cove.tool refers the standard ISO 13790 Energy performance of buildings - Calculation of energy use for space heating and cooling for pump energy calculation. Pump energy is an auxiliary energy use related to circulation heating and cooling fluid throughout a building. Similar to air systems, better controls for pumps help reduce energy use within a building.
The adjustment factors present in the tool are to quantify the savings from controls in stages.
No Pump: Indicates the system has no pumps (for example a VRF system) and therefore does not have additional pumping energy.
Auto Pump 50 Percent: Indicates the pumps are controlled according to the demand on each circuit leading to reduced energy use.
All Other Cases: Indicates the pumps are not well controlled, leading to more energy use in the project.
The Auto Pump 50 Percent is the most energy efficient option and should be considered for any project seeking to reduce energy use. No Pump should only be applied for systems that do not have fluid distribution systems, for example electric resistant heat systems. If you have no information about the proposed pumping strategy, All Other Cases will provide a baseline estimate of the energy used.