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[1] [2] To prevent the boiler from firing too frequently, aquastats have a high limit temperature and a low limit. If the thermostat is calling for heat, the boiler will fire until the high limit is reached, then shut off (even if the thermostat is still calling for heat). The boiler will re-fire if the boiler water temperature drops below a ...
A zone valve is a specific type of valve used to control the flow of water or steam in a hydronic heating or cooling system.. In the interest of improving efficiency and occupant comfort, such systems are commonly divided up into multiple zones. [1]
In variable-flow hydronic systems, reducing pump speed or staging of pumps with boilers and chillers to suit part-load conditions is an energy efficient method of control. [5] VAV (variable air flow) systems meet the needs of large modern commercial-use buildings, with internal spaces divided into open-plan areas.
Hot water reset, also called outdoor reset (ODR), is an energy-saving automatic control algorithm for heating boilers that are typically fired with fuel oil or natural gas. A hot water reset control loop measures the outside air temperature ; this information is used to estimate demand or heating load as the outdoor temperature varies.
Hydronics (from Ancient Greek hydro- 'water') is the use of liquid water or gaseous water or a water solution (usually glycol with water) as a heat-transfer medium in heating and cooling systems. [1] [2] The name differentiates such systems from oil and refrigerant systems.
The ASHRAE Handbook has had a variety of titles. [5] It began in 1922 as the ASH&VE Guide.In 1973 it became the ASHRAE Handbook, and in 1985 separate publication of inch-pound and international system units versions of the volumes began.
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