Bosch Geothermal Heat Pumps Applications Manual page 28

2 8 | Bosch Geothermal Heat Pumps
As the installation location is to be Minneapolis,
Minnesota, a colder climate, the designer should examine
the heating ability of the unit more closely.
Examining the corresponding full load heating data (Table
12) for the Bosch four (4) ton geothermal heat pump
(compressor operating at 100% full load ability), we
nd that at 50°F EFT (the typical shallow groundwater
temperature for the location is 47°F per Bosch Geo
Solutions software) and 70°F entering air temperature
(return air temperature), we determine the total capacity
for heating is 45,810 Btu/h. Our calculated heat loss
at design conditions is 65,000 Btu/h at -11°F outdoor
temperature. We will be able to meet approximately 70%
of the structure heat loss with the Bosch four (4) ton
geothermal heat pump capacity at design conditions.
Examining the actual bin hours for Minneapolis, MN using
the Bosch four (4) ton geothermal heat pump (see Table
13), we nd that the heat pump providing compressor
heating will operate until the structure balance point of
approximately 10°F outdoor temperature without auxiliary
heating typically being required.
Bosch Geo Solutions Software Data
Bin Bin Bldg Load
(ÝF) Hrs (Btuh)
97 8 48000
92 50 39111
87 136 30222
82 285 21333
77 442 12444
72 613 3556
67 701 0
62 704 0
57 614 2407
52 552 6420
47 478 10432
42 487 14444
37 552 18457
32 653 22469
27 591 26481
22 475 30494
17 379 34506
12 313 38519
7 242 42531
2 190 46543
-3 131 50556
-8 81 54568
-13 45 58580
-18 16 62593
Tab. 13
Data subject to change
EWT HPCap Run
(ÝF) (Btuh) Time
57 48000 100%
56 43370 90%
55 43516 69%
54 43662 49%
53 43809 28%
52 43955 8%
52 0
51 0
50 33957 7%
49 33571 19%
47 33185 31%
46 32799 44%
45 32413 57%
44 32027 70%
43 31641 84%
42 31255 98%
40 34506 100%
39 38519 100%
38 40133 100%
37 39662 100%
36 39192 100%
35 38722 100%
33 38251 100%
32 37781 100%
Capacity Data - Full Load Heating
Entering Entering
Fluid Temp. Air Temp.
(ÝF) (ÝF)
50
60
60
70
80
50
60
70
70
80
50
60
80
70
80
Tab. 12
(EFT Range (Standard) 25ÝF to 80ÝF)
Pwr Auxillary HP
(kW) (kWh) (kWh)
2.01 8
1.56 70
1.54 146
1.52 212
1.50 188
1.48 73
0
0
3.26 0.00 96
3.25 0.00 233
3.24 0.00 330
3.23 0.00 470
3.22 0.00 688
3.21 0.00 1000
3.20 0.00 1077
3.19 0.00 1007
3.18 0.00 1069
3.17 0.00 742
3.16 173.94 764
3.14 391.86 598
3.13 446.19 410
3.12 384.73 253
3.11 274.20 140
3.10 118.99 50
Applications Manual
Total Power Heat of
Capacity Input Abs.
(MBtuH) (kW) (MBtuH)
48.44 2.96 38.32
52.79 3.05 42.38
57.15 3.14 46.43
61.50 3.23 50.48
45.81 3.02 35.52
49.92 3.11 39.32
54.04 3.20 43.13
58.15 3.29 46.94
42.72 3.08 32.21
46.55 3.17 35.73
50.39 3.26 39.25
54.22 3.36 42.76
Geo HW Aux HW
(Btuh/yr) (Btuh/yr)
17,746 0
110,910 0
301,677 0
445,674 186,516
393,182 587,266
151,859 1,207,900
1,554,960
1,561,620
295,558 1,066,420
710,570 513,882
1,002,765 57,540
1,080,268 0
1,224,452 0
1,448,491 0
1,310,962 0
1,053,650 0
840,701 0
694,300 0
536,807 0
421,460 0
290,585 0
179,675 0
99,819 0
35,491 0
Bosch Thermotechnology Corp.
COP
4.8
5.1
5.3
5.6
4.5
4.7
5.0
5.2
4.1
4.3
4.5
4.7
Aux HW
(kWh
0.00
0.00
0.00
66.79
210.30
432.56
556.85
559.23
381.89
184.03
20.61
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00