An industrial process is using river water to cool 105 kg/h of saturated steam in a...

An industrial process is using river water to cool 10⁵ kg/h of saturated steam in a heat exchanger at 0.1 bar. The cooled steam exits the heat exchanger as a saturated liquid at the same pressure of 0.1 bar to be used in the process. The river water has a volumetric flow rate of 500 ft³/s and is the coolant in the heat exchanger., having properties close to pure water (i.e., density – 1000 kg/m³). It exists the heat exchanger with the same mass flow rate, and is returned to the river, but at a higher temperature. The river water on a hot summer day is 20 ⁰C at the heat exchanger inlet, and near the mixing point of the discharged water from the heat exchanger. Operation is at steady state and kinetic and potential energy can be neglected. Since a higher river temperature results in lower dissolved oxygen there may be a risk of killing fish or even “stressing” them. For example, rainbow trout stop growing at sustained river temperatures of 73°F (23° C), and die at about 80 ⁰F (27 ⁰C). Should the owner of this industrial process be concerned for the fishes and local fisherman’s livelihood? Please comment by calculating the temperature rise of the river at the heat exchanger’s exit that discharges into the river.

Hint: properties of the saturated and compressed water can be found in tables: Table A-3 and Table A-5.

Expert Solution

samet mamat answered 2 years ago

3.- In an industrial process, a concentric tube exchanger is used to cool 1800 Kg /...

3.- In an industrial process, a concentric tube exchanger is used to cool 1800 Kg / hr of ammonia from 80 ° C to 35 ° C circulating through the annular space, with 1485 Kg / hr of water entering the concentric tube at 25 ° C. The water leaving the exchanger is sent to a mixing tank with agitation, which is fed by another stream of water at 15 ° C in order to reduce its temperature to 25...

A mixture of saturated liquid water and saturated steam at T = 120 °C has a...

A mixture of saturated liquid water and saturated steam at T = 120 °C has a specific enthalpy of 2000 kJ⁄kg. What is the quality of this mixture? if you could show how to do it, that'd be great.

Separation Process: Consider the in-class demonstration problem involving the MeOH/water separation. Suppose that a saturated steam...

Separation Process: Consider the in-class demonstration problem involving the MeOH/water separation. Suppose that a saturated steam feed was injected into the bottom of column (it is sparged to get good contact with the liquid that is falling down from the tray above its entrance). Take the specifications for the feed to be identical as in the McCabe-Thiele demonstration done in class (zF = 0.36, F = 216.8 kmol/h). Further, the compositions of the distillate and the bottoms should be the...

Liquid water at 15 ℃ is heated by mixing it with saturated steam at the same...

Liquid water at 15 ℃ is heated by mixing it with saturated steam at the same pressure. Liquid water enters a chamber at a rate of 4.3 kg/s and saturated steam enters at a rate of 0.17 kg/s. The mixture leaves the mixing chamber as a saturated liquid at 40℃. If the surroundings are at 15℃, determine (a) the temperature of the saturated steam entering the chamber, (b) the exergy destruction during this mixing process, and (c) the second-law efficiency...

In a process plant, a large amount of saturated steam is available at a pressure of...

In a process plant, a large amount of saturated steam is available at a pressure of 2 MPa. Connected to the saturated steam system through a valve is a turbine followed by a well insulated tank which is initially evacuated (P=0). The volume of the tank is 2000 L. When emergency power is needed, the valve is opened and steam flows through the turbine, generating power and the tank fills until its pressure is 2 MPa. At the end of...

(a) Dry saturated steam at a temperature of 180ºC is to be produced in a fire tube boiler from the cooling of 50 000 kg h–1 of flue gases from a pressurised combustion process.

(a) Dry saturated steam at a temperature of 180ºC is to be produced in a fire tube boiler from the cooling of 50 000 kg h–1 of flue gases from a pressurised combustion process. The gases enter the tubes of the boiler at 1600ºC and leave at 200ºC. The feed water is externally preheated to 180ºC before entering the boiler. The mean specific heat capacity of the flue gases is 1.15 kJ kg–1 K–1. The latent heat of vaporisation...

1 kg of saturated steam at 1000 kPa is in a piston-cylinder and the massless cylinder...

1 kg of saturated steam at 1000 kPa is in a piston-cylinder and the massless cylinder is held in place by pins. The pins are removed and the system suddenly and adiabatically expands to 5x its original volume before the piston hits a pair of upper pins. The expansion takes place against an atmosphere is 60 kPa. What is the final specific internal energy of the system? The answer will be in kJ/kg.

Saturated water vapor at 1000 kPa is throttled to 100 kPa. The velocity of the steam...

Saturated water vapor at 1000 kPa is throttled to 100 kPa. The velocity of the steam remains constant through the process. Determine the exit temperature of the water vapor. I know this is already awnsered in a solution for 1st edition but can someone help me understand what they do and how they picked the numbers they did from some table to get the exit temperature?

1) Saturated liquid water at a pressure of 10 kPa is sent to a steam boiler...

1) Saturated liquid water at a pressure of 10 kPa is sent to a steam boiler with a pressure of 4MPa with a reversible adiabatic pump and heated up to 500oC at constant pressure in the boiler. The mass flow of the steam is 4.2 kg / s. Transactions are carried out continuously. a) Show the processes on the T-v or T-s diagram with saturated vapor and liquid curves. b) Calculate the required pump power c) Calculate the amount of...

Determine the temperature, volume, and quality for one kg of water at H=3500kJ/kg, P =0.1MPa. (Using...

Determine the temperature, volume, and quality for one kg of water at H=3500kJ/kg, P =0.1MPa. (Using steam tables)

Question