A method of determining the thermal power demand of buildings connected to the district heating system with usage of heat accumulation

Michał Turski,Robert Sekret,B Kaźmierczak,J Danielewicz,M Kutyłowska,K Piekarska,H Jouhara

doi:10.1051/e3sconf/20172200180

Michał Turski, Robert Sekret + Show 5 more

Open Access

https://doi.org/10.1051/e3sconf/20172200180

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Abstract

The paper presents a new method of determining the thermal power demand of buildings connected to the district heating system, which included the actual heat demand and the possibility of balancing the thermal power using the thermal storage capacity of district heating network and internal heat capacity of buildings. Moreover, the analysis of the effect of incidence of external air temperature and duration of episodes with the lowest outdoor temperatures on the thermal power demand of district heating system was conducted.

Highlights

One way to reduce pollution from dispersed sources of low power can be a significant development of district heating systems
The proposed method consists of seven stages: analysis of the hourly frequency of outside air temperatures, analysis of average daily outside air temperature, analysis of frequency and duration of episodes with the lowest values of outside air temperature, determine the actual thermal power demand of buildings, analyse of the possibility of balancing the thermal power using the thermal storage capacity of district heating network, analyse of the possibility of balancing the thermal power using the internal heat capacity of buildings and determine the reduction in demand for thermal power of district heating system
On the basis of presented determining the thermal power demand of buildings connected to the district heating system with usage of heat accumulation can draw following conclusions: Having regard to the incidence of outside air temperatures, and the frequency and duration of episodes with the lowest values of outside air temperature the most possible source thermal power reduction for the purpose of central heating is 5–10%

Summary

Introduction

One way to reduce pollution from dispersed sources of low power (i.e. low emission) can be a significant development of district heating systems. One of the barriers to the development of district heating systems is that the buildings connected to the district heating network are highly volatile of daily demand for thermal power, what causes problems when is designing power of heat sources in the district heating system. Sources of heat are designed with more power due to the anticipated development of the buildings infrastructure and future demand for thermal power This trend does not necessarily have to be maintained because of the intense thermal modernization of existing buildings and use new building technologies with extremely low heat consumption [9,10,11]. Into account the thermal storage capacity of district heating network and internal heat capacity of buildings [12, 13] In this material it is important to present a new calculation method and a new perspective on problem of current oversizing of heat sources capacities of district heating systems. New method includes the actual heat demand and the possibility of balancing the thermal power using the thermal storage capacity of district heating network and internal heat capacity of buildings

Method of determining the thermal power with usage of heat accumulation

Discussion

Conclusions