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Development of EUC (End User Computing) System for the Design of HVAC ( Heating, Ventilation and Air Conditioning) PowerPoint Presentation
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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. . Contents. Introduction Feature of the EUC system Wide variety of DB (data-base) Original user-subroutines Verification of DB

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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.

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

feature of the euc system
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
wide variety of db data base

Q1

Q1

A/C DB

A/C type

Building DB

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 .
original user subroutines
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.
original user subroutines example prediction of optimal efflux temp

Z=0.6m

Window

Office Room Type (Outside of Temp. = 0 C)

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(Q=9m3/min)

Unit_I1(Q=6)Unit_I2(Q=6)

Interior (Area_I)

Perimeter (Area_P)

  • Efflux temperatures are separately controlled with reference to respective area temperature.
original user subroutines example algorithm

Start

Tm_start=22 C, Tm_end=22 C, Te_start=40 C

EARTH Solution

Calculate Tm

Te

Calculate Rlx (Relax. factor)

by Residual of NETSOURCE

Tm

Te=Te+(Tm_end-Tm)*Rlx

LSWEEP ?

No

Yes

End

Temperatures. vs. Sweep No.

Original User-subroutines - ExampleAlgorithm
original user subroutines example temperature distributions

Efflux temp ≒ 30.6C Efflux temp ≒ 29.8C

Center plane of A/C units

Mean temp ≒ 22.0C Mean temp ≒ 22.0C

Plane at Z=0.6m

Original User-subroutines - ExampleTemperature Distributions
verification of db

Computation

Measurement

Verification

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 .
verification of db example heating conditions

Neighboring Temp. = 10 C

Air-Conditioning unit

Sink

Efflux Temp. = 46C

Outside of Temp. = 0 C

Living Room Type

Verification of DB - ExampleHeating Conditions
verification of db example numerical analysis

Numerical Grid

Verification of DB - ExampleNumerical Analysis
  • PHOENICS 3.2
  • Steady states
  • Rectangular grids

38×32×33 = 40128cells

  • Elliptic-staggered equation
  • k-epsilon turbulence model
  • Hybrid differencing schemes
  • Boussinesq buoyancy model
conclusions
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.