Oven retrofit doubles productivity, halves losses

With a Heet!Box placed in your commercial convection oven, you can easily emulate open-hearth baking, and improve thermal energy efficiency, trapping heat while the door is opened

Commercial convection ovens are useful for baking foods or heating metals, ceramics, but these applications are very inefficient, due to heat losses from the oven.

State and federal teams now push to upgrade oven energy efficiency; but manufacturers feel upgrading would bust their bottom line.

A simple solution is to lay a stack of spaced steel plates on the top shelf of an oven.

During the preheat, the airflow charges both the stack plates and the oven casing plates with equal heat, enough to bake twice the normal batch.

Also, the faces of the stack plates boost the oven heat transfer rate to thrice that of the normal oven.

Easy fixes can stretch the oven's normal limits, such as the reheat time, bake load, or heat flow.

A best practice is to add more stack plates and decrease the airflow velocity.

Thereafter, the oven bakes with a generous heat and a gentle wind, avoiding parching, blistering or scorching.

The paradigm for "generous heat and gentle wind" comes from the ancient "open-hearth" oven, which resembles a squat igloo made of stone blocks.

The blocks store massive heat, while the low domed ceiling minimizes the airflow velocity.

Over 5,000 years the open-hearth oven is still the icon for fine baking despite its massive size, long preheating time, and high operating costs.

Today, with a Heet!Box placed in your commercial convection oven, you can easily emulate open-hearth baking.

In a continual run of double bakes, the Heet!Box doubles productivity by sharing its stored heat with the normal oven heat.

It also traps its own heat while the door is open.

Another feature allows the heat transfer rate to be three times the normal rate.

Thus, many configurations are possible for improving thermal applications, their energy efficiency and environmental acceptability.

No utility connections, equipment, space or other arrangements are necessary.

Data was taken over for four years in a retail gourmet bagel shop.

(The test bed used was a Blodgett Electric Oven, Model Mark V-111, w/2SP Fan Delay/Pulse options.) Environment Heet!Box emits no toxic gases, fluids or other pollutants.

It provides cheap, fast, clean, reliable energy efficiency for electric convection ovens and other thermal devices, as well as social and economic benefits.

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