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Ventilationseffektivitet i kontorsmiljö - En jämförelse av deplacerande och omblandande ventilation ur termisk komfort

Glyré, Carl-Johan and Erlandsson, Alexander (2015)
Programmes in Helesingborg
Abstract
Today there is a high focus on the energy use when constructing new buildings. This mainly depends on the increased regulations and energy classifications that have been issued. Because of this, studies have shown that mechanical cooling in office environments leads to high energy consumption and service costs. This has led to an increased interest in analyzing if cooling only through ventilation air can reach comparable results. If the analysis could lead to answers where a certain ventilation principle is to prefer to another, this could lead to important conclusions concerning thermal comfort and energy use. This study focuses on performing practical measurements that could tell which of the following ventilation principles,... (More)
Today there is a high focus on the energy use when constructing new buildings. This mainly depends on the increased regulations and energy classifications that have been issued. Because of this, studies have shown that mechanical cooling in office environments leads to high energy consumption and service costs. This has led to an increased interest in analyzing if cooling only through ventilation air can reach comparable results. If the analysis could lead to answers where a certain ventilation principle is to prefer to another, this could lead to important conclusions concerning thermal comfort and energy use. This study focuses on performing practical measurements that could tell which of the following ventilation principles, displacement ventilation and mixing ventilation, is most suitable to use in a typical office on a day with medium climate values. The study is based on two earlier investigations regarding the subject and problem. Measurements were made with three different air supplies, two displacement ventilation air supplies and one mixing ventilation air supply. Before the measurements were made a typical office was set up and two measurements of each of the ventilation air supplies were made. During the measurements the ventilation air supply amount and the ventilation air supply temperature were hold constant. This study is mainly distinguished from the other through a better adapted test room and a higher use of varying heat load. The results show that all of the ventilation air supplies reached satisfying thermal conditions with some differences between them. Both displacement ventilation supplies led to a lower air temperature in the zone where people are expected to be than using the mixing ventilation supply. The measured values regarding the experiments with displacement ventilation is found up to 1,2 °C lower than the temperature on corresponding experiments made with mixing ventilation. The experiments show relatively distinct results which affects the energy consumption for cooling. The results indicate that displacement ventilation needs less cooling energy than mixing ventilation to reach the same demands on thermal comfort. In earlier investigations in the subject energy calculations have shown a high saving potential only by increasing the supply air temperature in a room by 1-2 °C. Therefore, displacement ventilation could have a higher supply air temperature thus lowering the energy consumption for cooling the outdoor air while reaching thermal comfort. Keywords: Displacement ventilation, mixing ventilation, temperature efficiency, ventilation efficiency, varying heat load, supply air, extract air. (Less)
Please use this url to cite or link to this publication:
author
Glyré, Carl-Johan and Erlandsson, Alexander
organization
year
type
M2 - Bachelor Degree
subject
keywords
deplacerande ventilation, omblandande ventilation, temperaturverkningsgrad, ventilationseffektivitet, variabel värmelast, tilluft, frånluft
language
Swedish
id
7856632
alternative location
http://portal.ch.lu.se/Campus.NET/Services/Publication/Export.aspx?id=2917&type=doc
date added to LUP
2015-09-05 04:14:34
date last changed
2015-09-05 04:14:34
@misc{7856632,
  abstract     = {Today there is a high focus on the energy use when constructing new buildings. This mainly depends on the increased regulations and energy classifications that have been issued. Because of this, studies have shown that mechanical cooling in office environments leads to high energy consumption and service costs. This has led to an increased interest in analyzing if cooling only through ventilation air can reach comparable results. If the analysis could lead to answers where a certain ventilation principle is to prefer to another, this could lead to important conclusions concerning thermal comfort and energy use. This study focuses on performing practical measurements that could tell which of the following ventilation principles, displacement ventilation and mixing ventilation, is most suitable to use in a typical office on a day with medium climate values. The study is based on two earlier investigations regarding the subject and problem. Measurements were made with three different air supplies, two displacement ventilation air supplies and one mixing ventilation air supply. Before the measurements were made a typical office was set up and two measurements of each of the ventilation air supplies were made. During the measurements the ventilation air supply amount and the ventilation air supply temperature were hold constant. This study is mainly distinguished from the other through a better adapted test room and a higher use of varying heat load. The results show that all of the ventilation air supplies reached satisfying thermal conditions with some differences between them. Both displacement ventilation supplies led to a lower air temperature in the zone where people are expected to be than using the mixing ventilation supply. The measured values regarding the experiments with displacement ventilation is found up to 1,2 °C lower than the temperature on corresponding experiments made with mixing ventilation. The experiments show relatively distinct results which affects the energy consumption for cooling. The results indicate that displacement ventilation needs less cooling energy than mixing ventilation to reach the same demands on thermal comfort. In earlier investigations in the subject energy calculations have shown a high saving potential only by increasing the supply air temperature in a room by 1-2 °C. Therefore, displacement ventilation could have a higher supply air temperature thus lowering the energy consumption for cooling the outdoor air while reaching thermal comfort. Keywords: Displacement ventilation, mixing ventilation, temperature efficiency, ventilation efficiency, varying heat load, supply air, extract air.},
  author       = {Glyré, Carl-Johan and Erlandsson, Alexander},
  keyword      = {deplacerande ventilation,omblandande ventilation,temperaturverkningsgrad,ventilationseffektivitet,variabel värmelast,tilluft,frånluft},
  language     = {swe},
  note         = {Student Paper},
  title        = {Ventilationseffektivitet i kontorsmiljö - En jämförelse av deplacerande och omblandande ventilation ur termisk komfort},
  year         = {2015},
}