Simulation model finned water-air-coil withoutcondensation Metadata

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Title

  • Main Title Simulation model finned water-air-coil withoutcondensation

Creator

  • Author: Wetter, Michael
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy. Office of Science.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Science (SC) (United States)

Publisher

  • Name: Lawrence Berkeley National Laboratory
    Place of Publication: Berkeley, California
    Additional Info: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States)

Date

  • Creation: 1999-01-01

Language

  • English

Description

  • Content Description: A simple simulation model of a finned water-to- air coil without condensation is presented. The model belongs to a collection of simulation models that allows eficient computer simulation of heating, ventilation, and air-conditioning (HVAC) systems. The main emphasis of the models is short computation time and use of input data that are known in the design process of an HVAC system. The target of the models is to describe the behavior of HVAC components in the part load operation mode, which is becoming increasingly important for energy efficient HVAC systems. The models are intended to be used for yearly energy calculation or load calculation with time steps of about 10 minutes or larger. Short-time dynamic effects, which are of interest for different aspects of control performance, are neglected. The part load behavior of the coil is expressed in terms of the nominal condition and the dimensionless variation of the heat transfer with change of mass flow and temperature on the water side and the air side. The effectiveness- NTU relations are used to parametrize the convective heat transfer at nominal conditions and to compute the part load conditions. Geometrical data for the coil are not required, The calculation of the convective heat transfer coefficients at nominal conditions is based on the ratio of the air side heat transfer coefficients multiplied by the fin eficiency and divided by the water side heat transfer coefficient. In this approach, the only geometrical information required are the cross section areas, which are needed to calculate the~uid velocities. The formulas for estimating this ratio are presented. For simplicity the model ignores condensation. The model is static and uses only explicit equations. The explicit formulation ensures short computation time and numerical stability. This allows using the model with sophisticated engineering methods such as automatic system optimization. The paper fully outlines the algorithm description and its simplifications. It is not tailored for a particular simulation program to ensure easy implementation in any simulation program.
  • Physical Description: 21 pages

Subject

  • STI Subject Categories: 32 Energy Conservation, Consumption, And Utilization
  • Keyword: Computerized Simulation
  • Keyword: Heat Exchangers
  • STI Subject Categories: 42 Engineering Not Included In Other Categories
  • Keyword: Space Hvac Systems

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE00007353
  • Report No.: LBNL--42355
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/7353
  • Office of Scientific & Technical Information Report Number: 7353
  • Archival Resource Key: ark:/67531/metadc712237