FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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A bio-reactor must be kept at 42°C by a heat pump driven by a 3 kW motor. The reactor has a heat loss of 12 kW to the ambient at 15°C. What is the minimum COP that will be acceptable for the heat pump?
Find the COP of heat pump operating between 1000K and 300K
A heat engine operates between 500 C and 30 C. It takes in 12,000 J and does 3000 J of work.
a. How much heat is transferred to the environment?
b. What is the average efficiency?
c. What is the Carnot efficiency?
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- A carnot heat pump is operating to keep a room at 20C. The unit is taking in air from a -30C location. If it is pulling 5kW from the -30C location, what is the power input required to do this and how much heat is delivered to the 20C room?arrow_forwardSolve it fastarrow_forwardNote: Use the relevant chart for each problem.in addition to having the solution on a piece of paper Q2/ A refrigeration system operates according to reversed Carnot cycle, low temperature is -40 °C and the work done is 1.2 kW/TR. Find; the coefficient of performance as refrigerator and heat pump, absorbed heat and rejected heat.arrow_forward
- 42. Water enters the cooling tower at 50°C and leaves at 28°C while the heat rejected to air is 100 KW. Find the capacity of the pump needed to pump the water. A. 1.08 li/s B. 3.22 li/s C. 2.34 li/s D. 4.23 li/sarrow_forwardSuppose a certain heat engine has an efficiency of 35%. Heat in In order for this heat engine to do 420 J of useful work, how much energy must be taken in as heat from the high- temperature reservoir? 780 J Work 420 J 12 J 150 J 1620 J 1200 J Heat out O O Oarrow_forward1. Calculate the change in energy for the tollowing processes. Identify it the process is endothermic or exothermic. a. A gas releases 35 Jof heat as 84 klojoules was done to compress t. b. A gas absorbs 48 J of heat as it does 72 J of work by expanding. SCHOarrow_forward
- Thermodynamics (Carnot Cycle) An Ocean Thermal Energy Conversion (OTEC) power plant produces 25000 kW of ouput using warm surface water temperature of 29°C and a cold deep-water temperature of 12°C. Assume it is a carnot cycle and density of cold water to be 1000 kg/m3. Calculate the heat rejected in kW. Options: a. 920000 b. 720000 c. 120000 d. 420000 e. 820000 f. 320000 g. 520000 h. 220000 i. 620000arrow_forwardHeat is transferred to a heat engine from a fumace at a rate of 120KW. If the rate of waste heat rejection to a nearby river is 50000W. Find the net Power output and the thermal efficiency for this heat engine.arrow_forwardA refrigeration system is used to cool water in the evaporator an 8 kg/s of water from 30C to 2C. Find the tons of refrigeration required.arrow_forward
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