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.

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