An auditorium is designed to seat 200 people. The ventilation rate is 2.50 x 10 m' h of outside air, or 3.3 x 10' kg/h. The outside temperature is -10°C dry- bulb, and the outside pressure is 101.3 kPa. Air leaves the auditorium at 23°C dry-bulb. The air temperature entering the auditorium is 21.6°C. Most nearly, how much heat should be supplied to the ventilation air? C. 540 kW D. 780 Kw A. 120 kW B. 290 kW

1) A 10 Liter pressure cooker has an operating pressure of 400 kPa. Initially, % of the volume is filled with saturated water and the rest is saturated vapor. What temperature is the vessel? After heating for 5 hours, the pressure cooker ran dry. What was the average rate of heat transfer?

An industrial fan delivers 247 cubic feet per second of air that passes inside a 17 inch x 57 inch duct outlet. The static pressure is 1.74 inch WG with an ambient condition of 74°F and atmospheric pressure. Find the Hp capacity of the fan. a. 6.76b. 4.76c. 5.76d. 3.76

What comes up next to the Heat value of natural gas? Q is what? Also, in Fuel Oil, where does the heat required come from?

3.24 You want to cool air from 150°C to 60°C but you cannot afford a custom-built heat exchanger. You find a used cross-flow exchanger (both fluids unmixed) in storage. It was previously used to cool 136 kg/min of NH3 vapor from 200°C to 100°C using 320 kg/min of water at 7°C; U was previously 480 W/m²K. How much air can you cool with this exchanger, using the same water supply, if U is approximately unchanged? (Actually, you would have to modify U using the methods of Chapters 6 and 7 once you had the new air flow rate, but that is beyond our present scope.)

1. Saturated steam at a pressure of 25 psia is sprayed into a stream of moist air. The initial condition of the air is 55 dry-bulb temperature and 35 F de-point temperature. The mass rate of air flow is 2000 lb per min. Barometric pressure is 14.696 psia. Determine how much steam must be added in lb per min to produce a saturated air condition, b) the resulting temperature of the saturated air.

Example A 5-hp fan is used in a large room to provide for air circulation. Assuming a well-insulated, sealed room determine the internal energy increase after 1h of operation.

Switching the temperature for the steam table  (c)  to be 160 C and the pressure to be 5000kpa (it was a error)