Heating

Heating Systems may be classified as central or local. Central heating is often used in cold climates to heat public buildings and private houses. Such a system contains a furnace, boiler or heat pump to heat water, steam, or air, all in a central location such as a furnace room in a home or a mechanical room in a large building. The system also contains piping or ductwork to distribute the heated fluid, and radiators to transfer this heat to the air. The term radiator in this context is misleading since most heat transfer from the heat exchanger is by convection, not radiation. The radiators may be mounted on walls or buried in the floor to give under-floor heat.

In boiler fed or radiant heating systems, all but the simplest systems have a pump to circulate the water and ensure an equal supply of heat to all the radiators. The heated water can also be fed through another heat exchanger inside a storage cylinder to provide hot running water.

Forced air systems send heated air through ductwork. During warm weather the same ductwork can be reused for air conditioning. The forced air can also be filtered or put through air cleaners. Most ducts cannot fit a human being (as they do in many films) since this would require a greater duct-structural integrity and create a potential security liability.

Heating can also be provided from electric, or resistance heating using a filament that glows hot when you cause electricity to pass through it. This type of heat can be found in electric baseboard heaters, portable electric heaters, and as backup or supplemental heating for heat pump (or reverse heating) system.

The heating elements (radiators or vents) should be located in the coldest part of the room and typically next to the windows to minimize condensation. Popular retail devices that direct vents away from windows to prevent "wasted" heat defeat this design parameter. Drafts contribute more to the subjective feeling of coldness than actual room temperature. Therefore, rather than improving the heating of a room/building, it is often more important to control the air leaks.

The invention of central heating is often credited to the ancient Romans, who installed a system of air ducts called "hypocaust" in the walls and floors of public baths and private villas. The ducts were fed with hot air from a central fire. Generally, these heated by radiation; a better physiologic approach to heating than conventional forced air convective heating.

Career of Refrigeration Technician

Company: Kroger Mid-South Division Location: Louisville and Surrounding Areas
Kentucky Company Profile: View Profile Other Categories: HVAC Service Technician
Facility Maintenance Technician
Controls Technician Specialty Field: Commercial Training/Education: EPA Refrigeration Certification Experience: 1-Year Field Experience Salary Range: $10 to $25 an Hour Based on Experience & Ability
Specific job responsibilities / qualifications required including certifications:

Do you have experience performing work on grocery store equipment? Are you looking for the opportunity to be able to utilize all of your skills? We have a job opening for an energetic, hard working, highly motivated, self starter to perform service on grocery store equipment. This equipment includes conventional and parallel rack refrigeration systems, heating and air conditioning units and various other equipment located within a grocery store.

This position requires:
EPA Refrigeration Certification Ability to perform troubleshooting, repair and preventive maintenance Welding experience a must. Electrical and computer skills a plus, but not required. Applicants must have a valid drivers license Must have basic hand tools for the trade Travel to various store locations Exposure to moderate noise, risk of shock and exposure to moving mechanical parts To work shifts will generally be Monday through Friday working 8-9 hours

In addition to the to competitive salaries and an attractive bonus program upon qualification, Kroger offers the following benefits:

Medical Plan Prescription Drug Plan Dental Plan Vision Plan 401(K) Savings Plan Company-Sponsored Retirement Benefit Company-Paid Life Insurance Voluntary Life Insurance Personal Accident Insurance Dependent Group Life Insurance Long-Term Disability Insurance Long Term Care Insurance Health & Dependent Day Care Flexible Spending Accounts Group Legal Group Homeowners and Auto Insurance Stock Purchase Plan Employee Assistance Plan Paid Vacation Program Merit Increases Incentives Program Credit Union Membership Company-Paid Continuing Education Program

Kroger Mid-South Division has been providing maintenance services with it's in-house department for over 30 years. Become a part of our exciting team. Share our reputation for providing expert services! Become part of the tradition-Join Kroger Mid-South Division.

Applicants must be authorized to work in the US.
Kroger Mid-South Division
P.O. Box 32680
Louisville, KY 40232-2680

Introduction of RHVAC

RHVAC (pronounced either "R-H-V-A-C" or, occasionally, "R-H-VAK") is an initialism/acronym that stands for "reffigeration, heating, ventilation and air conditioning". RHVAC is sometimes referred to as "climate control" and is particularly important in the design of medium to large industrial and office buildings such as sky scrapers and in marine environments such as aquarims, where humidity and temperature must all be closely regulated whilst maintaining safe and healthy conditions within.

Refrigeration, heating, ventilation, and air conditioning is based on the basic principles of thermodynamics, heat transfer and fluid mechanics, and to inventions and discoveries made by Sadi Carnot, Michael Faraday, James Joule, William Rankine, Willis Carrier, and many others. The invention of the components of RHVAC systems goes hand-in-hand with the industrial revolution, and new methods of modernization, higher efficiency, and system control are constantly introduced by companies and inventors all over the world.

The three functions of heating, ventilation, and air-conditioning are closely interrelated. All seek to provide thermal comfort, acceptable indoor air quality, and reasonable installation, operation, and maintenance costs. RHVAC systems can provide ventilation, reduce air infiltration, and maintain pressure relationships between spaces. How air is delivered to, and removed from spaces is known as room air distribution.

In modern buildings the design, installation, and control systems of these functions are integrated into one or more RHVAC systems. For very small buildings, contractors normally "size" and select RHVAC systems and equipment. For larger buildings where required by law, "building services" designers and engineers, such as architectural, mechanical, or building services engineers analyze, design, and specify the HVAC systems, and specialty mechanical contractors build and commission them. In all buildings, building permits for, and code-compliance inspections of the installations are the norm.

The RHVAC industry is a worldwide enterprise, with career opportunities including operation and maintenance, system design and construction, equipment manufacturing and sales, and in education and research. The RHVAC industry had been historically regulated by the manufacturers of RHVAC equipment, but Regulating and Standards industries such as AMCA, SMACNA, ASHRAE and ACCA, have been established to support the industry and encourage high standards and achievement. Most recently, the ICC has been established to create international standards that many countries, including the US, Canada, the UK, Australia and many others have been adopting.