Bosch Geothermal Heat Pumps, Applications Manual

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2 8 | Bosch Geothermal Heat Pumps
Bosch Thermotechnology Corp. Data subject to change
Applications Manual
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
(F)
Bin
Hrs
Bldg Load
(Btuh)
EWT
(F)
HPCap
(Btuh)
Run
Time
Pwr
(kW)
Auxillary
(kWh)
HP
(kWh)
Geo HW
(Btuh/yr)
Aux HW
(Btuh/yr)
Aux HW
(kWh
97 8 48000 57 48000 100% 2.01 8 17,746 0 0.00
92 50 39111 56 43370 90% 1.56 70 110,910 0 0.00
87 136 30222 55 43516 69% 1.54 146 301,677 0 0.00
82 285 21333 54 43662 49% 1.52 212 445,674 186,516 66.79
77 442 12444 53 43809 28% 1.50 188 393,182 587,266 210.30
72 613 3556 52 43955 8% 1.48 73 151,859 1,207,900 432.56
67 701 0 52 0 0 1,554,960 556.85
62 704 0 51 0 0 1,561,620 559.23
57 614 2407 50 33957 7% 3.26 0.00 96 295,558 1,066,420 381.89
52 552 6420 49 33571 19% 3.25 0.00 233 710,570 513,882 184.03
47 478 10432 47 33185 31% 3.24 0.00 330 1,002,765 57,540 20.61
42 487 14444 46 32799 44% 3.23 0.00 470 1,080,268 0 0.00
37 552 18457 45 32413 57% 3.22 0.00 688 1,224,452 0 0.00
32 653 22469 44 32027 70% 3.21 0.00 1000 1,448,491 0 0.00
27 591 26481 43 31641 84% 3.20 0.00 1077 1,310,962 0 0.00
22 475 30494 42 31255 98% 3.19 0.00 1007 1,053,650 0 0.00
17 379 34506 40 34506 100% 3.18 0.00 1069 840,701 0 0.00
12 313 38519 39 38519 100% 3.17 0.00 742 694,300 0 0.00
7 242 42531 38 40133 100% 3.16 173.94 764 536,807 0 0.00
2 190 46543 37 39662 100% 3.14 391.86 598 421,460 0 0.00
-3 131 50556 36 39192 100% 3.13 446.19 410 290,585 0 0.00
-8 81 54568 35 38722 100% 3.12 384.73 253 179,675 0 0.00
-13 45 58580 33 38251 100% 3.11 274.20 140 99,819 0 0.00
-18 16 62593 32 37781 100% 3.10 118.99 50 35,491 0 0.00
Tab. 13
Capacity Data - Full Load Heating
Entering
Fluid Temp.
(F)
Entering
Air Temp.
(F)
Total
Capacity
(MBtuH)
Power
Input
(kW)
Heat of
Abs.
(MBtuH)
COP
50
60
48.44 2.96 38.32 4.8
60 52.79 3.05 42.38 5.1
70 57.15 3.14 46.43 5.3
80 61.50 3.23 50.48 5.6
50
70
45.81 3.02 35.52 4.5
60 49.92 3.11 39.32 4.7
70 54.04 3.20 43.13 5.0
80 58.15 3.29 46.94 5.2
50
80
42.72 3.08 32.21 4.1
60 46.55 3.17 35.73 4.3
70 50.39 3.26 39.25 4.5
80 54.22 3.36 42.76 4.7
Tab. 12
(EFT Range (Standard) 25F to 80F)