The recovery time of a hot water heater is the time required to heat all the...
The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 47-gal (1.00 gal = 3.79 x 10-3 m3) unit starts with cold water at 11 °C and delivers hot water at 53 °C. The unit is electric and utilizes a resistance heater (120 V ac, 3.9 Ω) to heat the water. Assuming that no heat is lost to the environment, determine the recovery time (in hours) of the unit.
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The recovery time of a hot water heater is the time required to
heat all the...
A physics student uses a 115.00 V immersion heater to heat 330.00 grams of water for...
A physics student uses a 115.00 V immersion heater to heat 330.00 grams of water for herbal tea. During the two minutes it takes the water to heat, the physics student becomes bored and decides to figure out the resistance of the heater. The student starts with the assumption that the water is initially at the temperature of the room Ti = 25.00°C and reaches Tf = 100.00°C.The specific heat of the water is c = 4180 J/(kg · °C)....
A water heater consists of a copper tube that carries water through hot gas in a...
A water heater consists of a copper tube that carries water through hot gas in a furnace, as shown in Fig. 1. hot gas at T, = 500° th=0.033 inch h, = 25 W/m2K Poytube = 0.25 inch water at Tv = 30° h = 500 W/m2K kube= 300 W/m-K Figure 1: Copper tube in a water heater. The copper tube has an outer radius, ro,tube = 0.25 inch and a tube wall thickness of th=0.033 inch. The conductivity of...
Q2. Solar flat plate water heater is shown below. Solar collector Controller Hot water to the...
Q2. Solar flat plate water heater is shown below. Solar collector Controller Hot water to the tap Tank t Cold water food Pump (a) What is the principle on which the solar collector works? Explain. (1.5 marks) (b) What is the principle on which the heat exchanger works? Explain. (1.5 marks) Q3.(a) The wavelength of radio waves is 200 m & its speed iſs 3x108m/s in free space. (1) Find the frequency of the radio waves in space? (1.5 marks)...
#2 Problem 1: (A) Hot water at a rate of 0.2 Liter/s passing through a gas...
#2
Problem 1: (A) Hot water at a rate of 0.2 Liter/s passing through a gas wall-mount heater placed upstream in the basement and heats the water from 5°C to a 60°C for a shower. Taking the density o water to be 1 kg/L, determine the total heat added in the heater. (25 points) -5℃ T イ1.60℃ water is in subcooled in the streami -ue.oon KJ/S is volume flow rate (m'/s) & is mass flow rate (kg/s) v2 for each...
A bathtub holds 135 L of hot water at 41.0°C. Cold water at 13.0°C is added...
A bathtub holds 135 L of hot water at 41.0°C. Cold water at 13.0°C is added to the bathtub until the water reaches a final equilibrium temperature of 38.5°C. Assuming only a negligible amount of energy is exchanged between the water and its environment during this time, determine the volume in liters (L) of the added cold water. The specific heat of water is 4.19 ✕ 103 J/(kg · °C) and its density is ρ = 1.00 kg/L. What is...
You have purchased a portable resistive water heater, consisting of a resistor R = 3.5 Ω...
You have purchased a portable resistive water heater, consisting of a resistor R = 3.5 Ω connected to a 12 V outlet in your car. On a cold-weather camp-out you want to warm up some water that has been left out over night for your morning tea. Assume the water is in an insulated cup so no heat is lost to the surroundings. You end up with 0.75 L of liquid water at a final temperature of 65 oC. How...
The same housemate that used all your hot water turned on your backyard grill and left...
The same housemate that used all your hot water turned on your backyard grill and left it on until the propane tank was empty. Assuming that you initially had a full tank of propane (5 gallons), what was the gross heat released from burning all of the propane? Propane (CsH.) has a standard enthalpy of -103.8 kJ/mol and a density of 4.23 lb/gal. See lecture notes for other standard enthalpy constants. Expert Q&A + e to wait to take water...
a hot stream is cooled by cooling water in a counter current heat exchanger propose a feedback control and sketch a sch...
a hot stream is cooled by cooling water in a counter current
heat exchanger propose a feedback control and sketch a schematic
diagram
CONSULT APPENDIX WHERE APPROPRIATE shot stream is cooled by cooling water in a counter current heat exchanger ents as shown in Figure Q1. we, Te2 Heat exchanger Figure Q1. Heat exchanger It is desired to control the exit temperature (Tha) of the hot stream. All flow rates can be measured and manipulated. (a) Propose a feedback control...
#3 PRE-LAB 1. Define Heat capacity - The amount of neat supplied to a given mass...
#3
PRE-LAB 1. Define Heat capacity - The amount of neat supplied to a given mass of material to produce unit change in temperature units = or to b. Specific heat - the amant of heat supplied to one unit mass of substance in order to raise the temperature by one Unit Units of specific heat is you or gik 2. In an experiment to determine the heat capacity of a Styrofoam cup calorimeter, 50 ml of water at 47...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assum...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
A water heater consists of a copper tube that carries water through hot gas in a furnace, as shown in Fig. 1. hot gas at T, = 500° th=0.033 inch h, = 25 W/m2K Poytube = 0.25 inch water at Tv = 30° h = 500 W/m2K kube= 300 W/m-K Figure 1: Copper tube in a water heater. The copper tube has an outer radius, ro,tube = 0.25 inch and a tube wall thickness of th=0.033 inch. The conductivity of...
Q2. Solar flat plate water heater is shown below. Solar collector Controller Hot water to the tap Tank t Cold water food Pump (a) What is the principle on which the solar collector works? Explain. (1.5 marks) (b) What is the principle on which the heat exchanger works? Explain. (1.5 marks) Q3.(a) The wavelength of radio waves is 200 m & its speed iſs 3x108m/s in free space. (1) Find the frequency of the radio waves in space? (1.5 marks)...
#2
Problem 1: (A) Hot water at a rate of 0.2 Liter/s passing through a gas wall-mount heater placed upstream in the basement and heats the water from 5°C to a 60°C for a shower. Taking the density o water to be 1 kg/L, determine the total heat added in the heater. (25 points) -5℃ T イ1.60℃ water is in subcooled in the streami -ue.oon KJ/S is volume flow rate (m'/s) & is mass flow rate (kg/s) v2 for each...
The same housemate that used all your hot water turned on your backyard grill and left it on until the propane tank was empty. Assuming that you initially had a full tank of propane (5 gallons), what was the gross heat released from burning all of the propane? Propane (CsH.) has a standard enthalpy of -103.8 kJ/mol and a density of 4.23 lb/gal. See lecture notes for other standard enthalpy constants. Expert Q&A + e to wait to take water...
a hot stream is cooled by cooling water in a counter current
heat exchanger propose a feedback control and sketch a schematic
diagram
CONSULT APPENDIX WHERE APPROPRIATE shot stream is cooled by cooling water in a counter current heat exchanger ents as shown in Figure Q1. we, Te2 Heat exchanger Figure Q1. Heat exchanger It is desired to control the exit temperature (Tha) of the hot stream. All flow rates can be measured and manipulated. (a) Propose a feedback control...
#3
PRE-LAB 1. Define Heat capacity - The amount of neat supplied to a given mass of material to produce unit change in temperature units = or to b. Specific heat - the amant of heat supplied to one unit mass of substance in order to raise the temperature by one Unit Units of specific heat is you or gik 2. In an experiment to determine the heat capacity of a Styrofoam cup calorimeter, 50 ml of water at 47...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
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