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Effects of the nozzle throat diameter on a bi-evaporator compression/ejection refrigeration system

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Abstract

In this study, the ejector was used to reduce throttling losses in the bi-evaporator compression/ejector refrigeration cycle (BCERC) using R134a refrigerant. Effects of the nozzle throat diameter on the performance of ejector and the BCERC were investigated experimentally under different working conditions. This experiment further investigated the effects of operating parameters on the BCERC by changing the inlet temperature of the condenser and the high-temperature evaporator. The performances of the BCERC and the vapor compression refrigeration cycle are also compared under the same external operating conditions. The results show there exists an optimal nozzle throat diameter of 1.9 mm which makes the maximum value of the ejector pressure lifting ratio (PLR), the system cooling capacity and the coefficient of performance (COP). In order to ensure a high cooling capacity and COP of the system, the inlet water temperature of the condenser should be controlled within the range of 25 ℃ to 35 ℃ and the inlet water temperature of the high-temperature evaporator should be greater than 14 ℃. At the optimum the nozzle throat diameter, the BCERC exhibits a higher COP than the vapor compression refrigeration cycle by 10.2% ~ 27.8%.

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Abbreviations

BCERC:

Bi-evaporator compression/ejection refriger-ation cycle

C:

Heat capacity (kJ (kg·°C)−1)

COP:

Coefficient of performance

CR:

Compressor compression ratio

D:

Diameter

f :

Compressor frequency

h :

Enthalpy

m :

Mass flow rate (kg·h−1)

P :

Pressure (kPa)

PLR:

pressure lifting ratio

Q :

Capacity (kW)

q :

capacity (kW)

T :

Temperature (°C)

W :

Compressor power (kW)

Δ:

Difference

Ci:

Condenser inlet

Cp:

Compressor

df:

Ejector outlet flow

he:

High-temperature evaporator

le:

High-temperature evaporator

i:

Inlet

nt:

Nozzle throat

o:

Outlet

p:

Primary flow

s:

Secondary flow

w:

Water

1–9, 0:

State point

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Acknowledgements

This work is supported by Henan Province Science Foundation for youths (20230040422) and Key Scientific Research Project of Colleges and Universities in Henan Province of China (21A470005).

Funding

Natural Science Foundation of Henan Province,20230040422,Huadong Liu,Key Scientific Research Project of Colleges and Universities in Henan Province,21A470005,Huadong Liu

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Authors and Affiliations

  1. School of Mechanical and Power Engineering, Zhengzhou University, Henan, 450001, China

    Huadong Liu, Hao Dang, Zhaoyang Jin, Xinli Wei, Zhe Li & Hailu Shi

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  1. Huadong Liu
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  2. Hao Dang
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  3. Zhaoyang Jin
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  4. Xinli Wei
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  5. Zhe Li
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Correspondence to Huadong Liu.

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We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of. The manuscript entitled, “Effects of the nozzle throat diameter on a bi-evaporator compression/ejection refrigeration system”.

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Highlights

• A study of the nozzle throat diameter of the ejector in the BCERC was performed.

• The effects of the nozzle throat diameter on the performance of the ejector and the BCERC were investigated.

• he effects of the inlet temperature of the condenser and the high temperature evaporator on the performance of the system were investigated under the optimal nozzle throat diameter.

• The performance of the BCERC and the VCRC was compared under the optimal nozzle throat diameter.

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Liu, H., Dang, H., Jin, Z. et al. Effects of the nozzle throat diameter on a bi-evaporator compression/ejection refrigeration system. Heat Mass Transfer 58, 2207–2219 (2022). https://doi.org/10.1007/s00231-022-03205-2

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  • DOI: https://doi.org/10.1007/s00231-022-03205-2

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