New method for measuring field performance of variable refrigerant flow systems based on compressor set energy conservation
| Autor: | Zhang Guohui, Wanlong Liu, Baolong Wang, Hansong Xiao, Yang Cao, Wenxing Shi, Xianting Li |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
020209 energy
Variable refrigerant flow Energy Engineering and Power Technology Separator (oil production) 02 engineering and technology Cooling capacity Industrial and Manufacturing Engineering Automotive engineering Sizing Energy conservation Pipeline transport Set (abstract data type) 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering Environmental science 0204 chemical engineering Gas compressor |
| Zdroj: | Applied Thermal Engineering. 154:530-539 |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2019.03.122 |
| Popis: | In recent years, variable refrigerant flow (VRF) systems have gained popularity in commercial and residential buildings. It is extremely significant to obtain the real performance of VRF systems in order to improve design. However, the measurement of the field cooling or heating capacity of air-cooled VRF systems has not yet been thoroughly addressed. In this paper, a novel field measurement method for the capacity of VRF systems is proposed based on the energy conservation of a compressor set. The compressor set consists of the actual compressor, oil separator, and capillary with the corresponding pipelines. The validation results indicate that the compressor set energy conservation method yields 15% accuracy for cooling capacity and 13% accuracy for heating capacity. Furthermore, the novel measurement method was applied to a VRF system in an office building over four weeks during the heating season. The field test results demonstrate that the average part-load ratio of the VRF system was 0.33, which revealed that the sizing of the VRF system was relatively excessive. |
| Databáze: | OpenAIRE |
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