Abstract
Based on the design of traditional architecture, windcatchers are devices which provides passive ventilation by manipulating pressure differentials around buildings induced by the movement of wind and difference in temperature. In temperature climates, it is effective in providing passive cooling during summer months. However, during winter months, the low air temperature supplied to the space can cause further thermal discomfort and increase heat loss which lead to higher energy consumption. This limits the capabilities of windcatchers to provide ventilation all year round. To address this issue, the present study proposes incorporating a rotary thermal heat recovery device into the windcatcher channel and investigate its performance using numerical modelling and experimental tests. The study focused on characterizing the design and performance of the copper radial blades of the proposed heat recovery device. The predicted results of the airflow and temperature showed good agreement with the experimental tests. Two types of radial blade designs were assessed in terms of the airflow velocity and distribution, the pressure drop and the heat recovery performance.
Highlights
The commitment of UK government in minimizing greenhouse gas emission by at least eighty percent of 1990 levels in the year 2050 has been the greatest drive in reduction of energy use within the built environment [1]
The present study used numerical modelling and experimental tests to investigate the performance of a rotary heat recovery device for a natural ventilation windcatcher
The study focused on characterizing the design and performance of the copper radial blades of the proposed heat recovery device
Summary
The commitment of UK government in minimizing greenhouse gas emission by at least eighty percent of 1990 levels in the year 2050 has been the greatest drive in reduction of energy use within the built environment [1]. This type of system provides fresh air driven by the air pressure on the wind ward area, while exhausting stale air assisted with suction pressure on the leeward area. It can function using the stack effect method; the air mass reduces when the temperature rises, resulting warmer air to go up and depart the windcatcher’s openings. In countries with temperate climate like the United Kingdom, their operation is limited during summer This is due to the low temperature of the incoming or supply air that can lead to thermal discomfort within the occupied space and increase heat loss [6]. While when the use of natural ventilation is restricted, the mixture of contaminants has been observed to increase more than the recognised guidance levels, that can result to illness and poor mental performance [5,6]
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