Consideraciones geométrico cinéticas sobre reacciones solido-fluido

En este trabajo se muestra que, partiendo de un tratamiento cinético para la reacción entre un sólido poroso y un fluido, el orden de reacción aparente con respecto al sólido debe ser menor que uno. Esto a su vez implica otra conclusión de naturaleza exclusivamente geométrica acerca de la estructura porosa del reactivo sólido. Esta conclusión expresa que la superficie por unidad de volumen hecha adimensional tiene que ser mayor que la concentración adimensional del sólido, tomándose como condición de referencia para adimensionalizar a la del estado inicial.It is shown in this paper that from the kinetic treatment for a reaction between a fluid and a porous solid it can he concluded that the apparent order of reaction for the solid ought to he less than one. This in turn implies another conclusion of a purely geometric nature about the porous structure of the solid rèactant; this conclusion says that the dimensionless surface area of solid reactant per unit volume ought to he greater than the dimensionless concentration of that solid, the reference condition being those of the initial ones

Development of a High Latent Effectiveness Energy Recovery Ventilator with Integration into Rooftop Package Equipment

This Final Report covers the Cooperative Program carried out to design and optimize an enhanced flat-plate energy recovery ventilator and integrate it into a packaged unitary (rooftop) air conditioning unit. The project objective was to optimize the design of a flat plate energy recovery ventilator (ERV) core that compares favorably to flat plate air-to-air heat exchanger cores on the market and to cost wise to small enthalpy wheel devices. The benefits of an integrated unit incorporating an enhanced ERV core and a downsized heating/cooling unit were characterized and the design of an integrated unit considering performance and cost was optimized. Phase I was to develop and optimize the design of a membrane based heat exchanger core. Phase II was the creation and observation of a system integrated demonstrator unit consisting of the Enhanced Energy Recovery Ventilator (EERV) developed in Phase I coupled to a standard Carrier 50HJ rooftop packaged unitary air conditioning unit. Phase III was the optimization of the system prior to commercialization based on the knowledge gained in Phase II. To assure that the designs chosen have the possibility of meeting cost objectives, a preliminary manufacturability and production cost study was performed by the Center for Automation Technologies at RPI. Phase I also included a preliminary design for the integrated unit to be further developed in Phase II. This was to assure that the physical design of the heat exchanger designed in Phase I would be acceptable for use in Phase II. An extensive modeling program was performed by the Center for Building Performance & Diagnostics of CMU. Using EnergyPlus as the software, a typical office building with multiple system configurations in multiple climatic zones in the US was simulated. The performance of energy recovery technologies in packaged rooftop HVAC equipment was evaluated. The experimental program carried out in Phases II and III consisted of fabricating and testing a demonstrator unit using Carrier Comfort Network (CCN) based controls. Augmenting the control signals, CCN was also used to monitor and record additional performance data that supported modeling and conceptual understanding. The result of the testing showed that the EERV core developed in Phase I recovered energy in the demonstrator unit at the expected levels based on projections. In fact, at near-ARI conditions the core recovered about one ton of cooling enthalpy when operating with a three-ton rooftop packaged unit