Rotary Regenerators for the Whirlfire Vehicular Turbines
The major considerations in the selection, design and development of a rotary regenerator for a vehicular gas turbine are discussed. The performance results, such as effectiveness, pressure loss and leakage of the regenerator in the General Motors Research GT-305 gas-turbine engine are presented in detail. A method for evaluating …
COMPACT HEAT EXCHANGERS FOR SMALL GAS …
Two types of the more promising heat exchangers, the contra-flow rotary regenerator and the cross-flow recuperator, have been discussed in detail, and equations developed by …
Effectiveness of Fixed-Bed Regenerators for Energy …
Rotary regenerators have been extensively studied in the literature[11]; however, studies regarding the application of stationary regenerators in HVAC systems in the literature are very limited[12]–[15], despite their promising effectiveness compare to other types of AAEEs. Although several studies have been done to
REGENERATIVE HEAT EXCHANGERS
Rotary Regenerators. In the Ljungström air preheater, or rotary regenerator, the porous packing is rotated around an axis. In its simplest form, the packing is divided into two gas tight sections and the hot and cold gases flow simultaneously in a direction …
Numerical analysis of the performance characteristics and …
1. Introduction. A rotary regenerator has been widely used in power plants, industrial processes, and furnaces to recover heat energy from high temperature exhaust air [1], [2], [3] because of effective gas to gas heat transfer with a large heat transfer area per volume. A rotary regenerator has reduced maintenance cost due to the characteristic …
The study on heat transfer model of tri-sectional rotary air preheater
Rotary air preheaters, especially tri-sectional air preheaters have been proved to have a considerable influence on the performance of the entire steam boiler. Tri-sectional thermal regenerators are commonly operated in counter-flow mode as shown in Fig. 1. It mainly consists of a heating matrix of solid material and the hot gas passes through ...
Stirling cycle refrigerator or engine employing the rotary …
The improved Stirling machine of the present invention is best understood conceptually with reference to FIGS. 3A-3D in which the machine 30 is shown to comprise an expansion side Wankel mechanism 31 and a compression side Wankel mechanism 32 interconnected through first and second stationary regenerators, 33 and 34, respectively.
Design and optimization of regenerators of a rotary …
It has a rather complicated, rotary magnet assembly design with 0.0073 m 3 magnet and high figure of merit of Λ cool = 0.2 T ⅔ and 24 stationary regenerators delivering 100 W cooling capacity over 20.5 K temperature span with 2.8 kg gadolinium as refrigerant. Among the reciprocating designs the prototype presented by Balli et al. …
What is Regenerator (or Regenerative Heat
Advantages of Regenerators. Maximum heat transfer. Minimum pressure loop. High efficiency. Less weight per kW of plant. Disadvantages of Regenerators. Costly; Leakage creates problems. Applications of Regenerators. I.C. Engines. Gas Turbines. Open hearth and glass melting furnaces. Air heaters of blast furnaces.
(PDF) Design of Regenerative Heat Exchangers
Rotary regenerative heat exchangers or rotary regenerators are used for various heat recovery applications in order to fulfill the energy requirements. Rotary air preheater is a rotary ...
Influence of leakage distribution on the thermal performance of …
Thermal design of rotary regenerators with finite leakages The thermal design theory of rotary regenerators is well established 2, 5 . However, the influences of various leakage streams, unavoidable and detrimental to the operation of such heat exchangers, were mostly omitted or incorporated in a simplified manner to make the problem solution ...
Rotary Regenerator
Rotary regenerator technology consists of two isolated flow streams, one containing hot exhaust gases and the other containing a cooler stream. The technology operates in a …
The utilization of recuperated and regenerated engine
The negative characteristics of regenerators are: the seal and matrix `carryover' leakage, which together can reach high levels-e.g. 15% of the compressor mass flow, a substantial penalty; the high wear and poor reliability record of many rotary regenerators; and the impracticability hitherto of being able to manufacture …
Design of Regenerative Heat Exchangers
Rotary regenerators are used widely for energy recovery, both in industrial and air-conditioning applications, because of the advantages they have over other types of heat exchangers. In this study, a mathematical model for the design of rotary regenerators is presented. The method is valid for all kinds of channel geometries that form the ...
Analysis of heat and mass transfer in rotary regenerators
Rotating regenerators or heat wheels and plate heat exchanger are the generally used gas-gas heat exchanger [114]. Gas-liquid heat exchanger is also commonly used heat exchanger in the steam ...
Rotary regenerator: Constructal thermoeconomic optimization
In this research, rotary regenerator (RR) is optimized using constructal theory. For this aim, a heat exchanger with two branches is considered. RR effectiveness and total annual cost (TAC) are deliberated as objective functions and 9 design variables are selected. The multi-objective optimization algorithm is used to obtain the optimal …
Indirect estimation of leakage distribution in steam boiler rotary …
The method proposed permits one to evaluate leakage distributions within steam boiler rotary regenerators. In principle, the method is based on a gas flow diagram of the regenerator, where gas streams are arranged into a network in which the corresponding mass flow rates are governed by pressure drops in the seals and matrix …
A comparison of rotary regenerator theory and
For the rotary air preheater of 5.3 m diameter, the temperature distributions computed are compared with experimental data. Right trends and a fair agreement between theory and experiments are found. Finally, the computed and experimental regenerator heat transfer effectivenesses are compared and found to be within ±3% agreement at about …
Novel rotary regenerative heat exchanger using cascaded …
In various applications, the regenerators are commonly in rotary type, which are referred to as thermal wheel, heat wheel [4], rotary air preheater (RAPH) [5], [6], rotary gas-to-gas heater or Ljungstrom wheel [3]. With the rotor rotating through the hot and cold fluids in sequence, the continuous heat transfer from hot fluid to cold fluid is ...
Waste Heat Recovery Technologies and Applications
Rotary regenerators are used for low – medium tem- perature applications and could potentially o ff er a very high overall heat transfer e ffi ciency [38] (see Fig. 8 ).
Effect of Core Geometrical Characteristics on …
Rotary regenerative heat exchanger which is also called rotary regenerator is not only used in power plant but also find wide applications in other industries as heat …
An effective engineering computational procedure to
Furthermore, rotary regenerators are used in steam power plants, where their influence on the overall efficiency of the system was investigated experimentally and numerically by Alagic et al. [10] and then numerically by Eljsan et al. [11]. It was found that the regenerator performance relies on its rotation speed, where within a limited range ...
Numerical Modeling of Regenerative Rotary Heat …
The rotary heat exchanger is one of the most effective and efficient devices for heat recovery or heat exchanging purposes. It is a regenerative type of heat …
Numerical modeling of heat transfer in the fixed-matrix …
as regenerators. Regenerative heat exchangers are classified as fixed-matrix and rotary regenerators. The fixed-matrix or fixed-bed regenerator is a periodic-flow heat transfer device with high thermal capacity matrix through which the hot fluid stream and cold fluid stream pass alternately [1, 2]. Specific parameters determine
Performance analysis of a rotary active magnetic refrigerator
Performance results for a novel rotary active magnetic regenerator (AMR) and detailed numerical model of it are presented. The experimental device consists of 24 regenerators packed with gadolinium (Gd) spheres rotating inside a four-pole permanent magnet with magnetic field of 1.24 T.A parametric study of the temperature span, cooling …
A Class of Reduced-Order Regenerator Models
In future research work, the developed endoreversible regenerator models should be validated for a wider range of design parameters and operational conditions. …
Effectiveness of Rotary Air Preheater in a Thermal Power …
Rotary air preheater is the main equipment used to recover. waste heat from the exhaust flue gases in thermal po wer plants. By preheati ng the combustion air with the hot flue gases. leaving out ...
Coke Ovens
• regenerators clean out • high pressure grouting: battery top, gas guns, gas risors, door frames • end flue panel patch • end flue replacement • charge hole casting re-set/replacement • flue casting re-set/re placement • wharf repair application equipment door spray buggy rotary dry gunite machine pressurized dry gunite machine
Analysis of heat and mass transfer in porous sorbents used in rotary …
Fig. 1(a) illustrates a typical rotary regenerative exchanger. The rotary matrix revolves at a constant velocity ω, being cyclically exposed to two physically separated air streams, which can be either in counterflow or co-current arrangement.These streams, labeled inlet-stream I and inlet-stream II, are fed to the regenerator through two ducts, …
New regenerator for gas turbines
Another substantial advantage over rotary regenerators (either of the steady-flow or discontinuous-flow types) is that none of the matrix surfaces is taken by seals, which can cover large proportions of the matrix surfaces. For more information contact Dave Wilson at . [email protected], or Jim Kesseli at . …