Abstract
Thermohydraulic dispatcher (THD) can be widely used in district heating systems. Heat source is one of the possible places of its application. In this case, it is possible to achieve hydrodynamic separation of heat source and heat supply network. This paper deals with comparison of three types of heat substation connection to heat source: conventional system, DVSP system, THD-based system. The latter two have variable speed pumps instead of throttling valves. Based on electricity consumption and investment costs calculations, total discounted costs of three systems were estimated. In result, DVSP system is more beneficial, while conventional system and THD-based system have high operational and investment costs accordingly.
Highlights
Thermohydraulic dispatcher (THD) is a device of low hydraulic resistance allowing for hydrodynamic separation of circuits connected to it
Chinese researchers have found that application of hydraulic connector, the device with low differential pressure and similar to THD, along with variable speed pumps for district heating systems may lead to significant energy saving effect [8,9,10,11,12,13,14]
The goal of this paper is to compare three types of heat substation connection to heat source: conventional system (Figure 1), DVSP system proposed by Chinese researchers [8] (Figure 2), and the system with THD (Figure 3)
Summary
Thermohydraulic dispatcher (THD) is a device of low hydraulic resistance allowing for hydrodynamic separation of circuits connected to it. Application of THD for district heating systems can be beneficial in terms of electricity saving. Chinese researchers have found that application of hydraulic connector, the device with low differential pressure and similar to THD, along with variable speed pumps for district heating systems may lead to significant energy saving effect [8,9,10,11,12,13,14]. The goal of this paper is to compare three types of heat substation connection to heat source: conventional system (Figure 1), DVSP system proposed by Chinese researchers [8] (Figure 2), and the system with THD (Figure 3). Conventional system includes throttle valves, while two other systems have variable speed pumps and hydraulic connector or THD installed at heat source station. Power consumption of three systems was estimated and economic calculations for Russian conditions were performed
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