Energi- og varmeoverføringsteknikk

Emner: Gassbrennere
Komité: CEN/TC 58 (Safety and control devices for burners and appliances burning gaseous or liquid fuels)
Opprinnelse:
Sluttdato: 9. jul 2020
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This document specifies the safety, construction and performance requirements for mechanical thermostats intended for use with gas appliances and similar use, hereafter referred to as ‘thermostats’. This document applies to thermostats with declared maximum inlet pressures up to and including 50 kPa (500 mbar) of nominal connection sizes up to and including DN 50 for use with one or more fuel gases in accordance with EN 437. This document applies to thermostats controlling the gas flow directly or indirectly through an integral gas valve. This document only applies to thermostats used with gas appliances which are not installed in the open air. Thermostats dealt with in this document are intended for control functions. This document is not applicable to: a) the thermocouple; b) controls which use auxiliary energy (e.g. electrical energy supplied externally); c) an assessment of the control regarding Performance Level (PL) and Safety Integrity Level (SIL).
Komité: CEN/TC 110 (Heat exchangers)
Opprinnelse:
Sluttdato: 30. jul 2020
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This document specifies methods to be used for testing of air-to-air heat recovery components (HRC). The main purpose of the HRC is to exchange heat between exhaust air and supply air in order to save energy, which results in — preheat or heat, and/or — precool or cool supply air in ventilation systems or air conditioning systems. Optionally HRC can exchange air humidity between exhaust and supply air. The HRC contains the heat exchangers and all necessary features and auxiliary devices for the exchange of sensible heat and (if available) air humidity between exhaust air and supply air. The HRC will be installed in casings or ducts. If fans are part of the test unit, the effect of the fan power on the measured values will be corrected. This document specifies procedures and input criteria required for tests to determine the performance of a HRC at one or several test conditions, each of them with continuous and stationary air flows, air temperatures and humidities at both inlet sides. Three different test types are covered: — Test type A, Laboratory testing of HRC installed in test casings (A1) or a HRC sections (A2); — Test type B, Laboratory testing of HRC installed in non-residential ventilation units in design configuration; — Test type C, On-site (field) testing of HRC in non-residential ventilation units (C1) or a HRC sections (C2) in operation configuration. This document is applicable to recuperators, regenerators, and HRC with intermediary heat transfer medium. This document prescribes test methods for determining: 1) the temperature and humidity efficiency, 2) the pressure drop of exhaust air and supply air sides, 3) possible internal leakages; exhaust air transfer ratio (EATR) and outdoor air correction factor (OACF), 4) external leakages and 5) auxiliary energy used for the operation of the HRC. HRC using heat pumps are not covered by this document.
Emner: Gassbrennere
Komité: CEN/TC 58 (Safety and control devices for burners and appliances burning gaseous or liquid fuels)
Opprinnelse:
Sluttdato: 30. jul 2020
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This document specifies the safety, construction and performance requirements for thermoelectric flame supervision devices, energized by a thermocouple intended for use with gas burners, gas appliances and similar use, hereafter referred to as “controls”. This document is applicable to controls with declared maximum inlet pressures up to and including 500 kPa (5 bar) of nominal connection sizes up to and including DN 50 for use with one or more fuel gases in accordance with EN 437. This document is not applicable to: a) the thermocouple; b) controls which use auxiliary energy (e.g. electrical energy supplied externally).
Emner: Gassbrennere
Komité: CEN/TC 58 (Safety and control devices for burners and appliances burning gaseous or liquid fuels)
Opprinnelse:
Sluttdato: 30. jul 2020
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This European Standard specifies the safety, design, construction, and performance requirements and testing for gas filters for burners and appliances burning one or more gaseous fuels. This European Standard is applicable to: — gas filters with declared maximum inlet pressure up to and including 600 kPa, of nominal connection size up to and including DN 250 for use with one or more fuel gases in accordance with EN 437:2009; — gas filters specified as pressure accessories as defined by EU Directive 2014/68/EU (see Annex F). NOTE 1 For pressure accessories, the requirements of EN 13611:2019, Annex F also apply. NOTE 2 Requirements for pressures above 500 kPa are considered in sub-clause 6.3.1 by referring to EN 13611:2019, Annexes F to H. This European Standard is not applicable to gas filters that are connected directly to mains pipe-work or to a container that maintains a standard distribution pressure.
Emner: Kuldeteknikk
Komité: CEN/TC 413 (Insulated means of transport for temperature sensitive goods with or without cooling and/or heating device)
Opprinnelse:
Sluttdato: 30. jul 2020
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This European standard applies to eutectic cooling devices which are intended to be used with insulated transport equipment. The following applications are covered: • Eutectic cooling devices with or without compressor /condenser unit intended to be installed into insulated means of transport (e.g. lorries, trailers, swap bodies, other transport containers and wagons). Charging of the eutectic elements from the liquid to the solid phase may be performed either by a compressor/condenser unit mounted onto the vehicle or cooled by a stationary direct or indirect system. The eutectic cooling devices are equipped, if relevant, with necessary components for the charging, transmission, cooling and/or with temperature control devices. The eutectic elements can be fitted with or without fans. • Eutectic cooling devices with independent eutectic elements which have to be charged using external means. This standard specifies the testing methodologies. This standard is only applicable for mono-temperature eutectic cooling devices. This standard does not provide any safety requirements.