10) Operational changes need to be continually implemented and properly documented and retained specially implementation plan to track key energy efficiency operational changes. Maintain communication between Energy Manager, operators, maintenance, and management and document savings to justify energy efficiency program.

6. Concluding Remarks

The complexity of HVAC systems in healthcare premises is increasing due to the additional functions. The HVAC system in this case is intended to provide the comfort and to remove any airborne contaminants that are produced in this application. These design criteria do not influence the HVAC system only, but may also require a special care in the architectural design and including the choice of the room furniture and its location. The designers of HVAC systems should consider, for energy optimization, the importance of the air distribution; the positioning of operating furniture and the using of partial walls may be useful to maintain the air environment in the surgical operating theatres.

It is believed that for the purpose of the energy-efficient operation Air Conditioning and other systems in large healthcare facilities, the energy manager should take into account the tips that are set here in this work. Different actors need different information. For giving relevant advice to the property owner which measures are cost-effective a very careful examination and calculation of the building’s energy balance is necessary. A careful analysis is also necessary to give relevant information to the users how they can decrease their energy use without decreasing, under an acceptable level, the indoor air quality and thermal comfort.

7. Acknowledgements

The author would like to acknowledge the assistance given to him by his colleagues and students, particular thanks are due to Dr. R. Kameel and Dr. A. Medhat and Eng. Rana Khalil.

REFERENCES

- L. G. Berglund, “Comfort and Humidity,” ASHRAE Journal, Vol. 40, No. 8, 1998, pp. 35-41.
- M. H. Hosni, K. Tsai and A. N. Hawkins, “Numerical Predictions of Room Air Motion,” ASME Fluids Engineering Division Conference, Part 2, 1996, pp. 745-750.
- A. M. Medhat, “Air Conditioning Flow Patterns in Enclosures,” M.Sc. Thesis, Cairo University, Cairo, 1993.
- E. E. Khalil, “Three-Dimensional Flow Pattern in Enclosures,” Interim Report, Egyptalum, Egypt, 1994.
- E. E. Khalil, “Fluid Flow Regimes Interactions in Air Conditioned Spaces,” Proceedings of 3rd Jordanian Mechnical Engineering Conference, Amman, May 1999.
- E. E. Khalil, “Computer Aided Design for Comfort in Healthy Air Conditioned Spaces,” Proceedings of Healthy Buildings 2000, Finland, Vol. 2, 2000, pp. 461-466.
- R. Kameel, “Computer Aided Design of Flow Regimes in Air Conditioned Spaces,” M.Sc. Thesis, Cairo University, Cairo, 2000.
- R. Kameel, “Computer Aided Design of Flow Regimes in Air Conditioned Operating Theatres,” Ph.D. Thesis Work, Cairo University, Cairo, 2002.
- R. Kameel and E. E. Khalil, “Computer Aided Design of Flow Regimes in Air Conditioned Spaces,” Proceedings of ESDA2000 ASME 5th Biennial Conference on Engineering Systems Design & Analysis, Monteux, 2000.
- R. Kameel and E. E. Khalil, “Fluid Flow and Heat Transfer in Air Conditioned Spaces,” International Conference of Energy Systems (ICES), Amman, September 2000, 2K, pp. 188-200.
- R. Kameel and E. E. Khalil, “Numerical Computations of the Fluid Flow and Heat Transfer in Air-Conditioned Spaces,” NHTC2001-20084, 35th National Heat Transfer Conference, Anaheim, 2001.
- R. Kameel and E. E. Khalil, “Air Quality Appraisal in Air Conditioned Spaces: Numerical Analyses,” Proceedings of 4th IAQVEC Conference, Changsha, 2001, pp. 287- 297.
- R. Kameel and E. E. Khalil, “Verification of Numerical Prediction of 3-D Air-Conditioned Flow Behavior in Full and Reduced Scale Room Models,” 40th Aerospace Sciences Meeting & Exhibit, Reno, Nevada, AIAA-2002-654, 12-15 January 2002.
- D. B. Spalding and S. V. Patankar, “A Calculation Procedure for Heat, Mass and Momentum Transfer in Three Dimensional Parabolic Flows,” International Journal of Heat and Mass Transfer, Vol. 15, 1974, pp. 1787-1799.
- B. E. Launder and D. B. Spalding, “The Numerical Computation of Turbulent Flows,” Computer Methods in Applied Mechanics and Engineering, Vol. 3, No. 2, 1974, pp. 269-275. doi:10.1016/0045-7825(74)90029-2
- E. E. Khalil, “Flow, Combustion & Heat Transfer in Axisymmetric Furnaces,” Ph.D. Thesis, London University, London, 1977.
- E. E. Khalil, D. B. Spalding and J. H. Whitelaw, “The Calculation of Local Flow Properties in Two-Dimensional Furnaces,” International Journal of Heat and Mass Transfer, Vol. 18, 1975, pp. 775-792. doi:10.1016/0017-9310(75)90207-0
- R. Kameel and E. E. Khalil, “Generation of the Grid Node Distribution Using Modified Hyperbolic Equations,” 40th Aerospace Sciences Meeting & Exhibit, Reno, Nevada, AIAA-2002-656, January 2002.
- S. V. Patankar, “Numerical Heat Transfer and Fluid Flow,” Hemisphere Pub., WDC, 1980.
- H. M. Blum, “Experimental Verification of Turbulence Models,” ASHRAE Fundamentals, Vol. 1, PT30, ASHRAE, Atlanta, 1956.
- P. V. Nielsen, “Numerical Prediction of Air Distribution in Rooms,” ASHRAE, Building Systems: Room Air and Air Contaminant Distribution, 1989.
- R. A. Kameel and E. E. Khalil, “Numerical Computations of Thermal Comfort and Air Quality in Air-Conditioned Healthcare Applications,” ASME Congress 2006, Paper IMECE-13354, November 2006.
- E. E. Khalil, “Flow Regimes and Thermal Patterns in Air Conditioned Operating Theatres,” Proceedings Climamed 2006, Lyon, November 2006.
- R. A. Kameel and E. E. Khalil, “Numerical Investigation of the Airborne Contaminant Age in Surgical Operating Theatres,” AIAA Paper, AIAA-2007-0807, January 2007.
- E. E. Khalil, “Numerical Computations of Air Flow Regimes in Healthcare Facilities and Their Experimental Verifications,” IECEC Paper, AIAA-2009-4510, August 2009.
- E. E. Khalil, “Thermal Comfort and Air Quality in Sustainable Climate Controlled Healthcare Applications,” AIAA-2010-0802, Orlando, January 2010.
- E. E. Khalil, “Holistic Approach to Green Buildings from Construction Material to Services,” Proceedings of International Conference on Air-Conditioning & Refrigeration (ICACR2011), Korea, July 2011, pp. 1-7.
- E. E. Khalil, “Energy Efficiency, Air Flow Regime and Relative Humidity in Air-Conditioned Surgical Operating Theatres,” Proceedings ASHRAE, Paper ASHRAE-2012- CH-12-C056, January 2012.

Nomenclature

C_{μ} Turbulence model constant.

h Enthalpy, Kj/kg

k Turbulence kinetic energy, m^{2}/s^{2}.

U,V,W Instantaneous components of velocity in three directions, m/s.

X,Y,Z Coordinate directions.

L,W,H Length, width, height of the theatre.

Lo Length of the outlet air supply, m

δ_{ij} Kroncker delta function.

ε Turbulence dissipation rate.

Φ General dependent variable.

Γ Exchange coefficient.

μ Absolute viscosity of air, kg/ms.

ρ Density of air, kg/m^{3}.

σ Effective Prandtl number.

Subscripts

I, ,j k Denoting Cartesian coordinate direction takes the values of axes X, Y, Z.