ROOM #1

WALL - OUTSIDE

WINDOWS - OUTSIDE

DOOR - OUTSIDE

k

15

k

10

k

5

S(door)

2

dT

35

dT

35

dT

35

S(window)

2

thickness

20

thickness

1

thickness

5

Furnace

S(wall-outside)

27

Q(wa-o)

708.75

Q(win-o)

1400

Q(d-o)

70

P1

2178.75

ROOM #2

WALL - OUTSIDE

WINDOWS - OUTSIDE

DOOR - OUTSIDE

k

15

k

10

k

5

S(door)

0

dT

35

dT

35

dT

35

S(window)

2

thickness

20

thickness

1

thickness

5

Furnace

S(wall-outside)

29

Q(wa-o)

761.25

Q(win-o)

1400

Q(d-o)

0

P2

2161.25

K( wall 1 - 0)

20.25

big K's are computed the same as Q's but without multiplying by dT

K( window 1 - 0)

40

K( door 1 - 0)

2

Equations (PART 2): findinf T1, T2 when P1, P2 are known

K( wall 1 - 2)

9.75

Room1:

P1 = Kw10(T1-T0) + Kwin10(T1-T0) + Kd10(T1-T0) + Kw12(T1-T2) + Kd12(T1-T2)

K( door 1 - 2)

2

Room2:

P2 = Kw20(T2-T0) + Kwin20(T2-T0) + Kw21(T2-T1) + Kd21(T2-T1)

K( wall 2 - 0)

21.75

K( window 2 - 0)

40

Room1:

3000 = 20.25*(T1+10) + 40*(T1+10) + 2*(T1+10) + 9.75*(T1-T2) + 2*(T1-T2)

K( wall 2 - 1)

9.75

Room2:

3000 = 21.75*(T2+10) + 40*(T2+10) + 9.75*(T2-T1) + 2*(T2-T1)

K( door 2 - 1)

2

(assuming outside temperature T0=-10, and P1=P2=3 kW)

Indexes:

1 - room 1

2 - room 2

0 - outside