A convective kerosene heater is tested in a well-mixed 60 m3 chamber having an air exchange rate of 0.3 ach. After one hour of operation, the nitric oxide (NO) concentration reached 3 ppm. Treating NO as a conservative pollutant, estimate the NO source strenght of the heater (in mg/hr).
Assume: 25 oC and 1 atm

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.