Bosch Geothermal Heat Pumps, Руководство по применению

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Applications Manual Bosch Geothermal Heat Pumps | 23
Bosch Thermotechnology Corp.
Data subject to change
Minneapolis, MN per the Bosch Geo Solutions software
program (see Table 5), the accumulated hours between
75ºF and 85ºF outdoor ambient is approximately 800.
Operating at part load during these temperatures will
improve humidity removal and still meet the structure heat
gain. If the outdoor temperature approaches the actual
cooling design temperature of 88°F, the Bosch three (3)
ton geothermal heat pump will shift to high cooling or full
load capacity to meet the structure cooling needs. At these
high outdoor ambient conditions, the Bosch three (3) ton
geothermal heat pump will meet approximately 97% of the
maximum limit, per ACCA Manual S.
Examining the part load speci cations (Table 4) for the
Bosch three (3) ton geothermal heat pump unit at 50°F
EFT (the typical shallow groundwater temperature for
the location is 47°F per Bosch Geo Solutions software),
we nd that at 75°Fdb, 63°Fwb Entering Air Temperature
(EAT) (return air temperature), the unit will produce a
total capacity of 27,940 Btu/h with 20,050 Btu/h sensible
capacity (72% of total capacity). This leaves 7,890 Btu/h
latent capacity.
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 59 40918 100% 2.12 20 17,746 0 0.00
92 50 39111 58 39111 100% 1.93 10 110,910 0 0.00
87 136 30222 57 30222 100% 1.20 152 301,677 0 0.00
82 285 21333 56 29944 71% 1.15 233 462,677 169,513 60.70
77 442 12444 54 30097 41% 1.13 206 405,859 574,589 205.76
72 613 3556 53 30250 12% 1.11 80 155,835 1,203,920 431.14
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 25188 10% 2.69 0.00 100 275,335 1,086,64 389.14
52 552 6420 49 24922 26% 2.66 0.00 243 660,510 563,941 201.95
47 478 10432 47 24656 42% 2.64 0.00 345 930.051 130,253 46.64
42 487 14444 46 24390 59% 2.61 0.00 492 1,080,268 0 0.00
37 552 18457 45 24124 77% 2.59 0.00 719 1,224,452 0 0.00
32 653 22469 44 23858 94% 2.57 0.00 1046 1,448,491 0 0.00
27 591 26481 43 26481 100% 2.54 0.00 1351 1,310,962 0 0.00
22 475 30494 42 30494 100% 2.52 0.00 886 1,053,650 0 0.00
17 379 34506 40 31597 100% 2.49 328.64 946 840,701 0 0.00
12 313 38519 39 31017 100% 2.48 669.78 775 694,300 0 0.00
7 242 42531 38 30554 100% 2.46 863.88 595 536,807 0 0.00
2 190 46543 37 30091 100% 2.44 931.71 464 421,460 0 0.00
-3 131 50556 36 29627 100% 2.43 817.15 318 290,585 0 0.00
-8 81 54568 35 29164 100% 2.41 613.31 195 179,675 0 0.00
-13 45 58580 33 28700 100% 2.39 400.76 108 99,819 0 0.00
-18 16 62593 32 28237 100% 2.38 163.84 38 35,491 0 0.00
Tab. 5
During milder summer days, this Bosch three (3) ton
geothermal heat pump will run at part load and still
provide the necessary cooling needs for the structure,
meeting the majority of the heat gain at moderate outdoor
temperatures as well as the latent load. This operation
mode will require less electrical power to operate and will
enhance latent heat removal (dehumidi cation), resulting
in improved indoor temperature and air quality conditions
As the installation location is to be Minneapolis,
Minnesota, a colder climate, the installer should examine
the heating ability of the unit closely.