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Energy balance calculation is often done for designing a heat exchanger to determine operating parameters for hot and cold fluids such as - inlet/outlet temperatures and flow rates.
- Reliability Coefficient for Pumps
Pump Reliability Coefficient - Definition. The symbol for...
- Reliability Coefficient for Pumps
An energy balance calculation is necessary to determine the heating and cooling duties in the flowsheet. An estimate of the heat content of each stream can be rapidly determined by making the following assumptions: 1. The vapor and liquid streams have ideal properties.
Identify relevant terms for energy balances for open and closed systems. Use thermodynamic data tables to identify enthalpy, internal energy, and other thermodynamic properties using system temperatures and pressures. Solve energy balance problems using thermodynamic data.
The First Law of Thermodynamics applied to stationary closed systems as a conservation of energy principle. For a closed system (no mass transfer) process proceeding between two states: ΔE = ΔKE+ΔP E+ ΔU = Q− W. Δ E = Δ K E + Δ P E + Δ U = Q − W. This is one to commit to memory!
Apply the first law of thermodynamics to the closed system, eliminating the terms that are not applicable to the system. Solve for the unknowns by combining the first law of thermodynamics with the ideal gas law, thermodynamic tables, and other physical laws as appropriate.
Heat exchangers are typically classified according to flow arrangement and type of construction. The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions in a concentric tube (or double-pipe) construction.
The first law of thermodynamics is given as \(\Delta U = Q - W\), where \(\Delta U\) is the change in internal energy of a system, \(Q\) is the net heat transfer (the sum of all heat transfer into and out of the system), and \(W\) is the net work done (the sum of all work done on or by the system).
