1. Heat consumption for hot water supply in residential buildings
Karina TUMANOVA, Anatolijs BORODINECS
Institute of Heat, Gas and Water Technology, Faculty of Civil Engineering, Riga Technical University

2. Objectives The aim of the research was to determine heat energy
consumption for hot water preparation in residential
buildings.
Tasks:
To analyze the dynamics of the hot water consumption during the year;
To compare the results with values in the Regulations of Building Standard LBN ;
To determine the heat energy consumption for preparing 1 m³ of hot water .

3. Methods
The comparison method – to analyze the functioning of the hot water supply system. The economic analysis - to compare the functional aspects of solutions and to determine the preconditions, which lead to the opportunity to reduce costs of construction and aperation of the hot water supply system.

4. Results
The average hot water consumption in the heating period exceeds the consumption in summer period by 15%. The consumption of hot and cold water is different during the year.
The real measured hot water consumption rate per person per day compiles in average from 41 liters to 49 liters. The actual consumption is more than two times less than the normative value.
The consumption of the heat energy for the preparation of 1 m³ of hot water is different comparing summer and heating periods and makes out 53.3 kWh in average per year.