Heatcraft Refrigeration Products H-ENGM0408 manual Conversion Factors constant, Air Coils, = Watts

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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.

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Contents Engineering Manual Forward Table of ContentsOpenings and infiltration TablesWall heat loads Insulated block K factors Refrigeration Load Calculations Job SurveyDaily figure Safety FactorAir Change Load Product Load50ºF. rooms and higher with coil Temperature above 32ºF 20-22 hrHourly Heat Load Load Calculation FormsExample 35ºF Convenience Store Cooler With Glass Doors Example 35ºF Beef Cooler Inches Type Ceiling Walls Floor Example -20ºF Ice Cream Hardening Freezer Example -10ºF Beef Freezer Gallons of ice cream @ Overrun Allowance for Sun Effect Appendix TablesWall Heat Loads Effective K Factor in Block Thickness of InsulationRoom 40ºF .4ºC 50ºF ºC VolumeFor long storage multiply the above values by StorageNot based on maintaining nutritional value Storage requirements and properties of perishable productsMaple Sugar ºF. Other BTU / LB. / 24 Hrs Storage Temperature Degree F ProductHeat of Respiration Approx Heat equivalent of Occupancy Heat gain due to operation of battery operated lift truckBTU / 24 HR Heat equivalent of electric motorsRefrigeration requirements for hardening ice cream Banana Ripening RoomBanana Rooms Refrigeration Requirements Rapid load selection for back barsTemp State City Summer outside air and ground temperature design conditionsDesign Dry BulbEquipment Balance Temperature DifferenceProduct Safety/Capacity Control Refrigeration Equipment SelectionEffects of Altitude on Air Cooled Equipment Derating FactorsType of Operation/Air Flow Recommended Air Changes/HourGeneral Guidelines Left Cooler or freezer with glass display doors Right Unit Cooler Recommended Coil ReplacementLeft Large cooler or freezer Right 150 200 100 Line SizingRecommended Line Sizes for R-134a +30˚F21/8 Expansion Valve100 150 200 Recommended Line Sizes for R-22Equivalent Lengths 200 100 Receiver toRecommended Line Sizes for R-404A and R-507 30˚F 40˚F Recommended Line Sizes for R-404A and R-507Equivalent Feet of Pipe Due to Valve and Fitting Friction 134a R507 & R-404A Liquid Line Net Recommended Remote Condenser Line SizesRefrigerant Fahrenheit Fahrenheit Celsius Temperature Conversion ChartCelsius Fahrenheit Celsius= Watts Single Phase Loads Ohm’s Law for direct currentConversion Factors constant Air CoilsEnglish to Metric Conversion Factors English Conversion Factors & Data7000 Use of the Psychrometric ChartDefinitions SR/lb dry airCourtesy of Ashrae Reproduced by permission Appendix ChartsAtmospheric Pressure At other altitudeCourtesy of Ashrae Reproduced by permission Glossary of Refrigeration Terms Floor DimensionQuick Selection Guide Btuh Load +35 Room +30 RoomTips for Quick Selection Guide Rapid Load Calculator for Large Coolers and Freezers Heatcraft Refrigeration Products LLC

H-ENGM0408, H-ENGM0806 specifications

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