Figure 3.1 shows a concrete hut of dimensions 10 m x 10m x 3m. On each...

  

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Figure 3.1 shows a concrete hut of dimensions 10 m x 10m x 3m. On each wall there is a window of area 1.2 m. A metal door of area 2 m is installed on the front wall. The average U-values of the concrete roof, a side wall with a window and the front wall with a metal door are 1.5 W m K', 1.67 W m K' and 2.02 W m K respectively. Figure 3.1 front wall window roof 10 m door 3 m 10 m (a) The outdoor temperature is 30C. The rate of heat transfer by radiation per unit area of the window is 160 W m. The indoor temperature is to be maintained at 24C with an air-conditioner. (i) Find the rate of heat transfer by conduction through the hut envelope. (ii) Find the OTTV of the hut envelope. Figure 3.1 shows a concrete hut of dimensions 10 m x 10m x 3m. On each wall there is a window of area 1.2 m. A metal door of area 2 m is installed on the front wall. The average U-values of the concrete roof, a side wall with a window and the front wall with a metal door are 1.5 W m K', 1.67 W m K' and 2.02 W m K respectively. Figure 3.1 front wall window roof 10 m door 3 m 10 m (a) The outdoor temperature is 30C. The rate of heat transfer by radiation per unit area of the window is 160 W m. The indoor temperature is to be maintained at 24C with an air-conditioner. (i) Find the rate of heat transfer by conduction through the hut envelope. (ii) Find the OTTV of the hut envelope. Figure 3.1 shows a concrete hut of dimensions 10 m x 10m x 3m. On each wall there is a window of area 1.2 m. A metal door of area 2 m is installed on the front wall. The average U-values of the concrete roof, a side wall with a window and the front wall with a metal door are 1.5 W m K', 1.67 W m K' and 2.02 W m K respectively. Figure 3.1 front wall window roof 10 m door 3 m 10 m (a) The outdoor temperature is 30C. The rate of heat transfer by radiation per unit area of the window is 160 W m. The indoor temperature is to be maintained at 24C with an air-conditioner. (i) Find the rate of heat transfer by conduction through the hut envelope. (ii) Find the OTTV of the hut envelope. Figure 3.1 shows a concrete hut of dimensions 10 m x 10m x 3m. On each wall there is a window of area 1.2 m. A metal door of area 2 m is installed on the front wall. The average U-values of the concrete roof, a side wall with a window and the front wall with a metal door are 1.5 W m K', 1.67 W m K' and 2.02 W m K respectively. Figure 3.1 front wall window roof 10 m door 3 m 10 m (a) The outdoor temperature is 30C. The rate of heat transfer by radiation per unit area of the window is 160 W m. The indoor temperature is to be maintained at 24C with an air-conditioner. (i) Find the rate of heat transfer by conduction through the hut envelope. (ii) Find the OTTV of the hut envelope.