diffirance between heat transfer & thermodynamics
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Answer / nag
heat transfer is the operation between two mediums.
thermodynamics is the result of a property change after
heat transfer.
| Is This Answer Correct ? | 14 Yes | 1 No |
Answer / aish
Thermodynamics tells us:
• how much heat is transferred (dQ)
• how much work is done (dW)
• final state of the system
Heat transfer tells us:
• how (with what modes) dQ is transferred
• at what rate dQ is transferred
• temperature distribution inside the body
| Is This Answer Correct ? | 11 Yes | 1 No |
Answer / manglikrohit
in heat trasfer we check temp diffirance & calculate heat transfer rate
in therodanynamics we check final temp & equilibrum
| Is This Answer Correct ? | 8 Yes | 7 No |
PROCESS DESIGN - EXAMPLE 21.2 : The names of the flow streams could be represented by : H1 for first hot stream, H2 for second hot stream, C1 for first cold stream, C2 for second cold stream. Data of supply temperature Ts in degree Celsius : 150 for H1, 170 for H2, 30 for C1, 30 for C2. Data of target temperature Tt in degree Celsius : 50 for H1, 169 for H2, 150 for C1, 40 for C2. Data of heat capacity Cp in kW / degree Celsius : 3 for H1, 360 for H2, 3 for C1, 30 for C2. (a) Find the enthalpy changes, dH for all streams of flow H1, H2, C1 and C2 in the unit of kW. Take note of the formula dH = (Cp) (Tt - Ts). (b) Match the hot streams H1 and H2 with the suitable cold streams C1 and C2 to achieve the maximum energy efficiency.
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