#York ycal chiller not staging properly full#
The selection of this equipment is driven by the individual efficiencies at full and partial loads, and also by how the system efficiency will respond to the building loads. This critical information is needed to identify the quantity and desired performance requirements of the equipment.Ī typical chiller plant consists of a chiller or multiple chillers, along with chilled water pumps, condenser water pumps, and cooling towers. It is important not just to have a grasp of the maximum and minimum load requirements, but also to understand the building load profile that identifies the time duration during part load events. This is best achieved by not only properly controlling each individual component of a chiller plant but also effectively controlling the entire system.Īccurately determining the chiller load is the first step.
#York ycal chiller not staging properly how to#
The challenge for design engineers is just how to maximize the comfort requirements while keeping energy costs to a minimum. In reality, this never happens due to system efficiencies, controllability, and the thermodynamic time lag that occurs in buildings. In an ideal world, the cooling required and subsequent energy use would exactly match. Rising energy costs and the demand for more precise temperature control are the driving factors for properly and efficiently controlling a chiller plant. As long as the space was cooler than the outdoors, a 5 or 10 F temperature swing was just fine.īack then and even now, the on/off concept is simple and works, although it does have a detrimental effect on operational life of the equipment. When there was cheap energy and the public was just thankful to be out of the heat and humidity, simple on/off control methods were perfectly acceptable. Mechanical components, such as compressor types and heat transfer surfaces, have changed in response to changing refrigerants and maximizing unit efficiencies.
Moving forward to the present, we find the same basic principles apply, but the delivery method is being constantly revised. Thus was born “human comfort cooling,” thanks to the acknowledged father of air conditioning, Willis Haviland Carrier. Until that point most air conditioning (cooling) was part of an industrial process. In 1924 the Hudson Department Store in Detroit became the first commercial building to have an air conditioning system specifically designed for human comfort.
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