In this study, we study the water source heat pump and digital scroll compressor and experimentally in the multi-connected air-conditioning system. Variable performance is developed when the unit operates in refrigerating and heating mode. The maximum of refrigerating capacity is 36519.95W when inlet water temperature of the condenser is 30°C and dry-bulb temperature of indoor air is 32°C, at the same time the maximum of EER is 4.33 when inlet water temperature of the condenser is 20°C and dry-bulb temperature of indoor air is 27°C. The unit operates in heating mode, the maximum of heating capacity and EER is 33275.73W and 3.86 when inlet water temperature of the condenser is 30°C and dry-bulb temperature of indoor air is 20°C.

a novel type of compound system for heat pump water heater is put forward in this paper, the component and fundamentals are introduced, and the experimental research is developed under the different working conditions. The results show that the maximum value of total EER of system is 11.03, and the minimum is 4.25, the average value is 7.532 in compound mode. There are the dynamic change of COP and operation characteristics for refrigerating capacity, consumption power of the system, heating capacity and suction and discharge temperature and pressure, and their effect on the operation of system is discussed and analyzed.

Water source heat pump and digital scroll compressor are used and experimentally studied in the multi-connected air-conditioning system in this paper, some helpful technology data are obtained improving the practical application and performance of water source multi-connected air-conditioning system with digital scroll compressor. The design of water source multi-connected air-conditioning system with digital scroll compressor is designed and setup. Experimental performance of water source multi-connected air-conditioning system with digital scroll compressor is studied in three main parts, the first one is the performance of system in part load, and the IPLV of system is 3.65; When the unit operates in 50% load, EER reaches up to 3.99. © Sila Science. All rights reserved.

A new type of air source heat pump water heater system with scroll compressor through middle injection of economizer in the course of compression is put forward operating reliably long and efficiently in low temperature in this study. The experimental prototype is set up, System fundamentals and the operation modes are introduced, Experimental research on operation characteristics of the unit in three different operation conditions is done in the lab of enthalpy difference; Heating capacity and COP were 8.84 kW and 2.43, respectively under the condition of environmental temperature of which is -7 and -8oC, respectively for dry bulb temperature and wet bulb temperature. The result shows that the unit operates reliably long and that heating capacity and COP of the unit are improved in low temperature.

The relatively assistant heating and cooling technologies to adjust mould and resin temperature during the injection moulding processing were discussed, including heated water, electric heater, induction heating and chill water. Firstly, the heating/cooling effects on the uniformity of mould temperature field and the time consumption to obtain the ideal processing temperature were considered by experiments. Then the appearance quality of moulded parts (surface roughness) produced by the heating/ cooling technologies were measured.