IL2 =
IL3 =
IL1 =
I2 + I2 + ( I1 X I2 ) 3 1
I2 + I2 + ( I2 X I3 ) 2 3
I2 + I2 + ( I1 X I3 ) 3 1
If the phase are unbalanced, each of the phase will differ from the others:
FORMULAE:
Product
Sensible Heat in BTU/hr. = lbs/hr. x Sp. Ht. x T
Latent Heat in BTU/hr.= lbs/hr. x Lt. Ht. in Btu/lb.
Heat of Resp. in BTU/hr . = lbs x Heat or Respiration in BTU/lb./hr.
All conversion factors used in standard calculations must be corrected for other than standard properties
Nomenclature
Q = Heat Flow in BTU/hr.
T = Temperature in ºF. ( T = temp. diff.) A = Area in Sq. Ft.
U = Coef. of Heat Transfer in BTU/hr./Sq.Ft./ºF. H = Total heat of air at wet bulb temp. BTU/lb.
H = Enthalpy difference between entering & leaving air SH = Specific humidity in grains of moisture/lb. of dry air
( SH = Specific humidity difference for entering and leaving air)
CFM = Cu. Ft./min. GPM = Gal/min.
3 Phase Delta Loads
3 0 Balanced Loads = P1 + P2 + P3
Total Line Current = Total Power (Balanced Load)
= BTU/hr.
Heat Transmission
Q Total = U x A Surface x T

Table 30.

Conversion Factors (constant)

Water

 

500 = 8.33 lbs./gal. x 60 min,

– (Converts GPM to lbs./hr.)

Air

 

4.5 = 60 min

– (Converts CFM to lbs./hr.)

 

13.35 Cu. Ft./lb.

 

1.08 = 4.5 x 0.241 BTU/lb./ºF.

– (lbs./hr. x Sp. Ht. of Air)

0.68 = 4.5 x 1054.3 BTU/lb.

 

 

7000 gr/lb.

– (4.5 combined with heat

 

 

 

of vaporization of water

 

 

 

at 70ºF. and grains per

 

 

 

pound of water)

Water Heating, Cooling & Heat Reclaim Coils, Water Chillers,

Condensers, etc.

 

Q = 500 x GPM x T

= BTU/hr.

T = Q

 

 

500 x GPM

 

 

For brines, Q = 500 x GPM x T x (Sp. Ht. x Sp. Gr. of Brine)

Properties of Water at 39.2 ºF.

Density of Water

= 62.4 lbs./Cu. Ft.

Specific Heat of Water

= 1 BTU/lb./ºF.

Latent Heat of

= 970 BTU/lb. at 212ºF. & Atm.

Vaporization

= 1054.3 BTU/lb. at 70ºF.

Specific Heat of Ice

= 0.5 BTU/lb./ºF.

Latent Heat of Fusion

= 144 BTU/lb.

1 Gallon of Water

= 8.33 lbs.

1 Pound of Water

= 7000 Grains

Air Coils

Q Sensible = 1.08 x CFM x T

= BTU/hr.

Q Latent = 0.68 x CFM x

SH

= BTU/hr.

Q Total = 4.5 x CFM x H

= BTU/hr.

 

lb./hr. Condensate

 

= 4.5 x CFM x SH Grains

 

 

7000 grains/lb

SHR Sensible Heat Ratio

= Q Sensible

 

 

Q Total

Table 31.

Single Phase Loads

Ohm’s Law for direct current

 

 

E

E

 

 

 

R

R

W

 

 

I2 X R

 

 

 

 

E

 

 

 

 

 

E X I

W

I

W

 

R

 

 

 

E2

R

E

I X R

 

W

 

 

 

 

 

 

 

E

 

W

 

 

I

 

I

 

 

W

W X R

 

 

 

I2

 

W = Watts

 

 

 

 

 

I

= Current (Amperes)

 

 

E = Electromotive Force (Volts)

 

R = Resistance (Ohms)

 

 

To obtain any values in the center circle, for Direct or Alternating Current, perform the operation indicated in one segment of the adjacent outer circle.

35

Page 34 Page 36
Page 35
Image 35
Heatcraft Refrigeration Products H-ENGM0408 Conversion Factors constant, Air Coils, = Watts, = Electromotive Force Volts
Page 34 Page 36

H-ENGM0408, H-ENGM0806 specifications

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In conclusion, Heatcraft's H-ENGM0806 and H-ENGM0408 models combine efficiency, flexibility, and advanced technology to provide reliable refrigeration solutions. Their thoughtful design and robust features make them ideal choices for businesses looking to maintain optimal temperature control while minimizing energy consumption and operational costs.
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