.Buildings.Fluid.DXSystems.Cooling.BaseClasses.UACp

Information

This model calculates the UA/c_p value and the bypass factor of the coil from the nominal inlet and outlet air properties.

For a heat exchanger where one medium changes phase, the NTU-ε relation is

ε = 1 - exp(-NTU) = 1-exp(-UA ⁄ c_p ⁄ ṁ).

Since the bypass factor b is defined as b=1-ε, one can write

b = exp(-UA ⁄ c_p ⁄ ṁ)

and, hence,

UA ⁄ c_p = - ṁ log(b).

Contents

Name	Description
Medium	Medium model

Revisions

• November 11, 2020, by Michael Wetter:
  Refactored to integrate directly a base class that was used only once in the library.
  This is for #2229.
• April 14, 2020, by Michael Wetter:
  Changed homotopyInitialization to a constant.
  This is for IBPSA, #1341.
• September 21, 2012 by Michael Wetter:
  Revised implementation and documentation.
• April 9, 2012 by Kaustubh Phalak:
  First implementation.