Question 3 (a) Compare geothermal and air-source heat pump systems for building air conditioning applications. (20%) (b)

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Question 3 A Compare Geothermal And Air Source Heat Pump Systems For Building Air Conditioning Applications 20 B 1 (150.61 KiB) Viewed 21 times

Question 3 (a) Compare geothermal and air-source heat pump systems for building air conditioning applications. (20%) (b) A commercial building is planning a groundwater heat pump system similar to the arrangement shown in Figure Q3. The peak cooling load for the building is 100 kW. The groundwater temperature is 15°C, and the HVAC engineer has designed the heat pump loop to float up to 30°C (heat pump inlet) before energizing the well pump. The building loop fluid is pure water, and the peak design flow requirement for the heat pump is 300L/min (5.0 kg/s). From the heat pump manufacturer's catalogue data, the COP of the heat pump at 30°C is 4.0. (1) Calculate the load on the heat exchanger. (20%) (i) Calculate the fluid temperature exiting the heat pump on building side. (20%) (ii) Calculate the required groundwater flow rate. (40%) Assumptions: The heat exchanger effectiveness & = 0.80. The specific heat of groundwater is 4.2 kJ/kg-K Minimum capacity rate (Cmin) is on the groundwater side. Heat Pump Circulation Pump Heat Exchanger Well water Pump Supply well Injection well Figure Q3. Schematic of a commercial/institutional ground heat pump system. Total marks for Question 3 = 100%