Question

Добрый вечер! Кто-нибудь поможет мне решить задачу по физике?)Нагреватель мощностью 50 кВт повышает температуру воды, протекающей со скоростью 1 м/с по трубе диаметром 2 см, с 15 до 35 градусов Цельсия. Какая часть количества теплоты выделяемой нагревателем передается окружающей среде?

Answer 1

Gв = Wв*3,14*Ртрубы*Ртрубы*ржид = 1м/с*3,14*0,01м*0,01м*1000кг/м^3=0,314кг/секунду.
теплоемкость воды Ср=4,19 кДж/(кг*К)
нагреваем воду с 15 до 35 градусов, следовательно:
дельта т=т2-т1=35-15=20гр.
количество энегрии переданной воде будет равно:
Q=Ср*G*дельта т = 4,19*0,314*20=26,31кДж/секунду=26,31кВт
50 - 26.31 = 23.68 кВт. ( отдаётся окружающей среде).

Answer 2

Calculating Heat Transfer from a Heater to Water Flowing Through a Pipe

Given: - Power of the heater (P) = 50 kW - Water flow rate (v) = 1 m/s - Diameter of the pipe (d) = 2 cm - Initial temperature of the water (T1) = 15°C - Final temperature of the water (T2) = 35°C

Calculating the Heat Transfer Rate

To calculate the heat transfer rate from the heater to the water flowing through the pipe, we can use the formula:

Q = m * c * ΔT

Where: - Q is the heat transfer rate - m is the mass flow rate of the water - c is the specific heat capacity of water - ΔT is the change in temperature

Calculating the Mass Flow Rate (m)

The mass flow rate (m) can be calculated using the formula:

m = ρ * v * A

Where: - ρ is the density of water - v is the velocity of water - A is the cross-sectional area of the pipe

Calculating the Cross-Sectional Area (A)

The cross-sectional area (A) of the pipe can be calculated using the formula for the area of a circle:

A = π * (d/2)^2

Calculating the Density of Water (ρ)

The density of water (ρ) at the given temperature can be found using a standard density-temperature chart for water.

Calculating the Specific Heat Capacity of Water (c)

The specific heat capacity of water (c) is a constant value and is approximately 4.18 kJ/kg°C.

Calculating the Change in Temperature (ΔT)

The change in temperature (ΔT) is given by:

ΔT = T2 - T1

Final Calculation

After obtaining the values for mass flow rate (m), density of water (ρ), specific heat capacity of water (c), and change in temperature (ΔT), we can use these values to calculate the heat transfer rate (Q) from the heater to the water.

Note: The specific values for density of water and the specific heat capacity of water at the given temperature are required to perform the calculations.

Let's proceed with the calculations based on the provided information.