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4 – Test Rig Design and Experimental Methods The signals from the sensors/instruments were continuously processed and logged by an advanced Satchwell data acquisition system, consisting of a Satchwell UNC596 Outstation (hardware) and BAS 2800+ software. Selected measurement data from the Outstation were processed, analysed and displayed by means of tailor-made Excel spreadsheets. In the Excel calculations, the thermophysical properties of CO2 were supplied by the library xlco2lib.dll (Skaugen 2002), where the data are based on corre- lations from Span and Wagner (1996). The thermodynamic properties of water and potassium formate (Hycool) were based on data from the VDI Heat Atlas (1993) and Melinder (2000), respectively. The absolute and relative uncertainties of the readings from the sensors/- instruments and for the computed values are shown in Table 4.11 in Section 4.1.4.5 and in Tables 4.12 to 4.16 in Section 4.1.4.6, respectively. 4.1.4.1 Temperature Selected temperatures in the four sub-systems were measured with cali- brated platinum resistance (Pt1000) sensors from Kundo, since the Satch- well Outstation was not capable of processing low voltage signals from thermocouples. Table 4.8 shows an overview of the temperature measure- ments in the four sub-systems. The tag no. xTy, refers to the number of the sub-system x (Sections 4.1.2 and 4.1.3) and the number of the sensor y. The measurements from the Pt1000 sensors in the heat source, hot water the space heating systems were used when calculating the heating capacity of the tripartite gas cooler and the COP of the heat pump unit. In order to measure the bulk temperature, the sensors were placed in specially designed metal pockets that were installed vertically inside the tubes. The sensors that were used to measure temperature differences, were cali- brated both individually and as pairs since this improved the accuracy of the measurements. The temperature measurements from the CO2 heat pump unit were used for system and component analysis. Due to the relatively large diameter of the Pt1000 sensors (5 mm), they had to be installed at the outside of the OD 8 and 10 mm CO2 tubes. Each sensor was mounted by means of plastic strips, thermal mass and aluminium tape. In order to achieve iso- thermal conditions for the sensor, about 10 cm of the wire was clamped to the tube and insulated with 12 mm Armaflex. 89PDF Image | Residential CO2 Heat Pump System for Combined
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