How is the efficiency of a heating furnace determined
Thread Content
I have a question for experts: how is the efficiency of a heating furnace calculated?
It’s a rather general question, so it’s hard to answer. The general formula is: Heat absorbed by the medium being heated / Heat value of the fuel burned
The design calculations are based on those for the upper floor.
It can be divided into positive balance and negative balance, with the latter being more accurate. Positive balance: heat absorbed by the medium/heat released by the fuel. Negative balance: various losses are taken into account; it is a reverse calculation that can be measured
The thermal efficiency of a heating furnace refers to the ratio of the heat effectively absorbed by it to the total heat released by the fuel. Since it is difficult to calculate the effective heat absorption capacity of a heating furnace, in practical calculations, this value is generally obtained by subtracting various heat loss mechanisms from the total heat released, a method known as the reverse balance approach. As can be seen from the calculation method based on the counterbalance principle, the counterbalance thermal efficiency testing method offers high precision; it allows for the separate measurement of various types of heat losses. For each type of heat loss, measures can be taken to reduce that particular form of heat loss, thereby improving the overall thermal efficiency of the heating furnace. Its expression is as follows: Thermal efficiency (η) = %, which includes: surface heat loss q1, flue gas heat loss q2, incomplete combustion of gases loss q3, and incomplete combustion of solids heat loss q4.
Using the counterbalance method is quite simple; I’ve developed a software called “Tubular Furnace Thermal Efficiency Estimator 2008 Version” – give it a try! Download address: http://sinoyy.mysinamail.com/soft/index.htm
Recently I have also been calculating for furnaces [resistance furnaces]. If it’s an electric furnace, the original poster can look for the book “Industrial Electric Furnaces” by Jiang Yaozhong, published in 1993. Methods include: 1. Heat balance method; 2. Empirical calculation methods: (1) Formula-based calculation, (2) Graphical method, (3) Analogical method :handshake
Does anyone have the book \"Industrial Electric Furnaces\" written by Jiang Yaozhong? Could you send me copies of pages 575 to 582? Thank you all. 630732956@qq.com