2. (L18-20, L24-26) Consider the refrigerator analyzed in class with an air-cooled condenser (see...
An air-conditioner with air-cooled evaporator costs $50,000. With EER of 2.16 kcal/h W it is estimated to use 140 kWh of electricity daily on an average day requiring cooling. Similarly, a new type of air-conditioner employing evaporative cooling condenser costs $120,000. The EER of this air-conditioner is 4.66 kcal/h W and is estimated to use 75 kWh of electricity and 750 liters of water daily on an average day requiring cooling. The former air-conditioner would have a useful life of...
please show work thank you An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (NL=NT-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of SL-60 mm and ST = 63 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of Ts=390 K may be assumed to be maintained as condensation occurs within the tubes....
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (N N-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of s 60 mm and sr 84 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of T,-390 K may be assumed to be maintained as condensation occurs tudy ithin the tubes. (a)...
5-111 Consider a refrigerator whose outer dimensions are 1.80 m x 0.8 m × 0.7 m. The walls of the refrigerator are constructed of 3-cm-thick urethane insulation (k = 0.026 W m K and α = 0.36 × 10-6 m2/s) sandwiched between two layers of sheet metal with negligible thickness. The refrigerated space is maintained at 3°C and the average heat transfer coefficients at the inner and outer surfaces of the wall are 6 W/m2 K and 9 W/m2.K, respectively....
QUESTION 2 [20 Marks] An air conditioned room that stands on a well ventılated basement measures 3 m wide high and 6 m deep One of the two 3 m walls faces west and contains a do window of sıze 1 5 m by 1 5 m, mounted flush with the wall with no external s shading T the follo are no heat gains through the walls other than the one facing east From nformation Inside conditions 25 °C dry...
A. A rigid tank contains a hot fluid that is cooled while being stirred by a paddle wheel. Initially, the internal energy of the fluid is 800 kJ. During the cooling process, the fluid loses 500 kJ of work on the fluid. Determine the final internal energy of the fluid. Neglect the energy stored in the paddle wheel. B. Determine the power required for a 2000 kg car to climb a 100 m long uphill road with a slope of...
Question 2 A vapour compression cycle acts as both a heat source (radiators and a hot water load) and a cooling load (food preservation). The system requires an operating temperature of 50°C to support the bulk of the heating load and -10°C for the cooling load. a) Determine the operating pressures of the cycle in bar. Also, assuming we require a maximum temperature of 90°C to operate certain higher temperature heat processes (for hygiene related reasons), determine the enthalpy at...
This is for static air don't just copy from others', this is a different problem. 1. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500 K. The cylinder is left to cool in a large room of static air at 300 K. Calculate a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is 500 K, and 10] 15]...
1. Is the floe within the pipe turbulent or laminar? Justify your answer 2. What is the average Nusselt number and heat transfer coefficient in the pipe? You can assume that the flow is fully developed 3. What length of pipe is required to achieve the desired exit temperature? 4. Was your assumption of fully developed flow justified? Explain why or why not. How much error did this assumption introduce into calculation of nusselt number? Do you need more or...
Combined cycle power plants are common because of their high efficiency and scalability. They typically combine a gas turbine cycle (the Brayton Cycle) with a steam turbine cycle (the Rankine Cycle) [1]. The goal of this project is to determine the operating efficiency and profitability of a realistic combined cycle power plant. The power plant is as follows: 1. A natural gas-fired Brayton cycle with mÛ air,Br = 1.25 kg s−1 . (a) Ambient air at 1 bar and 300...