An evaporation lagoon with area of 465m^2 is to be kept at a temperature of 40C...
An evaporation lagoon with area of 465m^2 is to be kept at a temperature of 40C by a heat pump. Assuming an air temperature of 25C and a wind speed of 6m/s what is the energy required to maintain the required temperature?
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An evaporation lagoon with area of 465m^2 is to be kept at a
temperature of 40C...
A small, enclosed evaporation lagoon is to be created with water misters to increase surface area,...
A small, enclosed evaporation lagoon is to be created with water misters to increase surface area, a fan to increase airflow over the lagoon and a heat pump. Would greater evaporation take place if the heat pump was providing the same amount of heat to the air in the lagoon enclosure rather than to the water through the sprayers?
Calculate by the energy balance method the evaporation rate in [mm day] from an open water surface, if the net radiation is 225[Wrm] and the air temperature 22°C, assuming no sensible heat or ground...
Calculate by the energy balance method the evaporation rate in [mm day] from an open water surface, if the net radiation is 225[Wrm] and the air temperature 22°C, assuming no sensible heat or ground heat flux, the water density is 997 kg/m, and the latent heat Jkgl2.501x10-2370T where Temperature T is in [C]. Is your estimation reasonable in reality? [15pt]
Calculate by the energy balance method the evaporation rate in [mm day] from an open water surface, if the net...
3. The temperature and relative humidity average for the month of March have the following values:...
3. The temperature and relative humidity average for the month of March have the following values: Monthly average mean air temperature at 4m-7.2 °C Monthly average maximum, lake temperature-4.4°C Monthly average maximum pan temperature 5.5 oC Monthly average relative humidity-70% During the month, the evaporation measured from the pan was 1.3 cm. Determine the monthly evaporation from the reservoir by a. The simple formula, assuming that K-0.68 b. The revised formula, assuming that K'-1.5 4. Solve #3 using the aerodynamic...
2. A heat pump is operated to maintain a home at 25 °C when the outside temperature is only -5 °C...
2. A heat pump is operated to maintain a home at 25 °C when the outside temperature is only -5 °C. (a) If the house requires 50 kW heat, what is the power required for the heat pump? Assume the heat pump to be a Carnot heat pump (b) If an electric heater was used for this purpose instead, assuming an electric current of 5A, what would be the required resistance of the heater? (c) If electricity costs 10 cents...
A window of a house has an area of 2.0m^2 s and a thickness of 5mm....
A window of a house has an area of 2.0m^2 s and a thickness of 5mm. The temperature inside the house is 25c and the temperature outside the house is 6c. at what rate is heat being lost through the window by conduction?
Wind speed 10 m Air Temperature Surface Temperature 10 m Specific Humidity 9a Surface Spec Humidi...
Wind speed 10 m Air Temperature Surface Temperature 10 m Specific Humidity 9a Surface Spec Humidity9 . Calculate the solar insolation at 12h00 noon assuming the season is winter eg. 21 December and the latitude is 18°N (at Puerto Rico), with the equation: 5 m/s 22 С 26 C 15 g/kg 20 g/kg Ta Ts Qs-(sin(d)(S) (insolation fraction) where S is the solar constant 1370 W m-2 d is the sun angle (90 deg latitude -season), and dividing for time...
Consider two walls, each kept at constant temperature T. and joining them is an aluminum fin...
Consider two walls, each kept at constant temperature T. and joining them is an aluminum fin of length L. There is internal heat generation q in this fin. Air flows over the fin having convective heat transfer coefficient h and temperature T.. Prove that the efficiency of the fin can be given by tanh (mL/2) mL/2 where m2 P= perimeter of the fin, A = area of the fin cross-section, and k = thermal conductivity of the fin. n =...
On a windy day, we can define the wind-chill temperature Twc as the air temperature that...
On a windy day, we can define the wind-chill temperature Twc as the air temperature that would give the same rate of heat loss if experienced on a calm day. Consider a day when the air temperature is 2°C and the wind speed is 12 m/s, giving a convective heat transfer coefficient of 45 W/m2⋅K (compared with 10 W/m2⋅K on a calm day). Assume a person has a 3 mm layer of skin (k = 0.37 W/m⋅K), a body surface...
The available power in a stream of wind of the same cross-sectional area as the wind...
The available power in a stream of wind of the same cross-sectional area as the wind turbine can easily be shown to be Available power in watts P pU3 Td where U is the wind speed in m/s p is the density of air in kg/m d is the rotor diameter in m - a. If the temperature is 0°C, and the air density p at 0°C is 1.2754 kg/m', the available power is 225 kW, and the wind speed...
2. Determine the water evaporation for the month of August for a reservoir using the data...
2. Determine the water evaporation for the month of August for a reservoir using the data from the attached table. (Hint: Determine the monthly average values first, then use the average monthly values in the model to determine the evaporation for the month. Do not use missing data when calculating average values.) Assume a short vegetation height (0.1 feet) over the reservoir when using the wind model. [Answer: e =0.621 in Hg; ed =0.506 in Hg; Evaporation=2.18 inches for the...
Calculate by the energy balance method the evaporation rate in [mm day] from an open water surface, if the net radiation is 225[Wrm] and the air temperature 22°C, assuming no sensible heat or ground heat flux, the water density is 997 kg/m, and the latent heat Jkgl2.501x10-2370T where Temperature T is in [C]. Is your estimation reasonable in reality? [15pt]
Calculate by the energy balance method the evaporation rate in [mm day] from an open water surface, if the net...
3. The temperature and relative humidity average for the month of March have the following values: Monthly average mean air temperature at 4m-7.2 °C Monthly average maximum, lake temperature-4.4°C Monthly average maximum pan temperature 5.5 oC Monthly average relative humidity-70% During the month, the evaporation measured from the pan was 1.3 cm. Determine the monthly evaporation from the reservoir by a. The simple formula, assuming that K-0.68 b. The revised formula, assuming that K'-1.5 4. Solve #3 using the aerodynamic...
2. A heat pump is operated to maintain a home at 25 °C when the outside temperature is only -5 °C. (a) If the house requires 50 kW heat, what is the power required for the heat pump? Assume the heat pump to be a Carnot heat pump (b) If an electric heater was used for this purpose instead, assuming an electric current of 5A, what would be the required resistance of the heater? (c) If electricity costs 10 cents...
Wind speed 10 m Air Temperature Surface Temperature 10 m Specific Humidity 9a Surface Spec Humidity9 . Calculate the solar insolation at 12h00 noon assuming the season is winter eg. 21 December and the latitude is 18°N (at Puerto Rico), with the equation: 5 m/s 22 С 26 C 15 g/kg 20 g/kg Ta Ts Qs-(sin(d)(S) (insolation fraction) where S is the solar constant 1370 W m-2 d is the sun angle (90 deg latitude -season), and dividing for time...
Consider two walls, each kept at constant temperature T. and joining them is an aluminum fin of length L. There is internal heat generation q in this fin. Air flows over the fin having convective heat transfer coefficient h and temperature T.. Prove that the efficiency of the fin can be given by tanh (mL/2) mL/2 where m2 P= perimeter of the fin, A = area of the fin cross-section, and k = thermal conductivity of the fin. n =...
The available power in a stream of wind of the same cross-sectional area as the wind turbine can easily be shown to be Available power in watts P pU3 Td where U is the wind speed in m/s p is the density of air in kg/m d is the rotor diameter in m - a. If the temperature is 0°C, and the air density p at 0°C is 1.2754 kg/m', the available power is 225 kW, and the wind speed...
2. Determine the water evaporation for the month of August for a reservoir using the data from the attached table. (Hint: Determine the monthly average values first, then use the average monthly values in the model to determine the evaporation for the month. Do not use missing data when calculating average values.) Assume a short vegetation height (0.1 feet) over the reservoir when using the wind model. [Answer: e =0.621 in Hg; ed =0.506 in Hg; Evaporation=2.18 inches for the...
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