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Natural Gas Demand Apartments

Reference data and engineering information about natural gas demand apartments for combustion applications.

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Overview

Engineering reference data for Natural Gas Demand Apartments in combustion engineering.

Key Formulas

Heat Release

Q=m˙⋅HVQ = \dot{m} \cdot HV

Fuel energy release rate.

Air-Fuel Ratio

AF=mairmfuelAF = \frac{m_{air}}{m_{fuel}}

Mass of air per mass of fuel.

Excess Air

EA=O221−O2×100%EA = \frac{O_2}{21 - O_2} \times 100\%

From flue gas oxygen measurement.

Variables

Symbol Description Unit
QQ Heat release rate W
m˙\dot{m} Mass flow rate kg/s
HVHV Heating value J/kg
AFAF Air-fuel ratio —

Unit Conversions

The natural gas demand calculations can be expressed in two common units:

  • Cubic feet per hour (cfh): Standard imperial unit.
  • Cubic meters per hour (m³/h): Standard metric unit.

Conversion Factor:

1 m3/h≈35.3147 cfh1 \text{ m}^3/\text{h} \approx 35.3147 \text{ cfh}

To convert a flow rate from m³/h to cfh, multiply by 35.3147. To convert from cfh to m³/h, divide by 35.3147.

Gas Demand Formula

The total hourly gas demand for a building with multiple apartments is calculated by summing the demand from all individual appliances and fixtures.

Primary Formula:

Qtotal=∑(N×Qappliance×Fdiversity)Q_{\text{total}} = \sum (N \times Q_{\text{appliance}} \times F_{\text{diversity}})

Where:

  • QtotalQ_{\text{total}} = Total building gas demand (in cfh or m³/h).
  • NN = Number of each specific appliance type.
  • QapplianceQ_{\text{appliance}} = Rated gas consumption of a single appliance (cfh or m³/h).
  • FdiversityF_{\text{diversity}} = A factor (≤ 1.0) accounting for the probability that all appliances operate at peak load simultaneously.

References