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초록· 키워드

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An experimental study was performed to investigate characteristics of an inverter driven heat pump system with a variation of compressor frequency and expansion device. The compressor frequency varied from 30㎐ to 75㎐, and the performance of the system applying three different expansion devices such as capillary tube, thermostatic expansion valve(TXV), and electronic expansion valve(EEV) was measured. The load conditions were altered by varying the temperatures of the secondary fluid entering condenser and evaporator with a constant flow rate. When the test condition was deviated from the standard value(rated value), TXV and EEV showed better performance than capillary tube due to optimal control of mass flow rate and superheat. In the present study, it was observed that the variable area expansion device had better performance than constant area expansion device in the inverter heat pump system due to active control of flow area with a change of compressor frequency and load conditions.

목차

Abstract

1. Introduction

2. Experimental Setup

3. Results and Discussion

4. Conclusions

Acknowledgements

References

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UCI(KEPA) : I410-ECN-0101-2009-553-015265000