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Generator separately excited by battery Self exciting generators Series on left, shunt on right. A shunt generator is a type of electric generator in which field winding and armature winding are connected in parallel, and in which the armature supplies both the load current and the field current for the excitation (generator is therefore self excited).
Bipolar generators were universal prior to 1890 but in the years following it was replaced by the multipolar field magnets. Bipolar generators were then only made in very small sizes. [1] The stepping stone between these two major types was the consequent-pole bipolar generator, with two field coils arranged in a ring around the stator.
Vapor-compression refrigeration [6] For comparison, a simple stylized diagram of a heat pump's vapor-compression refrigeration cycle: 1) condenser, 2) expansion valve, 3) evaporator, 4) compressor (Note that this diagram is flipped vertically and horizontally compared to the previous one) [7] Temperature–entropy diagram of the vapor-compression cycle.
A representative pressure–volume diagram for a refrigeration cycle. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), [1] in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles.
The critical field resistance is defined as the maximum field circuit resistance (for a given speed) with which the shunt generator would just excite. The shunt generator will build up voltage only if field circuit resistance is less than critical field resistance. It is a tangent to the open-circuit characteristics of the generator (at a given ...
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The swept volume of the compressor would be very high (up to one liter and more). Therefore, the compressor is uncoupled from the cooler. A system of valves (usually a rotating valve) alternately connects the high-pressure and the low-pressure side of the compressor to the hot end of the regenerator.
Fig. 1: Original magnetic field lines. An external magnetic field (blue lines) threads a closed ring made of a perfect conductor (with zero resistance). The total magnetic flux through the ring is equal to the magnetic field multiplied by the area of the surface spanning the ring. The nine field lines represent the magnetic flux threading the ring.
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