Find the enthalpy of 1 kg of stream at 12 or when first is stream is D...
Enthalpy Calculation for Saturated Steam
To calculate the enthalpy of saturated steam, we need to consider the following steps:
Step 1: Determine the Initial State
The initial state of the steam is given as dry saturated steam at 12°C. Dry saturated steam means that the steam is in equilibrium with liquid water at the same temperature and pressure. In this case, the pressure is not specified, so we assume it to be the saturation pressure at 12°C.
Step 2: Determine the Quality of Steam
The weight fraction of superheat (W) is given as 22%. This represents the quality of steam, which is the ratio of the mass of dry steam to the total mass of the mixture. The dry steam mass can be calculated as W times the total mass.
Step 3: Determine the Properties of Dry Steam
Using the quality of steam, we can determine the properties of dry steam at 22% weight fraction. This includes the specific heat capacity (Cp) and the enthalpy of dry steam.
Step 4: Determine the Properties of Saturated Steam
The enthalpy of saturated steam can be determined using the steam tables or steam property calculator. The enthalpy value corresponds to the temperature and pressure of saturated steam at 12°C.
Step 5: Determine the Enthalpy of Superheated Steam
To calculate the enthalpy of superheated steam, we need to know the specific heat capacity of superheated steam at the given temperature range. In this case, the specific heat capacity is given as 250 kg per grade HQ.
Step 6: Calculate the Enthalpy
The enthalpy of the mixture can be calculated using the following equation:
Enthalpy = (1 - W) * Hs + W * Hs + m * Cp * (T - Ts)
Where:
- Hs is the enthalpy of saturated steam
- Ts is the temperature of saturated steam
- T is the temperature of the superheated steam
- m is the mass of superheated steam
By substituting the known values into the equation, we can calculate the enthalpy of the stream at 12°C when it is 22% weight superheated to 250 kg per grade HQ specific heat of superheat.
Please note that the specific values and calculations may vary depending on the actual data provided in the question. The steps outlined above provide a general approach to calculate the enthalpy of a stream with given conditions.