DIN Standards Committee Refrigeration Technology
Roof-top units
Abstract
document specifies the terms and definitions, the test conditions and the test methods of air-sourced and water-cooled roof-top units, driven by electric compressor(s), which may be equipped with a supplementary heater using electrical resistance or combustion of fossil fuel. This document covers roof-top units with 2, 3 or 4 dampers, including several features as the free-cooling, mixing air flows (on both sides) and heat recovery. This document deals with roof-top units providing space heating and/or cooling for comfort application. Process applications are not covered by this document. This document provides the part load conditions and the calculation methods taking into account roof-top units features for the determination of seasonal energy efficiency SEER and SEERon, seasonal space cooling energy efficiency ηs,c, seasonal coefficient of performance SCOP, SCOPon and SCOPnet, seasonal space heating energy efficiency ηs,h and the overall annual efficiency. Such calculation methods may be based on calculated or measured values. In case of measured values, this document covers the test methods for determination of capacities, EER and COP values during active mode at part load conditions. It also covers test methods for the determination of power input during thermostat-off mode, standby mode, off-mode and crankcase heater mode. A roof-top unit that is not using at least the thermodynamic cycle for space heating is considered as a cooling only unit. Roof-top units equipped with additional air heating and/or cooling heat exchangers will be rated without operation of these heat exchangers.
Begin
2019-07-29
WI
00113100
Planned document number
DIN EN 17625
Project number
04400314
Responsible national committee
NA 044-00-06 AA - Heat pumps with electrically driven compressors and air conditoners
Responsible european committee
CEN/TC 113/WG 15 - Roof-top units
draft standard
Roof-top units; German and English version prEN 17625:2020
2021-01
Order from DIN Media
