The Condensate Flow Rate Calculator is a tool used in steam systems to determine the flow rate of condensate. In steam-based heating or process systems, steam transfers heat to equipment or processes, and as it cools, it condenses into liquid (condensate). Understanding the flow rate of this condensate is crucial for optimizing system performance, ensuring energy efficiency, and managing equipment sizing.
By using this calculator, engineers and operators can quickly assess the condensate flow rate, helping to identify inefficiencies, reduce energy consumption, and prevent potential operational issues.
Formula of Condensate Flow Rate Calculator
The condensate flow rate in steam systems can be calculated using the following formula:
ṁ = Q / (h₁ - h₂)
Where:
- ṁ = Condensate flow rate (kg/s or lb/hr)
- Q = Heat transfer rate (kW or BTU/hr)
- h₁ = Specific enthalpy of steam (kJ/kg or BTU/lb)
- h₂ = Specific enthalpy of condensate (kJ/kg or BTU/lb)
Steps to Calculate
- Determine Heat Transfer Rate (Q):
This is the total heat being transferred by the steam in the system. It is typically provided in kilowatts (kW) or BTU per hour (BTU/hr). - Identify Specific Enthalpy of Steam (h₁):
This is the energy content of steam at its pressure and temperature. Values can be obtained from steam tables. - Identify Specific Enthalpy of Condensate (h₂):
This is the energy content of the liquid condensate, which also depends on its pressure and temperature. Values can be found in steam tables. - Apply the Formula:
Substitute the values into the formula to calculate the condensate flow rate.
Reference Table for Common Steam Properties
| Steam Pressure (bar) | h₁ (kJ/kg) | h₂ (kJ/kg) | Heat Difference (kJ/kg) |
|---|---|---|---|
| 1 | 2676 | 419 | 2257 |
| 5 | 2745 | 640 | 2105 |
| 10 | 2782 | 763 | 2019 |
This table provides a quick reference for typical enthalpy values at common steam pressures.
Example of Condensate Flow Rate Calculator
Problem:
A steam system transfers heat at a rate of 50 kW. The specific enthalpy of steam (h₁) at the system's pressure is 2,745 kJ/kg, and the specific enthalpy of condensate (h₂) is 640 kJ/kg. Calculate the condensate flow rate.
Solution:
Use the formula:
ṁ = Q / (h₁ - h₂)
Substitute the values:
ṁ = 50 / (2745 - 640)
ṁ = 50 / 2105 = 0.0237 kg/s
Convert to kg/hr:
ṁ = 0.0237 × 3600 = 85.32 kg/hr
The condensate flow rate is approximately 85.32 kg/hr.
Most Common FAQs
The condensate flow rate helps optimize steam system efficiency, ensure proper equipment sizing, and reduce energy losses, making it an essential parameter for maintaining operational reliability.
Yes, by inputting updated values for heat transfer, enthalpy of steam, and enthalpy of condensate, the calculator can adapt to changing conditions.
Steam enthalpy values are available in standard steam tables, which provide the necessary properties based on pressure and temperature.