A heat pump based on the ideal VC cycle of Figure 13.5(b)

uses the refrigerant R-134a to heat a house. The set points are T_? = ?8 ^?C, T₊ = 40 ^?C. What is the CoP; how does it compare with the Carnot limit? What flow rate (m? ) in kg/s is required to provide heat at 50 kW? Relevant thermodynamic data for R-134a is provided in Table 13.5. since this is an ideal VC cycle, as opposed to the modified cycle analyzed in ?13.2.5, the maximum temperature T₂ must be determined. To find T₂, data in the super heated region are required. Alternatively you can approximate T₂ ? T₊.

Table 13.5

Transcribed Image Text:

380 360 2 340 320 Т T. 3 P+ {23} 300 W12 280 (12} 260 T. 240 0.8 1.0 1.2 1.4 1.6 1.8 (b) entropy [kJ/kg K] temperature [K]