Question

(6–25) Calculate the diesel fuel consumption rate and cost during the heating season in units of mº per season for an apartment if the calorific value of the fuel is 40,000 kJ/kg and its density is 820 kg/m'. The diesel fuel cost is 0.50 JD/Lit. The efficiency of diesel boiler is 85 %. The calculated heating load of the apartment is 20 kW. The inside and outside design temperatures are 20 and 5 °C, respectively. Find the seasonal savings if a heat pump with seasonal energy efficiency ratio (SEER) = 3.1 W/W is used instead of diesel boiler if the electricity rate is 0.08 JD/KW. The outside monthly average daily temperatures in °C are: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 8 9 12 16 20 24 25 25 23 21 14 10 12 (6–26) Calculate the sensible heating load for the shown one story hall. The following data are given: U, for walls 0.567 W/m².K U for ceiling 0.830 W/mK U for floor 0.665 W/m'.K U fordoors 3.450 W/mK U, for glass windows 3.600 W/m'.K Number of windows Number of doors 3 Area for each window 2.4m x 1.8m (sliding windows) Area for each door 1.4m x 2.4m Ceiling height 2.85m T, -21°C T. = 5°C T. -10°C Mechanical ventilation 1.25 m/s Infiltration through windows 1.0 liter/s per meter crack length Infiltration through doors 5.0 liter/s per meter crack length Cp for air 1.005 kJ/kg.°C Density of air 1.15 kg/m

Answer 1

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Soln Not head transpay from the alate, Но што Twho - flveo o ocЦА - 33 Areo е Walls 12 x Aren of window doonis Аə з 2[ 2912-034 2017-s] - 124 2-4 11- к\\% 2-4 Aw = 23. Чg 3 Olehall Sensible heat lead Sot Sat bt 04 - 04 t Ovt g ง Нss Aers" van Oor= UW x Aordt о:564 у 23ч 48 (21-30 22\2 - 2 0 (6) Неd Avera Aksezoh qirdoo amx = q 1 the 5 12 Х 3.6x 244% 1+R (2t-s) | 94 = 240sq 240sqa | d that transfey through door Od = d * AdxdT = зрчѕх -4 42-4 (21-31 iv) да – 556 - 42 0 md Avrst Arsen olina So - by a ует 6-8444 24120 (21-3) Во - 4620:43W

Head load through floor Of = Ufa Aradi = 0665424720 (21-10) 1919.68 W NH Heat lhes due to Infiltration Total Cruck longth/ beurmeten of door 342 [ 1-4+2-4 22.8 " Window 1 11 = 12x2 [2-44118] = 100.8m 80 fa Ax 100. By SX 22.8 = 21408 lis at 0.2148 milser ma txp - 0-214BX1118 = 0.247 kg is mx cpydy= 0.247 x 1003 *121-5) 3971.78

(vi) Heat loss due to ventilation Volume 244 204 2-25= 1919.2 m3 Pin = 1.25x qolsa lutying Ou= macardi 1-44*100g x(2148) Or - 23155-2 w

from 2\2 1-2 t 24 09-00 1 92 (0-93 1 s(- 42 t чЯ 15-40 - \ 3411-+t T23I 352 9 ЧЫ• 3 KO