LMTDSLockheed Martin Tactical Defense Systems
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This section gives a sample calculation of how a system would react to glide depending on heat exchangers configuration, through its influence on LMTD. To illustrate it, the R-410A unit is chosen as the "baseline," at the reference conditions described earlier.
Similarly at the condenser, an iteration is done on the temperature of beginning condensation and the corresponding LMTD is calculated, until it reaches the reference LMTD value of R-410A (4.7 K = 8.5[degrees]Ra).
In case of a zeotropic blend, the "Constant LMTD" as described earlier is used to define the conditions at the evaporator and condenser, depending on the configuration of each exchanger.
For zeotropic blends, equivalent conditions at the evaporator and condenser are assessed in both configurations per the "constant LMTD."
This is a paradox: the model used in the "constant LMTD" analysis as implemented here to handle zeotropic blends is inherently designed for in-tube evaporation and condensation.
The step of identifying the conditions at the evaporator and condenser by the constant LMTD is not needed and is not used.
* For simplification in the LMTD analysis, only the evaporation and condensation are taken into account in the calculation of the temperatures at the evaporator and condenser.
The "constant LMTD analysis" proposed takes into account the behavior of systems used in DX air-conditioning applications.