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Nanofluids Application as Nanolubricants in Heat Pumps Systems

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Nanofluids Application as Nanolubricants in Heat Pumps Systems ( nanofluids-application-as-nanolubricants-heat-pumps-systems )

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2170, Page 3 and visualized in real time through a LabVIEW 12.0 dedicated software, in order to allow the immediate control of the system; refrigerant and water properties were calculated by means of Refprop 9.0 (Lemmon et al., 2010). 2.4 Experimental procedure As first step, the rotary compressor (BEARS 39E073B), provided completely devoid of oil and internally cleaned, was filled with 180 cm3 of POE oil and connected to the circuit, previously put under vacuum. Then, the system was connected to the refrigerant cylinder (1,1,1,2-tetrafluoroethane, R134a) to permit the charge of about 500 g. At the end of each test, the system was evacuated and cleaned. Then the compressor was substituted with a new one, filled with the nanolubricant; all the system was put under vacuum and then charged with the refrigerant again. Figure 1. Experimental test rig. Figure 2. Employed sensors, as Pt100  thermoresistances (1), pressure transducers (2), Coriolis mass flow meter (4). Polycarbonate tube for visual inspection is also shown in the figure (3). Different positions (i – vi) for the acquisition of temperature and pressure. 2.4.1 Experimental conditions All the performed tests can be divided into three groups; different heat pump working conditions were in fact analysed. The boundary conditions had to be kept constant for the entire length of each test; the temperature and the flow rate of the water from the external thermostatic baths surrounding the heat exchangers were set in order to fix the evaporation and condensation temperatures. Depending on water conditions at the inlet of the evaporator and the condenser, the following three types of tests were performed: 15th International Refrigeration and Air Conditioning Conference at Purdue, July 14-17, 2014

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Nanofluids Application as Nanolubricants in Heat Pumps Systems

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