Abstract
Widely developed DH systems in Lithuanian towns and small settlements undergo modernisations aimed to increase their efficiency and heat supply quality. Typically, modernisations include the replacement of building heat substations, the reduction of heat losses in pipes and more efficient heat production, including the use of indigenous fuel resources. It was notified that new heat substations equipped with automatic heating control devices have backward impact on the technological parameters of DH networks. Modelling tools for simulation of hydraulic and thermal parameters in the network allow estimating of potential deviation of heat carrier temperature with loading variations not only during the season of the year, but also over day and night. Special technical measures can be taken to avoid unduly low heat carrier supply temperatures and violation of hot water supply quality requirements. Cost estimation of such measures versus the option of full network renovation is presented in the article.
Highlights
Prevailing heat supply regulation method in district heating (DH) supply systems recently was so-called qualitative regulation based on different heat carrier temperatures depending on outside climate conditions: air temperature, strength of wind
Results of the simulation at the above assumptions demonstrate that probability of violation of heat supply quality is rather high for distant consumers
The calculated loading variation in the boiler-house is relatively less than the consumers demand variation because of approximately constant additional heat demand for compensating heat losses in DH network
Summary
Prevailing heat supply regulation method in DH supply systems recently was so-called qualitative regulation based on different heat carrier temperatures depending on outside climate conditions: air temperature, strength of wind. Heat exchangers for domestic hot water (DHW) heating-up typically are connected directly. Such a simple regulation of heat supply, needs well-balanced DH network and internal heat distribution systems in buildings. Installing modern building substations, equipped with automatic heating control devices and balancing of internal heat distribution systems is the solution to the problem [1]. Such substation regulates temperature and amount of heat supplied to the building, and changes flow rate of heat carrier, passing the substation. Flow rate of heat carrier at the boiler-house varies and heat supply regulation pattern becomes more complicated including both the qualitative and quantitative elements
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