The global energy efficiency of the unit is about 15%.
The thermal efficiency of the unit (net work produced divided by energy added through the fuel) would be 48 percent.
In winter, he said, the heat pump is set to heating mode and it becomes a heater, although the efficiency of the unit decreases as the outside air gets colder.
Air- and water-purification efficiency of the unit was examined by high concentration of acetaldehyde and phenol decomposition test, respectively.
The objective is to optimize the energy conversion efficiency of the unit without affecting its damping control property.
This plant design allows one to minimize the heat dispersion enhancing the energy efficiency of the unit.
Modeling results show that the sediment collection efficiency of the unit for fine-grained sediment is about 14%.
Maximum efficiency of the unit was found to be 79%, marginally higher than that of the parent pump, while the off-design efficiency offered considerable improvement over previously published data of traditional PAT systems.
The results demonstrate that the gas boilers can effectively reduce the peak-load of the GHE, and therefore reduce the designed length of the buried pipe, solve the problem of underground thermal imbalance and improve the efficiency of the unit.
However, when the heat demand is low, the hot exhaust gases have to be directly blown off and the electrical efficiency of the unit (∼30%) is not high enough to sustain profitable operation.
