Question

PLease calculate the question about condensation in building
(d) A wall consists of 15mm dense plaster (1), 100 medium weight concrete blockwork (2), 40mm glass fiber quilt (3), a 10mm air space (4) and 105mm brickwork (5). The composition of the wall is shown in Figure 1. In a winter day, the indoor air temperature and relative humidity are maintained at 20°C and 60% while the outdoor air temperature is 0°C. The vapor resistivities of the wall components are shown in Table 1. The vapor pressure decreases from the surface of component 1 (concrete blockwork to the interface between 1 and 2 and the reduction is found to be 30 Pa. Determine: i) the rate of water vapor transport through the wall. (15%) (ii) the relative humidity of the outdoor air (15%) Table 1. vapor resistivity of the wall components vapor resistivity (GN.s/kg.m) Material Dense plaster 50 Medium weight concrete blockwork 200 Glass fibre quilt 10 Brickwork 40

Answer 1

x Thickne vapor Reitivity. 0-15 20 0.4 200 100R 10 40 x 10 Ox 10110 40105 x10 4-1 anot Rot of water uopaur irangotrocor disfant esistance kg Rattot wattr. vapour transport-.10 : 0.15 vapr Prscurt at 10'c ( indoar side 1.5 torr fom 5 torr trom 233 S lievatun TR) 933340 10 な市

PAGE No. Napor frrcgun diffesenceate x Total Ritane 40 35 45 x 10 10 vapor Outdoor PrecureIndoor lresron -iffence 1133-1014- 1313 Pa Rolative Aumidity 131 215