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Portal:Heat exchangers

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Highlighted Engineering for Sustainable Development Page
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How to Build a Mechanically Powered Battery Charger for LED Lighting - An engineering student describes how to build a battery charger that operates using a bicycle wheel. More appropriate technology projects can be found at Mech425 AT Project

                 Highlighted Heat exchanger
An idea of how to make your home or business more
energy efficient.

Engineering for sustainable development

A heat exchanger is a device built for efficient heat transfer from one medium to another. The media may be separated by a solid wall, so that they never mix, or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing, and sewage treatment. One common example of a heat exchanger is the radiator in a car, in which the heat source, being a hot engine-cooling fluid, water, transfers heat to air flowing through the radiator (i.e. the heat transfer medium).




Energy recovery ventilators (ERVs) are closely related, however ERVs also transfer the humidity level of the exhaust air to the intake air.

Shell and tube heat exchanger

Plate heat exchanger
Plate fin heat exchanger
Ground-coupled heat exchanger
Dynamic scraped surface heat exchanger
Waste Heat Recovery Unit
Micro heat exchanger
Moving bed heat exchanger

There are a number of heat exchangers used in Heat recovery ventilation-HRV devices, as diagrammed to the right :
     cross flow heat exchanger up to 60% efficient (passive)
     countercurrent heat exchanger up to 99% efficient (passive)
     rotary heat exchanger (requires motor to turn wheel)
     heat pipes
     thin multiple heat wires (Fine wire heat exchanger)

Incoming air
The air coming into the heat exchanger should be at least 0°C. Otherwise humidity in the outgoing air may condense, freeze and block the heat exchanger.
A high enough incoming air temperature can also be achieved by
recirculating some of the exhaust air (causing loss of air quality) when required,
by using a very small (1 kW) heat pump to warm the inlet air above freezing before it enters the HRV. (The 'cold' side of this heatpump is situated in the warm air outlet.)
using a heating "battery" supplied by heat from a heat source eg hot water circuit from a wood fired boiler, etc.

Earth-to-air heat exchanger

Heat recovery ventilation, often with an earth-to-air heat exchanger, is essential to achieve German Passivhaus standards.
Main article: Ground-coupled heat exchanger

See also....

Air conditioning - Health implications
HVAC.................... http://en.wikipedia.org/wiki/HVAC



The plastic bags was for the heat exchanger - thesis found here:






solar wall



See also: Sterling Engine

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Companies involved in creating heat exchangers

United States