8. Total annual primary energy You want a new gas boiler for your house. The annual space heating demand is 8000 [kWh]. The annual hot tap water demand is 2000 [kWh]. The house is equipped with floor heating using the temperature range 50-30 [OC]. You are buying a condensing boiler with an efficiency of 0.95 in condensing mode and 0.86 in non-condensing mode. What ?is the total annual primary energy [kWh] 11628 [kWh] 10526 [kWh] 10747 [kWh] 9412 O [kWh] 3105

8. Total annual primary energy You want a new gas boiler for your house. The annual space heating demand is 8000 [kWh]. The annual hot tap water demand is 2000 [kWh]. The house is equipped with floor heating using the temperature range 50-30 [OC]. You are buying a condensing boiler with an efficiency of 0.95 in condensing mode and 0.86 in non-condensing mode. What ?is the total annual primary energy [kWh] 11628 [kWh] 10526 [kWh] 10747 [kWh] 9412 O [kWh] 3105

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Revisit Example 6 from your Module 4 notes. Consider the well-insulated, rigid tank having a volume of 10 [ft']. Previously, it contained saturated water vapor at 212°F at state 1. The water was rapidly stirred until the pressure was 20 [lbfin'). In class we showed that the temperature at state 2 was 445°F and the work done during this process was -31.3 (Btu]. Now, if insulation were removed from the tank, and the water is cooled at constant volume from T2 = 445°F to T3= 300°F without stirring the water, determine: a) The pressure at the state 3 in [Ibfin*), and b) The heat transfer during the process in [Btu).
Problem-1 Calculate the efficiency of Carnot heat engine working between high temperature reservoir(source) T1 , and low temperature reservoir (sink) T2, for each case as described in the following table. High temperature reservoir(source) T[K] 1000 Low temperature reservoir(sink) T2[K] Carnot Efficiency,Ncarnot 300 1000 150 1000 100 1000 400 1000 500 1000 600 1000 750 1000 950 1000 999 750 300 600 300 500 300 400 300 300 300 1000 -500
Air at a temperature of 26.85 ° C and a pressure of 200 kPa in a 1 m closed container has. Air at a temperature of 26.85 ° C is generated at 600 K by heat transfer from a reversible heat pump heated up to temperature. The heat pump takes heat from the surrounding environment at a temperature of 300 K. Heat Calculate the amount of work that needs to be supplied to the pump as [kJ].
A power plant condenser diverts from the power plant water that condenses heat at a rate of 34 [MW] The cooling water enters the condenser at a temperature of 15c and leaves at a temperature 3[C] lower than the water's condensation temperature. The pressure of the water at the exit of the turbine is 9[kpa]The condenser is made of brass tubes with an inner diameter of 25mm and an outer diameter of 30mm and the number of tubes in the condenser is 1000 A. Calculate the cooling water flow.B. Calculate the area of the heat exchanger on the condensing side
A refrigeration unit maintains the interior temperature of a walk-in meat locker at a temperature of – 5°C. The rate of heat transfer to the locker from the outside air is 8000 kJ/hr. The air outside the locker is at 22°C. The coefficient of performance [COP] for the actual refrigeration unit is 2.5 to maintain the locker temperature. Assume [3]: пМax [Тн,Tc] %- ВМах [Тн, Тc] - YMax| [TH,Tc] 1. The maximum coefficient of performance [COP] for the refrigeration cycle is equal to а. 2.50 b. 9.93 с. 10.93 d. none of the above. 2. The heat transfer to the locker from the outside air to the locker is equal to а. QNet b. Qc с. Он d. none of the above. 3. The required power input Wactual for the cycle in kJ/hr is 3,200 b. 8,000 с. 20,000 а. d. none of the above. 4. The minimum power input WMin for the cycle in kJ/hr is а. 730 b. 805 с. 3200 d. none of the above. 5. The required power input WActual for a cycle with a COP of 5 in kJ/hr is 1,600 4,000 с. 10,000 d. none of the above. а. b.
An ideal gas with a mass of 2 kg reversibly and polytropically expands up to 3 times its initial volume in a piston-cylinder assembly. The temperature of the ideal gas drops from 300 ° C to 60 ° C. a) The heat energy input is 20 kJ and the boundary work output is 100 kJ. Find the specific heats cv [kJ / kgK] and cp [kJ / kgK] for the gas. b) If the heat energy output is 20 kJ and the boundary work output is 100 kJ, calculate the specific heats of the gas cv [kJ / kgK] and cp [kJ / kgK]. c) Find the value k, which is the ratio of specific heats. d) If the heat energy input is 20 kJ, the boundary work output is 100 kJ and the entropy generation is 0.36 kJ / K, calculate the thermal energy source temperature as [° C].
D-Q-1 Write T for true Statement or F for False Statement. [1]. Heat transfer: is transit mass between the bodies of materials due to the temperature difference [2]. Conduction: is this phenomenon replay to random motion, translational motion, rotational motion and internal vibrational motion of particles. [3]. The thermal diffusivity represents how fast heat diffuses through a material [4]. A material that has a low thermal conductivity or a low heat capacity will have a large thermal diffusivity. [5]. Heat transfer by radiation does not require the presence of an intervening medium. Convection is the mode of energy transfer between a solid surface and the adjacent liquid or gas that is in motion [6]. [7]. Conduction: is cold transfer from the higher particles activity to lower activity due to the temperature difference [8]. The larger the thermal diffusivity, the non-faster the propagation of heat into the medium [9]. The convection heat transfer coefficient in W/m. [10]. he rate of…
D-Q-1 Write T for true Statement or F for False Statement. [1]. Heat transfer: is transit mass between the bodies of materials due to the temperature difference [2]. Conduction: is this phenomenon replay to random motion, translational motion, rotational motion and internal vibrational motion of particles. [3]. The thermal diffusivity represents how fast heat diffuses through a material [4]. A material that has a low thermal conductivity or a low heat capacity will have a large thermal diffusivity. [5]. Heat transfer by radiation does not require the presence of an intervening medium. Convection is the mode of energy transfer between a solid surface and the adjacent liquid or gas that is in motion [6]. [7]. Conduction: is cold transfer from the higher particles activity to lower activity due to the temperature difference [8]. The larger the thermal diffusivity, the non-faster the propagation of heat into the medium [9]. The convection heat transfer coefficient in W/m. [10]. he rate of…
Heat pump .11 A building owner wants to apply a heat pump in his building. It has already been decided that the building will have a central heating system. He wants to choose the most energy efficient combination of options. Which combination of the following options will lead to the highest SCOP? (Note: multiple answers possible) Radiators using the range 40-60 [OC] Floor heating using the range 30- 45 [OC] A ground source heat pump An outdoor air heat pump
In order to fnd the specifc heat c of an unknown substance, you place 75 g of the substance in a 30 g copper calorimeter that contains 65 g of water, all initially at 20 °C. You then add 100 g of water at 80 °C, and measure the fnal temperature of the system to be 49 °C. Assuming no heat is lost to the environment, what is c? [Answer: c = 2200 J/kg. K] 즈
the water level in a PWR must always be above the top of the active core. a. Estimate the decay heat at the time of scram of a 1,200 MWe reactor. b. Calculate the boiloff rate [kg/hr] if the coolant were saturated at 2200 psi for this decay heat rate. The area of the core occupied by water is 55 ft2 c. Calculate the rate at which the water level would decrease for this boiloff rate [cm/s]. d. What is the importance of keeping the core covered?
Consider a compressor which is adiabatic. At the inlet of the compressor the temperature is 380 K and pressure is 130 kPa and the air passes at the rate of 1 kg/s. At the exit of the compressor the temperature is 530 K and pressure is 785.7 kPa. Find the volumetric flow rate of air at the exit [m/s] and also, power consumed by the compressor [kW]. Assumptions. Steady state process. Kinetic and potential energy changes are negligible. Air is an ideal gas with variable specific heats.