... transfer coefficient betweenforced draught air and a vertical plane surface ([1], Chapter 3,Table 6) gives:h′ = 5.6 + 18.6V8 Refrigeration and Air- Conditioning Table 1.3Number Sign ParametersReynolds ... 0.20–0.30Polished metals 0.02–0.28The metals used in refrigeration and air- conditioning systems, suchas steel, copper and aluminium, quickly oxidize or tarnish in air, and the emissivity figure will increase ... factors are aboutequal.12 Refrigeration and Air- Conditioning The exception to this is the effect of solar radiation whenconsidered as a cooling load, such as the air- conditioning of a buildingwhich...