NESC9566 TAP-LOOP.

1. NAME OR DESIGNATION OF PROGRAM:  TAP-LOOP.

3. DESCRIPTION OF PROGRAM OR FUNCTION

TAP-LOOP is a finite-difference program designed for steady-state and transient thermal analysis of  recirculating fluid loops and associated heat transfer equipment; however, it is not limited to loop analysis. TAP-LOOP was developed  to perform scoping and conceptual design analyses for closed test loops in the Fast Flux Test Facility (FFTF), but it can handle a variety of problems which can be described in terms of potentials, sources, sinks, and storage including, in addition to heat transfer  problems, studies of potential fluid flow, electrical networks, and  stress analysis.

4. METHOD OF SOLUTION

TAP-LOOP employs a finite-difference approximation in which the problem is broken into mesh points each representing a small volume or node. Temperatures are then calculated depending on whether the analysis is steady-state or transient and whether the node contains fluid transport in addition  to diffusion or diffusion only. Five types of nodes are provided: fluid flow nodes consisting of cathode follower and time-lagged nodes, constant-temperature nodes, zero capacitance and finite capacitance nodes. Heat transfer terms are calculated conventionally via conductances or admittances and potential differences.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   999 connections
   500 nodes
   100 nodes having latent heat

6. TYPICAL RUNNING TIME:

The test case ran at NEADB on a UNIVAC 1100/91 in 1 second of CPU time.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

TAP-LOOP was derived from the TAP code developed at Atomics International. Stability improvments and transport lag times were incorporated to provide a more useful design tool for thermal analysis of closed hydraulics systems.

10. REFERENCES:

- C.E. Leach and E.L. Kelley, Jr.:
  TAP-LOOP: A Stable Thermal Analyzer Code for Thermal Analysis of
  Closed Hydraulic Systems
  BNWL-1172 (January 1970).

11. MACHINE REQUIREMENTS:

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

EXEC8 39R7 (UNIVAC 1100).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

          C.E. Leach and E.L. Kelly, Jr.
          Pacific Northwest Laboratory

File name	File description	Records
NESC9566_01.001	Information file	75
NESC9566_01.002	JCL and control information	26
NESC9566_01.003	TAP-LOOP source program	1770
NESC9566_01.004	TAP-LOOP sample problem input	76
NESC9566_01.005	TAP-LOOP sample problem output	1195