Low-power Direct Evaporative Solar Heat Pump Hot Water System Research And Testing

Solar energy is a sort of never-failing clean energy sources, and how to more effectively utilize it has increasingly become a hotspot scientists tap with efforts. The characteristic of heat pump consist in that it can transfer heat from low temperature to high temperature, and improve the rates of low temperature heat sources. There will be a great future if we integrate solar energy utilization techniques into heat pump techniques. On the base of integrating the two techniques, the paper analyzed the art trait of heat pump water heater, the manner of integration, the essential theory; and developed a small capacity direct expansion solar-assisted heat pump water heater, and tested its thermal performance on the condition of different weather such as sunshine, overcast sky & night. The results make clear a small capacity direct expansion solar-assisted heat pump water heater can absorb not only solar energy but heat energy in air; it takes on favorable thermal performance, on the condition of different weather such as sunshine, overcast sky & night,COPH is about between 3.5~5.0, EER is about between 2.5~4.5, theseare better than traditional air source heat pump water heater and non-direct expansion solar-assisted heat pump water heater, and it takes between 2 and 3 kwh to heat 270 kg water from 20 C to 50 C, it is very great in terms of saving energy and protecting environment,. Furthermore, the paper analyzed and viewed its industrialization application foreground, and made some suggestions on optimizing the system for it becomes successful product.