Optimal fan speed and compression ratio of an air-condensed vapor-compression ammonia recycling system

Wei, Lu; Meng, Zhuo; Sun, Yize; Zhu, Helei

doi:10.1016/j.ijrefrig.2016.03.009

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…A fixed high condensing pressure can result in fan power saving (Yan et al, 2014) in a refrigeration system. However, Lu et al (2016) and Yu and Chan (2006) used variable speed condenser fans to change the process parameters in HVAC systems. Therefore, a PWM technique with the duty cycle was adopted to the two condenser fan motors of the outdoor units.…”

Section: Development Of Control Systemmentioning

confidence: 99%

Pulse-Width-Modulation Control of a Heat Pump Dryer with Cascade Evaporators and Parallel-Flow Condensers

et al. 2021

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Heat pump drying systems require a method to change the inflow air temperature of the drying chamber. Pulse-widthmodulation (PWM) technique with duty cycle provides a measure of controlling the voltage supplied to the electric motors. Therefore, we conducted this research to PWM control a heat pump dryer to change the air circuit parameters. In the Parallel-Flow condensers, inlet and outlet temperatures, and relative humidity, data were collected, and the average temperature values were recorded. The duty cycle was changed by developing a program using the Python programming language. An Excel-based psychrometric calculator was developed to analyze the collected data. The average condenser outlet temperatures were 56.6±0.1 ℃, 54.9±0.1 ℃, and 52.6±0.1℃, and the average condenser inlet temperatures were 43.2±0.0 ℃, 42.8±0.1 ℃, and 41.2±0.1 ℃ for 60%, 80%, and 100% duty cycles, respectively. The power consumption rate of the condenser reduced with an increasing duty cycle. The results concluded that the PWM control system is a viable method to control the inflow air temperature to the drying chamber.

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Section: Development Of Control Systemmentioning

confidence: 99%