Topic
Thermal efficiency
About: Thermal efficiency is a research topic. Over the lifetime, 20911 publications have been published within this topic receiving 302373 citations. The topic is also known as: thermodynamic efficiency & efficiency.
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TL;DR: In this paper, a review of the technologies involved in CCHP systems based on biomass combustion is presented, and some guidelines are proposed to develop small-scale C-CHP plants in an energy efficient way.
179 citations
DOI•
01 Jan 1990TL;DR: In this paper, the authors reviewed the development of three types of pulse tube refrigerators: basic, resonant, and orifice types, and compared the efficiency and refrigeration power with those of other refrigeration cycles.
Abstract: This paper reviews the development of the three types of pulse tube refrigerators: basic, resonant, and orifice types. The principles of operation are given. It is shown that the pulse tube refrigerator is a variation of the Stirling-cycle refrigerator, where the moving displacer is substituted by a heat transfer mechanism or by an orifice to bring about the proper phase shifts between pressure and mass flow rate. A harmonic analysis with phasors is described which gives reasonable results for the refrigeration power yet is simple enough to make clear the processes which give rise to the refrigeration. The efficiency and refrigeration power are compared with those of other refrigeration cycles. A brief review is given of the research being done at various laboratories on both one and two-stage pulse tubes. A preliminary assessment of the role of pulse tube refrigerators is discussed.
179 citations
TL;DR: In this article, the performance of three earth-to-air heat exchanger (EAHX) for mid European office buildings in service is investigated, with the aim of characterising their efficiency.
178 citations
TL;DR: In this article, the authors investigated the energy output, thermal output, drying efficiency and specific energy in various drying methods for drying of chamomile, including convective, infrared, convective-infrared, microwave, microwaveconvective, microwave-vacuum, vacuum, and hybrid photovoltaic-thermal solar (with/without heat pump).
176 citations
TL;DR: In this article, the effects of adding Multi-Walled Carbon nanotubes (MWCNTs) to Jojoba methyl ester-diesel blended fuel (JB20D) on performance, combustion and emissions characteristics of a compression-ignition engine were experimentally investigated.
175 citations