Steel boilers, as their name implies, are made of steel and are usually made of horizontal cylinders. Steel boilers have a combustion chamber in which pipes are placed around this chamber. The pipes that are installed around the combustion chamber of steel boilers are made of a special alloy so that they do not burn or damage in the face of a direct flame. These pipes are called (fire pipes). Steel boilers are divided into friends from the point of view of heat transfer, which are as follows.

As mentioned earlier, any type of waste, such as soot or sediment, that covers the boiler heat transfer surface will reduce efficiency and increase the likelihood of parts and equipment failure. Cleaning of this surface is necessary according to the manufacturer&#;s recommendations for the life of the equipment and to maintain the optimal performance of the boiler. The waste that covers the boiler pipes prevents heat transfer and raises the temperature of the aerator gas. If incomplete combustion occurs, the resulting soot will accumulate in the part of the pipe where combustion has taken place. Similarly, inadequate water treatment in the water sections of the pipes causes sediment to accumulate in these sections. Only a .-inch-thick layer of soot or sediment can reduce heat transfer by up to . percent, and a .-inch-thick layer by percent.

In commercial complexes, natural gas is mostly used as fuel for engine room boilers because it is usually easily accessible, clean, and more economical than diesel and electricity. Some engine boilers are designed to use more than one type of fuel (usually natural gas and diesel). Dual-burner boilers provide extra gas for fuel outages. It also allows the consumer to use petroleum fuel (diesel) when the amount of natural gas reaches a peak. When the amount of natural gas is higher than other fuels, it is possible to save on fuel costs by using cheaper fuel and limiting the use of natural gas.

If a building has multiple boilers, you may be able to use the boilers in sequence to prevent repeated cycles. If you use boilers that do not adjust, it is better to use the next boiler when the capacity of one boiler is full, instead of disconnecting and connecting several boilers that are loaded. On the other hand, in regulating boilers, the efficiency of the boiler increases in the load-sharing situation. Therefore, using several boilers at the same time in load sharing mode is more beneficial than using one boiler with % efficiency. Figure shows the relationship between ignition rate and efficiency in boilers with adjustable air and fuel flow utilization.

Engine room boilers are high-pressure tanks designed to heat water or generate steam that can be used to heat the environment or to heat the building consuming hot water. In the heating of most commercial complexes, the source of heat for the engine room boiler are burners that work by burning natural gas. Diesel burners or fuel oil (rarely) can also be used. In some heating installations, the use of steam is preferred. Such as: absorption cooling systems, kitchens, laundries, disinfectants and steam-powered equipment.