Tuesday, April 23, 2013

Heating and cooling of electric cars can be simplified the thermal accumulator

Отопление и охлаждение электромобилей можно упростить тепловым аккумулятором   It is widely known that, unlike the car with DVS, electromachines extremely difficult are given salon heating in the winter. Certainly, speech not about low-potential heat; such car spends the electric energy reserved in and without those to not too capacious battery. In a word, if in the passport of your Nissan Leaf "150 km" are written any, in a minus twenty they quite can shrivel literally to one hundred.

  Evelyn Wong (Evelyn Wang), the professor of Massachusetts Institute of Technology (USA), heads works on creation of alternative system of heating, and at the same time and car conditioning. What can he offer "green" motorists?

Nissan Leaf в американских зимних тестах пробегал на 37,5% меньше, чем летом. (Фото Nissan.)

Nissan Leaf in the American winter tests ran 37,5% less, than in the summer. (Nissan photo. )

   In its system water is injected into the container of low pressure, evaporates and thus absorbs heat. Then water vapor contacts to absorbent — a hydrophilic material with microscopic a time (will approach and the modified zeolite). On absorbent water leaves the container, supporting in it the low pressure necessary for effective work of system. Then the new portion of water moves in the container — and so on.

   Heat received at absorption of water, can be disseminated in the atmosphere through a radiator ("a conditioner mode") or is used for salon heating if it is a question of a cold season. From the description it is visible that work of system demands much less electricity, than is usually spent in the electric car for the conditioner or heating system on TENs. In total that it is necessary — to support not too powerful pumps.

   Certainly, the success isn't given by gift: in fact, before us the heataccumulator as when absorbent will save up enough water, the system will rise. To extract the water reused in a cycle, the material should be heated to 200 °C then this "the thermal accumulator" on a water basis is again efficient within several hours (everything depends on an amount of water and absorbent).

   Where to take energy for a recharge of "the thermal accumulator"? In principle, the electric heater is capable of this feat, but "there is a set of other possible sources of heat — will tell, warmly from a solar water heater therefore it is possible to do without electricity". The benefit water evaporation from absorbent lasts not more long than four hours that is close to time of a recharge of accumulators of modern electric cars. Soon one of options of this system while tested in laboratory, it will be checked on Ford Focus EV.

Модель Ford Focus EV, на одной из которых вскоре начнутся испытания новой системы охлаждения и отопления салона (фото Ford).

The Ford Focus EV model, on one of which tests of the new cooling system and salon heating (Ford photo) will soon begin.

   That to a solar water heater, it is difficult to call this "green" idea too practical. Really electrogas stations should hold also solar water heaters, on one on each electric car? However, not everything is so bad: even if to drain absorbent the electric heater (not at a driving, of course, and at night, at recharge), range, and without that often not exceeding 160 km, in cold time remains normal, instead of will fall to a third because of work of system of heating.

   And here for hybrids the idea looks better — if, of course, to modify temperature of heating of absorbent. At a hybrid car low-potential heat during DVS work all the same arises sooner or later, and it can quite be used for water evaporation from absorbent. Respectively, in such scheme power selection at the motor for the cooling system is excluded — so, the general fuel consumption is lower also.

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