Experimental study of the effects of the cycle characteristics on the refrigerant-induced noise in system air-conditioner

Abstract

The main sources of the refrigerant-induced noise can be classified 2 types according to its characteristics. One is due to the cyclic characteristics such as quality, velocity of the refrigerant, pressure drop and mass flow rate. The other is due to the structural characteristics such as distributed path pipe layout, distributor and expansion device. In this paper, the effects of cycle characteristics on the noise of multi-type system air-conditioner are investigated experimentally. In the indoor unit of multi-type air-conditioner, the variation of noise is examined when the in-flowing and out-flowing refrigerant to the indoor unit are 2-phase state according to its cycle control. And several factors are recommended in order to reduce the refrigerant-induced noise of the air-conditioner.

A fuzzy based decision support system for air conditioner selection and an application to Turkish construction sector

“…Air conditioning has rapidly grown over the past 50 years, from a luxury to a standard system included in almost every residential building [14,15]. The data illustrated in Tab.…”

An investigation of the influences of noise on EEG power bands and visual cognitive responses for human-oriented product design

“…Noise is a pervasive aspect of living and work environments, thanks to urbanization and industrialization, for examples, factory, traffic, car, airconditioner noise, etc. [2][3][4][5]. Particularly, low frequency noise, the frequency of which ranges below 100 Hz, is generated by many machines commonly used in the working environment, such as fans, blowers, compressors, and so on [6].…”

Evaluation of flow-induced noise, structure vibration, and flow morphology of R134a flowing through a thermostatic expansion valve

“…Bubbles behave as a non-linear oscillator, and their mathematical dynamic modeling can be quite complicated. Figure 2 illustrates geometrical boundary conditions adopted in the literature (MINNAERT, 1933;DEVIN, 1961;BLUE, 1967;JEONG;KIM, 2011) in the development of theoretical models for the natural frequency of bubbles. Source: Adapted by author from Minnaert (1933), Devin (1961), Blue (1967) and Han, Jeong and Kim (2011).…”

“…Figure 3 -Comparison of natural frequency predictive methods (DEVIN, 1961;MINNAERT, 1933;JEONG;KIM, 2011) and Han, Jeong and Kim (2011) experimental results. Source: Adapted from Han, Jeong and Kim (2011).…”

“…Figure 4 shows the comparison of the natural frequency predicted by methods (MIN-NAERT, 1933;BLUE, 1967;JEONG;KIM, 2011) from literature for the refrigerants R134a, R600a, R410a and R22. The capillary tubes are characterized by internal diameters ranging from 0.5 to 3 mm, therefore, according to the models proposed by Minnaert (1933) (Fig.…”