Ventilation for People

Abstract

The developing trend that Building Regulations in the future will be applied to buildings in use rather than to their design intent on paper has many important implications. It will lead to pressure testing of new buildings to ensure air tightness, low energy bills and the associated absence of draughts. Importantly, it means that for the first time, the ventilation air will enter the building through the air inlet ductwork. This offers the designers the opportunity to control the indoor environment to create refreshing comfortable climate while retaining low energy use. The three critical factors are sufficient air to dilute odours, better filtration to remove particulate matter with the implications of this for health, and controlled humidity for comfort and freshness.

Condensation risk of DCDV system for hot and humid Hong Kong

“…The range of variations, as summarised in Table 3, was determined based on a review of the design values adopted by existing office buildings in Hong Kong. 25 There are altogether 17 cases (cases [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] included in the parametric study; and the design values of the original case (base case) are also shown in Table 3. …”

“…Consequently, SHR, Q L and Q T are affected. Table 4 also summarises the annualised Q S , Q L , Q T and SHR of the base case and the additional 17 cases (cases [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

“…1,2 Conventional air-conditioning system relies on the use of over-cooled supply air to enable the removal of space moisture. As such, the supply air is typically close to saturation (i.e.…”

“…With today's higher ventilation requirements and the hot and humid climate in Hong Kong, moisture becomes a higher percentage of the total cooling load that a conventional air handling unit must handle. 1,2 Conventional air-conditioning system relies on the use of over-cooled supply air to enable the removal of space moisture. As such, the supply air is typically close to saturation (i.e.…”

Low-Carbon Housings and Indoor Air Quality

“…There are various literature providing reviews and assessment of the effectiveness of various types of ventilations for various types of buildings [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62]. To satisfy the requirement of the building regulations (or building codes) of various countries, mechanical ventilation with heat recovery is required and there are various reports regarding the effectiveness of such system in terms of improving IAQ of homes [63][64][65] and offices [66][67][68][69][70]. There is also an increase use of demand control ventilation [71][72][73][74], higher efficiency of filters [75][76][77] and air-cleaning systems [78À81].…”