Analysis of the Thermal Flow Fields and Thermal Comfort for a Ventilation System with a Cooling Pad

Autor: Yen-Chi Liao, 廖彥棋
Rok vydání: 2012
Druh dokumentu: 學位論文 ; thesis
Popis: 100
Taiwan locating in the subtropical area consumes a lot of energy on air condition in summer. Therefore, to save the energy from air conditioning is very helpful for the energy saving and carbon reduction. Usually, the compressor uses the largest portion of air conditioning energy consumption. If we can lower the air temperature by using a natural heat-exchange way, it can significantly reduce the energy consumption. A ventilation system with a cooling pad belonged one of these ways, it is mainly to decrease the temperature of air that flows into house by transferring heat to the vaporization water drops. The installing design and the location choice of air flow entrance for this system are very important to the indoor temperature distribution. Therefore, it is worthful to investigate different flow inlets, and to make an appropriate arrangement for achieving a thermal comfort condition. In this study, computational fluid dynamics software, ANSYS CFX, is used for simulating three-dimensional transient indoor air flow for a factory which installs a ventilation system with a cooling pad. The indoor temperature, velocity field and humidity distribution are studied. And the predicted mean vote and predicted percentage of dissatisfied are calculated to understand the distribution of indoor thermal comfort. The thermal comfort of this factory space is investigated by evaluating the PMV and PPD values on the cross section of 1.5 meters high. The results showed that, most cold air exists in the lower part of space due to buoyancy effect, resulting in cross sections of Y=1.5m cooling faster. Based on the evaluation area set in this study, case 1 presents better PMV and PPD distributions and it is a suitable arrangement for the studying factory space.
Databáze: Networked Digital Library of Theses & Dissertations
Externí odkaz: