OVEN HEAT RECOVERY
To recover heat on a bakery oven is both easy and complex.
While the technology is available and tested, we will bring our experience to you for a full solution where the heat is used at its best without impacting your current process.
A heat recovery system can be fitted to existing ovens as well as new ovens. The main difference is how the heat is used.
What to expect from a heat Recovery system
Direct combustion ovens release at least 10% of the heat through the chimneys. This is the result of the stoechiometric combustion of natural gas. In reality, the percentage is higher. As an example, a 1000kW oven can be equipped with 2 heat exhangers of 130kW each. At the end of the day, the global harvested heat will equal 2 MWh in 24 hours. That is a annual saving of 20 000€.
The savings are not only to be found on the energy bill. When a washer equipment is supplied heat from the oven instead of a steam source, the savings are also to be found in indirect areas. Less steam means less stress on the steam boiler, less chemicals, less legal vessel inspections, less need for training the personnel.
Your energy usage will be become even better. Count on us to run a project with no impact on the quality of your bake.
New installation versus existing installation
In some simple terms, a heat recovery system collects the heat from one or many locations (points of collection), and transfers the heat to one or many other locations (points of use).
When defining a heat recovery system, the approach is different when it comes to a new installation in comparison to an existing installation. While the way the heat is collected is very similar in both cases, one of the differences rely on how the heat is used.
On an existing installation, the potential points of use already have a heat source, generally steam, gas or electricity. A standard solution is to adapt these points of use for a dual heat sources. The main advatage of such a system is that there is no change to the actual regulation systems that has many years of feedback.
When it comes to new installations, we can design a system that would fully replace the traditional heat sources. The ‘points of use’ equipement would be designed to get 100% of their heat from the heat recovery system, making such a setup perfectly cost-effective: no boiler, no chemical, no pressurized vessel inspections, no boiler trainings and not all the issues related to condensate return and blocked automatic purgers.
The monday morning syndrom
Where are the savings if the oven needs to be turned on 3h before just to build up heat for other equipment? This scenario, that occurs every time the plant is started up (monday morning usually) can be handled with a storage tank containing heated water. We have experience with designing a tank that would maintain enough energy over a weekend and allow for start up without turning on the oven in advance