August 11, 2013

HVAC Basics Part I

REHEATER for Humidity Control
In the following example, a reheater is used to reduce the humidity of the air conditioned space.

In figure A, there is no reheater, and the relative humidity is 61.3%.

In figure B, there is a reheater, and consequently a more powerful cooling coil. This cooling coil pulls the air down to a temperature lower than the cooling coil in figure A, causing more condensation.

After this, the heating coil raises the temperature of the air to the desired grill leaving temperature. The relative humidity achieved in the air conditioned space is 53.8%.





Further reading: US5887651

March 31, 2013

Sustainability in Action

Bolivian Law Grants Nature Equal Rights With Humans

By Beth Buczynski.

The Bolivian government has proposed a ground-breaking new law that would grant all of nature equal rights to those of the human race.

Earlier this year, Bolivia passed its own la Ley de Derechos de la Madre Tierra, or “Law of Mother Earth,” as part of a complete restructuring of the Bolivian legal system following a change of constitution in 2009.

The Law of Mother Earth is the world’s first piece of legislation to grant the planet absolute protection against those who would seek to exploit or destroy its resources or ecosystems.

The new law establishes 11 new rights for nature. They include:

the right to life and to exist;
the right to continue vital cycles and processes free from human alteration; the right to pure water and clean air;
the right to balance;
the right not to be polluted;
and the right to not have cellular structure modified or genetically altered.

The Guardian reports that the law has been heavily influenced by a resurgent indigenous Andean spiritual world view which places the environment and the earth deity known as the Pachamama at the centre of all life. Humans are considered equal to all other entities.

The Law of Mother Earth redefines Bolivia’s tin, silver, gold and other raw mineral deposits as “blessings” and seek to protect the planet from “mega-infrastructure and development projects that affect the balance of ecosystems and the local inhabitant communities.”

“It is not clear at this stage how the somewhat abstract legislation would be implemented,” writes Olivia Solon for Wired. The state will need to be careful to balance the rights of nature with the regulation of industries (such as mining) that contribute a significant chunk of the country’s GDP.

Now, Bolivia is seeking to bring these principles worldwide with a United Nations treaty. The treaty, in draft at this time, would give Mother Earth the same rights as humans, including rights to life, water and clean air, the right to repair livelihoods affected by human activities, and the right to be free from pollution (SlashGear).

Critics of the law and its potential to inspire a treaty for UN nations say that it’s nothing more than an attempt by Bolivia’s socialist President Morales to “eradicate capitalism” and to force wealthy industrialized countries to “pay their environmental debt.”

Personally, I think that if the mega-corporations get to hide behind the legal protections of “personhood” as they pillage and pollute the planet, it’s only fair that she should be able to stand and defend herself with the same inalienable rights.

There could be no better Earth Day gift.