Pris: 29,-

Abstrakt

Compared with traditional mixing ventilation, the under-floor air distribution (UFAD) system may achieves better performance in energy saving and thermal comfort and has been developed rapidly in recent decades. As one of the most important devices, the swirling diffuser has been studied for years because of the great impact on the performance of UFAD system. This paper mainly focused on the influences of throwing angle on the capability of swirling diffusers from the view point of thermal comfort. Four different throwing angles were simulated and the results indicated that the throwing angle has significant effect on both the local and whole thermal comfort. Meanwhile, as a convenient method to evaluate thermal comfort in stratified environment, the ISO 14505 index is worthy to be further developed. Also, three thermal regulation modes for the detailed manikin have been investigated. The comparison results revealed that the impact of the regulation principle on the equivalent temperature was diminished when clothing resistance was considered in the simulation.

Referanser

ASHRAE, ASHRAE Standard 55-2004. (2004) Thermal Environment Conditions for Human Occupancy, Atlanta: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc

Fanger, P. O. (1970) Thermal Comfort, Copenhagen: Danish Technical, Doctoral Thesis

Fiala D., Psikuta A., Jendritzky G. (2010) Physiological modeling for technical, clinical and research applications, Frontiers in Bioscience S2, 939-968

Gao NP, Zhang H, Niu JL. (2007) Investigating indoor air quality and thermal comfort using a numerical thermal manikin, Indoor and Built Environment, 16(1):7-17.

ISO/TS, (2007) ISO/TS 14505: Ergonomics of the thermal environment － Evaluation of thermal environments in vehicles

ISO 7730 (2005) Ergonomics of the thermal environment － Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria

Lian ZW., Wang HY., Chen KR. (2004) Design methods for air distribution of under floor air supply systems, HVAC 34 (2): 51–54 (in Chinese)

Melikov A., Zhou HQ. (1999) Comparison of methods for determining eq t under well-defined conditions, Paper for the CABCLI seminar-EC cost contact No SMT4-CT98-6537

Nilsson HO. (2007) Thermal comfort evaluation with virtual manikin methods, Building and Environment, 42:4000-4005

Nilsson HO, Brohus H, Nielsen PV. (2007) Bechmark tests for a computer simulated person – manikin heat loss for thermal comfort evaluation, Aalborg University Denmark & Gavle University Sweden

Srebric, J. and Chen, Q. (2002) Simplified numerical models for complex air supply diffusers, HVAC&R Research, 8(3), 277-294

Vivian LB, Rohini, Michelle M, Edward V, Mike M. (2002) Energy savings potential of flexible and adaptive HVAC distribution systems for office buildings, ARTI21-CR Research Project 605-30030, Carnegie Mellon University, Pittsburgh, PA

Webster T, Bauman F, Ring E. (2002) Supply fan energy use in pressurized under-floor air distribution system, In: CBE Summary Report, Berkeley

Xu, H. and Niu, J. (2003) A new method of CFD simulation of airflow characteristics of swirling floor diffusers, Proc. 8th Int, IBPSA Conf. (Building Simulation 2003), Eindhoven, the Netherlands, 1429– 1434

Zhang H. (2003) Human thermal sensation and comfort in transient and non-uniform thermal environments, Ph. D. Thesis, University of California Berkeley 2003, 415pp





Forrige artikkel      Neste artikkel