Performance of a scroll compressor with vapor-injection and two-stage reciprocating compressor operating under extreme conditions

Abstract

ElsevierTello Oquendo, FM.; Navarro-Peris, E.; Gonzálvez Maciá, J.; Corberán Salvador, JM. (2016). Performance of a scroll compressor with vapor-injection and two-stage reciprocating compressor operating under extreme conditions. ABSTRACTThe current paper presents a comparative study between a vapor-injection scroll compressor (SCVI) and a two-stage reciprocating compressor (TSRC) operating under extreme conditions. The present work is divided into two parts: on the first one, both compressors are compared in terms of compressor efficiency, volumetric efficiency, COP, and cooling capacity using R407C refrigerant; on the second part, the seasonal performances of both compressors working in cooling and heating modes are estimated and analyzed. As a result, the SCVI presents better efficiency and COP, compared to TSRC, for pressure ratios below 7.5. This compressor can be used in air conditioning systems and heat pumps, which work under moderate temperature conditions. For higher pressure ratios, the TSRC has better efficiency which subsequently gives higher system COP. This type of compressors can be used in domestic hot water systems operating under severe climates and low temperature freezing systems (under -20°C).

Performance Analysis of High-temperature Two-stage Compression Heat Pump with Vapor Injection Dynamic Control

“…Lee et al (12) discovered that COP h of a heat pump with vapor injection gradually decreases with increasing compression ratio under a high compression ratio. Oquendo et al (13) compared the performance of vapor injection refrigeration systems with a vapor injection scroll compressor and a vapor injection two-stage reciprocating compressor. They found that if the compression rate of the compressor is lower than 7.5, the compression efficiency and volume efficiency of the vapor injection scroll compressor are higher than those of the vapor injection reciprocating compressor.…”

Performance analysis of single-stage air source heat pump utilizing indirect vapor injection design

“…They concluded that the cooling energy efficiency ratio (EER) of an optimized enhanced vapor injection system can be close to 4% and the cooling capacity can be 4% bigger than that of a single-stage system. Oquendo et al 15 have compared the performance of a scroll compressor with vapor injection and two-stage reciprocating compressor, it is found that the scroll compressor with vapor injection presents better efficiency when working with pressure ratios below 7.5 approximately and also at moderate evaporating temperature conditions, and the scroll compressor with vapor injection develops higher cooling COP and capacity. Lee et al 16 mentioned the sub-cooling for liquid injection as a proper parameter to control the injection for the reliable operation in the liquid injection case.…”

Intelligent High-performance Dynamic Control for Two-stage Screw High-temperature Heat Pump System

“…Oquendo et al (20) compared the performances of a scroll compressor with vapor injection and a two-stage reciprocating compressor. It was found that the scroll compressor with vapor injection has better efficiency when working with pressure ratios below approximately 7.5.…”