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Consider a two-stage compression refrigeration system operating between the pressure limits of 0.8 and 0.14 MPa. The working fluid is refrigerant-134a. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.4 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure, and it cools the refrigerated space as it vaporizes in the evaporator. Assuming the refrigerant leaves the evaporator as saturated vapor and both compressors are isentropic, determine
(a) the fraction of the refrigerant that evaporates as it is throttled to the flash chamber,
(b) the amount of heat removed from the refrigerated space and the compressor work per unit mass of refrigerant flowing through the condenser, and
(c) the coefficient of performance.
The zebra mussels have a net growth rate of 0.09 yr-1. At the current time there are 176 zebra mussels in the stream. What is the predicted number of zebra mussels 5, 10, and 20 years from now
A local contractor has just bought warehouse and decided to fence in an area of 1152 square feet behind the warehouse.He plans to use the wall of the building as one of the four sides that will enclose the rectangular area.
A manufactory company produces flash drivers and their products include: 1GB (10%), 2GB (10%), 4GB (20%), 8GB (30%), 16GB (20%) and 32GB (10%); in addition, there are four different colors for all the flash drivers
Crates A and B weigh 300 lb and 110 lb, respectively. They are connected together with a cable and placed on the inclined plane. If the angle θ is gradually increased, determine when the crates begin to slide.
Assume that the sewer flow and the stream flow are completely mixed, that the salt is a conservative substance (it does not react), and that the system is at steady state.
It rains 3.0 in. on a 20.0 acre watershed. What is the volume of rainfall excess if 30% of the watershed area is a lake and infiltration on the soil is estimated at 1.0 in. What is the total volume of runoff.
A cylindrical volume of soil contaminated with trichloroethylene (TCE). It is about 2.5 m deep and about 4.0 m in diameter. The porosity of the soil is approximately 0.25.
You are in an old spy movie, and have been locked into a small room (volume 1000 ft). You suddenly realize that a poison gas has just started entering the room through a ventilation duct. Recognizing the type of poison from its smell, you know that i..
Assuming a linear speed-density relationship, the mean free speed is observed to be 60 mph near zero density, and the corresponding jam density is 140 veh/mi.
A pipe line of 1.25 m diameter has a circular gate at its end. This gate can be operated around its horizontal diameter. If the pipe is flowing full with velocity almost equal to zero, calculate the turning moment required to operate the gate
An insulated rigid tank is divided into two equal parts by a partition. Initially, one part contains 4 kg of an ideal gas at 800 kPa and 50°C, and the other part is evacuated.
The power output of the turbine is just 0.1 kW. If the process is adiabatic and steady, what is the required flow rate of air through the turbine if the exit state is 100 kPa and - 53 C.
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