Prediction of Oil Retention in Compressor Suction Lines with Refrigerant/Oil Mixture

doi:10.16183/j.cnki.jsjtu.2022.071

Abstract

Abstract:

At present, there is no method for predicting oil retention applicable to various working fluids. Oil retention characteristics in compressor suction lines are studied and a general method for predicting oil retention is established. The database of oil retention in suction lines is established according to experimental values in the public literature. After analyzing the influencing factors, a correlation of the volume ratio of oil retention in the database is fitted. According to the correlation and the state of working fluid at the inlet of suction line, the amount of oil retention can be predicted. In addition, oil retention of R32/PVE VG68 in suction lines is tested. A comparison of the experimental values and the prediction values indicate that for the flow of R32/PVE VG68 in suction lines, the calculation method can accurately show the variation trend of oil retention with various factors, and can accurately predict the amount of oil retention under different conditions.

Key words: refrigerant/oil mixture, compressor suction lines, prediction of oil retention

CLC Number:

TB61+1

ZHANG Zhiting, GU Bo, ZENG Weijie, HU Jinting, WU Pengzhan. Prediction of Oil Retention in Compressor Suction Lines with Refrigerant/Oil Mixture[J]. Journal of Shanghai Jiao Tong University, 2023, 57(8): 1028-1036.

Figures/Tables 13

Tab.1

Database of oil retention in suction lines from open literature

编号	文献	工质	D_i/mm	吸气管方向	G_tot/ (kg·m^-2·s^-1)	w_o,act/%	$ν ~$	数据点个数	最大不确定度
1	Cremaschi等^[15]	R22/MO	19.0	水平	160	0.8~6	32.02	23	12.00%
		R410A/POE	19.0	水平	160	0.8~6	37.46	23	12.00%
		R134a/PAG	19.0	水平	160	0.8~6	26.26	23	12.00%
		R134a/POE	19.0	水平	160	0.8~6	25.30	23	12.00%
2	Zoellick等^[16]	R410A/POE 32	7.1	水平、竖直	100~250	1, 3, 5	19.80	43	1.17% (0.03 g)
			18.5	水平、竖直	60~100	1, 3, 5	19.80	43	1.17% (0.03 g)
3	Budhiraja^[17]	R134a/AB32	10.2	水平、竖直	50~140	1, 3, 5	51.83	42	0.54% (0.03 g)
4	Ramakrishnan等^[18]	R134a/POE100	10.2	水平、竖直	30~120	1, 3, 5	28.31	34	(0.03 g)
5	Sethi等^[19]	R134a/POE32	10.2	水平、竖直	35~140	1, 3, 5	11.88	40	2.00%(0.08 g)
总计								182

Tab.1

Tab.2

Fig.1

Fig.2

Fig.3

Tab.3

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Fig.6

Tab.4

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Fig.9

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编号	作者	工质	压力/温度	ρ_o/ (kg·m^-3)	ρ_mix/ (kg·m^-3)	w_r,mix/ %	ν_mix/ (mm²·s^-1)	σ_o/ (mN²·m^-1)	σ_mix/ (mN²·m^-1)
1	Cremaschi等^[15]	R22/MO	p=550 kPa, t=24 ℃	862.0^b	888.1	10.56^a	19.00	33.0^a	31.7
		R410A/POE	p=550 kPa, t=24 ℃	985.3^b	990.8	7.63^b	28.55	46.0^a	44.4
		R134a/PAG	p=550 kPa, t=24 ℃	989.0^*	1 042.4	28.00^a	11.81	31.5^a	28.0
		R134a/POE	p=550 kPa, t=24 ℃	1008.0^b	1 044.7	21.00^a	11.37	46.0^a	41.8
2	Zoellick等^[16]	R410A/POE 32	t_sat=12 ℃, t=27 ℃	1 019.3	1 028.3	26.60	6.71	46.0^a	40.1
3	Budhiraja^[17]	R134a/AB32	t_sat=13 ℃, t=28 ℃	864.3	925.0	23.70	30.00	29.0	26.3
4	Ramakrishnan等^[18]	R134a/POE100	t_sat=13 ℃, t=28 ℃	970.7^b	1 003.6	17.50^b	16.27^b	46.0^*	42.5
5	Sethi等^[19]	R134a/POE32	t_sat=13 ℃, t=28 ℃	1 003.6^b	1 039.9	21.80^b	6.83^b	46.0^a	41.6

倾角/(°)	D_i/mm	管壁厚度/mm	L/m
90	10.7	1.0	0.525 0
45	10.7	1.0	1.100 0

传感器	所测参数	量程	精度
Pt100	流体的温度	0~100 ℃	±0.1 ℃
绝对压力传感器	流体的压力	0~1.5 MPa	±0.1%
科氏流量计	制冷剂的质量流量	0~180 kg/h	±0.1%
	油的质量流量	0~12 kg/h	±0.2%
电子称	样品的质量	0~6 000 g	±0.05 g