Radiators
and convectors are
types of heat
exchangers designed to transfer thermal energy from one medium to
another for the purpose of cooling and heating. Majority of the radiators
are constructed to function in automobiles, buildings, and electronics.
In automobiles, with a liquid-cooled internal combustion engine, a
radiator is connected to channels running through the engine and cylinder
head, through which is pumped a liquid (coolant). This liquid is typically
a mixture of water with antifreeze and a little corrosion inhibitor.
A system of valves or baffles, or both, is usually incorporated to
simultaneously operate a small radiator inside the car. This small
radiator, and the associated blower fan, is called the heater core and
serves to warm the cabin interior. (Heating the interior of the car also
helps to cool the engine, this is the reason for the mechanic's
instruction to turn on the heating system if the car is overheating.)
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Alphabetical Listings
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Cook's Radiator Svc
1984 Broadway St, Vallejo, CA 707 642-1260
Gene's Auto Repair
37 Tennessee St, Vallejo, CA 707 642-1900
Jiffy Lube
605 Lincoln Ave, Napa, CA 707 254-9934
Mobile Radiator Svc
Vallejo, CA 707 643-7434
Ray's Radiator & Glass
360 Mccormick St, St Helena, CA 707 963-5223 |
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Marin, Napa, Sonoma and Solano Counties) and the world wide web below
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Temperature control
The engine temperature is controlled by the thermostat, a wax-pellet
type temperature operated valve. When the engine is cold the
thermostat is closed. Coolant bypasses back to the inlet of the
circulating pump and is returned directly to the engine. Directing
water to circulate only through the engine, and the heater core,
allows heat to build up in the engine. When the coolant reaches the
thermostat's activation temperature it begins to open, allowing water
into the radiator. The thermostat will open as far as needed to
maintain the design temperature by metering the amount of water going
to the radiator.
How far the thermostat opens depends on many factors such as engine
power demand, heat produced, the air flow through the radiator,
outside air temperature and cleanliness of the radiator itself. The
basic process is entirely mechanical, the only electrically controlled
part is the electric cooling fan. Some, mostly older, cars do not use
an electric fan but one driven by the engine directly, or via a fan
clutch or a simple fluid coupling, as part of the water-pump drive
from the crankshaft pulley.
The size of the radiator is usually chosen so that it can keep the
engine at the design temperature under the most extreme conditions a
vehicle is likely to encounter (such as climbing a mountain while
fully loaded on a hot day). |
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