Bosch Geothermal Heat Pumps Applications Manual page 33

Applications Manual
Examining the part load speci cations for the Bosch
four (4) ton geothermal heat pump (Table 19) at 70°F
EFT (the typical shallow groundwater temperature for
the location is 67°F per Bosch Geo Solutions software),
we nd that at 75°Fdb, 63°Fwb the unit will produce
a total capacity of 37,650 Btu/h with 32,380 Btu/h
sensible capacity (86% of total capacity). This leaves
5,270 Btu/h latent capacity. During milder summer days,
this Bosch four (4) ton geothermal heat pump will run in
part load and still provide the necessary cooling needs
for the structure. 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
Capacity Data - Part Load
Entering Fluid Entering Air
Temp. (ÝF) Temp. (ÝF)
50
60
70Ýdb
70
61Ýwb
85
100
50
60
75Ýdb
70
63Ýwb
85
100
50
60
80Ýdb
70
67Ýwb
85
100
50
60
85Ýdb
70
71Ýwb
85
100
Tab. 19
(EFT Range (Standard) 50ÝF to 100ÝF)
Even with the installation location in Dallas, Texas, a
milder climate, the designer/installer should still examine
the heating ability of the unit closely.
Bosch Thermotechnology Corp.
Cooling - all performance at 1300 CFM and 12.0 GPM
Total Capacity Sensible Capacity
(MBtuH) (MBtuH)
37.65 28.42
36.39 27.70
35.12 27.08
33.23 26.30
31.34 25.67
40.35 33.98
39.00 33.12
37.65 32.38
35.62 31.45
33.59 30.71
44.30 37.52
42.81 36.57
41.33 35.76
39.11 34.73
36.89 33.91
48.24 41.10
46.63 40.06
45.02 39.16
42.60 38.05
40.19 37.15
Bosch Geothermal Heat Pumps | 33
Sensible to Power Input Heat of Reject
Total Ratio (kW) (MBtuH)
0.75 1.17
0.76 1.37
0.77 1.57
0.79 1.86
0.82 2.15
0.84 1.18
0.85 1.38
0.86 1.57
0.88 1.87
0.91 2.16
0.85 1.19
0.85 1.39
0.87 1.59
0.89 1.88
0.92 2.18
0.85 1.20
0.86 1.40
0.87 1.60
0.89 1.90
0.92 2.20
EER
41.65 32.1
41.06 26.6
40.47 22.4
39.58 17.9
38.69 14.6
44.37 34.2
43.69 28.3
43.02 23.9
42.00 19.1
40.98 15.5
48.35 37.3
47.55 30.9
46.74 26.1
45.54 20.8
44.33 16.9
52.32 40.3
51.40 33.4
50.47 28.2
49.08 22.5
47.69 18.3
Data subject to change