New air heater creates perfect working conditions in winterMunich, 11-Oct-2010
The new HP 252 heater from Wacker Neuson enables plastering and screed work to be carried out at sub-zero temperatures.
Wacker Neuson is set to launch its new HP 252 heater in October. However, a pre-series production model already more than proved its worth during the winter of 2009/2010, when construction specialists Baresel, based in Frankfurt am Main, used the machine to complete plastering and screed work in sub-zero temperatures. The company was under heavy pressure to get the job done on time, and did, thanks to the HP 252. It also proved considerably more efficient than other heating options.
Optimum heating efficiency
“We were really impressed with the HP 252, despite initial reservations as to whether it could help us complete the project,” explains Günter Fries, foreman at construction company Baresel. In December 2009, Baresel was contracted to carry out plaster and screed work in an eight-story building in Frankfurt am Main. With outside temperatures as low as minus 8°C, the building, which was not yet insulated, had to be heated to at least 7°C for the work to be completed. The company contacted Wacker Neuson’s sales and service station in Frankfurt to find out what options were available. “Baresel was not allowed to run heating equipment that emitted exhaust fumes in the individual stories - that was the problem,” recalls Manto Volkmann from Wacker Neuson’s Frankfurt sales and service station. “So we were left with three options. The first two involved electric heaters or oil heaters situated outside the building. These would have been very costly, though. The third alternative led straight to the new HP 252 – and this also turned out to be the most efficient solution.”
Clean, dry, warm air
The HP 252 air heater uses its innovative hydronic heating system to produce clean, dry, warm air. A similar system is also used in Wacker Neuson’s successful hydronic surface heaters. The HP 252’s diesel-powered heater warms a mixture of water and glycol to around 82°C. The liquid is then pumped through hoses to heat exchangers over a distance of up to 120 meters (with auxiliary pumps) or a height of up to 18 meters. In the heat exchangers, the hot liquid warms air drawn in by a fan, which is then used to heat an entire room. The cooled liquid is pumped back to the heater and reheated. The heat exchangers are placed in the room to be heated and set to the correct temperature. Three heat exchanger models are available: HX 15, HX 30 and HX 60, generating 14.6 kW, 29.3 kW and 58.6 kW of heat respectively. The HP 252 consumes around 50 percent less fuel than conventional heating methods thanks to its hydronic design. With a thermal output of 252 kW, the heater runs at an efficiency rate of around 83 percent. It is a very safe device since there is no naked flame, which means the resulting warm air does not contain any combustion-induced moisture or harmful emissions.
50 percent cost savings
For Baresel’s project in Frankfurt, the hoses were connected to four HX 60 heat exchangers and placed in stories three to six. Each story had a surface area of around 300 m2. Room temperature was initially around zero degrees Celsius. After two hours, it had risen to 7°C. After six hours it had topped 17°C. The company was able to start plastering and screeding after just one hour. “We compared the costs with those from other projects where we used conventional heaters, and realized that the HP 252 cuts costs by around 50 percent,” states Fries. “We will definitely use it again.” Günter Fries was also very happy with Wacker Neuson’s service. “I got the impression that the words ‘impossible’ and ‘no can do’ just aren’t part of the Wacker Neuson vocabulary.”
About Wacker Neuson:
Wacker Neuson SE is a global manufacturer of light and compact equipment. With over 30 affiliates and more than 180 sales and service stations across the globe, the company offers an exceptionally broad product portfolio. Manufacturing activities are distributed across three German, one Austrian, two American and one Philippine production sites. Almost all products manufactured by the company are branded Wacker Neuson. The only exceptions to this in Europe are Kramer Allrad products and Weidemann-branded agricultural machinery. With over 300 product categories and complementary rental, spare parts and repair services, Wacker Neuson is the partner of choice among professional users in construction, gardening, landscaping and agriculture, as well as among municipal bodies and companies in the industrial and recycling sectors.
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