Operation of Geothermal Heat Plant Supplied the Distribution Network with High- and Low-Temperature Receivers Connected in Series in Comparison with Receivers Connected in Parallel

Abstract

In this publication the conclusions of theoretical analysis concerning possibilities of medium-enthalpy (40?C 90?C) geothermal water utilisation supplying the distribution network, which consists of in-series or parallel connected heat users featuring different operational requirements will become.
The main components of the heating system are production-reinjection geothermal wells, geothermal heat exchanger and peak boiler as an additional heat source. Heat is transferred to the distribution network of receivers equipped with high-temperature heating systems (e.g. radiator heating, tap water) and low-temperature systems (e.g. floor heating, snow melting).
Two different types of configuration are considered: I) users connected to the geothermal heat plant in series; II) users connected to the geothermal heat plant in parallel. In this last arrangement analysis also refers to two variants (IIa, IIb), in of which in first priority have high-temperature receivers instead of second variant where receivers are equivalent.
In calculations it was taken into account variable users' participation of heat demand in total demand for the thermal power. Obtained results will attend to select effective variants of geothermal heat plant operation and to indicate best possibilities of utilization of medium-enthalpy geothermal water.