Cogeneration? EHP ?? ??

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Geothermal Heat Pump System (Ground Source Heat
Pump System)
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Specifications of the system components
Main circuit Component Specification
Ground coupling circuit Ground heat exchanger (1) Vertical-closed U-bend type Borehole diameter 150 mm Internal diameter of U-bends 42 mm Borehole depth 175 m, Material polyethylene
Ground coupling circuit Circulating pump Manufacturer Hyosung-Ebara. Co. Model ILP 100-250 Volumetric flow rate 45130 m3/h Power7.5kW, Speed 1750 rpm
Heat pump circuit (Manufacturer LG Electronics model LRW-N2900D) Heat exchanger Manufacturer SWEP Capacity 32.6 kW Type Plate heat exchanger
Heat pump circuit (Manufacturer LG Electronics model LRW-N2900D) Compressors Manufacturer Matsushida Type Rotary Refrigerant R-410A Inverter type 4.2 hp (3.1 kW) Fixed type 4.2 hp (3.1 kW)
Heat pump circuit (Manufacturer LG Electronics model LRW-N2900D) Indoor unit Manufacturer LG Electronics ModelLRD-N725T, Cooling capacity 7.2 kW Air flow rate 17 m3/min
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Summary of GSHP system

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Comparison with the conventional GSHP system
Water to Refrigerant
Water to water system

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Process of designing the ground heat exchanger

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(S/W Visual DOE)
(S/W GLD)
(S/W GLD)

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• -. ?? 128.7 kW
• -. ?? 56.0 kW

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Test apparatus for measuring thermal conductivity
of ground
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Schematics of GSHP system
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Subterranean temperature according to depth
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Relationships between principal temperatures
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Temperature of the circulating water
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Performance of GSHP system
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Comparison between GSHP and ASHP system
GSHP ASHP
Condenser Average circulating water temperature (?) 21.5 -
Condenser Outdoor air temperature (?) 32.7 35
Compressor Discharge pressure (kPa) 1620 2731
Compressor Suction pressure (kPa) 956 956
Cooling performance COPHP 8.3 3.91
Cooling performance COPoverall 5.9 3.37
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Simple p-h diagram of GSHP and ASHP system