What is a central chiller plant?
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What is a central chiller plant?
Stationary & Portable Central Air Cooled Chillers The term “central air-cooled chiller” refers to any central chiller system that can cool several processes throughout a plant at the same time. A central chiller plant can be stationary or portable.
What is the main parts of central chiller plant?
Chillers consist of four basic components; an evaporator, a compressor, a condenser, and an expansion unit.
How does a central chiller plant work?
A chiller works on the principle of vapor compression or vapor absorption. Chillers provide a continuous flow of coolant to the cold side of a process water system at a desired temperature of about 50°F (10°C).
How do you size a chiller plant?
General sizing formula:
- Calculate Temperature Differential (ΔT°F) ΔT°F = Incoming Water Temperature (°F) – Required Chill Water Temperature.
- Calculate BTU/hr. BTU/hr.
- Calculate tons of cooling capacity Tons = BTU/hr.
- Oversize the chiller by 20% Ideal Size in Tons = Tons x 1.2.
- You have the ideal size for your needs.
What is central plant system?
A central plant system serves several buildings with a heating and/or cooling medium from a central plant source using four components: 1. Energy sources (usually electric power and fossil fuels) 2. Systems to convert the energy sources to thermal energy, (usually chilled and hot water)
Which components are used in Ahu of central AC plant?
The main components of the air handling unit shown in Figure 1 are described below:
- Supply fan . Centrifugal fan type is used to provide the conditioned air to various zones.
- Fan motor .
- Cooling coil .
- Filters .
- Mixing box .
- Dampers .
- Heating coil .
- Preheating coil .
What are the parameters of chiller?
Chiller evaporator
- Fluid or Air Inlet temperature and pressure.
- Fluid or Air Outlet temperature and pressure.
- Refrigeration inlet and outlet temperature.
- Insulation Condition.
What is chiller plant approach?
Condenser approach temperature is simply defined as the difference between the condenser liquid refrigerant temperature and the outlet condenser water temperature. The closer these temperatures are to each other, the more efficient the heat transfer.
How is chiller calculated?
Use the formula Q = M X C X ΔT where:
- Q = heat load in British Thermal Units per Hour (BTUH)
- M = flow in Gallons per Hour (GPM)
- C = specific heat of the fluid.
- ΔT = temperature difference in degrees Fahrenheit.
- Q = 500 BTU per gallon per hour X 40 GPM x 12 ΔT = 240,000 BTU per hour.
How is chiller plant COP calculated?
Electric motor driven chillers are rated in kilowatts per ton cooling.
- kW/ton = 12 / EER.
- kW/ton = 12 / (COP x 3.412)
- COP = EER / 3.412.
- COP = 12 / (kW/ton) / 3.412.
- EER = 12 / (kW/ton)
- EER = COP x 3.412.
What is the difference between AHU and RTU?
An RTU is a type of AHU. AHU stands for Air Handling Unit and the acronym RTU means Rooftop Unit. The Roof Top Unit is an outdoor AHU. As RTUs are mounted on the roof, there is no concern about creating extra space indoors for it as would be the case for the other types of AHU.
