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Figure 2 (a) System schematic of the test bench (b)Test bench at CanmetENERGY • Optimum high pressure is controled by the expansion valve installed after the IHE on the high pressure level. Several tests were performed to correlate the following control fuction giving the optimum pressure (Popt) in kPa as a function of gas cooler outlet temperature (Tgc,out) in °C. Popt (Tgc,CO2 )=149.7×Tgc,out +2588.4 (3) • Expansion valves’ opening changes automatically to be able to provide superheat temperature set point (1.5 °C) at the borehole exit. • Two valves installed at the low pressure level before the IHE satisfy the second superheat set point (5.0 °C) at the compressor suction by modulating the flow of CO2 passing through the IHX. Measurements and uncertainty Uncertainties of measuring equipments are presented in Table 4. The uncertainty of temperature measurement can go upto ±0.8 °C (for measuring high temperatures) due to the use of pipe surface thermocouples. Temperature uncertainties due to heat losses from pipe surface to the ambient and the thermal contact resistance between the thermocouples and the pipe surface is not taken into account. Table 4. Measurement uncertainties Measured parameters Temperature CO2 mass flow rate Water mass flow rate Pressure Power input to the compressor Equipment T-type thermocouples Coriolis flowmeter Magnetic flowmeter Transducers Wattmeter Uncertainty ±0.5 °C ±0.2% ±0.5% ±0.6% ±0.2%PDF Image | Direct expansion ground source heat pump using R744
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