HVAC

HVAC (heating, ventilating, and air conditioning; also heating, ventilation, and air conditioning) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, (heating,ventilating and air-conditioning & Refrigeration) or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers).

HVAC is important in the design of medium to large industrial and office buildings such as skyscrapers, onboard vessels, and in marine environments such as aquariums, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.

Ventilating or ventilation (the V in HVAC) is the process of "exchanging" or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, and carbon dioxide. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air.

Heater (disambiguation)

Heater is an object that emits heat.

Heater may also refer to:

In electronics:

In music:

In other fields:

Targetmaster

Targetmaster is a subline of the Transformers toyline that include Nebulan sidekicks who can transform into the Transformers' weapons.

1987 Targetmasters

The first Targetmasters assortment, released in 1987, included six new characters, and five existing ones from the 1986 line, whose toys were slightly remolded with larger peg holes to hold their new weapons, as well as an additional peg hole for each remold to mount its weapon in vehicle mode. In 2003, one of the two Japanese-exclusive Targetmasters from 1987 was added to the Autobot ranks. Unfortunately, the Targetmaster weapon he shares with Decepticon Cyclonus, also share names. To further add to the confusion, the printed names of Stepper and Artfire's weapon/partners in Japan are swapped. Cyclonus's partner Nightstick is called Nebulon (the name Fracas is erroneously given on Scourge's box) and paired with Stepper. Scourge's partner Fracas is called Nightstick and paired with Artfire.

The smaller Targetmaster partners were easily lost making them highly collectable and demand high prices on the secondary market.

Southern Tenant Farmers Union

The Southern Tenant Farmers' Union (STFU) was founded in 1934 as a civil farmer's union to further organize the tenant farmers in the Southern United States.

Originally set up during the Great Depression in the United States, the reasons for the establishment of the STFU are numerous, although they are all largely centered upon money and working conditions. Predominantly, the STFU was established as a response to policies of the Agricultural Adjustment Administration (AAA). The AAA itself was designed by President Franklin D. Roosevelt to help revive the United States' agricultural industry and to recharge the depressed economy.

The AAA called for a reduction in food production, which would, through a controlled shortage of food, raise the price for any given food item through supply and demand. The desired effect was that the agricultural industry would once again prosper due to the increased value and produce more income for farmers. In order to decrease food production, the AAA would pay farmers not to farm and the money would go to the landowners. The landowners were expected to share this money with the tenant farmers. While a small percentage of the landowners did share the income, the majority did not. This led to the formation of the STFU, whose existence serves historically as evidence that such a problem existed.