Level 2: Develop Models Draw a model that explains how Enhanced Geothermal Systems (EGS) works to extract geothermal heat from an area without hydrothermal vents.
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- 1. What are the types of boiler in terms of: a) axis of boiler, b) fire, c) pressure of boiler, d) circulation of water, e) circulation of gases.(b) After graduation, you decided to work overseas to experience living in a country with four seasons. Your neighbour, knowing that you are an engineer asked your help to install a heat pump system for his house. He wanted to always maintain the temperature in his house at 24°C during winter. In that area during winters, average outside temperature is -3°C. He also has an underground water well with average water temperature of 10°C during winter. You estimated that the heat losses from the house under the average outside temperature to be 75000 kJh. Investigate the most economical mean to power the heat pump (by calculating the minimum power required) if you can choose to extract heat from either: i. The outside air at average temperature of -3°c ii. The well water at 10°C State the reasoning for your calculations.In an absorption refrigerator, the energy driving the process is sllPplied not as work, but as heat from a gas flame. (Such refrigerators commonly use propane as fuel, and are used in locations where electricity is unavailable. *) Let us define the following symbols, all taken to be positive by definition: Qf = heat input from flame Qe = heat extracted from inside refrigerator Qr = waste heat expelled to room Tf = temperature of flame Te temperature inside refrigerator Tr = room temperature Use the second law of thermodynamics to derive an upper limit on the COP, in terms of the temperatures Tf, Te, and Tr alone.
- In an absorption refrigerator, the energy driving the process is sllPplied not as work, but as heat from a gas flame. (Such refrigerators commonly use propane as fuel, and are used in locations where electricity is unavailable. *) Let us define the following symbols, all taken to be positive by definition: Qf = heat input from flame Qe = heat extracted from inside refrigerator Qr = waste heat expelled to room Tf = temperature of flame Te temperature inside refrigerator Tr = room temperature Explain why the "coefficient of performance" (COP) for an absorption refrigerator should be defined as Qc/Qf.State if the listed statement is Ture (T) or False (F) and correct the false statement: 1. Thermodynamic is a science of energy 2. Closed system is also called control volume 3. Steam power plant cycle is employed to produce a mechanical and electrical energy 4. In a Carnot cycle, the isothermal process in a boiler and a condenser ( ) 5. Isobaric process means volume is constant 6. Isentropic process means adiabatic and reversible 7. Pump is a device that consumes energy 8. Compressor is a device that raises a pressure of incompressible fluid flow ( ) 9. Thermal efficiency means the output by input 10. Cycle means a group of process that has initial state and final state ( ) ( )Goal Solve for the efficiency of a heat engine using a five-step process the includes:1. Making a state table.2. Making a process table.3. Calculating the totals for Work, Heat, and Internal-Energy-Change.4. Identifying the heat input (hot reservoir) and output (cold reservoir).5. Calculating the efficiency of the engine.Problem Shown in the figure to the right is a cyclic process undergone by a heat engine. Your heat engine shall use 7.0 moles of nitrogen gas (diatomic). During the process a->b, the pressure rises by a factor of 2.0. solution- (1) Fill in the State Table (all pressures in Pascals, all volumes in cubic meters, all temperatures in K). Pressure Volume Temperature a b c (2) Fill in the Process Table (all entries in Joules). Work Heat dU a->b b->c c->a (3) Find the Totals: Work = J Heat = J dU = J (4) Find the heat input (from "hot reservoir") and the heat output (to…
- A group is considering installing a solar power station and has asked you for your recommendation if it should be a photovoltaic system or a solar thermal system. At this stage you are asked not to include cost factors. The single point design condition they have given you is for an incident solar radiation on the collector of 550 W/m2, a surrounding temperature of 18 C. The dead state for this problem should be taken as To = 291 K, Po = 1 bar. You can perform your analysis at steady state conditions. In addition to determining the power output and first law efficiency of the options, you have been requested to determine the exergy destroyed for each of them. The photovoltaic system has an efficiency of 0.15 defined as the power output/incident solar radiation. The basic photovoltaic collector is 1.1 m2 and losses heat from both the front and back surface. The edge area can be neglected. The convective heat transfer coefficient is 10 W/m2 K. The inverter and signal…A group is considering installing a solar power station and has asked you for your recommendation if it should be a photovoltaic system or a solar thermal system. At this stage you are asked not to include cost factors. The single point design condition they have given you is for an incident solar radiation on the collector of 550 W/m2, a surrounding temperature of 18 C. The dead state for this problem should be taken as To = 291 K, Po = 1 bar. You can perform your analysis at steady state conditions. In addition to determining the power output and first law efficiency of the options, you have been requested to determine the exergy destroyed for each of them. The photovoltaic system has an efficiency of 0.15 defined as the power output/incident solar radiation. The basic photovoltaic collector is 1.1 m2 and losses heat from both the front and back surface. The edge area can be neglected. The convective heat transfer coefficient is 10 W/m2 K. The inverter and signal conditioning…A house is heated and maintained at 20 °C by a heat pump. Part A Part B Based on these results, would you recommend heat pumps at locations with a severe climate? Match the words in the left column to the appropriate blankes in the sentences on the right. Reset Help mild 1. Given that a real heat pump is significantly efficient than a Carnot heat pump, the increases advantage of a heat pump over electric heating rapidly when the outside temperature becomes really low. less more 2. As the COP decreases, the heating power decreases 3. A heat pump is ideal for a climate. severe Submit Request Answer
- Question 2. A household with electric resistance heating plans to switch from resistive heating to a ground source heat pump. Annual heat consumption of the house is 30 000 kWh. Investment cost of the heat pump is 21 000 €. Heat pumps COP is 4.0. How much are the annual savings compared to resistive heating after the change of the heating system (in kWh)? Average price of electricity is assumed to be 12 c/kWh. Round off your answer to one decimal digit and enter it without the unit.Topic: Understanding the World of Thermodynamics 1.) Give an example each of an isolated, closed and an open systems. Explain how you classified the systems.A conference hall is to be i at 24 C dry bulb and 60 %RH. The estimated cooling loads are 75 tons and 25 tons sensible loads and latent loads, respectively. If cooled air from Air Handling Unit (AHU) is supplied to the hall at 15 C, determine the following below & plot the process on the Psychrometric chart. a) room sensible heat factor (RSHF) b) Bypass Factor (BPF) of the cooling coil c) the cubic per minute (CFM) needed to maintain the hall at its comfortable state at 24 C dry bulb and 60 %RH?