Príspevok
ENERGETIC EFICENCY OF COOLING CIRCUIT DEPENDING ON THE CHARGE OF THE PREVIOUS AND NEW ALTERNATIVE REFRIGERANT
DOI: 10.18462/iir.compr.2017.0209
Sekcia: Refrigerants low GWP, oils. Chaired by Vaclav Havelsky, Martin Dieryckx, Joachim Gerstel
Stav prijatia: Príspevok prijatý
Autori
| Meno | Organizácia | |
|---|---|---|
| Jaroslav Šustek | ||
| Peter Tomlein |
Abstrakt
Energetic efficiency of cooling circuit influences the amount of refrigerant, which is changing when refrigerants with high GWP are substituted by refrigerants with low GWP. Refrigerants substitution R404A for R449A was carried on experimental cooling box with own cooling circuit and original refrigerant R404A with air cooled condenser. Heating load was selected adequately to cooling output of evaporator, which was possible to regulate by speed of ventilators. Cooling circuit was tested by ClimaCheck. Measured were 2 pressures, 9 temperatures humidity of surroundings and inside the box. Parameters were measured in real time in chosen interval. Measuring Mwere carried on with increasing and with decreasing charge of refrigerant. Optimizing of refrigerant was carried on in the range of very low and very high refrigerant charge due to installed a collector in the liquid line. Deciding parameters for the evaluation of energetic efficiency before and after refrigerant substitution were superheating and subcooling under stabile function of cooling circuit. Measuring proved different results with compared refrigerants and the need for adjusting of thermostatic expansion valve after the retrofit.
Kľúčové slová
Refrigerants, retrofit, superheating, subcooling