H.W.10.5. The following data for steam condenser: Steam condensed = 50000 kg/h Temperature of steam in condenser = 40 °C Dryness of steam entering into condenser = 0.85 The air leakage in the condenser = 150 kg/h Temperature of the condensate = 35 °C Find, 1. The air leakage pressure 2. Quantity of cooling water passed through the condenser per hour if the rise in cooling water temperature is limited to 10 °C

1. A heat exchanger is located on the roof of a warehouse to heat the air in winter. It is a coil-shaped pipe into which water vapor enters at 0.1 MPa and 300 °C and leaves with a quality of 30%. The warehouse has the following dimensions: 80m x 160m x 10m. The air must be heated from 5°C to 22°C. a. What must be the mass flow rate of the water to heat the air in less than half an hour? b. We want to cool the steam from the exchanger outlet and bring it up to 50 °C. For this, a mixing chamber with water at 20 °C is used, what will be the proportion of the steam mixture? c. The exchanger is damaged and only liquid water can be used at the same pressure (inlet T. 1 °C below saturation and outlet T. at 30°C). How long does it take to heat the air with the same flow of water?

Determine the compressor work, W,comp. And the condenser heat transfer, Qc.

10. An adiabatic air compressor (does not exchange heat with the environment) has an efficiency of 40% and a power of 1.5 kW. This is used to compress 30 kg/h of air with atmospheric conditions (P=77 kPa, T = 298 K). The final pressure is 246.5 kPa. i. What is the initial specific volume and what is the final enthalpy of the air? J. What must be the volume of the tank to store the compressed air in 8 working hours of the compressor?