5-84 Air (C₂=1.005 kJ/kg°C) is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. Air enters the heat exchanger at 95 kPa and 20°Ct at rate of 0.6 m³/s. The combustion gases (Cp=1.10 kJ/kg°C) that enter at 160°C at a rate of 0.95 kg/s and leave at 95°C. Determine the rate of heat transfer to the air and its outlet temperature. Air 95 kPa 20°C 0.6 m³/s Exhaust gases 0.95 kg/s 95°C

A heat exchanger is to heat water (cp = 4.18 kJ/kg·oC) from 25oC to 60oC at a rate of 0.2 kg/s. The heating is to be accomplished by geothermal water (cp = 4.31 kJ/kg·oC) available at 159oC at a mass flow rate of 0.3 kg/s. Find the exit temperature of geothermal water.

3- Milk at 400C with a specific temperature of 3.85 kJ / kg K will be pasteurized at 75 oC using saturated steam at 120 oC in a plate heat exchanger. The heat exchanger operates in parallel current. In heating, the latent heat of the steam is used. What is the steam / milk ratio accordingly? The data required for steam is given in the table below. Enthalpy (MJ / kg) Temperature (oC) Absolute pressure (kPa) Saturated liquid Evaporation Saturated steam75 38.5575 0.31394 2.3214 2.6354120 198.54 0.50372 2.20225 2.70607 A. 17,75B. 56.33C. 0,056D. 0,017E. 68,7

Air (cp = 1.005 kJ/kg·°C) is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. Air enters the heat exchanger at 95 kPa and 20°C at a rate of 0.75 m3/s. The combustion gases (cp = 1.10 kJ/kg·°C) enter at 160°C at a rate of 0.95 kg/s and leave at 95°C. Determine the rate of heat transfer to the air and its outlet temperature. The rate of heat transfer to the air is ___ kW. The outlet temperature is ___°C.