Design of Air Condioning for control Room of Hill 65Calculating of Cooling Load

Ht = Hs + Hlwhere

Ht = total heat load(Btu/hr)Hs = Sensible heat(Btu/hr)Hl = latent heat(Btu/hr)

Hs = 1.08 q dtwhere

Hs = Sensible heat(Btu/hr)q = air volume flow(cfm)dt = temperature differencr('F)

Room to be air conditioned,length = 3.66 mwidth = 2.44 mArea = 8.92 m

= 6.00 (from table 1)= 53.54 l/s

1 l/s = 2.119 cfm= 113.45 cfm

= 36.00 'C (from table 3)= 16.00 'C (from table 2)

dt = 20.00 'Cdt = 68.00 'F

ThereforeHs = 8,331.79 Btu/hr

1Btu/hr = 0.293 WattHs = 2,441.22 Watt

Table 1-Air Change RateAir Shifts Airflow Outdoorper hour (l/s per m2 Airflow

(1/h) floor area) (l/s)Sheep 3 per animalHorses 40 per animalHens 3 per animalCows 100 per animal

Chickens 2 per animalPigs, sow 60 per animal

Piglet 15 per animal

Apartments 15 - 20 per personAssembly halls 5~10 14 per person

Auditoriums 10 - 15 per personProduction 8

Pastry room 6Service 2~3Archive 1

Staff 2~3Baths 5~8 15

Barber Shops 15 - 25 per person

Banks

Bakeries

air change rateq

q

outside temperatureinside temperature

Total Cooling Load

Sensible heat

Type of Building and Room

Animals

Bars 15 - 25 per person

Beauty Shops 15 - 25 per personBoiler rooms 4

Bowling Alleys 15 - 20 per person

Cafeterias 4 10 - 15 per personCinemas/Theatres 5~10 7 - 15 per person

Sterile room 15Laboratory 15

Packing room 4Store 1

Churches 2 10 - 15 per person

Clubhouses 15 - 25 per person

Cocktail Lounges 15 - 25 per person

Computer Rooms 15 - 20 per person

Court Houses 10 - 15 per person

Dance halls 15 - 30 per personDental Clinics,

Offices 15 - 20 per personDepartment Stores

(cfm/Sq.Ft) 0.3

Dining Halls 10 - 15 per person

Drug Shop 10 - 15 per personEngine rooms 4Exhibition halls 10~20

Fire Stations 15 - 20 per personGarages 5~6 > 1

General 25 per personTherapy 9

Operating theatre 14Autopsy 9

Reception 15 - 20 per personRoom 3

Factory 20 - 30 per personCarpenter work

shop 2~5Car repair shop 4Car repair shop, exhaust outlet 60 - 80 per car

Mechanical work shop 3~4

Welding 12~15Assembly 4~5

Jails 10 - 15 per person

Jewelry Shop 10 - 15 per person

Libraries 10 - 15 per personLunch Rooms, Luncheonettes 10 - 15 per person

Industries

Chemist's shops

Hospitals

Hotels

Municipal Buildings 10 - 15 per person

Museums 10 - 15 per personSmithies 6~7

Small 20 - 40Large 10~20< 7 m2 15> 7 m2 20

Industrial in general 25 - 30

Gas ovens550/m2 outside

wall

Electric ovens300/m2 outside

wall

Grill table400/m2 outside

wallFrying pan 300

Boiling pan 100 l 100Boiling pan 200 l 200Coffee machine 60

Refrigerated cabinet 7~10

Cooling and freezer room 0.3 - 0.5

Store 2~4Laundries 10~15Lavatories 5~10 10

Night Clubs 15 - 25 per person

Malls 10 - 15 per person

Motels 15 - 20 per person

Module 3~8 15 - 20 per personLandscape 20 per person

Conference room 15 - 30 per person

Lecture room 10 - 15 per person

Dining hall 15 - 20 per personStaff, changing

clothes 8~12Dining room 8~10

Resting room 15 per person

Police Stations 15 - 20 per person

Post Offices 15 - 20 per personPrecision

Manufacturing 15 - 20 per person

Restaurants 5~10 10 15 - 20 per personRetail Stores (cfm/Sq.Ft) 0.3

Schools Classroom 4~5 10 - 15 per personShops 20 per person

Shopping Centers 10 - 15 per personSports halls 3~4

Supermarkets 10 - 15 per personSwimming pools 5~10

Kitchens

Offices

Taverns 15 - 25 per person

Town Halls 15 - 20 per person

Winter Condition

oF oCBars 64 18

Bathrooms 72 22Bedrooms 64 18

Changing rooms 72 22Churches 64 18

Cloakrooms 61 16Classrooms 68 20

Corridors 61 16Dining rooms 68 20

Dressing rooms 70 21Exhibition halls 64 18

Factories, sedentary work 64 18

Factories, light work 61 16Factories, heavy

work 55 13Gyms 59 15

Halls, assembly 64 18Halls, entrance 61 16

Hotel rooms 70 21Laboratories 68 20

Lecture rooms 68 20Libraries 68 20

Living rooms 70 21Museums 68 20

Offices 68 20Operating theatres 75 24

Prisons 64 18Recreation rooms 64 18

Restaurants 64 18Shops 64 18Stores 59 15

Swimming baths 81 27Waiting rooms 64 18

Wards 64 18Warehouses 61 16

Summer Condition

Outside dry bulbtemperature

oC oC max oC min %35 27 18.5 4432 26 18 4629 25 17.8 5227 24 17.5 5124 23 17.2 5721 22 17 57

Hl = 0.68 q dwLatent heat

1 dm3(litre)/s = 10-3 m3/s = 3.6 m3/h = 0.03532 ft3/s = 2.1189 ft3/min (cfm) = 13.200 Imp.gal (UK)/min = 15.852 gal (US)/min = 792 Imp. gal (UK)/h

Type of Heated rooms

TemperatureTable 2-Inside Temperature

Inside air conditions withdew point constant at 14oC

Table 3-Inside Temperature

whereHl = Latent heat(Btu/hr)q = air volume flow(cfm)

dw = humidity ratio difference(lb.water/lb dry air)= 70.00 (lb.water/lb dry air)= 50.00 (lb.water/lb dry air)

dw = 20.00 (lb.water/lb dry air)Therefore

Hl = 1,542.92 Btu/hr1Btu/hr = 0.293 Watt

Hl = 452.08 WattTherefore

Ht = Hs + HlHt = 9,874.72 Btu/hrHt = 2,893.29 Watt

2.89 KW

Pressure Loss for Heat Load

outside humidity ratioinside humidity ratio

Total Cooling Load