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REFRIGERATION LOAD ESTIMATE FORM 2

--> For Rooms below 0 degree C

Date 15-Mar-12 Estimated by

Customer: Address: Calculation chart:

DESIGN INFORMATION:

Application Outside Room Dimensions Insulation

Outside Ambient Temperature, oC: 10 Length (L) 4.6 m Type:Room Temperature, oC: -30 Width (W) 4 m Thickness, m 0.1

Temperature Difference, oC: 40 Height (H) 2.8 m

Overall Wall Thickness in meters : 0.2

(for single brick 0.1 m, double brick 0.3m plus insulation, NOTE: double brick wall equivalent to

0.025m of insulation)

Estimate Usage:

Product load, kg 1000 Miscellaneous Loads:

Number of people: 0 0 hrs in coolroom

Electrical Watts: 1200

Incoming temp., oC 10 Other, Watts:

Solution:

Outside Room Surface Area (A) Inside Room Volume (V)

LxW 18.40 m2

V = L' x W ' x H '

LxH 12.88 m2

V = 36 m3

WxH 11.20 m2

A =2xtotal 84.96 m2

Note: for L', W ', H ' use outside dimensions less

2 times overall wall thickness

1) Wall Load

a) Outside surface area (A) 84.96 m2

b) Wall 'U' Factor 0.32 W/m2K 'C' factor 0.032 W/m K

c) Temp. Difference across wall 40 KRefrigeration Load in kW 1.087 kW

2) Air Change Load

a) Inside Room Volume (V) 36 m3

b) Number Air Changes /24 hours 12 /24 hours

c) Heat removed/ m3

in cooling

from ambient to room temp. 74.5 kJ/m3

Refrigeration Load in kW 0.375 kW

3) Product Load

I) Cooling load to freezing temperature

a) Mass of product, kg 1000

b) Temp. Reduction to freezing, K 12 -2 Freezing temp., oCc) Spec. Heat above freezing, 3.1 kJ/kg K

Refrigeration Load in kW 0.431 kW

ii) Freezing Load at freezing temperature

a) Mass of product, kg 1000

b) LatentHeat of fusion 220 kJ/kg

Refrigeration Load in kW 2.546 kW

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iii) Cooling load below freezing temperature

a) Mass of product, kg 1000

b) Temp. Reduction below freezing, 28

c) Spec. Heat below freezing, 1.5 kJ/kg K

Refrigeration Load in kW 0.486 kW

4) Miscellaneous Loads

a) Electrical Watt 1.200 kWb) People 0.000 kW

c) Other 0.000 kW

5) Sum Of Loads = 1+2+3+4 = 6.126 kWAdd safety factor (10% of Sum) 0.613 kW

TOTAL LOAD = 6.739 kW

6) Required Refrigerating Power:

When compressor runs less than 24 hours/day

running hours per day 18

Note: 16 hrs for off cycle defrost

18 hrs for automatic defrost

Required Refrigerating Power: 8.985 kW

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ot 10

rt -30

TD 40

tw 0.2

PL 1000

it 10

l 4.6

w 4

h 2.8

18.4

12.88

11.2

OW 84.96

Wload

Ufact 0.32

Rload 1.087488

AloadV 36

Achange 12

Heat 74.5

Rload 0.38

Req'd Refrigerating Po

off cycle defrost hrs

automatic defrost hrs

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l1 4.2

w1 3.6

h1 2.4

36

PrLoad MiscLoad

Mass 1000

TR 12

SH 3.1

Rload 0.43

wer

16 0.000 kW

18 0.000 kW

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REFRIGERATION LOAD ESTIMATE FORM 1

--> For Rooms above 0 degree C

Date 15-Mar-12 Estimated by

Customer: Address: Calculation chart:

DESIGN INFORMATION:

Application Outside Room Dimensions InsulationOutside Ambient Temperature, oC: 35 Length (L) 6 m Type:

Room Temperature, oC: 2 Width (W) 6 m Thickness, m 0.05

Temperature Difference, oC: 33 Height (H) 3 m

Overall Wall Thickness in meters : 0.05

(for single brick 0.1 m, double brick 0.3m plus insulation, NOTE: double brick wall equivalent to

0.025m of insulation)

Estimate Usage:

Product load, kg 2000 Miscellaneous Loads:

Number of people: 0 0 hrs in coolroomElectrical Watts: 500

Incoming temp., oC 20 Other, Watts:

Solution:

Outside Room Surface Area (A) Inside Room Volume (V)

LxW 36.00 m2

V = L' x W ' x H '

LxH 18.00 m2

V = 101 m3

WxH 18.00 m2

A =2xtotal 144.00 m2

Note: for L', W ', H ' use outside dimensions less

2 times overall wall thickness

1) Wall Loada) Outside surface area (A) 144 m

2

b) Wall 'U' Factor 0.52 W/m2K 'C' factor 0.026 W/m K

c) Temp. Difference across wall 33 K

Refrigeration Load in kW 2.471 kW

2) Air Change Load

a) Inside Room Volume (V) 101 m3

b) Number Air Changes /24 hours 9.5 /24 hours

c) Heat removed/ m3

in cooling

from ambient to room temp. 93 kJ/m3

Refrigeration Load in kW 1.032 kW

3) Product Load

I) Cooling load to storage temperature

a) Mass of product, kg 2000

b) Temp. Reduction, K 18

c) Spec. Heat above freezing, 3.77 kJ/kg K

Refrigeration Load in kW 1.571 kW

ii) Heat of Respiration Load

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a) Mass of product, kg 2000

b) Heat of respiration / day 4.65 kJ/kg

Refrigeration Load in kW 0.108 kW

4) Miscellaneous Loads

a) Electrical Watt 0.500 kW

b) People 0.000 kWc) Other 0.000 kW

5) Sum Of Loads = 1+2+3+4 = 5.682 kW

Add safety factor (10% of Sum) 0.568 kW

TOTAL LOAD = 6.250 kW

6) Required Refrigerating Power:

When compressor runs less than 24 hours/day

running hours per day 16

Note: 16 hrs for off cycle defrost

18 hrs for automatic defrost

Required Refrigerating Power: 9.375 kW

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ot 35

rt 2

TD 33

tw 0.05

PL 2000

it 20

l 6

w 6

h 3

36

18

18

OW 144

Wload

Ufact 0.52

Rload 2.47104

Aload

V 101

Achange 9.5

Heat 93

Rload 1.03

Req'd Refrigerating Po

off cycle defrost hrs

automatic defrost hrs

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l1 5.9

w1 5.9

h1 2.9

101

PrLoad MiscLoad

Mass 2000 Elect 0.5

TR 18 People 0SH 3.77 Other

Rload 1.57 Rload 0.5

ResLoad

Mass 2000

Hresp/d 4.65

Rload 0.108

wer

16 0.000 kW

18 0.000 kW