Heating systems in buildings. Method for calculation of the design heat load

District heating is an efficient way to provide heat to residential, tertiary and industrial users. The heat storage unit is an insulated water tank that absorbs surplus heat from the boiler. The stored heat in the heat storage unit makes it possible to heat even when the boiler is not working, thus increasing the heating efficiency. In order to save primary energy (fuel), the boiler operates on nominal load every time it is in operation (for the purpose of this research). The aim of this paper is to analyze the water temperature variation in the heat storage, depending on the heat load and the heat storage volume. Heat load is calculated for three reference days, with average daily temperatures from -5 to 5?C. The primary energy savings are also calculated for those days in the case of using heat storage in district heating.

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The Matching Research of Soil Source Heat Pump and Central Heating System in Cold Region

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.805-806.486 ◽

2013 ◽

Vol 805-806 ◽

pp. 486-491

Author(s):

Yue Ren Wang ◽

Yu Feng Jiang ◽

Min Yu

Keyword(s):

Heat Pump ◽

Heat Load ◽

Working Condition ◽

Heating System ◽

Cold Region ◽

Pump System ◽

Heat Pump System ◽

Heating Systems ◽

Central Heating ◽

Practical Engineering

Using Dest software simulation benchmark building the dynamic heat load, analyzing its distribution pattern, at the same timewe can also get heat pump units in the COP value is different under different working condition, then the soil source heat pump and central heating complementary heating system, undertake in soil source heat pump system design heat load, under theconditions of different proportion of the whole system operation energy consumption, initial investment analysis, we conclude thatthe soil source heat pump and central heating complementary heating systems of different energy matching optimization features,this provides a reference for practical engineering.

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Reduction of Conveyance Power Consumption of District Cooling and Heating Systems using Demand-Supply Coordinated Control

E3S Web of Conferences ◽

10.1051/e3sconf/201911106008 ◽

2019 ◽

Vol 111 ◽

pp. 06008

Author(s):

Osamu Kunitomo ◽

Isao Satoh ◽

Masanori Hiroshima

Keyword(s):

Heat Source ◽

Power Consumption ◽

Heat Transport ◽

Heat Load ◽

Relative Rate ◽

Coordinated Control ◽

Heating Systems ◽

Supply Pressure ◽

Load Following ◽

Appearance Frequency

This study aims to discuss the effectiveness of “Demand-Supply Coordinated control” in reducing the power consumption required for conveyance by the heat transport medium in District Cooling and Heating (DHC) systems. The problem with DHC systems is that increased conveyance power is required to provide heating to consumers. As one of the measures to solve this problem, Demand-Supply Coordinated (DSC) control is introduced; however, its effectiveness and limitations have not been clarified so far. In this paper, first, the fundamental characteristics of a DHC system under DSC control are numerically examined. The results showed that the conveyance power consumption of DHC systems under DSC control can be classified into three regions, depending on the relative rate of demand change against the load-following capability of the heat source. Next, the authors compared the conveyance power of DSC control with that of Constant Supply Pressure (CSP) control adopted in conventional DHC, and showed regularity for each of the three regions mentioned above. Finally, the authors show the appearance frequency of these three regions of the practical DHC system under a real heat load in Japan. The results showed that the conveyance power required for DSC control is markedly lower than that of CSP control.

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