Write a detailed theory for cooling towers :energy balance, the objective being to energy balance of the system, that is to say, the energy taken by the air must be equal to the energy supplied by water flow

Write a detailed theory for cooling towers :energy balance, the objective being to energy balance of the system, that is to say, the energy taken by the air must be equal to the energy supplied by water flow

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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| Part of a refrigeration system operates at steady state with Refrigerant 22 as shown in the figure below. There is no significant heat transfer to or from the heat exchanger, valve, and piping. Kinetic and potential energy effects are negligible. State 1 is a saturated liquid. What temperature is it, in °F? Describe the refrigerant at state 4 as one of the following: compressed liquid, saturated liquid, tyro-phase mixture, saturated vapor, or superheated vapor. Determine the required mass flow for the given operating conditions, in lb/min. Determine the rate of heat transfer between the evaporator and its surroundings, in b. Btu/min. Make sure to clearly state the direction of heat transfer. 1. T=10°F P= 15 Ibf in (AV), = 9.5 ft/min. Pi= 120 Ibf/in.? Heat exchanger Throttling valve Evaporator P 15 lbfin.2 X3 = 1.0 P2= 15 lbf/in.2
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Problem 5. A 1000 cubic foot room is initially at standard temperature and pressure. A resistance heater in the room is consuming 1500W of electricity. What is the air temperature of the room after 3 hours? Assume the room acts as an isolated system. Hint: The specific heat of a substance is the amount of heat it takes to warm one unit mass of material by one degree. The specific heat of air (assuming constant volume) can be taken as C₂ = 700J/kg°C. This relates the total heat added to the system to its temperature rise.
30lb of ice at 32°F is placed in 100lb of water at 100°F. The latent heat of ice may be taken as 144 BTU/lb, Cp of water=1BTU/lb°F, Cp of ice=0.5045 BTU/lb°F. a. 48°F b. 49°F c. 50°F d. 51°F
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! Required information Problem 07.025 - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Refrigerant-134a enters the coils of the evaporator of a refrigeration system as a saturated liquid-vapor mixture at a pressure of 140 kPa. The refrigerant absorbs 200 kJ of heat from the cooled space, which is maintained at -10°C, and leaves as saturated vapor at the same pressure. Problem 07.025.a - Entropy change of the refrigerant in an evaporating process Determine the entropy change of the refrigerant. Use the tables for R-134a. (You must provide an answer before moving on to the next part.) The entropy change of the refrigerant is KJ/K.
a.) Determine the mass flow rate of the water vapor, in kg/hr.b.) Calculate the volumetric flow rate of the water vapor leaving the plant, in m^3/hr.c.) Calculate the volumetric flow rate of the brine, in m^3/hr.
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