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Heat and Mass Transfer

, Volume 55, Issue 2, pp 489–500 | Cite as

Theoretical and experimental research on using quasi saturation isentropic compression discharge temperature to control refrigerant mass flow rate

  • Lihao HuangEmail author
  • Leren Tao
  • Chao Wang
  • Lihui Yang
Original
  • 39 Downloads

Abstract

It is common to control refrigerant mass flow rate by suction superheat in a vapor compression system. This paper puts forward a method which is called Quasi Saturation Isentropic Compression Discharge Temperature (QSICDT) Control. First, this control method is used to theoretically analyze the system performance for R22, R134a, R32 and R410A refrigerants under the condition of air conditioning (AC) and refrigeration applications, and it means that the method is applicable to R22 and R32 refrigeration system through experimental study. When optimizing the discharge state, it is found that the COP has a maximum value. Second, from the experimental results, it can be known that the cooling capacity and COP could reach the maximum value, when the suction vapor quality for the R32 refrigeration system is about 0.99. The experimental results also show that using QSICDT can control the suction refrigerant with a little liquid. QSICDT Control is favorable for R32 system, which need to decrease the discharge temperature and improve the system performance. The capacity and COP all have a little increase when the wet compression is applied in R22 and R32 system. Compared to ARI superheat control, R32 COP for QSI Compression can improve 3 and 5% for AC and refrigeration application, respectively. As a result, it is possible to control refrigerant mass flow rate according to operating conditions. And it can promote and apply refrigerant R32 to the air conditioning system with low environmental burden, high energy-efficiency and relatively low cost.

Nomenclature

M

non-dimensional mass flow rate

h

enthalpy, kJ·kg−1

m

refrigerant mass flow rate, kg·s−1

P

pressure, kPa

Q

cooling capacity, kW

w

compressor power, kW

χ

vapor quality

s

entropy, kJ·kg−1·K−1

T

temperature, K

η

compression efficiency

η

the actual measured compression efficiency

Φ

compressor shell heat loss rate, kW

ρ

refrigerant density at the inlet of the compressor, kg·m−3

Vs

the volume flowrate at the inlet of the compressor, m3·s−1

FΦ

compressor shell heat loss factor ∆T - superheat, K

Subscript

s

compressor suction

is

isentropic process

d

compressor discharge

sc

condenser sub-cooling

Abbreviations

QSICDT

Quasi saturation isentropic compression discharge temperature

AC

Air conditioning

COP

Coefficient of performance

QSI

Quasi saturation isentropic

ARI

Air Conditioning and Refrigeration Institute

CHLI

Compressor heat loss index

PLC

Programmable logic controller

PID

Proportion integration differentiation

Notes

Fund projects

Shanghai key laboratory of multiphase flow and heat transfer of power engineering (13DZ2260900), Shanghai Education Committee Project (10-17-301-803), and PhD Start-up Fund(1D-16-301-007).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Refrigeration and CryogenicsUniversity of Shanghai for Science and TechnologyShanghaiChina

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