Heatcraft Refrigeration Products Heatcraft Engineering Manual: Comprehensive Guide for Efficient Refrigeration Systems

Page 42

Tips for Quick Selection Guide

Walk- In Cooler Box Load Parameter

1.95ºF. ambient air temperature surrounding box.

2.4” Styrene (R=16.7, K=0.24) walls/ceilling, 6” concrete slab floor.

3.Average product load with 5ºF. pull down in 24 hours.

4.BTUH load based on 16-18 hour compressor run time for 35ºF. box (timer recommended) +20 hours for 30ºF. box.

5.See Table C for adjustment to box load for glass doors.

6.For 80ºF. ambient temp. surrounding box, deduct 12%.

7. For 4” Urethane walls+ceiling, 6” concrete slab floor deduct 12%.

8.For 10’ ceiling height add 10%.

9.For additional BTUH load for product cooling see Table A.

Walk-In Freezer Box Load Parameters

1.95ºF. ambient air temperature surrounding box.

2.4” Urethane (R=25, K=0.16) walls, ceiling + floor.

3.Average product load with 10 degree pull down in 24 hours.

4.BTUH load based on 18 hour compressor run time.

5.See Table C for adjustment to box load for glass doors.

6.For 80ºF. ambient air temp. surrounding box, deduct 12%.

7.For 20 hour compressor run time (light frost load) in lieu of 18 hour run time, deduct 11%

8.For 10’ ceiling height add 10%

9.For additional BTUH load for product freezing, refer to Table D

Table A

Product Cooling Loads for Walk-In Coolers

(24 hour pull down/18 hour compressor operation) 24% safety factor added to loads to allow for service.

 

Specific Heat

 

10 Degree Pull down BTUH Load for Indicated

 

 

Product

Above

 

lbs of Product per 24 Hours

 

 

 

 

 

Freezing

500

1000

1500

 

2000

 

3000

5000

Beef

0.72

240

480

720

 

960

 

1440

2400

Pork

0.53

177

353

530

 

706

 

1060

1767

Veal & Lamb

0.76

253

506

760

 

1012

 

1520

2533

Poultry

0.79

263

526

790

 

1053

 

1580

2633

Seafood

0.80

267

533

800

 

1066

 

1600

2667

Vegetables

0.92

307

613

920

 

1226

 

1840

3067

Bakery Food

0.74

247

494

740

 

988

 

1480

2467

Beer

1

333

666

1000

 

1333

 

2000

3333

 

 

 

 

 

 

 

 

 

 

For product pull down greater than 10 degrees, divide pull down temperature by 10. Multiply this number by the BTUH shown on Table A, then add to Box Load

Table B

 

 

 

 

Meat Cutting/Prep Room Load

(BTU/HR/SQ FT of floor area)

 

 

 

 

Floor

Approx. 65% R.H.

 

Room Temp.

 

 

SQ FT

 

 

55ºF.

 

50ºF.

Room Loads based on continuous

 

 

100

93

 

105

operation and includes allowance

200

88

 

99

for average number of personnel,

300

85

 

95

processing equipment, etc., with

400

81

 

90

glass panel in one wall and walls

500

78

 

87

and ceiling insulated with 3” of

600

75

 

85

styrene with box located in air

700

72

 

81

conditioned area. Evaporator

800

69

 

78

should be low outlet velocity type

900

67

 

75

to avoid drafts and should be

1000

65

 

73

selected for continuous operation

1200

62

 

69

and not less than 30ºF. evap. temp.

Table C

Glass Door Loads

Box

BTU per

Temperature

Door

+35

1060

+30

960

0

1730

-10

1730

-20

1730

*Adjusted for 16-18 hour run time. Multiply number of doors times door load above and add to box load.

Table D

Product Freezing Loads for Walk-In Freezers

 

Spec. Heat

 

Latent

Freezer

 

 

 

 

 

 

Product

BTU/lb/Deg. F.Heat

Temp.

-10ºF. Freezer Temperature BTUH for Indicated lbs. Prod/Day

 

 

 

32 +

 

32 -

BTU/lb.

(F)

100

300

750

1000

1500

3000

Beef

0.72

 

0.40

95

29

790

2370

5925

7900

11850

23700

Pork

0.53

 

0.32

60

28

523

1571

3926

5235

7853

15710

Veal & Lamb

0.76

 

0.45

100

28

841

2524

6311

8414

12621

25240

Poultry

0.79

 

0.42

106

27

878

2636

6590

8787

13181

26360

Seafood

0.80

 

0.43

110

28

906

2719

6797

9063

13595

27190

Vegetables

0.92

 

0.47

130

30

1053

3159

7898

10530

15795

31590

Bakery Foods

0.74

 

0.34

53

20

520

1560

3900

5200

7800

15600

 

 

 

 

 

 

 

 

 

 

 

 

Freezing loads based on product entering at 40ºF. maximum. For a specific pull down time, the product load BTU/hr. may be adjusted by multiplying the above loads by 24 and dividing by

the specific pull down time in hours. To adjust for 0ºF. freezer temperature, multiply the above loads by 0.97, and for -20ºF. freezer, multiply by 1.04.

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Contents Engineering Manual Table of Contents ForwardTables Wall heat loads Insulated block K factorsOpenings and infiltration Job Survey Refrigeration Load CalculationsProduct Load Safety FactorAir Change Load Daily figureLoad Calculation Forms Temperature above 32ºF 20-22 hrHourly Heat Load 50ºF. rooms and higher with coilExample 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 Effective K Factor in Block Thickness of Insulation Appendix TablesWall Heat Loads Allowance for Sun EffectStorage VolumeFor long storage multiply the above values by Room 40ºF .4ºC 50ºF ºCStorage requirements and properties of perishable products Not based on maintaining nutritional valueMaple Sugar BTU / LB. / 24 Hrs Storage Temperature Degree F Product Heat of Respiration ApproxºF. Other Heat equivalent of electric motors Heat gain due to operation of battery operated lift truckBTU / 24 HR Heat equivalent of OccupancyRapid load selection for back bars Banana Ripening RoomBanana Rooms Refrigeration Requirements Refrigeration requirements for hardening ice creamDry Bulb Summer outside air and ground temperature design conditionsDesign Temp State CityRefrigeration Equipment Selection Temperature DifferenceProduct Safety/Capacity Control Equipment BalanceRecommended Air Changes/Hour Derating FactorsType of Operation/Air Flow Effects of Altitude on Air Cooled EquipmentGeneral Guidelines Unit Cooler Recommended Coil Replacement Left Large cooler or freezer RightLeft Cooler or freezer with glass display doors Right +30˚F Line SizingRecommended Line Sizes for R-134a 150 200 100Expansion Valve 21/8Recommended Line Sizes for R-22 Equivalent Lengths100 150 200 Receiver to 200 100Recommended Line Sizes for R-404A and R-507 Recommended Line Sizes for R-404A and R-507 30˚F 40˚FEquivalent Feet of Pipe Due to Valve and Fitting Friction Recommended Remote Condenser Line Sizes 134a R507 & R-404A Liquid Line NetRefrigerant Fahrenheit Celsius Fahrenheit Celsius Temperature Conversion ChartCelsius FahrenheitAir Coils Single Phase Loads Ohm’s Law for direct currentConversion Factors constant = WattsEnglish Conversion Factors & Data English to Metric Conversion FactorsSR/lb dry air Use of the Psychrometric ChartDefinitions 7000At other altitude Appendix ChartsAtmospheric Pressure Courtesy of Ashrae Reproduced by permissionCourtesy of Ashrae Reproduced by permission Glossary of Refrigeration Terms Btuh Load +35 Room +30 Room DimensionQuick Selection Guide FloorTips for Quick Selection Guide Rapid Load Calculator for Large Coolers and Freezers Heatcraft Refrigeration Products LLC

H-ENGM0408, H-ENGM0806 specifications

Heatcraft Refrigeration Products offers a diverse range of commercial refrigeration solutions designed to meet various operational needs. Among their notable offerings are the H-ENGM0806 and H-ENGM0408 models, which stand out for their efficiency and innovative features.

The H-ENGM0806 model boasts a robust construction and high-performance capabilities, making it ideal for large-scale refrigeration requirements. This model is engineered with an advanced compressor that provides powerful cooling while maintaining energy efficiency. The unit operates at low sound levels, making it suitable for environments where noise reduction is essential, such as restaurants and grocery stores. Additionally, the H-ENGM0806 incorporates a reliable fan system designed to ensure optimal air circulation, promoting even cooling throughout the refrigerated space.

Meanwhile, the H-ENGM0408 model is designed for medium-sized applications that require flexibility without compromising on performance. This unit features a compact design, making it an excellent choice for businesses with limited space. Its energy-efficient compressor reduces operational costs, and its user-friendly digital controls allow for easy temperature adjustments and monitoring. The H-ENGM0408 is engineered to operate in various ambient conditions, ensuring reliability and consistent performance regardless of the environment.

Both models feature a state-of-the-art microprocessor control system that allows for precise temperature management. These systems not only optimize performance but also enhance the longevity of the refrigeration units. The H-ENGM0806 and H-ENGM0408 come with a robust evaporator coil design, facilitating rapid cooling and reducing the downtime associated with equipment maintenance.

In terms of durability, both products are constructed with high-quality materials resistant to corrosion and wear, making them suitable for demanding commercial environments. Additionally, they comply with industry standards and regulations, ensuring safety and reliability in operation.

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.