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L.D. Porta gives the following equation determining the efficiency of a steam locomotive, applicable to steam engines of all kinds: power (kW) = steam Production (kg h −1)/Specific steam consumption (kg/kW h). A greater quantity of steam can be generated from a given quantity of water by superheating it.
A duplex steam pump has two sets of steam and water cylinders. They are not physically connected but the steam valves on the first pump are operated by the movement of the second pump's piston rod, and vice versa. The result is that there are no "dead spots" and the pump is always self-starting. [2]
In the 1986 MOD II Design Report (Appendix A) the results showed that highway gas mileage was increased from 40 to 58 mpg ‑US (5.9 to 4.1 L/100 km; 48 to 70 mpg ‑imp) and achieved an urban range of 26 to 33 mpg ‑US (9.0–7.1 L/100 km; 31–40 mpg ‑imp) with no change in vehicle gross weight. Startup time in the NASA vehicle was a ...
However, low power pumps operate with 1-20W. [69] [70] Assuming a solar collector panel delivering 4 kWh/day and a pump running intermittently from mains electricity for a total of 6 hours during a 12-hour sunny day, the potentially negative effect of such a pump can be reduced to about 3% of the heat produced.
By condensing the working steam vapor to a liquid, the pressure at the turbine outlet is lowered, and the energy required by the feed pump consumes only 1% to 3% of the turbine output power. These factors contribute to a higher efficiency for the cycle. The benefit of this is offset by the low temperatures of steam admitted to the turbine(s).
The pump engine was installed at the surface near a boiler, to minimize efficiency losses in steam transport and to prevent damage to the engine in case of an emergency shut-off. [5] It was housed in a massive red sandstone pump house, 60 feet (18 m) high, 36 feet (11 m) by 42 feet (13 m) at the base, with a foundation 23 feet (7.0 m) thick. [ 6 ]
In commercial power plants, there are two to four steam generators per reactor; each steam generator can measure up to 70 feet (21 m) in height and weigh as much as 800 tons. Each steam generator can contain anywhere from 3,000 to 16,000 tubes, each about .75 inches (19 mm) in diameter.
1872 – Pulsometer steam pump, a pistonless pump, patented by Charles Henry Hall. It was inspired by the Savery steam pump. It was inspired by the Savery steam pump. 1873 – The British chemist Sir William Crookes invents the light mill a device which turns the radiant heat of light directly into rotary motion.
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