8.4.1 Introduction8.4.2 How do refrigerated containers work?8.4.2.1 Air flow and regulation8.4.2.2 Temperature records8.4.2.2.1 Circular temperature charts8.4.2.2.2 Data loggers8.4.2.2.3 Temperature recorders in the load8.4.2.2.4 Manual temperature records8.4.2.2.5 Remote monitoring8.4.2.2.6 Conair or porthole containers8.4.2.3 Influence of the stowage methods on the return air temperature8.4.3 Temperature changes within the container8.4.3.1 Temperature increases without refrigeration8.4.3.1.1 Calculating the increase in temperature8.4.3.1.2 Numeric calculation of the increase in temperature8.4.3.2 Cooling of the cargo during refrigeration8.4.4 Summary