending capital on an air-to-air heat recovery system, any serious buyer asks the same question: how long until it pays for itself? The answer is not a mystery and it does not need specialist software, a spreadsheet and a clear method give a defensible simple-payback number that survives scrutiny from finance and from the […]
EC Fans + Heat Recovery: Cutting Both Fan Power and Heating Load
When engineers chase energy savings in a ventilation system, they usually think about the heat exchanger first and the fan second. That is backwards for part of the problem. A recovery core hands back the thermal energy in the exhaust, but the fan that pushes air through that core also consumes a large and often […]
Bakery & Oven Exhaust Heat Recovery: Taming Grease-Laden Hot Air
Walk into any commercial bakery and you feel it immediately: a wall of hot, greasy air pouring from the oven and proofer exhaust hoods, while the make-up air system fights to replace it with conditioned air pulled in from outside. That exhaust can leave at 150 to 250 degrees C carrying vaporised fat and flour […]
Integrating Air-to-Air Heat Recovery into Air Handling Units (AHU)
An air handling unit is where air-to-air heat recovery earns its keep in commercial buildings: the AHU already moves the supply and return air, so dropping a recovery core into the airstream is the lowest-cost way to reclaim energy at scale. But integration is not simply placing a wheel into the casing, where the core […]
Enthalpy vs Sensible Wheel: Moisture Transfer
A rotary energy wheel is one of the most effective air-to-air recovery devices available, routinely reaching 70 to 85 percent total effectiveness, but not every application wants what the wheel is selling. The deciding factor is the matrix coating: a plain aluminium wheel moves only sensible temperature energy, while a desiccant-coated enthalpy wheel also transfers […]
Run-Around Coil Systems: Design Rules for Separate Airstreams
When the supply and exhaust ducts are in different parts of a building, or when you need absolute stream separation with no rotating parts, the run-around or coupled coil loop is often the only sensible recovery option. It uses two hydronic coils, one in the exhaust and one in the supply, joined by a pumped […]