Analysis of the influence of the return position in the vertical temperature gradient in displacement ventilation systems for large halls

Gil López, Tomás; Gálvez Huerta, Miguel A.; O'Donohoe, Paul G.; Castejón Navas, Juan y Diéguez Elizondo, Pedro M. (2017). Analysis of the influence of the return position in the vertical temperature gradient in displacement ventilation systems for large halls. "Energy and buildings", v. 140 ; pp. 371-379. ISSN 0378-7788. https://doi.org/10.1016/j.enbuild.2017.02.017.

Descripción

Título: Analysis of the influence of the return position in the vertical temperature gradient in displacement ventilation systems for large halls
Autor/es:
  • Gil López, Tomás
  • Gálvez Huerta, Miguel A.
  • O'Donohoe, Paul G.
  • Castejón Navas, Juan
  • Diéguez Elizondo, Pedro M.
Tipo de Documento: Artículo
Título de Revista/Publicación: Energy and buildings
Fecha: 2017
Volumen: 140
Materias:
Palabras Clave Informales: Displacement ventilation, High ceiling space, Return point height, Roof temperature
Escuela: E.T.S. de Edificación (UPM)
Departamento: Tecnología de la Edificación
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Displacement ventilation systems are widely used in spaces of small and medium heights (up to 7.5 m), taking advantage of their high efficiency in removing contaminants by means of the air stratification. This outcome usually hides major drawbacks compared to admixture systems, such as inadequate temperature gradient in the occupied zone and low cooling capacity. On the contrary, its use in large spaces with high ceilings displays the best features of the system, provided the return is placed near the ceiling. When, due to architectural reasons, this option is not feasible, alternatives for the return position are assessed using simulation tools that result in excessive time consumption during the design stage. In this article a simple Mundt?s equation based iterative process is proposed to quickly evaluate the influence of the return height in the vertical temperature gradient and the additional cooling load due to overheated ceiling. It has been applied to the case of Madrid airport new terminal, and their results have been compared to a CFD simulation, with a reasonable degree of accuracy for an initial stage of a design process. The results show that the higher the return is placed, the lesser airflow rate is needed to match the additional cooling load due to radiation from the ceiling. The calculation process also shows that Mundt?s radiant heat exchange coefficient is far from being constant, for it is affected by the height of the return point, and takes values much greater than the usually accepted.

Más información

ID de Registro: 48704
Identificador DC: http://oa.upm.es/48704/
Identificador OAI: oai:oa.upm.es:48704
Identificador DOI: 10.1016/j.enbuild.2017.02.017
URL Oficial: https://www.sciencedirect.com/science/article/pii/S0378778816318722
Depositado por: Memoria Investigacion
Depositado el: 18 Jun 2018 09:05
Ultima Modificación: 18 Jun 2018 09:05
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