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Title: Ventilation design of combing spacer and mesh structure in sports t-shirt
Authors: Au, JS 
Issue Date: May-2015
Abstract: This body of work reports on the novel ventilation design in sports T-shirt, which combines spacer and mesh structure, and experimental evidence on the advantages of design in improving thermal comfort. The novel sports T-shirt design significantly increase the air circulation next to skin and ventilation cooling under windy condition and/or active body movement comparing to the conventional T-shirts designs.
The T-shirts of novel and conventional designs were compared by: (i) measuring their evaporative resistance (Re) and thermal insulation (Rc) with a sweating thermal manikin under three different air velocities. Moisture permeability index (im) was also calculated to compare the different designed T-shirts, (ii) conducting wearer trials comprising of 30 min treadmill running followed by 10 min rest. Skin temperature, skin relative humidity, heart rate, oxygen inhalation and energy expenditure were monitored, and subjective sensations were examined.
Results demonstrated that under windy condition, the moisture permeability index (im) of T-shirt with ventilation structures decreased about 11.1% compared to that of conventional one. Under the real exercise situation, the novel sports T-shirt with the new ventilation design contributed to the reduction of heat accumulation, the increase of skin relative humidity, and the decrease of hot and chill discomfort. The variation of skin temperature and relative humidity reduced up to 37% and 32% respectively. The wearer felt more comfort with the novel ventilation designed garment during exercise, especially in post-exercise phase. The new ventilation design also contributed to the reduction of 3.3% energy expenditure during exercise, which is expected to be applied on the active sportswear like those for jogging, racket sports, and ball games, etc.
Rights: All rights reserved.
Posted with permission of the author.
Appears in Collections:Design Research Portfolio

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