Specify is the following conditions are comfort or not: 1- DBT 22 C° and WBT = 16 Cº 2- DBT=24 C° and RH- 80 % B- Compare between the following: 1- Cooling load and the heat gain. 2- Overall heat transfer coefficient and convection heat transfer coefficient.
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- Thermodynamicclass contains 32 undergrad students. The plan is to air-conditionthe classroomwith air-conditioning units of 8-kW cooling capacity. It is assumed that on average each studentdissipate heat at a rate of about 300 kJ/h. There are 12lightbulbs in the room, each with a rating of 100 W. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 14,000 kJ/h. If the room air is to be maintained at a constant temperature of 23oC,i.e. ∆?????≈0, determine the number of air-conditioning units required.13 .Mexico's metro requires the implementation of an air conditioning system for each of its cars. On the hottest days the air inside the car can reach 45°C. A temperature of 25°C is expected to be achieved to keep passengers satisfied. A car measures 17 m x 2.5 x 2. In order to make the decision on the air conditioning system to install, the engineering director has asked to calculate: A. Amount of energy to be removed from the car when the air is at 45°C and the car is empty. B. Amount of energy to withdraw when the car is full (approx. 130 people with a volume of 0.06 m3/person). Each person releases 30 kJ while in the car. C. Power of a system that removes the estimated energy A and B in less than 1 minute.The inside design conditions for a conditioned space are 20.1 degree C dry-bulb and15.2 degree C wet-bulb. The air temperature increases 10.6 degree C as it passes through theconditioned space. The apparatus dew point is 11.9 degree C. The heat transfer rate is 456kW. What is most nearly the volumetric flow rate of the air passing through thespace?A. 12 m3/s B. 19 m3/s C. 22 m3/s D. 36 m3/s
- Which of the three air-conditioning possible systems listed below should be used to maintain the indoor temperature of a house at 20°C while resulting in a daily lower operating cost when the outdoor temperature is -2°C. Based on the construction of the house you estimate that under the given indoor and outdoor temperatures the rate of heat loss to the surroundings is 17 kJ/s. Which system would you recommend as a feasible alternative? Support your answer for each one of the cases below with convincing computations that show which one of the systems is requires the minimum electrical power while being in compliance with the first and second law of thermodynamics. a. Electrical heating b. A heat pump with COPHP = 3.0 c. A heat pump with COP = 14.0A summer air conditioning system (schematic shown below) consisting of a cooling coil and a reheat coil, supplies air to a space maintained at 26°C db-temperature and 19°C wb-temperature. The sensible and latent heat loads on the space are both 18 kW and 18 kW, respectively. The conditions of the air leaving the cooling coil are 10°C db-temperature and 90% relative humidity. The pressure is constant at 101.325 kPa. About 30% of the return air is replaced with outdoor air at 30°C db-temperature and 80% RH. Determine: The db-temperature of supply air in % The dry-air mass flow rate of supply air in kg/sThe power required to drive the compressor in a Carnot refrigerator is 62 hp. It operates between -5°C and 42°C Determine the coefficient of performance. Answer in 3 decimal places.
- HVAC UPVOTE WILL BE GIVEN. ANSWERS ARE GIVEN ALREADY. PLEASE WRITE THE COMPLETE SOLUTIONS. 2. A room being air conditioned is held at 25°C db & 50% RH. A flow rate of 5m³/s of supply air at 15°C db & 80% RH is being delivered to the room to maintain steady condition at 100 kpa. What is the sensible heat absorbed from the room air in kw? 2. A room being air conditioned is held at 25°C db & 50% RH. A flow rate of 5m³/s of supply air at 15°C db & 80% RH is being delivered to the room to maintain steady condition at lookpa. What is the sensible heat absorbed from the room air in kw? a) 50.8 b) 60.8 c) 40.5 d) 70.9 c)40.5 d) 70.9The power required to drive the compressor in a Carnot refrigerator is 55 hp. It operates between -4°C and 37°C. Determine the coefficient of performance. Answer must be in 3 decimalsQ4/ An air conditioning system is to be designed for a restaurant with the following data: Outside design conditions = 40C db, 28C wb Inside design conditions = 25C db, 50% RH Solar heat gains through walls, roof and floor = 5.87 kW Solar heat gain through glass = 5.52 kW Occupants = 25 Sensible heat gain per person = 58 W Latent heat gain per person = 58 W Internal lighting load = 15 lamps of 100 W 10 fluorescent tubes of 80 W Sensible heat gain from other sources = 11.63 kW Infiltration air = 15 m3/min If 25% fresh air and 75% recirculated air is mixed and passed through the cooling coil, find: a- The amount of total air in m3/h. b- The dew point temperature of the coil. c- The condition of the supply air to the room. Assume the BPF = 0.2 Draw the schematic diagram of the system and show the system on psychometric chart.
- 3. A classroom that normally contains 40 people is to be air-conditioned with window air-conditioning units of 5-kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 kJ/h. There are 10 light bulbs in the room, each with a rating of 100 W. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 kJ/h. If the room air is to be maintained at a constant temperature of 210C, determine the number of window air-conditioning units required. draw a figure also, and explain each step by step solution.The power required to drive the compressor in a Carnot refrigerator is 62 hp. It operates between -6°C and 45°C. Determine the coefficient of performance. Final answer must be in 3 decimal places.Air enters a cooling coil at the rate of 5000 cfm (2.4 m3/s) at 80 F (27 C). db, 68 F (20 C) wb and sea-level pressure. The air leaves the coil at 55 F (13 C) db, 54 F (12 C) wb. (a) Determine the SHF and the apparatus dew point. (b) Compute the total and sensible heat transfer rates from the air.