A run-around coil heat recovery system uses two finned coils connected by a closed glycol loop. A pump circulates the fluid between the exhaust coil, where it picks up heat, and the supply coil, where it releases heat into the incoming air. When to Use a Run-around Coil This design is ideal when the supply […]
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 […]
Heat Pipe and Run-Around Coil Recovery: When Air Streams Must Stay Separate
The Separation Problem Some sites cannot mix supply and exhaust air at all: cleanrooms, hospitals, and hazardous or corrosive environments. Rotary wheels and plate exchangers move energy through a shared surface, so engineers turn to technologies that keep the streams fully isolated. Heat Pipes A heat pipe is a sealed tube filled with a working […]