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# Energy Transfer Equation

## Fluid energy transfer.

The energy transfered with a substance can be expressed as

Q = m cp dt                                   (1)

where

Q = quantity of energy transferred (kJ, Btu)

m = mass of substance (kg, lb)

cp = specific heat of the substance (kJ/kgoC, kJ/kgoK, Btu/lb oF)

dt = temperature difference (rise or fall) in the substance (oC, K, oF)

### Example - Energy Transfer with Water

2 kg of water is heated from 20oC to 60oC. The specific heat of water is 4.2 kJ/kgoC. The heat transfered can be calculated as

Q = (2 kg) (4.2 kJ/kgoC) ((60oC) - (20oC))

= 336 kJ

= (336 kWs) (1/3600 h/s)

= 0.093 kWh

## Related Topics

• ### Thermodynamics

Work, heat and energy systems.

## Related Documents

• ### 1st Law of Thermodynamics

The First Law of Thermodynamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing.
• ### Carnot Efficiency

The efficiency of the Carnot cycle.
• ### Condensation of Steam - Heat Transfer

Heat transfer when steam condensates.
• ### Conductive Heat Transfer

Conductive heat transfer takes place in a solid if there is a temperature gradient.
• ### Convective Heat Transfer

Heat transfer between a solid and a moving fluid is called convection. This is a short tutorial about convective heat transfer.
• ### Energy

Energy is the capacity to do work.
• ### Energy Accumulated in Heated Water - kWh

The amount of thermal energy stored in heated water.
• ### Energy Conversion Factors

Convert between energy units
• ### Heat Recovery Efficiency

Classification of heat recovery efficiencies - temperature efficiency, moisture efficiency and enthalpy efficiency - online heat exchanger efficiency calculator.
• ### Heat, Work and Energy

Heat vs. work vs. energy.
• ### Heating Up Applications - Energy Required and Heat Transfer Rates

Energy required to heat up a substance.

Heat transfer due to emission of electromagnetic waves is known as thermal radiation.
• ### Steam Heating Processes - Load Calculating

Calculating the amount of steam in non-flow batch and continuous flow heating processes.

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## Citation

• The Engineering ToolBox (2008). Energy Transfer Equation. [online] Available at: https://www.engineeringtoolbox.com/energy-transfer-equation-d_1051.html [Accessed Day Month Year].

Modify the access date according your visit.

9.29.12