A hybrid geothermal system can lower the initial cost of the system by reducing the well field size with a minimal reduction in energy efficiency. In the heating mode, typically a boiler or heat pump is used to provide additional heating for the system. In cooling mode, typically a fluid cooler, cooling tower or heat pump is used to provide additional cooling for the system.
The supply air is introduced near the floor level and rises into the thermal plumes that are formed by heat sources. Displacement Ventilation – An air distribution system that provides cool air into a space at a low level and at a low velocity.Ceiling Fans – Ceiling fans can used as a stand-alone device to improve comfort and with an HVAC system to improve the comfort in a space.Ventilation air is typically provided by the unit ventilator and can be mixed with return air prior to conditioning the supply air. Unit ventilators consist of an internal fan, and a heating and/or cooling coil. Unit Ventilators (UV) – Unit ventilators are typically exposed to the space where it is providing ventilation air and/or conditioning.Fan coil units can be noisy because the fan is within the space or close to the space. A fan coil unit contains an internal fan, heating coil and/or a cooling coil. Ventilation air is typically provided by a dedicated outside air system which supplies outside air directly to the room or to the return ductwork in a ducted system. Fan Coils (FCU) and Blower Coils (BCU) – A terminal unit which is capable of providing heating and/or cooling to a zone or a space.Air source heat pumps use the outside air as its heat source in the heating mode and its heat sink in the cooling mode. Heat pumps move energy from one location to another and the refrigeration process reverses between heating and cooling modes. Heat Pump (water to water, water to air, air to air) – Heat pumps can heat a source of heat or cooling.Humidity and cooling water temperature must be controlled to avoid condensation. Chilled beam systems save fan energy because of the reduced airflow required. Passive chilled beams don’t have air introduced into the unit and heats and cools based on induction only. Active chilled beams have air (typically ventilation air) introduced into the chilled beam to increase the capacity by increasing the induction of the unit. The chilled beam includes a heating and cooling coil. Chilled beams (active and passive) – A chilled beam is the terminal unit that conditions the space.This reduces the energy consumption required to heat and cool the spaces because less energy is wasted to the outdoors or condenser water loop. The heat recovery option allows the evaporators connected to the same condensing unit be in heating and cooling mode at the same time. One condensing unit can serve multiple evaporators to condition the space. Variable Refrigerant Flow (VRF) – A heat-pump system that uses refrigerant as the heating and cooling medium.Supply air temperature varies based on a call for heat or cooling from the thermostat.
Constant Air Volume (CAV) – Single duct air system with constant airflow.Terminal fan powered boxes may be used for better zone control. VAV systems may include a terminal reheat box for better humidity and temperature control. Supply air temperature can be controlled based on heating/cooling demand or reset based on outside air temperature. Variable Air Volume (VAV) – Single duct air system with varying airflow.Reviewing this list prior to or during conversations with your HVAC contractor might allow you to be more informed and less confused about the solutions being proposed for your commercial air conditioning needs. We thought it would be helpful to provide a summary list of the various types of commercial air conditioning systems used in the US today. There are many types of specialized HVAC technology used in commercial buildings and these are often much different from those terms used in common residential applications. HVAC Technology Terms & Systems for Business
0 kommentar(er)
