User Inputs to the Freezer Model

In the simple inputs level, users can specify the number of freezers in their house, from zero to two units. Each freezer specified has default characteristics (appliance type, size and year) assigned depending on whether it is the first or second freezer in the house (Table 17). In the detailed inputs level, users can alter these default characteristics.


Table 16. Shipment Weighted Energy Factors for Freezers

Year

General

Upright Design

 

Chest Freezers

Automatic Defrost

Manual Defrost

1972

7.29

5.23

7.65

8.78

1973

7.72

5.43

7.93

9.27

1974

8.15

5.63

8.21

9.76

1975

8.58

5.83

8.49

10.25

1976

9.01

6.03

8.76

10.74

1977

9.44

6.23

9.03

11.23

1978

9.92

6.41

9.31

11.74

1979

10.39

6.95

9.84

11.77

1980

10.85

7.49

10.37

11.8

1981

11.13

8.03

10.89

11.82

1982

11.28

8.23

11.38

11.87

1983

11.36

8.43

11.44

11.91

1984

11.6

8.58

11.51

12.31

1985

11.55

9.5

11.56

12.04

1986

12.07

9.44

12.07

12.84

1987

12.93

9.57

12.6

14.41

1988

12.91

9.31

12.61

14.46

1989

13.89

9.47

13.86

15.48

1990

14.19

10.41

14.15

15.67

1991

14.17

10.43

13.95

15.92

1992

13.95

10.38

13.73

15.63

1993

17.38

13.65

17.3

19.43

1994

16.91

13.14

17.02

18.89

1995

16.57

13.16

16.95

18.28

1996

16.56

13.11

17.09

18.18

1997

16.41

12.99

16.94

18.02

1998

16.3

12.90

16.82

17.89

1999

16.16

12.79

16.68

17.74

2000

15.93

12.61

16.44

17.49

2001

17.38

13.76

17.94

19.08

2002

17.83

14.12

18.40

19.57

2003

17.06

13.51

17.61

18.73

Notes on Freezer Energy Factors:

1. Energy Factor has units of (cubic feet•day/kWh), where cubic feet is adjusted volume.

2. Source: (AHAM 1996) (AHAM 2003) - AHAM changed the reporting of freezer efficiencies after 1996. Annual data is available for the “General” category. Data for the other freezer types for years subsequent to 1996 was derived from the “General” freezer efficiency by scaling the efficiency for a particular type of freezer proportional to the annual change in efficiencies in the “General” freezer category.

3. Data has been held at 2003 levels for subsequent years.

 


Table 17. User Inputs to the Freezer Analysis

Variable Name

Range of possible Values

Default Value

unit

      Type

General

Upright, Automatic Defrost

Upright, Manual Defrost

Chest Freezer

General

 

      Year

1972-2011

1990 (1st unit)

1983 (2nd unit)

year

      Size

Small (13-15 cu ft)

Medium (16-18 cu ft)

Large (19-21 cu ft)

Extra-Large (22+ cu ft)

Medium (1st unit)

Small (2nd unit)

cu. feet

Comments