1. INTRODUCTION<br>

# 1. Introduction

## 1.1. Program purpose and scope of calculations

Program Instal-heat&energy is designed for designers of central heating systems. It has been designed for calculations of overall heat-transfer coefficients „U” (or heat resistance “R”) of building partitions, heat loss in compartments and seasonal energy demand in apartment buildings and office buildings. The program can also select preliminary the unit heaters of central heating system from available catalogues.

Due to considerable possibilities of data modification it enables also performing of analysis of heat loss interdependence on individual building parameters, such as thermal insulation parameters, window dimensions and others, as well as evaluation of effects of possible thermo-modernization actions in existing building by calculating the energy consumption without and with consideration of effects of this actions.

For this reason the program can be also successfully used by power engineers, architects and power engineering auditors for evaluation of energy-saving investments in apartment buildings.