Experimental study on multi-split air conditioner with digital scroll compressor

Tu, Qiu; Dong, Kaijun; Zou, Deqiu; Ye, Lin

doi:10.1016/j.applthermaleng.2011.04.010

Cited by 30 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is controlled by an evaporator temperature (TEV) set at -10 degree, a condenser temperature (TCD) set at 38 degrees, and a superheat temperature (TSH) at 10 degrees. In unload status, the power consumption for the digital semi-hermetic compressor was found to decrease by 50%, which had a significant impact towards energy saving and is important for night-time when low cooling load is required and the compressor's multiple start-stop cycles are not required [22][23][24]. Workflow of the digital semi-hermetic compressor is illustrated in Figure 7 and Figure 8, and the fixed-speed compressor rack compressor and digital scroll are illustrated in Figure 9, Figure 10, and Figure 11.…”

Section: Digital Semi-hermetic Compressormentioning

confidence: 99%

Improving Energy Efficiency in Supermarkets by Retrofitting Low-E Glass Doors for Open Refrigeration Systems with Digital Semi Hermetic Compressor

Saengsikhiao

Taweekun

2021

ARFMTS

View full text Add to dashboard Cite

This research will be presenting energy efficiency improvement options by retrofitting doors for open refrigeration systems in Central Thailand supermarkets that open during the daytime (06:00 am – 06:00 pm), and are closed during the night-time (00:00 am – 6:00 am). The materials and methods used consisted of 15 open refrigeration cabinets with 82 retrofitted doors supported by 41 frames, with the temperature set at medium. The power consumption was indicated in kW, kWh through a power meter data logger for analysis and summarization. The investment required was €21,694 /store, while the payback period of this research was determined to be at 14 months. The cost of energy savings was found to be within a period of 1.1 years, at the rate of 192,220 kWh/year or €18,503 annually. The retrofitted doors is expected to reduce the cooling load and over-burdening of the compressor. The research found that the most viable solution was to use a digital semi-hermetic compressor that can operate in unload and full load status, that was being controlled by the evaporator temperature (TEV) which was set at -10 degree, the condenser temperature (TCD) set at 38 degrees, and the superheat temperature (TSH) at 10 degrees. In the unload status, the power consumption of the digital semi hermetic compressor will decrease by 50%, which has a significant impact for energy savings and is important for night-time when low cooling load is required whereby the compressor’s multiple start–stop cycles are not required. The investment for a digital semi-hermetic compressor was determined to be €7,800/store, and is able to yield energy savings of up to 26,890 kWh/year, or €2,589 annually, with a payback period of 2.9 years.

show abstract

Section: Digital Semi-hermetic Compressormentioning

confidence: 99%

Improving Energy Efficiency in Supermarkets by Retrofitting Low-E Glass Doors for Open Refrigeration Systems with Digital Semi Hermetic Compressor

Saengsikhiao

Taweekun

2021

ARFMTS

View full text Add to dashboard Cite

show abstract

“…Digital compressors are compressors that can be adjusted during operation in order to suit cooling needs. They were developed as scroll compressors for use in air conditioners [49,50]. A digital semi-hermetic compressor can reduce the duty cycle to suit the current load while, in the unloaded state, not sucking or compressing the refrigerant, resulting in a 50% reduction in compressor energy consumption [51,52].…”

Section: Digital Semi-hermetic Compressormentioning

confidence: 99%

Energy Efficiency Improvement Solutions for Supermarkets by Low-E Glass Door and Digital Semi-Hermetic Compressor

Saengsikhiao

Taweekun

2021

Energies

View full text Add to dashboard Cite

This research presents an energy efficiency improvement solution for supermarkets with the use of low-E glass doors for open refrigerators and a digital semi-hermetic compressor to fix the speed of semi-hermetic compressors. The impact of a door’s installation causes its load to be reduced by 40%, and the compressor shuts down frequently, which decreases its lifetime. In order to ensure that energy-saving solutions do not affect maintenance costs, the installation of a digital semi-hermetic compressor is proposed to lower costs and save energy. Our economic results from tests carried out at a 3000 square meter supermarket, which was open from 6:00 am to 12:00 am and in which we installed 82 doors on 15 open refrigerators, showed a 1.1-year payback period with an energy saving rate of 192,220 kWh/year for store No.1 (R22) and in which we installed 80 doors on 15 open refrigerators, showed a 1.4-year payback period with an energy saving rate of 171,185 kWh/year for store No.2 (R404A). The energy-saving effects of the digital semi-hermetic compressor, which fixes the speed of the semi-compressor and solves the problem of impact from fridge door installation, showed a 2.9-year payback period with an energy saving rate of 26,890 kWh/year for store No.1 (R22) and showed a 2.9-year payback period with an energy saving rate of 26,571 kWh/year for store No.2 (R404A). The results of store No.1 (R22) and store No.2 (R404A) showed no differences. This research is an extension of an energy-saving project that can be carried out on a continuous basis, increasing the efficiency of energy use and being a sustainable source of energy conservation.

show abstract

“…The digital scroll compressor can operated in unload status and full load status as shown in Figure 4 below that controlled by evaporator temperature (Tev) set point at -10 degree and condenser temperature (Tcd) set point at 38 degree and superheat temperature (Tsh) at 10 degree, in unload status the power consumption for digital scroll compressor will decreased 50% that impact for energy saving and important for night time when low requested cooling load because compressor startedstopped many time [5].…”

Section: Digital Scroll Compressormentioning

confidence: 99%

The Improvement of Energy Efficiency for Refrigeration System in Thailand Convenience Store by Digital Scroll Compressor

Saengsikhiao¹,

Taweekun²,

Maliwan³

et al. 2020

ARFMTS

View full text Add to dashboard Cite

In this research will present energy saving of R448A refrigeration system in convenience stores 150 m 2 by digital scroll compressor that energy used 40,997 kWh/Year/Store replaced for fix speed scroll compressor that energy used 62,364 kWh/Year/Store. The digital scroll compressor can operated in unload status and full load status that controlled by evaporator temperature (Tev) set point at-10 degree and condenser temperature (Tcd) set point at 38 degree and superheat temperature (Tsh) at 10 degree, in unload status the power consumption for digital scroll compressor will decreased 50% that impact for energy saving and important for night time when low requested cooling load because compressor started-stopped many time. The methodology was measured power consumption (W), voltage (V), current (I), power factor (PF), frequency (Hz), evaporator temperature (Tev), condenser temperature (Tcd), liquid temperature (Tlq), sub cool temperature (Tsc), gas temperature (Tg), superheat temperature (Tsh) by power meter data logger and temperature data logger. The result summarized relation of all parameter and showed energy saving 34%, 21,367 kWh/Year/Store of compressor.

show abstract

Experimental study on multi-split air conditioner with digital scroll compressor

Cited by 30 publications

References 7 publications

Improving Energy Efficiency in Supermarkets by Retrofitting Low-E Glass Doors for Open Refrigeration Systems with Digital Semi Hermetic Compressor

Improving Energy Efficiency in Supermarkets by Retrofitting Low-E Glass Doors for Open Refrigeration Systems with Digital Semi Hermetic Compressor

Energy Efficiency Improvement Solutions for Supermarkets by Low-E Glass Door and Digital Semi-Hermetic Compressor

The Improvement of Energy Efficiency for Refrigeration System in Thailand Convenience Store by Digital Scroll Compressor

Contact Info

Product

Resources

About