The Design of Monitoring System and Experimental Study of the Solar Assisted Heat Pump Unit with Cooling, Heating and Gaining Hot Water

Solar assisted heat pump is a system that can not only be used as refrigeration and heating, but also supply with life heat water. Because of this technology makes use of solar energy and air heat source maximum, COP coefficient rises dramatically and solving the frost of surface of heat exchange fans in air oil pipe outdoors. This technology can combine heat pump energy-saving which is driving to mature and high commercial degree with solar energy. It offsets the shortage of both heat pump energy-saving and solar energy. And it has merit of compact configuration, multi-form, credible circulation, distinct energy-saving, long life and so on. So, in view of the above questions, this article put forward a new unit of solar assisted heat pump system with the function of cooling, heating and gaining hot water. This article aimed at the character of the system explores a set of monitored control system. The system can carry out three-operating mode switch and collection, show and memory of experiment data.First, this article provides the composition and working principle of the system, then according to system’s monitored control and control request on the basis of operating principle of the system, presents monitor scheme. The control system is made up of human-machine interface, PLC and detection system. Then, the article introduces in detail the principle of thermophysical parameters (temperature, pressure) and the lectotype scheme of the instruments. And it also presents control scheme of the system, compressor’s energy regulation scheme, the lectotype scheme of human-machine interface and PLC. Finally, do the program of the touch screen and PLC. The touch screen not only realizes operating mode choose, setting value input, real-time digital display of temperature and pressure, real-time curve display, history record, but also analysis the data detected from the system then send the message to PLC, PLC drive each switch, equipment to execute action, this complete a set of complete control line.This paper adopts HeLiShi PLC and KunLunTongTai MCGS software to construct a set of monitoring system to monitor the system of solar assisted heat pump system with cooling, heating and gaining hot water, According to the experiment results, the monitoring system design is rational and further research of this task can be established.