Development%20of%20EUC%20(End%20User%20Computing)%20System%20for%20the%20Design%20of%20HVAC%20(Heating,%20Ventilation%20and%20Air%20Conditioning) - PowerPoint PPT Presentation

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Development%20of%20EUC%20(End%20User%20Computing)%20System%20for%20the%20Design%20of%20HVAC%20(Heating,%20Ventilation%20and%20Air%20Conditioning)

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... specifications of a variety of air-conditioners and buildings as a set of Q1 files. ... Center Plane of Air Conditioner. Measured. Computed. Verification of ... – PowerPoint PPT presentation

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Title: Development%20of%20EUC%20(End%20User%20Computing)%20System%20for%20the%20Design%20of%20HVAC%20(Heating,%20Ventilation%20and%20Air%20Conditioning)


1
Development of EUC (End User Computing) System
for the Design of HVAC (Heating, Ventilation
and Air Conditioning)
  • O.Yoshida, M.Andou
  • Tokyo Gas Co., Ltd.

2
Contents
  • Introduction
  • Feature of the EUC system
  • Wide variety of DB (data-base)
  • Original user-subroutines
  • Verification of DB
  • Conclusions

3
Introduction
  • CFD methods have become a promising tool to
    optimise design parameters of HVAC by predicting
    thermal environment in buildings.
  • While many advantage are expected, CFD codes
    still require lots of expertise and time for
    designers to model and predict indoor
    environment.
  • Wider application of CFD has been expected, in
    particular, to the field of EUC that designers
    and even sales engineers can easily take
    advantage of.

An EUC system for the optimal design of HVAC has
been developed.
4
Feature of the EUC System
  • Utilisation of PHOENICS
  • Flexible pre-processor
  • Powerful solver
  • Easy VR post-processor
  • Uniquely customised to predict indoor environment
    in faster, more accurate and user-friendly
    manners
  • Wide variety of DB (data-base) for the analysis
    of HVAC
  • Original user-subroutines
  • Verification of DB

5
Wide Variety of DB (Data-base)
  • The system incorporated DB compiled during
    various cases of predictions and experiments.
  • The DB provides typical specifications of a
    variety of air-conditioners and buildings as a
    set of Q1 files.
  • It also maintains previous Q1 and PHI files as
    reference, which can be readily upgraded to
    predict similar problems .

6
Original User-subroutines
  • Along with the DB, series of practical
    user-subroutines have been developed using
    GROUND.
  • These user-subroutines are applicable to predict
    ideal performance and operating conditions of
    air-conditioning units under desired optimal
    thermal environment.
  • Optimisation of input conditions such as efflux
    temperature is conducted to obtain desired
    thermal environment in a room.

7
Original User-subroutines - ExamplePrediction of
Optimal Efflux Temp.
  • Mean temperature at the height of 0.6m for each
    of perimeter and interior areas needs to be 22?
    to achieve desired thermal environment.

Unit_P(Q9m3/min)
Unit_I1(Q6) Unit_I2(Q6)
Interior (Area_I)
Perimeter (Area_P)
  • Efflux temperatures are separately controlled
    with reference to respective area temperature.

8
Original User-subroutines - Example Algorithm
9
Original User-subroutines - Example Temperature
Distributions
10
Verification of DB
  • Prediction accuracy of DB of the system was
    verified a-priori, by comparing with detailed
    measurements.
  • Know-hows to generate a numerical grids have been
    compiled to secure practical accuracy with
    minimum calculation time .

11
Verification of DB - Example Artificial Climatic
Room
12
Verification of DB - Example Heating Conditions
13
Verification of DB - Example Numerical Analysis
  • PHOENICS 3.2
  • Steady states
  • Rectangular grids
  • 383233 40128cells
  • Elliptic-staggered equation
  • k-epsilon turbulence model
  • Hybrid differencing schemes
  • Boussinesq buoyancy model

14
Verification of DB - Example Center Plane of Air
Conditioner
15
Verification of DB - Example Center Plane of
Model Room
Measured
Computed
16
Verification of DB - Example Temperature Profiles
17
Conclusions
  • An useful EUC system for the optimal design of
    HVAC has been developed using PHOENICS.
  • The system incorporated DB for the analysis of
    HVAC as a set of Q1 files .
  • Along with the DB, practical user-subroutines
    have been developed.
  • Prediction accuracy of the system was verified
    a-priori, by comparing with detailed
    measurements.
  • Computed result with incorporate DB was in good
    agreement with measured result.
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