- Email: [email protected]
Temperature sensor for mixing vats
Nouvetles de I'industrie the most tightly packed products before it is refrigerated. The relatively warm air extracted from the products is confined to the plenum tunnel, ensuring that a uniform temperature is maintained throughout the chilling room. This prevents condensation forming on previously-chilled products stacked nearby. The units can chill up to 48 pallet loads at a time and keep large stocks of products cold for long periods. This reduces handling and consequent risk of damage and deterioration. Because the temperature in their air cooling chambers is always just above freezing point the units never need to be defrosted. No ice can accumulate, therefore the compressors can not become overloaded. Units with cooling capacities of 8.5102 kW are available, suitable for cold stores capable of holding up to 100t. Applications of the coolers include chilling fruit, vegetables, meat, poultry and fish, and storing heatsensitive industrial products. Field heat can be removed from ripened or newly-harvested produce in lq5 h. Bietech Limited, Windsor House, 24 Wycombe Lane, Wooburn Green, Buckinghamshire HP10 0HE, UK.
Heat recovery chillers A range of large heat recovery chillers has been introduced by Tri-Therm Ltd. These chillers extend the previous maximum rating of 296kW; HRAC types are now produced up to 4OOkW and HRWC types up to 900 kW. Both types of chiller are designed for process cooling applications. HRAC chillers are air cooled and use reclaimed heat to supply warm air at 35-40°C for space heating. HRWC chillers are water cooled, via an external cooling tower; reclaimed heat provides a hot water supply at 50-55°C. The chillers achieve coefficients of performance of about 3:1 (that is, more than 3 kW of heat output for every 1 kW of electrical power input).
310
Temperature sensor for mixing vats Siting heat sensors in mixing vats to obtain accurate readings of product temperatures can present a problem when mixing paddles have to be shaped to fit within a few millimetres of the inside of the vat. This occurs in many industries, particularly in food manufacture where steam jacketed vats are often used for cooking or where liquid CO 2 is injected to cool material being chopped. However, this problem can be eliminated with temperature sensor units from Nulectrohms Limited, in which a platinum resistance thermometer sensor is bonded to the inner surface of the crown of a 'top hat' section stainless steel probe. This enables insertion through the wall of a vat with the end presenting a flush surface with the inside. The brim and sides of the 'top hat' housing are of heavy construction to allow it to be held against and 'O' ring without danger of distortion. The top of the hat is also very thin, enabling the sensor to be placed as close as possible to the media being processed. Nulectrohms Limited, Meppershall, Shefford, Bedfordshire SG17 5LX, UK. Energy cost savings could, therefore, repay the initial investment in less than one year. Tri-Therm (Temperature Controls) Limited, Unit 4, Brook Street, Colchester, Essex CO1 2UZ, UK.
400kW HRAC heat recovery chiller (panels removed)
I nt, J. Refrig. 1 987 Vol 10 September
VP air-cooled chiller
Budget chiller A range of budget VP air-cooled chillers is now available from F&R Cooling Ltd. The chillers meet the varied demands of modern day cooling requirements, incorporating the latest process cooling technology with the most up-to-date refrigeration techniques. The VP chillers are fully selfcontained with all operating and safety controls. There are six models with 6-30kW nominal capacity. Each has a high pressure pump circuit constructed entirely from nonferrous components. The circuit also includes a stainless steel exchanger, enabling efficient cooling of a wide range of liquids, such as water/ glycol, de-mineralized water and oil. Temperature is controlled by a solid state thermostat with digital temperature display (accurate to +I°C). Thus, the VP chiller is versatile, operating at both very low process temperatures and very high ambient temperatures. (Fluids leave the VP chiller at temperatures ranging from +20 to -10°C in ambients up to 43°C.) The units are designed to need a minimum of attention and for customer's own on-site commissioning. They are fully tested before dispatch and each unit carries a full 12 months warranty. F&R Cooling Limited, Wellington, Somerset TA21 8ST, UK.
Heat recovery chillers A range of large heat recovery chillers has been introduced by Tri-Therm Ltd. These chillers extend the previous maximum rating of 296kW; HRAC types are now produced up to 4OOkW and HRWC types up to 900 kW. Both types of chiller are designed for process cooling applications. HRAC chillers are air cooled and use reclaimed heat to supply warm air at 35-40°C for space heating. HRWC chillers are water cooled, via an external cooling tower; reclaimed heat provides a hot water supply at 50-55°C. The chillers achieve coefficients of performance of about 3:1 (that is, more than 3 kW of heat output for every 1 kW of electrical power input).
310
Temperature sensor for mixing vats Siting heat sensors in mixing vats to obtain accurate readings of product temperatures can present a problem when mixing paddles have to be shaped to fit within a few millimetres of the inside of the vat. This occurs in many industries, particularly in food manufacture where steam jacketed vats are often used for cooking or where liquid CO 2 is injected to cool material being chopped. However, this problem can be eliminated with temperature sensor units from Nulectrohms Limited, in which a platinum resistance thermometer sensor is bonded to the inner surface of the crown of a 'top hat' section stainless steel probe. This enables insertion through the wall of a vat with the end presenting a flush surface with the inside. The brim and sides of the 'top hat' housing are of heavy construction to allow it to be held against and 'O' ring without danger of distortion. The top of the hat is also very thin, enabling the sensor to be placed as close as possible to the media being processed. Nulectrohms Limited, Meppershall, Shefford, Bedfordshire SG17 5LX, UK. Energy cost savings could, therefore, repay the initial investment in less than one year. Tri-Therm (Temperature Controls) Limited, Unit 4, Brook Street, Colchester, Essex CO1 2UZ, UK.
400kW HRAC heat recovery chiller (panels removed)
I nt, J. Refrig. 1 987 Vol 10 September
VP air-cooled chiller
Budget chiller A range of budget VP air-cooled chillers is now available from F&R Cooling Ltd. The chillers meet the varied demands of modern day cooling requirements, incorporating the latest process cooling technology with the most up-to-date refrigeration techniques. The VP chillers are fully selfcontained with all operating and safety controls. There are six models with 6-30kW nominal capacity. Each has a high pressure pump circuit constructed entirely from nonferrous components. The circuit also includes a stainless steel exchanger, enabling efficient cooling of a wide range of liquids, such as water/ glycol, de-mineralized water and oil. Temperature is controlled by a solid state thermostat with digital temperature display (accurate to +I°C). Thus, the VP chiller is versatile, operating at both very low process temperatures and very high ambient temperatures. (Fluids leave the VP chiller at temperatures ranging from +20 to -10°C in ambients up to 43°C.) The units are designed to need a minimum of attention and for customer's own on-site commissioning. They are fully tested before dispatch and each unit carries a full 12 months warranty. F&R Cooling Limited, Wellington, Somerset TA21 8ST, UK.