Chapter 5, Problem 5.45P

Provide the solution and diagram. A 120 tons refrigeration system with COP of 5 has a condenser which is to be cooled by means of a cooling tower.  Air enters the tower at 25 oC db and 50% RH and leaves at 35 oC db and 80% RH. Find the volume of air needed m3/hr.    At 25oC and 50% RH:  h = 50 KJ/kg, v = 0.86 m3/kg   At 350C db and 80% RH:  h = 108         A. 7.51 m3/s    B.  2.34 m3/s      C.  4.98 m3/s      D.  3.16 m3/s

Diagram please

The following data refers to an air conditioning system to be designed for an industrial process for hot and wet climate. Outside conditions = 38o C DBT and 74 % RH. Required conditions are 23o C DBT and 65 % RH. This is achieved by cooling and dehumidifying and then by heating. If 42 m 3 of air is absorbed by the plant every minute, find the capacity of cooling coil in TR, capacity of heating coil in kW and amount of water removed per hour

Problem 04.038 Energy balance for an electrical radiator A 40-L electrical radiator containing heating oil is placed in a 50 m³ room. Both the room and the oil in the radiator are initially at 10°C. The radiator with a rating of 2.4 kW is now turned on. At the same time, heat is lost from the room at an average rate of 0.35 kJ/s. After some time, the average temperature is measured to be 20°C for the air in the room, and 70.0°C for the oil in the radiator. Taking the density and the specific heat of the oil to be 950 kg/m³ and 2.2 kJ/kg °C, respectively, determine how long the heater is kept on. Assume the room is well sealed so that there are no air leaks. The gas constant of air is R = 0. 287 kPa m³/kg K (Table A-1). Also, c = 0.718 kJ/kg K for air at room temperature (Table A-2). Oil properties are given to be p = 950 kg/m³ and cp=2.2 kJ/kg. °C (Round the final answer to three decimal places.) Room 10°C Q Radiator ces The heater is kept on for min. •SOLVE IN A HANDWRITTEN FORMAT,…

H6. An air conditioner in an upper-floor apartment unit is turned on during a hot summer afternoon. If heat can be removed from the interior at a rate of 1.5 kW, estimate the time required to cool the air inside the apartment to its final temperature. Your estimate should create any needed input data and should incorporate factors like the size of the apartment and the behavior of air.

It is planned to build a geothermal power plant for electricity generation purposes. The subsoil water reaches temperatures close to 170 ° C while the ambient temperature is 20 ° C. Find the maximum efficiency that a geothermal plant could aspire to if installed in that location.   Ans: η=33.85%

b) Air at 25°C and 1(atm) is cooled at the rate of 3000 m³/hr to -8°C by refrigeration. For a surroundings temperature of 25°C, what is the minimum power requirement ?

TH 3 kg of air as an ideal gas undergoes a Carnot refrigeration cycle as shown The isothermal expansion occurs at 300K and isothermal compression occurs at 600K. The heat transfer to air during isothermal expansion is 125 kJ. Pressure at the end of figure. isothermal expansion is 75 kPa. a. Find pressure at the beginning of the isothermal expansion. Show all work and explain your numbers. b. Sketch this cycle on the T-s diagram. Show on the diagram the system states (1,2,3, and 4), the cycle direction, and the cycle work (not its amount)

A battery is well insulated while being charged by 12.3 V at a current of 6 A. Take the battery as a control mass and find the instantaneous rate of work and the total work done over 6 h.