Sensible heat definition

The specific enthalpy change associated with the transition of a substance from one phase to another at constant temperature and pressure is known as the latent heat of the phase change (as distinguished from sensible heat, which is associated with temperature changes for a singlephase system). For example, the specific enthalpy change AH for the transition of liquid water to steam at I00°C and 1 atm, which equals 40.6 kJ/mol, is by definition the latent heat of vaporization (or simply the heat of vaporization) of water at this temperature and pressure. 

For consistency with later examples in which heat of dilution effects are important, we read all the enthapies from the steam tables, which have a reference state (where H is defined to be zero btu/lb) corresponding to saturated liquid water at its freezing point. In Example 8.4-1 on p498, Geankoplis works a very similar problem in which all enthalpies are calculated using the conditions of the liquor as the reference state. Then (by definition) H in (19) is zero the enthalpy of the feed // differs from that of the liquor just in sensible heat, which can be estimated as (8.4-... 

WET-BULB TEMPERATURE. The wet-bulb temperature is the steady-state, non-equilibrium temperature reached by a small mass of liquid immersed under adiabatic conditions in a continuous stream of gas. The mass of the liquid is so small in comparison with the gas phase that there is only a negligible change in the properties of the gas, and the effect of the process is confined to the liquid. The method of measuring the wet-bulb temperature is shown in Fig. 23.4. A thermometer, or an equivalent temperature-measuring device such as a thermocouple, is covered by a wick, which is saturated with pure liquid and immersed in a stream of gas having a definite temperature T and humidity ff. Assume that initially the temperature of the liquid is about that of the gas. Since the gas is not saturated, liquid evaporates, and because the process is adiabatic, the latent heat is supplied at first by cooling the liquid. As the temperature of the liquid decreases below that of the gas, sensible heat is transferred to the liquid. Ultimately a steady... 

The early development process of cyclones is very important in the ECS and a definite fact is that the heat fluxes are transferred from ocean to atmosphere, in which the latent heat flux is not only more important than the sensible heat flux but is about 20 times that of the sensible heat flux. The heat fluxes transferred from ocean to atmosphere accelerate the instability of the atmosphere in the lower layer, which is one of the important causes leading to a cyclone developing in the ECS. 

The heat transfer through the cooling/heating coil or jacket is due to the sensible heat. By definition, Tfo is the temperature of the fluid at the entrance of the exchanger, Cpf is the fluid specific heat and vo is the feed flow rate of the fluid, i.e. ... 

Note that is vector of material heat (most simply sensible heat) flowrates, the corresponding vector of heat content factors (per unit mass), by definition only temperature-dependent. 

Data on the radical cations are much more definitive because the parent is well established as a fragment formed by the photoionization of benzene and its isomers, and its hetero derivatives such as pyridine and the three diazines. (This ion, its formation and thermochemistry, is reviewed in Ref. 76.) Unequivocally, the most stable C4H4 isomer is the radical cation of methylenecyclopropene. This last species is perhaps more explicitly and sensibly described as the -CH 2 derivative of cyclopropenium cation and so renamed (cyclopropenio)methyl radical (15). From these studies, the heat of formation of this... 

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