An assembly hall was to have an air conditioning unit installed which would bemaintained at 24°C dry bulb and at 50% Relative humidity. The unit delivers air at14°C dry bulb and the calculated sensible heat load is 140 kW and the latent heatload is 50 kW. Twenty five percent by weight of extracted air is made up of outsideair at 32°C dry bulb and 18°C welt bulb temperatures while 75% is extracted by theair conditioner from the assembly hall. The atmospheric pressure is 100 kPa andRair is 287.08 j/kg-k. Using Psychrometric chart determine;a. The mass of circulating airb. The amount of moisture pick-up in the spacec. The capacity of the supply fand. The air conditioning refrigeration capacity in TORe. The dry bulb temperature entering the air condition

Answered: An assembly hall was to have an air…

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

See similar textbooks

Similar questions

In the C-D duct, with the help of a refrigeration cycle which uses R-134A as a working fluid, atmospheric air is cooled at a rate of 34 m3/min, which is entering at a temperature of 36°C and a relative humidity of fifty%. The enthalpy produced in thisprocess is 29.46 kJ/kg of mass of dry air and it is possible to cool the air to 19°C.During this process the Plant Engineers need to know the flow of water that is extracted from the incoming air and the KW needed for the cooling process if the water leaves at 19.2°C.
! Required information Problem 08.048 - DEPENDENT MULTI-PART PROBLEM - ASSIGN ALL PARTS - Piston Device with Refrigerant NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A piston-cylinder device initially contains 2 kg of refrigerant-134a at 100 kPa and 20°C. Heat is now transferred to the refrigerant from a source at 150°C, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 120 kPa. Heat transfer continues until the temperature reaches 80°C. Assume the surroundings to be at 25°C and 100 kPa. R-134a 100 kPa 20°C Q 150°C Problem 08.048.c - Exergy Destroyed by Piston Device with Refrigerant Determine the exergy destroyed. (You must provide an answer before moving on to the next part.) The exergy destroyed is kJ.
Air enters a direct-expansion coil at 90°F (32.2°C) dry bulb 60% rh, and leaves the coil at 60°F (15.6°C) dry bulb, 95% rh. Find: (a) heat removed from air (b) moisture condensed from air (c) SHR for the condition line
What is the THERMAL efficiency of each process? A completely insulated mixing vessel is designed to deliver water at 60 ⁰Cand atmospheric pressure at a rate of 4 kg/s by mixing two streams of incoming water in an environment at 25 ⁰C. Saturated steam at atmospheric pressure is inserted on the hot side. Two options are being considered for the cold side: (a) chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both at atmospheric pressure).
A storeroom of dimensions 10 x 8 x 3 m is maintained at 21oC and 50% RH and has a total heating load of 10 kW. The room is provided with 8 air changes per hour when ambient conditions are 30oC and 60% RH. Determine: a. the total cooling rate b. moisture removed per hour c. the minimum diameter of the fresh air duct so that the velocity in the duct does not exceed 3 m/s
A coal-fired boiler is used to supply 18 000 kg/hr of steam at 12.5 bar with a dryness fraction of 0.97 to a dyehouse. Feedwater temperature is 105 °C with coal supplied at 2 040 kg per hour to the combustion chamber. Assuming the calorific value of coal to be 27.4 MJ / kg and the specific heat capacity of feedwater to be 4.18 kJ/kg K , determine: the heat rate in kJ/hr the thermal efficiency of the boiler Complaints are received from the neighbourhood about the deposit of fly-ash and particulate matter on houses and buildings. Discuss briefly ONE POSSIBLE cause of this problem referring to the boiler operation and maintenance. Suggest TWO ways of addressing the above problem.
A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour. ist t Reneric o "nd h Ts diaar ntion of s) (ii) Determine the dryness fraction of the steam that is fed to the condenser. (4 marks) (iv) Determine the specific enthalpy values at the four key points of the cycle. (6 marks) Calculat "Fic of the cycle (5 Ma, KS) (vi) Determine the thermal efficiency of the cycle. (1 mark) (vii) Using the highest and lowest temperature values in the cycle, re- calculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (2 marks) arks). 2.
A space to be air-conditioned has a sensible heat load of 34.9 hp and a latent heat load of 6.97 hp. The space is to maintained at 24°C DB and 17°C WB. Outside air is at 32°C DB and 24°C WB temperatures. With a re-heater to satisfy the space conditions, the conditioned air will enter the space at 18°C. If 40% of the supply air, is fresh air and the rest is re-circulated, find the specific humidity of outside air in kgv/kgda. The mass flow rate of supply air, ms is 312 kg/min. Take the mass flow rate of supply air, (ms = the sum of air mass flow rate to dissipate the sensible heat, msh, and the air mass flow rate to dissipate the latent heat, mlh). Take cp of dry air = unity. A) 0.0155 B) 0.0070 C) 0.0130 D) 0.0092
I need the answer as soon as possible
ercise 6 6.1 A surface condenser is fitted with separate air and condensate outlets. A portion of the cooling surface is screened from the incoming steam and the air is passes over these screened tubes to the air extraction and becomes cooled below the condensate temperature. The condenser receives 20 000kg/hr of dry saturated steam at 36.2°C. At the condensate outlet the temperature is 34.6°C TK and at the air extraction the temperature is 29°C. The volume of air and vapour leaving the condenser is 3.8m3/min. Assume constant pressure throughout the condenser, calculate: 6.1.1 the mass of air removed per 10 000kg of steam (2.63kg); 6.1.2 the mass of steam condensed in the air cooler per minute (0.5kg/min)%3B 6.1.3 the heat rejected to the cooling water (13451kW).
السؤال الثالث The thermodynamic properties of refrigerant R22 mixture of liquid and vapor leaving the expansion device and entering the evaporator are: pressure of 498 KPa, temperature of 0 °C, fraction dryness (x) of 0.238, saturated liquid enthalpy of 200 kJ/kg, and saturated vapour enthalpy of 405 kJ/kg. The pressure of this refrigerant at the entrance of the condenser is measured to be 19.3 bar After the subcooling process, the enthalpy in (kJ/kg) and the pressure in (MPa) of this refrigerant have been measured and were found to be 199 47 kJ/kg and 2.3 MPa. 239. 68 kJ/kg and 1.96 MPAO 248.79 kU/kg and 1.93 MPa 110 52 kJ/kg and 3.1 MPa 1:29 PM 91°F Sunny 5/14/2022
Exercise-47: It is required maintain an air conditioned hall at DBT=28 °C, and WBT=20 °C, Q = 45.4 kW, Q = 16.5 kW. Outside air at DBT=39°C, and WBT=28 °C is mixed with the return air is ratio of (1/4) by volume and then mixture is passed through a cooling coil with apparatus dew point temperature of 9 °C, determine; the temperature of the air after the cooling coil, volume flow rate of air supplied to the hall, BPF, cooling coil load, plot the processes of the system.

Recommended textbooks for you

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Control Systems Engineering

Mechanical Engineering

ISBN:

9781118170519

Author:

Norman S. Nise

Publisher:

WILEY

Mechanics of Materials (MindTap Course List)

Mechanical Engineering

ISBN:

9781337093347

Author:

Barry J. Goodno, James M. Gere

Publisher:

Cengage Learning

Engineering Mechanics: Statics

Mechanical Engineering

ISBN:

9781118807330

Author:

James L. Meriam, L. G. Kraige, J. N. Bolton

Publisher:

WILEY

SEE MORE TEXTBOOKS