Bosch Geothermal Heat Pumps Applications Manual page 34

3 4 | Bosch Geothermal Heat Pumps
Examining the corresponding full load heating data (Table
20) for the Bosch four (4) ton geothermal heat pump
(compressor operating at 100% full load ability), we
nd that at 70°F EFT (the typical shallow groundwater
temperature for the location is 67°F per Bosch Geo
Solutions software) and 70°F entering air temperature
(return air temperature), we determine the total capacity
for heating is 54,040 Btu/h. Our calculated heat loss
at design conditions is 35,000 Btu/h at 24°F outdoor
temperature. We will be able to meet over 100% of the
structure heat loss with the Bosch four (4) ton geothermal
heat pump capacity at design conditions. Examining the
actual bin hours for Dallas, TX using the Bosch four (4)
ton geothermal heat pump (see Figure 34), we nd that
the heat pump providing compressor heating will operate
until the structure balance point of approximately 7°F
outdoor temperature without auxiliary heating typically
being required. It is unlikely that this application even
needs supplemental heat, but the installer should still
install electric heaters for use as emergency heat if the
compressor fails during winter months. The heater size
should be at least 10kW for this application.
Capacity Data - Full Load Heating
Entering Entering Total
Fluid Temp. Air Temp. Capacity
(ÝF) (ÝF) (MBtuH)
50 48.44
60 52.79
60
70 57.15
80 61.50
50 45.81
60 49.92
70
70 54.04
80 58.15
50 42.72
60 46.55
80
70 50.39
80 54.22
Tab. 20
(EFT Range (Standard) 25ÝF to 80ÝF)
Data subject to change
Power Heat of
Input Abs. COP
(kW) (MBtuH)
2.96 38.32 4.8
3.05 42.38 5.1
3.14 46.43 5.3
3.23 50.48 5.6
3.02 35.52 4.5
3.11 39.32 4.7
3.20 43.13 5.0
3.29 46.94 5.2
3.08 32.21 4.1
3.17 35.73 4.3
3.26 39.25 4.5
3.36 42.76 4.7
Applications Manual
Bosch Thermotechnology Corp.