Charge operation strategy

Selection of charge operation strategy

The features of the hour-by-hour load of a building within the design cycle should be based on and the owner’s demand and the local electricity price structure should be considered simultaneously so as to make a reasonable arrangement of production and charge capacity and discharge and production operation optimization for the purpose of the optimal state of the initial investment and the operating cost.

FULL LOAD CHARGE

When the main machine of the chiller is not opened during the day, the STL system will discharge the energy stored to supply for the air conditioning system. Though the STL has a large capacity and high initial investment, its operating cost is the minimum. It applies to complete back-up energy or short-time cooling during the day and the situation with a large electricity price difference between peak and valley times.

 

 

BALANCED LOAD CHARGE

When the main chiller machine continuously operates, the STL device will discharge during the load peak. The utilization rate of the main chiller machine is the highest, the STL device has a small capacity and the initial investment in the system is the lowest. At present, most ice storage air-conditioning systems adopt this method.

CHARGE UNDER ELECTRICITY DEMAND LIMIT

When the main chiller machine stops or limitedly opens under electricity limit or electricity price peak, the deficiency will be supplied by the STL device. The utilization rate of the main chiller machine is low, the STL device has a large capacity, the initial investment in the system is high, and the saved operating cost is much. It applies to the areas with strict electricity limits (periods and quantity) or a large electricity price difference between peak and valley times.

EMERGENCY COLD SOURCE

When the main chiller machine continuously operates, the load will be supplied by the main chiller machine completely; however, in case of short-time power failure, the load will be supplied by STL device discharge. It applies to places needing emergency cold source such as data centers, blood banks, and hospitals, to meet the demand during power failure.

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