Cast iron boilers that are cross-sectionally cast iron are another type of engine room boiler that is used to heat commercial premises. These boilers do not use pipes, but instead, have cast-iron sections with water and combustion gas corridors. The cast iron parts are screwed together and look like a steam radiator. These parts are connected to each other by fireproof washers. These boilers are used to produce steam or hot water and are available in sizes from , to , BTU.

Ventilation gas savings provide the best heat recovery opportunity. In boiler chimneys, there is a need for heat exchangers to transfer heat from the flue gas to the return water or to feed the boiler or combustion air. They even work well in boilers and operate at relatively low flue gas temperatures. There is a large room to recover some of the flue gas heat, which rises if the flue is not recovered. Saving gas from the chimney usually increases the overall efficiency of the boiler by to percent.

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.

Parallel controls use separate motors to regulate fuel flow and airflow, enabling each motor to be tuned throughout the boiler ignition range. During installation, to points are usually drawn to create a curve of airflow corresponding to the fuel flow. The air-fuel ratio can be varied along the ignition range to prepare the optimal ratio in different ignition conditions. Also with the use of electronic dampers, this method of control is very reproducible.

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.