COMPARISON OF ROTARY AND RECIPROCATING COMPRESSORS

The comparison of rotary and reciprocating compressors is given in Table 13.1.

 

Table 13.1 Comparison of rotary and reciprocating compressors

Example 13.3

Free air of 30 m³/min is compressed from 101.3 kPa to 2.23 bar in roots blower. Determine the power required and the isentropic efficiency.

Solution

The p − V diagrams for roots blower is shown in Fig. 13.7.

Figure 13.7 p − V diagrams

V₁ = 30 m³/min, p₁ = 101.3 kPa

p₂ = 2.23 bar

Refer Fig. 13.8.

Indicated power, I.P. = 

Isentropic indicated power, (I.P.)_isen = 

Isentropic efficiency, η_isen =