# The rotary air preheaters at the Moss Landing power plant have the following geometry and operating.

The rotary air preheaters at the Moss Landing power plant

have the following geometry and operating conditions: 14.63-m disk diameter

with Ah = Ac = 31,120 m2 /unit, m_ gas m_

air = 340 kg/s per preheater, effectiveness ” =

65%, Mw = 1121 kg/m3 of total volume, csteel =

460:6 J/kg K, cair cgas = 1026

J/kg K, and the matrix air flow length = 1.52 m. The preheater rotates at 48

rev/h. What are the disk heat capacity rate ratio Cr * and the disk NTUo? What

is the average air-side convective conductance? Assume that hc hh.

Explain why you would neglect longitudinal

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The rotary air preheaters at the Moss Landing power plant

have the following geometry and operating conditions: 14.63-m disk diameter

with Ah = Ac = 31,120 m2 /unit, m_ gas m_

air = 340 kg/s per preheater, effectiveness ” =

65%, Mw = 1121 kg/m3 of total volume, csteel =

460:6 J/kg K, cair cgas = 1026

J/kg K, and the matrix air flow length = 1.52 m. The preheater rotates at 48

rev/h. What are the disk heat capacity rate ratio Cr * and the disk NTUo? What

is the average air-side convective conductance? Assume that hc hh.

Explain why you would neglect longitudinal conduction in the wall for this

problem. In this case, the C of Eq. (5.122) is assumed as zero.

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