An air-conditioning system working in a vapor-compression cycle is used to manage the load for the building in Problem 7.26. If the high and low pressures in the cycle are 915 and \(290 \mathrm{kPa}\), respectively, and the efficiency of the compressor is \(90 \%\), find the flow rate of Refrigerant 134a (R-134a) used for the equipment and the COP of the cycle.

Problem 7.26

The following table gives the characteristics of a building in Houston, TX. Determine the cooling load for July 30 at solar noon. Any information regarding the load not given may be assumed or neglected.

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Factor Roof Type Area Arfsh (m) U factor (W/mK) Walls Orientation, size (mx m) U factor (W/m K) Windows Orientation, area (m) U factor (W/mK) Insolation transmittance Description or Specification Flat, shade 250 U = 0.35 Vertical, painted white North, south, 3 x 10; east, west, 3 x 25 u = 1.08 North, 8; south, 8; east, 20; west, 25 u = 6.2 b=0.60; d=0.80;= 0.55 Temperature Inside, outside (C) Insolation Tin = 24; Tout = 37 Beam, diffuse, reflected (W/m) = 580; 1= 250; 1, = 200