PAS 42:2002 pdf download Method of test for establishing the efficiency of decorative fuel effect gas fires
Scope
This Product Assessment Specification specifies requirements and test methods for measuring the efficiency ofdecorative fuel effect gas fires not exceeding a nominal heat input of 20 kW (based on net calorific value),hereinafter referred to as appliances.
Generally the safety and construction of these appliances is specified in European Standard BS EN 509
This document is not applicable to the following:
a) radiant convector and inset live fuel effect fires specified in BS 7977-1:
b) closed fronted and balanced flue appliances specified in BS EN 613;
cappliances incorporating a fan to assist the transportation of combustion air and/or combustion gasescovered by EN 1266 and prEN 13278
2Terms and definitions
For the purposes of this Product Assessment Specification the following definitions apply.
2.1
radiant convector [see Figure 1(a)gas fired appliance designed to heat a room mainly by the emission of air heated by convection. Such anappliance also contains vertical, or near vertical, mounted radiant elements designed to give maximum radiantoutput to the room. It is designed to be mounted on a hearth, floor or wall. t may be mounted wholly or partiallyinset into the void behind the fireplace opening
2.2
live fuel effect fire (LFE) [see Figure 1(a)]
gas fired appliance designed to heat a room mainly by the emission of air heated by convection. Such anappliance also contains radiant elements designed to simulate a solid fuel fire bed. It is designed to be mountedon a hearth,floor or wall
2.3
inset live fuel effect fire (ILFE) [see Figure 1(b)]live fuel effect fire (2.2) designed to be installed wholly or partially inset into the void behind the fireplace
opening
2.4
decorative fuel effect gas fire [see Figure 1(c)]
gas fired appliance designed to simulate a solid fuel appliance for decorative purposes and intended to beinstalled so that the products of combustion pass unrestricted from the firebed to the chimney or flue
2.5 Gases
2.5.1 reference conditions
for calorific values (temperature: 15 °C);
for gas and air volumes dry (brought to 15 °C and to an absolute pressure of1 013.25 bar) 1) .
2.5.2
calorific value
quantity ofheat produced by the complete combustion ofgas, at a constant pressure equal to 1 013.25 bar, of unit volume or unit mass ofgas, the constituents ofthe combustible mixture being taken at reference conditions and the products ofcombustion being corrected back to the reference conditions specified in 2.5.1
A distinction is made between the following:
the gross calorific value in which the water produced by combustion is assumed to be condensed
(symbol H s );
the net calorific value in which the water produced by combustion is assumed to be in the vapour state
(symbol H i );
units are either:
megajoules per cubic metre (MJ/m 3 ) ofdry gas at reference conditions; or
megajoules per kilogram (MJ/kg) ofdry gas.
2.5.3
relative density
ratio ofthe masses ofdry gas and dry air at the same conditions oftemperature and pressure
(symbol: d)