Xem 1-20 trên 21 kết quả Heat pump
  • What is a heat pump? A heat pump is a mechanical device used for heating and cooling which operates on the principle that heat can be pumped from a cooler temperature to a warmer temperature (cold to hot). Heat pumps can draw heat from a number of sources, eg, air, water, or earth, and are most often either air-source or water-source. Although heat pumps have been around for more than a 100 years, the technology has dramatically increased. Not only do heat pumps still operate the common refrigerator, but today, heat pump technology allows us to heat and cool residential...

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  • Luận án đã nghiên cứu được một cách có hệ thống và đầy đủ về các yếu tố ảnh hưởng chính đến chất lượng của chè đen CTC trong quá trình sấy lại và bảo quản là cơ sở để đề xuất giải pháp công nghệ có tính khả năng điều kiện ứng dụng tại Việt Nam; đã kết hợp được ưu điểm nổi bật của phương pháp sấy bơm nhiệt; góp phần giảm tổn thất sau thu hoạch và gia tăng giá trị cạnh tranh của sản phẩm chè.

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  • Luận án đã nghiên cứu được một cách có hệ thống và đầy đủ về các yếu tố ảnh hưởng chính đến chất lượng của chè đen CTC trong quá trình sấy lại và bảo quản là cơ sở để đề xuất giải pháp công nghệ có tính khả năng điều kiện ứng dụng tại Việt Nam; đã kết hợp được ưu điểm nổi bật của phương pháp sấy bơm nhiệt; góp phần giảm tổn thất sau thu hoạch và gia tăng giá trị cạnh tranh của sản phẩm chè.

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  • Chapter 11 - Refrigeration cycles. The objectives of Chapter 11 are to: Introduce the concepts of refrigerators and heat pumps and the measure of their performance, analyze the ideal vapor-compression refrigeration cycle, analyze the actual vapor-compression refrigeration cycle, review the factors involved in selecting the right refrigerant for an application,...

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  • Solar energy, light and heat radiation from the Sun, has been exploited by humans since ancient times using a variety of technology development than ever before. Solar radiation along with secondary resources of energy like wind and solar energy, water power and biomass, make the most of renewable energy available on earth. Only a tiny fraction of the available solar energy is used.

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  • Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS SECTION 12 REFRIGERATION Refrigeration Required to Cool an Occupied Building 12.1 Determining the Displacement of a Reciprocating Refrigeration Compressor 12.4 Heat-Recovery Water-Heating from Refrigeration Units 12.6 Computing Refrigerating Capacity Needed for Air-Conditioning Loads 12.12 Analysis of a Compound CompressionRefrigeration Plant with a WaterCooled Intercooler and Liquid Flash Cooler 12.47 Computation of Key Variables in a Compression Refrigeration Cycle with Both Water- and Flash-Intercooling 12.

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  • Food engineering is usually a difficult discipline for food science students because they are more used to qualitative rather than to quantitative descriptions of food processing operations. Food engineering requires understanding of the basic principles of fluid flow, heat transfer, and mass transfer phenomena and application of these principles to unit operations which are frequently used in food processing, e.g., evaporation, drying, thermal processing, cooling and freezing, etc. The most difficult part of a course in food engineering is often considered the solution of problems.

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  • I. Introduction An important aspect of nuclear reactor core analysis involves the determination of the optimal coolant flow distribution and pressure drop across the reactor core. On the one hand, higher coolant flow rates will lead to better heat transfer coefficients and higher Critical Heat Flux (CHF) limits. On the other hand, higher flows rates will also in large pressure drops across the reactor core, hence larger required pumping powers and larger dynamic loads on the core components.

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  • An electric drive is the electromechanical system that converts electrical energy to mechanical motion. Being a part of automatic equipment, it acts together with the driven object, such as a machine tool, metallurgical, chemical, or flying apparatus, domestic or medical device. Electric drives area includes applications in computers and peripherals, motor starters, transportation (electric and hybrid electric vehicles, subway, etc.

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  • Chapter 6 - The second law of thermodynamics. In this chapter, the thermal energy reservoirs, reversible and irreversible processes, heat engines, refrigerators, and heat pumps are introduced first. Various statements of the second law are followed by a discussion of perpetualmotion machines and the thermodynamic temperature scale. The Carnot cycle is introduced next, and the Carnot principles are discussed. Finally, the idealized Carnot heat engines, refrigerators, and heat pumps are examined.

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  • Chapter 6 - The second law of thermodynamics. Introduce the second law of thermodynamics, which asserts that processes occur in a certain direction and that energy has quality as well as quantity; identify valid processes as those that satisfy both the first and second laws of thermodynamics; introduce the concepts of thermal energy reservoirs, reversible and irreversible processes, heat engines, refrigerators, and heat pumps;...

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  • Chapter 11 - Refrigeration cycles. This chapter introduce the concepts of refrigerators and heat pumps and the measure of their performance, evaluate the maximum possible coefficient of performance for refrigerators and heat pumps based on the reversed Carnot cycle, analyze the ideal vapor-compression refrigeration cycle,...

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  • Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS SECTION 6 INTERNAL-COMBUSTION ENGINES Determining the Economics of Reciprocating I-C Engine Cogeneration 6.1 Diesel Generating Unit Efficiency 6.7 Engine Displacement, Mean Effective Pressure, and Efficiency 6.8 Engine Mean Effective Pressure and Horsepower 6.9 Selection of an Industrial InternalCombustion Engine 6.10 Engine Output at High Temperatures and High Altitudes 6.11 Indicator Use on Internal-Combustion Engines 6.12 Engine Piston Speed, Torque, Displacement, and Compression Ratio 6.

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  • PLUMBING AND DRAINAGE FOR BUILDINGS AND OTHER STRUCTURES FACILITIES PLANNING AND LAYOUT 15.1 Water-Meter Sizing and Layout for Plant and Building Water Supply 15.1 Pneumatic Water Supply and Storage Systems 15.8 Selecting and Sizing Storage-Tank Hot-Water Heaters 15.11 Sizing Water-Supply Systems for High-Rise Buildings 15.14 PLUMBING-SYSTEM DESIGN 15.23 Determination of Plumbing-System Pipe Sizes 15.23 Design of Roof and Yard Rainwater Drainage Systems 15.29 Sizing Cold- and Hot-Water-Supply Piping 15.32 Sprinkler-System Selection and Design 15.

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  • Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS SECTION 25 HYDRAULIC AND PNEUMATIC SYSTEMS DESIGN Determining Response Time of PilotOperated Solenoid-Energized Spool Valves in Hydraulic Systems 25.1 Hydraulic-System Reservoir and Heat Exchanger Selection and Sizing 25.12 Choosing Gaskets for Industrial Hydraulic Piping Systems 25.19 Computing Friction Loss in Industrial Hydraulic System Piping 25.26 Hydraulic-Cylinder Clearance for Damping End-of-Stroke Forces 25.29 Hydraulic System Pump and Driver Selection 25.

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  • To get around this restriction, many diesels incorporate an air pump in the form of an exhaust-driven turbocharger or a mechanical supercharger. Forced induction can double power outputs without violating the smoke limit. And, as far as turbochargers are concerned, the supercharge effect is free. That is, the energy that drives the turbo would otherwise be wasted out the exhaust pipe as heat and exhaust-gas velocity. The absence of an air restriction and an ignition system that operates as a function of engine architecture can wrest control of the engine from the operator.

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  • In common usage, an engine burns or otherwise consumes fuel, and is differentiated from an electric machine (i.e., electric motor) that derives power without changing the composition of matter.[3] A heat engine may also serve as a prime mover, a component that transforms the flow or changes in pressure of a fluid into mechanical energy.[4] An automobile powered by an internal combustion engine may make use of various motors and pumps, but ultimately all such devices derive their power from the engine....

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  • After the ore is extracted, it is generally transferred by bridge conveyor, shuttle cars or load-haul-dump units to a system of conveyors that carry it to underground storage bins, prior to haulage to the surface through a shaft by automated skips. On rare occasions shallow mines may use a decline and conveyor arrangement. Solution mining is currently used at a number of operations in North America. The process relies on the greater solubility at elevated temperatures in brine of sylvite in comparison to salt (NaCl).

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  • When plasma volumes are maintained at or near normal levels, turgidity of the blood does not occur and the heart can continue to pump blood to the body surface and extremities, thus assisting heat dissipation and avoiding potential ‘explosive heat death’. Other factors, which play a role in maintaining plasma volume are connected with the attraction of water. Glucose levels rise on dehydration, resulting in hyperglycaemia; the hygroscopic glucose then attracts water to the blood.

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  • The Evinox ModuSat satellite heating system has been designed to provide apartments and communal housing developments with independent fast recovery hot water and high efficiency heating. With a large range of models available, the system suits a variety of applications, from single occupancy apartments to groups of family homes. Consisting of a fast recovery hot water tank or high capacity heat exchanger, with either a hydraulic header or plate heat exchanger, pump and mixing valve set for the heating the ModuSat offers a total heating solution.

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