Top Heating & Cooling Experts for commercial hvac repair Colonial Heights, VA. Phone +1 804-409-9159. 24 Hour Calls. Guaranteed Services – Low Prices.

Contact Us

River City Heating & Air

6404 Mallory Dr, Richmond, VA 23226, United States

Telephone

+1 804-409-9159

Hours

Mon-Fri, 8am – 5pm

Space pressure can be either positive or negative with regard to outside the room. Positive pressure happens when there is more air being provided than tired, and prevails to reduce the infiltration of outside contaminants. Natural ventilation is an essential aspect in reducing the spread of airborne diseases such as tuberculosis, the cold, influenza and meningitis.

Natural ventilation requires little upkeep and is inexpensive. An air conditioning system, or a standalone air conditioning unit, provides cooling and humidity control for all or part of a building. Air conditioned structures often have sealed windows, due to the fact that open windows would work versus the system planned to maintain constant indoor air conditions.

The percentage of return air comprised of fresh air can generally be controlled by adjusting the opening of this vent. Common fresh air consumption is about 10%. [] A/c and refrigeration are supplied through the elimination of heat. Heat can be gotten rid of through radiation, convection, or conduction. Refrigeration conduction media such as water, air, ice, and chemicals are referred to as refrigerants.

It is crucial that the cooling horse power suffices for the area being cooled. Underpowered a/c system will result in power wastage and ineffective usage. Appropriate horsepower is required for any ac system installed. The refrigeration cycle utilizes four necessary elements to cool. The system refrigerant starts its cycle in a gaseous state.

From there it goes into a heat exchanger (in some cases called a condensing coil or condenser) where it loses energy (heat) to the outdoors, cools, and condenses into its liquid phase. An (likewise called metering gadget) manages the refrigerant liquid to stream at the appropriate rate. The liquid refrigerant is returned to another heat exchanger where it is enabled to evaporate, hence the heat exchanger is often called an evaporating coil or evaporator.

In the process, heat is soaked up from indoors and moved outdoors, leading to cooling of the building. In variable environments, the system might consist of a reversing valve that changes from heating in winter season to cooling in summer. By reversing the circulation of refrigerant, the heat pump refrigeration cycle is altered from cooling to heating or vice versa.

Free cooling systems can have extremely high performances, and are sometimes combined with seasonal thermal energy storage so that the cold of winter season can be utilized for summer season cooling. Common storage mediums are deep aquifers or a natural underground rock mass accessed through a cluster of small-diameter, heat-exchanger-equipped boreholes.

The heat pump is added-in because the storage functions as a heat sink when the system remains in cooling (rather than charging) mode, triggering the temperature level to slowly increase during the cooling season. Some systems include an “economizer mode”, which is in some cases called a “free-cooling mode”. When economizing, the control system will open (completely or partially) the outdoors air damper and close (totally or partly) the return air damper.

When the outside air is cooler than the required cool air, this will permit the need to be fulfilled without using the mechanical supply of cooling (usually chilled water or a direct expansion “DX” unit), thus conserving energy. The control system can compare the temperature of the outside air vs.

In both cases, the outdoors air should be less energetic than the return air for the system to go into the economizer mode. Central, “all-air” air-conditioning systems (or bundle systems) with a combined outdoor condenser/evaporator system are typically set up in North American residences, offices, and public structures, but are difficult to retrofit (set up in a building that was not created to get it) due to the fact that of the bulky duct required.

An alternative to packaged systems is the usage of separate indoor and outdoor coils in split systems. Split systems are preferred and extensively used around the world other than in The United States and Canada. In The United States and Canada, divided systems are usually seen in property applications, but they are acquiring appeal in small industrial structures.

The benefits of ductless air conditioning systems consist of easy setup, no ductwork, greater zonal control, versatility of control and peaceful operation. [] In space conditioning, the duct losses can represent 30% of energy usage. Using minisplit can lead to energy savings in space conditioning as there are no losses related to ducting.

Indoor units with directional vents mount onto walls, suspended from ceilings, or fit into the ceiling. Other indoor systems mount inside the ceiling cavity, so that brief lengths of duct deal with air from the indoor unit to vents or diffusers around the rooms. Split systems are more effective and the footprint is typically smaller than the bundle systems.

Call Now