Which is the example of heat sink? Select one: O a. combustion chamber O b. Boiler O c. river O d. Nuclear Reactor
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Q: QUESTION 54 An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its…
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- a. Explain the principle of operation of geothermal heat pump depicted in the Figure below. Geothermal Heat Pump (heating, cooling. domestic hot water) Ground loop - plastic pipe in drill hole b. Explain how the solar water heater (s@ picture a) and the solar oven (see picture b) operate. Cool Collector Hot Hot water Warm water storage Cool Cold water a) b)Module 4 Heating Effect of Electric CurrentHow long will it take to raise the temperature of 880 gm of water from 16ºC to boiling point ? The heater takes 2 amperes at 220 V and its efficiency is 90%.a.11.26 minc.13.08 min b.12.56 mind.14.05 min ____ 13. An electric kettle is required to raise the temperature of 2 kg of water from 20ºC to 100ºC in 15 minutes. Calculate the resistance of the heating element if the kettle is to be used on a 240 volts supply. Assume the efficiency of the kettle to be 80%.a.72 ohmsc.83 ohms b.62 ohmsd.93 ohmsWhat is the total required heating energy in raising the temperature of a given amount of water when the energy supplied is 1000 kwh with heat losses of 25% ?* Choice: A. 1000 B. 1500 C. 1333 D. 1250
- Question 1 Benifits of Building Energy Management System (BEMS) Provide energy analysis and management information Optimise plant operations and services O All of the options O Monitor plant status and environmental conditions O Switch plant on and off automaticallyQ3) give the short answer for the questions below; a) Growth the frost over evaporator surface lead to decrease freezer temperature. b) Using copper tube type-k in the shell and tube heat exchanger c) Make a vacuum pressure for the vapour compression cycle (refrigeration system) before charging with refrigerant (give the value of vacuum pressure) d) Age of compressor depending on the number of turn-on and turn- off, not depended on the working time. e) Skin type condenser favorite more than other type of static condenser in the chest freeze f) Draw the relationship between time and difference temperature for the conventional refrigerator cycle control and inverter refrigerator electrical behavior control.principle of Inverter air conditioner and energy saving.
- O a. None of these O b. Absolute pressures and heat capacity ratio O C. Absolute pressures and temperatures O d. Gauge pressures and temperatures In perfect gas law experiment, the pressure pump coupling is used to connect the vacuum vessel to the pump discharge connector. Select one: O a. False O b. True Which part in the mechanical heat pump is used to reduce the refrigerant pnessule? Select one:I need help with some or all of this problem for thermo! thank you A heat engine with a thermal efficiency of 45% rejects 1000 kJ/kg of heat to a low temperature sink. a. How much heat does it receive (kJ/kg)? b. How much work does it produce (kJ/kg)? c. If the cycle operates between temperatures of 400°C and 50°C, what is the maximum amount of work that this cycle can produce (kJ/kg)? d. A Carnot heat pump operates between 273 K and 313 K, determine its Coefficient of Performance.f) Differentiate Fire tube boilers and Water tube boilers.
- Answer the following: A.) What is the significance of using multiple feedwater heaters? (Write your reference) B.)What is the difference of using multiple feedwater heaters and using only one feedwater heater with their efficiency of cycle? C.) State other things/ways to increase efficiency of a cycle, other than using multiple feedwater heaters.1- What is the pressure at the Economizer (in bar)? 2- What is the pressure at the Evaporator (in bar)? 3- How much heat received by the Economizer (kW)? 4- How much heat received by the Evaporator (kW)? 5- How much heat received by the Superheater (kW)? 6- How much heat received by the FWH (KW)?.. 7- How much heat received from the fuel burning (kW)? 8- How much heat rejected at the chimney (kW)?. T=35 C From the Pump m-1.3 kg/s + Cpw=4.2 kJ/kg.C ****************** T=150 C, To the Turbine Cp 1.008kJ/kg.K T=400C 44 T=212.2 X=0.0 X=0.85 Chimney Hoo bou to Economizer Evaporator Super Heater -Air, m-4 kg/s, T=20 C P=5 bar, X=0.8, m=0.3 kg/s from FWH X=1 1 Fuel, T-20 C, m=0.2 kg/s, C.V=33.5 MJ/kg BumerWhat exists in a steam boiler operation?a. there is a local equilibriumb. convection heat exchange is the main mechanism of heat transferc. generation of kinetic energy of turbulence and rate of dissipation are not the samed. supersaturation temperature of water is achieved