- Email: [email protected]
Roof-top installation
no
a
No u velles de I "industrie Small lot production of CFC refrigerant replacement The Du Pont Company has started up a small lot production facility to produce developmental quantities of a compound that shows promise as a replacement for a chlorofluorocarbon (CFC) used primarily in refrigeration applications. The plant, located at the company's Chambers Works in Deepwater, New Jersey, USA, is producing HFC 134a. This has been identified as a leading candidate to replace CFC 12, currently used as a blowing agent and refrigerant in a number of applications, primarily household refrigerators and automobile air conditioners. Initial quantities of the product will be used for customer testing and preliminary toxicity testing. HFC 134a is one of two compounds that will be evaluated through a joint toxicity testing programme recently announced by a group of CFC producers, including Du Pont. HFC 134a has no ozone depletion potential. Because it contains a hydrogen atom, the compound is less stable than existing CFCs. The stability of fully halogenated CFCs has led to concerns that they may interfere with the earth's protective ozone layer because they do not break down until they reach the stratosphere. Certain existing CFCs with high ozone depletion potential will be regulated through an international agreement signed in Montreal in September 1987. When the agreement is ratified by nations accounting for two-thirds of CFC consumption, fully halogenated CFC consumption will be frozen at 1986 levels in mid1989, reduced by 20% in mid-1993, and by an additional 30% by mid1998. Du Pont has invested more than US$30 million in alternatives research since the mid-1970s, and over US$10 million in 1987 alone, and is dedicated to being the first to
344
commercialize CFC alternatives. Assuming favourable toxicology results, successful process research, and adaptation to customer processes and equipment, commercial facilities could start up as early as 1992. Du Pont de Nemours International SA, PO Box, CH-1211 Geneva 24, Switzerland.
Roof-top installation Offereing a flexible means for air conditioning large commercial and industrial premises, the Frimair RTC/RTCH series of packaged units is specially designed for roof-top installation. They can either be incorporated in the roof structure during building, or installed on the completed roof prior to occupation of the premises, thus avoiding damage while building work is in progress. The Frimair units feature either one or two fully hermetic compressors independently circuited and resiliently mounted. A double-inlet centrifugal fan, also resiliently mounted with sealed-for-life bearings, is provided with a flexible coupling.
Condenser fan speed control The PGE, manufactured by Saginomiya of Japan, senses condenser pressure and modulates the speed of the condenser fan(s) to maintain a constant pressure. It is suitable for single phase fans with a full load capacity of up to 8 A. Two options are available for controlling fan speed when condensing pressure drops to its lowest setting. The fan motor can either continue running at the minimum speed set on the PGE, or it can cut out completely, only re-starting as condensing pressure increases. This latter option is particularly advantageous in allowing a rapid build-up of condensing pressure during a cold start.
Int. J. Refrig. 1988 Vol 11 September
All the electrical equipment conforms to appropriate ISO standards and is located inside a separate compartment, with a terminal block for remote control and the fitting of fault indication. Electrical connections can be made from inside or outside the premises. Access, for maintenance or service, is readily gained through removable doors, sealed against water ingress. Filters are mounted on guide bars which are also easily reached. They conform to Class M1, with 73~o efficiency, measured by the ASHRAE gravimetric test. Additions include hot water and electric heating coils and a fresh air economizer section for cooling by outside air only, where applicable. The RTC models offer cooling capacities from 31.1 to 133kW, whilst the RTCH units range from 42.9 to 161.2 kW (50 Hz models) and 41.8 to 167.6 kW (60 Hz). The RTC unit is also available as a heat pump to provide heating and cooling economy. The nominal air flow rates for the RTC and RTCH models extend from 7200 to 30000 m 3 h -1. Delrac Ltd, 128 Malden Road, New Malden, Surrey KT3 6DA, UK. The PGE is available for both R22 and R12, and has applications on both air conditioning and refrigeration systems. Thermofrost Cryo Ltd, Robert Fawkes House, Rea Street South, Birmingham B5 6LB, UK.
PGE condenserfan speedcontrol
a
No u velles de I "industrie Small lot production of CFC refrigerant replacement The Du Pont Company has started up a small lot production facility to produce developmental quantities of a compound that shows promise as a replacement for a chlorofluorocarbon (CFC) used primarily in refrigeration applications. The plant, located at the company's Chambers Works in Deepwater, New Jersey, USA, is producing HFC 134a. This has been identified as a leading candidate to replace CFC 12, currently used as a blowing agent and refrigerant in a number of applications, primarily household refrigerators and automobile air conditioners. Initial quantities of the product will be used for customer testing and preliminary toxicity testing. HFC 134a is one of two compounds that will be evaluated through a joint toxicity testing programme recently announced by a group of CFC producers, including Du Pont. HFC 134a has no ozone depletion potential. Because it contains a hydrogen atom, the compound is less stable than existing CFCs. The stability of fully halogenated CFCs has led to concerns that they may interfere with the earth's protective ozone layer because they do not break down until they reach the stratosphere. Certain existing CFCs with high ozone depletion potential will be regulated through an international agreement signed in Montreal in September 1987. When the agreement is ratified by nations accounting for two-thirds of CFC consumption, fully halogenated CFC consumption will be frozen at 1986 levels in mid1989, reduced by 20% in mid-1993, and by an additional 30% by mid1998. Du Pont has invested more than US$30 million in alternatives research since the mid-1970s, and over US$10 million in 1987 alone, and is dedicated to being the first to
344
commercialize CFC alternatives. Assuming favourable toxicology results, successful process research, and adaptation to customer processes and equipment, commercial facilities could start up as early as 1992. Du Pont de Nemours International SA, PO Box, CH-1211 Geneva 24, Switzerland.
Roof-top installation Offereing a flexible means for air conditioning large commercial and industrial premises, the Frimair RTC/RTCH series of packaged units is specially designed for roof-top installation. They can either be incorporated in the roof structure during building, or installed on the completed roof prior to occupation of the premises, thus avoiding damage while building work is in progress. The Frimair units feature either one or two fully hermetic compressors independently circuited and resiliently mounted. A double-inlet centrifugal fan, also resiliently mounted with sealed-for-life bearings, is provided with a flexible coupling.
Condenser fan speed control The PGE, manufactured by Saginomiya of Japan, senses condenser pressure and modulates the speed of the condenser fan(s) to maintain a constant pressure. It is suitable for single phase fans with a full load capacity of up to 8 A. Two options are available for controlling fan speed when condensing pressure drops to its lowest setting. The fan motor can either continue running at the minimum speed set on the PGE, or it can cut out completely, only re-starting as condensing pressure increases. This latter option is particularly advantageous in allowing a rapid build-up of condensing pressure during a cold start.
Int. J. Refrig. 1988 Vol 11 September
All the electrical equipment conforms to appropriate ISO standards and is located inside a separate compartment, with a terminal block for remote control and the fitting of fault indication. Electrical connections can be made from inside or outside the premises. Access, for maintenance or service, is readily gained through removable doors, sealed against water ingress. Filters are mounted on guide bars which are also easily reached. They conform to Class M1, with 73~o efficiency, measured by the ASHRAE gravimetric test. Additions include hot water and electric heating coils and a fresh air economizer section for cooling by outside air only, where applicable. The RTC models offer cooling capacities from 31.1 to 133kW, whilst the RTCH units range from 42.9 to 161.2 kW (50 Hz models) and 41.8 to 167.6 kW (60 Hz). The RTC unit is also available as a heat pump to provide heating and cooling economy. The nominal air flow rates for the RTC and RTCH models extend from 7200 to 30000 m 3 h -1. Delrac Ltd, 128 Malden Road, New Malden, Surrey KT3 6DA, UK. The PGE is available for both R22 and R12, and has applications on both air conditioning and refrigeration systems. Thermofrost Cryo Ltd, Robert Fawkes House, Rea Street South, Birmingham B5 6LB, UK.
PGE condenserfan speedcontrol