Modeling and control of single and multiple evaporator vapor compression cycles for electronics cooling

Evaporator Disturbance Rejection in Vapor Compression Cycles with a Linear Quadratic Regulator

“…In most applications, this is handled by separate single-input single-output (SISO) control loops, each driven by separate proportional integral (PI) controllers. This simple approach succeeds when the plant has a large thermal mass and the loads are slowly varying, but performance suffers greatly in the presence of highly transient loads, even becoming unstable in some cases [5]. The feedback gains in each PI loop are typically tuned heuristically, based on prior experience, but tuning around performance objectives is often a process of trial and error, with no metric on whether or not success is even possible.…”

Dryout avoidance control for multi-evaporator vapor compression cycle cooling

“…The nonlinear model for the complete vapor compression cycle is derived using lumped, 1D mass and energy conservation laws applied to the dynamic system components (condenser, evaporators, accumulator), and is based on several low-order VCC models developed in the past [29][30][31][32][33]24,[34][35][36][37]15,17]. The model is presented here as several systems of ordinary differential equations (ODE) in matrix-form, accompanied by tables describing the matrix elements z as well as other necessary closure relations (see Tables A.9, A.10, and A.11).…”

Automation of regenerative compressor cooling system using microcontroller

“…The case for the regenerative compressor cooling stands on cheaper manufacture, energy saving, less compressor work with continuous evaporation cycles [2]. For this, a model was proposed for control of single and multiple evaporator vapor compression cycles with electronic cooling [3]. This invention relates to systems and methods for removing heat from a system.…”