**2. System description**

**Figure 1** illustrates the fundamental design schematic of the hybrid renewable heating system. To be more specific, the hybrid system could produce highly efficient heating by solar photovoltaic/thermal (PV/T) array with a novel category of cheap polyethylene heat exchanger (PHE) loop assisted a heat pump and couple to a low expense geothermal copper pipe array. The PV/T module can simultaneously produce electrical energy for driving the running of heat pump compressor and thermal energy for inputting to the heat pump evaporator along with the geothermal pipe array. In the meantime, geothermal energy can offset the heat source production from the PV/T module for heat pump condenser, such as in the absence of solar radiation or nighttime. The fan coil as a recirculation device is utilized to provide space heating to the poultry shed.
