Determine the capacity of a boiler

In summary, to determine the capacity of a boiler needed to generate steam for heating water, you must first consider the flow rate of the water and the inlet and outlet temperature of the heat exchanger. However, it is also important to factor in the efficiency of the heat exchanger before calculating the amount of steam needed. To estimate the size of the boiler, you can calculate the peak load using the formula Q=m c DeltaT, where m is the flow rate, c is the specific heat ratio, and DeltaT is the temperature difference between the inlet and outlet. From there, you will need to use complex calculations involving forced convection, conduction, and convection to determine the transfer of heat from steam to water, taking into account
  • #1
shakal_4_ever
2
0
i want to know how can i determine the capacity of a boiler needed to generate steam which will be used in order to heat water.

take into consedration that i know the flow rate of the water and the inlet and aoutlet temprature to and from the exchanger.
 
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  • #2
You haven't specified anything about the heat exchanger or its efficiency and you need to factor that in before you can determine how much steam (at what temperature and pressure) you need. Remember that steam inlet temperature to the heat exchanger is vitally important. Do you know why?
 
  • #3
For starters, delta-t times flow rate (in lb/hr) is btu...
 
  • #4
well you got to check the power output you need... the max load that is... then you know the steam to be produced... one way to estimate the size of the boiler...
 
  • #5
i think the peak load needed can be calculated using Q=m c DeltaT, m being flow rate, c specific heat ratio, and DeltaT should be the difference in temperature from inlet to outlet thus telling us how much heat the water absorbed. after this step you would have to do complex forced convection/conduction/and convection to find the transfer of heat from steam to the water. to do this u would need those unknowns: conductivity of the pipe(or material), length, entry temp of steam, velocity of entry of steam. usually one of the last 2 is unknown and u wil use the formula to find it.
 

Related to Determine the capacity of a boiler

1. How do you determine the capacity of a boiler?

To determine the capacity of a boiler, you need to know the heating surface area, steam pressure, and steam temperature. The capacity can be calculated using the following formula: Capacity = (Heating Surface Area x Steam Pressure) / (Factor of Evaporation x Specific Volume of Steam)

2. What is the heating surface area of a boiler?

The heating surface area of a boiler is the total area of the tubes and other heat transfer surfaces within the boiler that are in contact with the hot combustion gases. It is measured in square feet or square meters.

3. What is the factor of evaporation in a boiler?

The factor of evaporation is a measure of the efficiency of a boiler in converting water into steam. It takes into account the enthalpy of the steam and the enthalpy of the feedwater. The factor of evaporation is typically between 1.1 and 1.3.

4. How does steam pressure affect the capacity of a boiler?

The steam pressure directly affects the capacity of a boiler. Higher steam pressure can increase the capacity of a boiler, but it also puts more stress on the boiler's components, so it is important to ensure that the boiler is designed to handle the desired steam pressure.

5. Why is it important to determine the capacity of a boiler?

Determining the capacity of a boiler is important for ensuring that the boiler can meet the demands of the system it is being used in. An undersized boiler will not be able to provide enough steam, while an oversized boiler can lead to energy waste and higher operating costs. It is also important for safety, as exceeding the capacity of a boiler can lead to dangerous conditions such as overpressure or overheating.

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