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자료유형
학술저널
저자정보
저널정보
대한설비공학회 International Journal of Air-Conditioning and Refrigeration Journal Of Air-Conditioning and Refrigeration Vol.10 No.2
발행연도
2002.6
수록면
106 - 115 (10page)

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The performance of an inverter-driven water-to-water heat pump with an electronic expansion valve(EEV) was measured as a function of compressor frequency, load conditions, and EEV opening. Based on the test results, a controller using proportional integral (PI) feedback or PI feed forward algorithm was designed and tested to investigate capacity modulation and transient response control of the system. Although the relation between superheat and EEV opening of the heat pump showed nonlinear characteristics, a control gain obtained at the rated frequency was applicable to various operating conditions without causing large deviations. When the simple PI feedback control algorithm was applied, a large overshoot of superheat and wet compression were observed due to time delay effects of compressor frequency. However, applying PI feed forward control scheme yielded better system performance and higher reliability, compared to the PI feedback algorithm.

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Abstract

1. Introduction

2. Test setup and procedure

3. Control system

4. Results and discussion

5. Conclusions

Acknowledgements

References

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