Xjpe
Xjpe models jacketed pipe (single tube-in-tube) heat exchangers. A fully incremental program, Xjpe contains HTRI’s latest pointwise methods for predicting condensing, boiling, and single-phase heat transfer and pressure drop. The methods are based on extensive tubeside condensation, boiling, and single-phase data. The heat transfer and pressure drop correlations are continually reviewed and updated as part of our ongoing research program.
Process Specifications
Xjpe handles the following process conditions:
- single-phase
- vertical and horizontal pipe orientations
- annulus and inner pipe
- condensation
- annulus and inner pipe
- vertical downflow condensation
- inner pipe inclined condensation
- pure fluids and multicomponent mixtures
- superheated, saturated, or partially condensed at inlets
- subcooled, or partially or totally condensed at outlets
- vertical intube reflux and downflow condensation
- boiling
- annulus and inner pipe
- vertical upflow boiling
- vertical intube falling film
- pure fluids and multicomponent mixtures
- subcooled, saturated, or partially vaporized at inlets
- superheated, or partially or totally vaporized at outlets
Geometry Specifications
Xjpe accommodates the following geometries:
- horizontal, vertical, and inclined pipes
- piping for horizontal and vertical thermosiphons
- plain or longitudinally finned tubes in fixed tubesheet with/without twisted-tape inserts
- no baffles
Calculation Modes
Xjpe operates in rating, simulation, and design modes.
Rating
You define exchanger geometry and specify process conditions. Xjpe calculates the expected heat transfer coefficients and pressure drops, compares these calculations to the required heat duty, and reports the difference as under- or overdesign.
Simulation
You define exchanger geometry and specify partial process conditions. Xjpe calculates expected exchanger performance and missing process conditions for zero overdesign, as well as heat transfer coefficients, pressure drops, and heat duty.
Design
In the user-specified (or grid) design mode, you have complete control over which geometry is varied and over what range each geometric parameter is varied. Xjpe runs all possible permutations and automatically selects the best available design.
Calculation Methods
Xjpe employs a one-dimensional incrementation scheme, based on HTRI’s latest research, to model jacketed pipe heat exchangers. Localized methods and fluid properties are used to predict the heat transfer and pressure drop in each increment. Incremental techniques allow accurate prediction of complex hydraulics.