Peak shaving
- Agota Szedlak
- Jul 8
- 1 min read
In the analyzed system, the cooling demand is met jointly by a ground-source heat pump and a chiller. The majority of the cooling load is covered by the ground-source heat pump due to its more economical operation (it has a higher EER value). The peak demand is covered by the chiller (the capacity of the heat pum is 2.7 times more than the capacity of the chiller).The chart below shows the cooling performances over the course of a day:
![Cooling performance [kW]](https://static.wixstatic.com/media/9c9992_d605569179904f9f94b0df68fe524f31~mv2.png/v1/fill/w_980,h_465,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/9c9992_d605569179904f9f94b0df68fe524f31~mv2.png)
![Cooling electricity demand [kW]](https://static.wixstatic.com/media/9c9992_73eda3e3c8a144c0a90855d9a4ea4a73~mv2.png/v1/fill/w_980,h_461,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/9c9992_73eda3e3c8a144c0a90855d9a4ea4a73~mv2.png)
Using the EER, it can be determined that the chiller's electricity consumption exceeds that of the heat pump, even though its cooling capacity is significantly lower.
With the HeatTank Intelligent Thermal Battery, the cooling peak demand can be reduced by 18% by decreasing the chiller’s performance.
![Cooling performance [kW]](https://static.wixstatic.com/media/9c9992_fbe1669f1ba64bee9c09e9338d083c7f~mv2.png/v1/fill/w_980,h_488,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/9c9992_fbe1669f1ba64bee9c09e9338d083c7f~mv2.png)
![Cooling electricity demand [kW]](https://static.wixstatic.com/media/9c9992_cd0c2e62237c4f11b9122c5d3014f5ea~mv2.png/v1/fill/w_980,h_485,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/9c9992_cd0c2e62237c4f11b9122c5d3014f5ea~mv2.png)
In the chart on the right, the blue dotted line shows the chiller’s electricity consumption without thermal battery. With an 18% peak reduction, the HeatTank Intelligent Thermal Battery decreases the peak electricity demand by 30%.