How Heat Recovery Systems Improve the Efficiency of Hot Air Coffee Roasting Machines

A heat recovery system is technology that takes the otherwise wasted heat from the roasting process and turns it into usable thermal energy. It’s especially valuable for roasteries that process dozens or hundreds of kilograms of coffee each day, since the machine generates tons of heat every time a new batch runs. Rather than letting that heat vent out, recovering and reusing it can be a great way, particularly as energy costs continue to rise.

But what happens when you put together a hot air coffee roasting machine that’s known for its energy-efficient design with heat recovery systems? Can this combination double down on roasting efficiency? Let’s take a closer look at how heat recovery systems work and what kind of benefits they can bring to your roasting operation.

 

 

Heat Loss in Hot Air Roasters and How It’s Recoverable

The first source of heat loss in hot air coffee roasting machines comes from the exhaust air. During roasting, hot air flows through the roasting chamber to transfer heat to the coffee beans while carrying away the moisture released during the drying phase. In most conventional systems, this air then simply leaves the machine through the exhaust system and disappears.

Chaff removal is the second source. Beans shed a thin outer layer called coffee chaff, and this residue needs to be removed to avoid blockages or catching fire inside the machine. So the airflow is used to carry the chaff out, which also pulls some hot air out along with it.

Because the air from these processes still carries valuable thermal energy, you can actually recover and reuse some of that heat elsewhere in the roasting process with a heat recovery system.

 

How a Heat Recovery System Works

A heat recovery system works in a continuous loop. Heat that would normally escape gets captured and fed back into the roasting process or reused for other heating applications in the roastery. Here are the steps on how heat recovery works:

1. The Exhaust Passes Through a Heat Exchanger

After leaving the roasting chamber, the exhaust air is channeled through a heat exchanger. The heat exchanger is the brain of a heat recovery system and is usually installed externally and connected to the roasting machine. It works by pulling thermal energy from the exhaust and transferring it to incoming fresh air, without letting the two air streams mix.

This means that only the heat is transferred to the incoming air, while smoke, chaff, moisture, and other by-products remain in the exhaust stream and continue through the exhaust system.

2. Fresh Incoming Air is Preheated

The recovered heat warms the incoming air before it reaches the burner or heating system. Because the air is already partially heated, your machine only needs less energy to bring it to the desired roasting temperature for the next batch.

One thing you should know: A heat recovery system is different from an afterburner, even though they work with exhaust air. An afterburner’s main function is to break down harmful compounds in the exhaust air before it’s released into the atmosphere.

That said, there is one type of afterburner that does include a built-in heat exchanger to recover heat. It’s called a recuperative afterburner. So after oxidizing the harmful compounds, it then captures the thermal energy and uses it to preheat incoming air.

 

The Efficiency Benefits of Heat Recovery in Hot Air Roasters

One of the most noticeable benefits is lower energy consumption, as the burner or other heating systems require less energy to reach the desired roasting temperature. The machine can operate more efficiently and may lower fuel and electricity bills over the long run.

Hot air coffee roasting machines are already praised by many coffee roasters for their shorter warmup time. But you can get better efficiency when combined with a heat recovery system. The preheated air helps the machine reach target temperature even faster, which translates to more batches completed in a working day.

More than operational efficiency, this combination also brings other benefits:

• Fewer carbon emissions by reducing fuel consumption and supporting sustainable-production practices that many customers and communities are looking for these days.
• More reliable roast quality because steady batch-to-batch temperatures help keep your roast profile consistent and repeatable.
• Less strain on the burner because it operates under a lower workload, which can help reduce wear and lower the risk of unexpected breakdowns or costly repairs down the road.

 

 

Berto Essential Air With Heat Recovery Systems

What makes Berto Essential Air stand out doesn’t stop at being the smallest commercial hot air roaster in the world. It also brings a range of features designed to deliver efficient and consistent roasting. This machine is equipped with a heat recovery system that lets you reuse wasted heat to roast batch after batch. It’s also built with BertoLogic™ for exceptional consistency and precision, and 100% convection for even heat with a smokeless system for cleaner results.

Experience maximum efficiency and true precision of a hot air coffee roasting machine with Berto Essential Air. Connect with us today.