scope:

This guideline specifies the calculation of the energy effort for distribution, i. e. a connection system between a central heat generator or chiller and distributed points of transfer. Within the distribution system, heat is conveyed to, or away from, the points of transfer. Water is the most commonly used heat transfer fluid. Distribution systems using other heat transfer fluids (such as vapour, refrigerant, hot oil) are not explicitly broached in this guideline but are to be treated along analogous lines.

Both the energy effort for the heat output from the distribution system to the environment and the energy effort for water circulation must be determined. The former thermal effort arises as additional demand for generation, the latter electrical effort arises either in central circulating pumps arranged near the generation system or in distributed variable-capacity pumps allocated to the transfer points. In central pumps, throttle valves ensure the desired distribution; distributed pumps control the supply to the individual transfer points. The procedure for determining the energy effort is explicitly described in this guideline for the case of heating systems. It can be applied analogously to chilling systems.

The guideline is part of a system formed along with the other parts of the series of guidelines VDI 2067 and shall be used in conjunction with these guidelines.