Performance assessment of heat pump water heaters with R1233zd(E)/HCs binary mixtures
| Autor: | Xiaowei Fan, Honglin Zhang, Yaping Chen, Fujun Ju, Tuanjie Wang, Xiangyang Tang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
020209 energy Zeotropic mixture Energy Engineering and Power Technology Thermodynamics 02 engineering and technology Coefficient of performance Heat sink Industrial and Manufacturing Engineering law.invention 020401 chemical engineering law Heat transfer Heat exchanger 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Condenser (heat transfer) Evaporator Heat pump |
| Zdroj: | Applied Thermal Engineering. 123:1345-1355 |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2017.05.137 |
| Popis: | The eco-friendly zeotropic mixtures of R1233zd(E) with four hydrocarbons were investigated to replace the traditional refrigerants (R22 and R134a) in heat pump water heaters. Under the nominal working condition, the performances of heat pump were analyzed by establishing the mathematical model based on the fixed pinch point temperature difference in the heat exchangers. The results show that both blends R1233zd(E)/R1270 and R1233zd(E)/R290 are suitable drop-in candidates of R22 or R134a for heat pump water heaters. The R1233zd(E)/R1270 with optimal mass fraction 16%/84% demonstrates the best system COP which is respectively 2.13% and 10.14% higher than those of R22 and R134a. The temperature glide feature of zeotropic mixture influences on the system COP greatly in matching both heat transfer processes in condenser and evaporator. The heat sink outlet temperature influences the system COP greatly that when it is 45, 55 or 65 °C, the corresponding maximum system COP is 5.803, 4.646 or 3.888 with R1233zd(E)/R1270 and 5.724, 4.535 or 3.757 with R1233zd(E)/R290 respectively. Also, the optimal fraction of R1233zd(E) shifts to a slightly higher value with the rise of heat sink outlet temperature. |
| Databáze: | OpenAIRE |
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