Development of a virtual variable-speed compressor power sensor for variable refrigerant flow air conditioning system |
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| Affiliation: | 1. Department of Refrigeration & Cryogenics, Huazhong University of Science and Technology, Wuhan, China;2. Department of Building Environment and Energy Application Engineering, Wuhan Business University, 816 Dongfeng Avenue, Wuhan, Hubei, 430056, China;3. Durham School of Architectural Engineering and Construction College of Engineering, University of Nebraska-Lincoln, Omaha, NE, USA;4. State Key Laboratory of Compressor Technology, Hefei, China;1. Department of Refrigerant and Cryogenics Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430074, China;3. State Key Laboratory of Compressor Technology (Anhui Laboratory of Compressor Technology), Hefei, Anhui 230031, China |
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| Abstract: | This paper proposed a universal virtual variable-speed compressor power (VVCP) sensor for VRF system based on 20-coefficient model. Compressor power can be obtained by the VVCP sensor using three input parameters (frequency, condensing temperature and evaporation temperature) which are measured by system itself. The performance of the proposed VVCP sensor is evaluated using experiments data. Experimental conditions include cooling, heating and non-standard refrigerant charge levels. The result shows that the mean square percentage errors (MSPE) are 9.9% under cooling conditions and 7.96% under heating conditions. The MSPE are 9.88% at steady state and 9.75% at dynamic state when the VVCP sensor is applied under nine different refrigerant charge levels. It demonstrated that the proposed VVCP sensor can obtain compressor power under cooling, heating and non-standard refrigerant charge levels, which could be applied to do operational monitoring and fault detection and diagnosis for VRF system at low cost. |
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