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4. where hh and hc are the heat transfer coefficients on hot and cold sides respectively and k is the thermal conductivity of the heat exchanger material and t is the plate thickness. At this point it depends which subroutine the user has called. For subroutine PCHEvol the heat transferred in a node was calculated from: q=Ahh(tavh −tavc) (3-40) where tavh and tavc are the average hot and cold fluid temperatures respectively and Ah is the node heat transfer surface, defined as ln (π dc/+dc). For subroutine PCHElen the length of the node, ln, is calculated based on the node power q (total power divided uniformly among the nodes). It is calculated from: (3-41) 5. where dc is the channel diameter The cold end node enthalpy hce can be calculated from: hce =hhe − q m& n 6. 7. 8. where hhe is the known cold or hot side enthalpy on the node hot end and m& n is the hot or cold node mass flow rate The outlet pressure is calculated based on the model described in Section 3.3.2. Given the pressure and enthalpy the cold end temperatures can be estimated The code iterates until the calculated values of pressures, temperatures and enthalpies are within the specified precision. Then the node evaluation is ln= q ⎛d ⎞ h⎜π c +d ⎟(t −t ) ⎝2 c⎠avh avc 56 (3-42)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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