What is heat capacity ratio in heat exchanger?
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What is heat capacity ratio in heat exchanger?
Capacity ratio (C): It is defined as ratio of minimum to maximum capacity rate of fluids being used in a heat exchanger. as cmin = mh cph and cmax = mc cpc. The fluid with lower heat capacity rate will undergo greater change in temperature as compared to fluid with higher heat capacity rate.
What is CMIN in heat exchanger?
The terms UA/Cmin is called the number of transfer units (NTU) since it is indicative of the. size of the heat exchanger, i.e. min. C. UA.
How do you calculate the heat capacity of a heat exchanger?
ΔTm =
- ΔTm =
- = 94.9 °F. 0.10536.
- The preliminary area estimate of the heat exchanger can now be calculated as: A = Q / (U x ΔTm) =
- A = 2, 035, 000 Btu/hr.
- = 178.7 ft² (120 Btu/h.ft².°F).(94.9°F)
- The required mass flow rate of water can be calculated from Q = m.Cp. ΔTm: Rearranging:
- m = Q…… = Cp x ΔTm.
- m = (2,035,000 Btu/hr)
Can effectiveness of heat exchanger be greater than 1?
EFFECTIVENESS OF HEAT EXCHANGER – It is defined as the ratio of actual heat transfer rate to the maxinum possible heat transfer rate . Since the actual heat transfer is always less than the maximum possible heat transfer , So ,effectiveness will be always less than 1 ( one ) .
What is the capacity ratio?
The capacity ratio is thus a measure of solvency in which availability for a particular academic year is divided by the placement needs for that same year. Inserting different numbers into each of these parameters facilitates projections for future capacity.
How do you find the ratio of specific heat?
The ratio of the specific heats γ = CP/CV is a factor in adiabatic engine processes and in determining the speed of sound in a gas. This ratio γ = 1.66 for an ideal monoatomic gas and γ = 1.4 for air, which is predominantly a diatomic gas.
What is difference between LMTD and NTU?
The LMTD method is convenient for determining the overall heat transfer coefficient based on the measured inlet and outlet fluid temperatures. The ε-NTU method is more convenient for prediction of the outlet fluid temperatures if the heat transfer coefficient and the inlet temperatures are known.
What is effectiveness in heat exchanger?
The effectiveness (ϵ) of a heat exchanger is defined as the ratio of the actual heat transfer to the maximum possible heat transfer.
On what factor does the effectiveness of heat exchanger depend?
Effectiveness of the heat exchanger depends on the thermal conductivity and convective heat transfer coefficient of the fluid.
How do you find the capacity ratio?
The capacity utilisation ratio measures whether the total direct labour hours worked in a production cost centre in a period was greater or less than what was budgeted. It is calculated as: (Actual direct labour hours worked ÷ budgeted direct labour hours) × 100\%.