Czech National Calculation Tool

Czech National Calculation Tool logo

Published since October 2007 for use in the Czech Republic. The calculation method is based on the delivered energy needed under standard indoor and outdoor conditions. The basic process of the calculation is divided into two stages:

  • Calculation of energy demand (calculated on the standard use) of the building, or its zones; the calculation of heat losses, and heat gains, required in each space in order to maintain specified internal conditions;
  • Calculation of energy consumption (building, zones, according to the energy demands); the calculation of the energy required by the energy systems (boilers, AHU units, DHW systems, lighting, etc.) needed to provide the necessary heating or cooling, or humidity control, etc.

The calculation method is based on the simplified dynamic calculation. The energy demand can be calculated from monthly, daily, and hourly simplified values. Hourly calculations better represent the complexities of HVAC systems (mainly because of cooling) performance. Screen Shots

Keywords

EPBD, Energy Performance Certificate, Delivered energy, Energy Demand Calculation

Validation/Testing

Czech national and CEN standards were used for developing the Tool.

Expertise Required

Simple training.

Users

Approximately 500 users in the Czech Republic.

Audience

Energy auditors.

Input

Building geometry, thermal characteristics, schedules, efficiencies of boilers, coolers, appliances.

Output

Output tables with EP Certificate.

Computer Platform

Windows PC

Programming Language

MS Excel

Strengths

Easy to use

Weaknesses

MS Excel

Contact

Company:

Czech Technical University

Address:

Czech Republic

Telephone:

+420 224 354 570

E-mail:

k125@fsv.cvut.cz

Website:

http://tzb.fsv.cvut.cz/projects/nkn/?page=nastroj-nkn&NKN_SID=e7dcae58ce1eac5d5b86a895b60a729d

Availability

Freely available at:: http://tzb.fsv.cvut.cz/projects/nkn/?page=nastroj-nkn&NKN_SID=e7dcae58ce1eac5d5b86a895b60a729d