**2.1 JWL poultry farm**

This hybrid heating renewable system is installed in an actual poultry farm called John Wright Ltd. (JWL), located in Newark-on-Trent of Nottinghamshire in the East Midlands of England, UK. It has four poultry houses with 40,000 chickens in at a time. **Figure 2(a)** presents an actual photo of JWL. The dimension of shed 1 is 62 8 2 m (L W D) which is selected for the hybrid heating system because it is the smallest one on-site and thus needs the least heating demand in winter as given in **Figure 2(b)**- **(d)**. The photo of young birds, the control unit and 66 kW gas burner are shown in **Figure 2(e)**-**(g)**, respectively. Additionally, in shed 1, the indoor temperature should be maintained in the range from 32–20°C. The relative humidity (RH) varies from 50– 70%. Two 66 kW gas burners are utilized to warm the poultry shed in winter.
