Considere un colector solar de aire que tiene 1 m de ancho y 5 m de largo y un espaciamiento constante de 3 cm entre la cubierta de vidrio y la placa del propio colector. El aire entra en el colector a 30°C a razón de 0.15m3 /s por el borde de 1 m de ancho y fluye a lo largo del paso de 5 m de largo. Si las temperaturas promedio de la cubierta de vidrio y de la placa del colector son de 20°C y 60°C, respectivamente, determine a) la razón neta de la transferencia de calor hacia el aire conforme fluye por el colector y b) la elevación de temperatura del aire conforme fluye a través del colector.

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg. m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?

Abrayton cycle operates with a regenerator on the air-standard with properties evaluated at 400 k. the tem- perature of the air entering the compressor is 350k while the temperature of the air exiting the compressor is 600 k. the temperature of the air entering the turbine is 1600 k. the overall cycle produced 600 kj/kg of net work out. assuming a regenerator effectiveness of 0.8, what is the temperature of the air before heat addition (combustion)? draw this process on a t - s diagram