Compare an SHS with a solid storage material and an LHS with a PCM storage material. The thermal capacity of energy storage system is a  capacity of 600 kWh. The properties of storage media are density of the SHS medium is 2400 kg/m3 and its specific heat is 1 kJ/kg K, density of the PCM medium is 1808 kg/m3, fusion enthalpy is 212 kJ/kg, and its specific heat is 1.8 kJ/kg K. The storage medium temperature variation ΔT in the TES system is 60 K. Determine for both storage systems (a) the storage energy density and (b) the mass and volume of storage medium.

Q4. Electric heater wires are installed in a solid wall having a thickness of 8 cm and k=2.5W/m. Cº. The right face is exposed to an environment with h-50W/m². Cº and T% =30C°, while the left face is exposed to h=75W/m². C° and Too =50C°. What is the maximum allowable heat-generation rate such that the maximum temperature in the solid does not exceed 300-C? Not a2T (BEST WISHES)

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The energy required to heat a 50m^2 living area in Canberra is of 18738 MJ per year.Assume the external air temperature in Canberra is 6℃, while the desired internal airtemperature is 19℃.The living area can be heated by electric element heater (assume it convert 100% ofelectricity into heat), by heat pump operating between the external and internal airtemperatures with coefficient of performance 3.0 and by a reversible heat pump operatingbetween the same temperatures. Consider for the electricity the cost of 22 cents per kWh.Question:(a) Determine the annual cost of heating the living area with the three systems above.(b) Determine for the two heat pumps the amount of energy per year received from theexternal air.

Steam at 140 ° C flows in a pipe having an inner radius of 50 mm and an outer radius of 55 mm. The convective heat transfer coefficient between the steam and the inner pipe wall is 2500 W / (m² ° C). The outer surface of the pipe exposed to ambient air is 20 ° C with a convective heat transfer coefficient of 10 W / (m² ° C). Assuming steady state, calculate the rate of heat transfer per meter of pipe from steam to air. Assume that the thermal conductivity of stainless steel is 15 W / (m ° C.). Steps of work according to example 4.16 Singh. a. Find the overall heat transfer coefficient = Answer W / m² ° C. b. Heat transfer rate per meter of pipe = Answer W / m.

A solar collector absorbed 40 W/m2 heat from the atmosphere. This is equal to the convection brought by air for drying purpose. If the temperature of the air is 40°C while the solar collector area's temperature is 80°C and neglecting effect of radiation, find the convective heat transfer coefficient.

Provide clear/complete (step by step ) solution as well as a diagram for this problem.  The thermodynamic efficiency of a heat engine that rejects heat at a rate of 20 MW when heatis supplied to it at a rate of 60 MW is: A. 33.3%       B. 50%     C. 66.7%          D. 75% Answer: C

A pellet stove used for residential heating produces 8,000 BTUs per hour and is 80% efficient. If over the course of a year, the pellet stove has a 0.37 capacity factor, how many cords of wood were burned over the course of that year? Assume that wood has an energy density of 16MJ/kg and that a cord of wood weight approximately 3,000 lbs. Please show your work.

Describe the heat and work are energy transfer mechanisms between a system and its surroundings, and there are many similarities between them?

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