Paper Conference

Proceedings of eSim 2010: 6th Conference of IBPSA-Canada

     

DEVELOPMENT OF A STRATIFIED TANK MODEL WITH IMMERSED HEAT EXCHANGERS IN ESP-R

Didier Thevenard, Kamel Haddad

Abstract: A stratified tank model with an immersed helical heat exchanger has been implemented in the plant domain of ESP-r. The model was developed in two phases: first a simple stratified tank model was developed; then a model for immersed heat exchanger was added to the simple model. The stratified model divides the tank into up to 100 segments, or nodes; heat and mass transfer equations between these nodes are solved. In addition, a mixing algorithm simulates the effects of natural convection in situations where warmer segments are located below colder ones; this algorithm groups nodes in fully-mixed sections; heat and mass transfer equations are then solved for sections rather than nodes. The immersed heat exchanger (HX) model is implemented as a subroutine within the stratified tank model. Heat transfer is governed by forced convection inside the coil, conduction through the coil wall, and a combination of free and forced convection outside the coil. The correlations used were chosen based on an extensive literature search. The paper summarizes model development and provides comparisons of model performance against TRNSYS and against experimental data.
Pages: 9 - 16
Paper:
esim2010_1A2_009_016