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Contenu archivé le 2022-12-27

HEAT PUMP DRIVEN BY A DIESEL ENGINE

Objectif

To demonstrate a compact diesel engine driven heat pump with screw compressor for heating and hot water production.
Design, production and monitoring were carried out according to plan.
In bivalent parallel operation the heat pump's average primary energy ratio was 1.35 and met project forecasts. With it an energy saving of +- 28,000 l was achieved relative to a boiler heating system. During the heating period, heat delivered 40 Mwh thermal output. Because of this low heat demand the plant is not economic. However, feasible capital payback periods of 5-10 years can be achieved if annual heat output is increased to 800-1200 Mwh, eg. for alternative heating of a swimming pool or use in large agricultural operations. A plant with up to three times that of the demonstration can be housed in the container. As a result the heat pump system has significant application potential in the building sector for heating and hot water production.
At the outset of the project coordination of the heat pump with the overall heating system was somewhat problematic, mainly because temperature specifications for theraw water were too high. Consequently the heating station triggered additional heat too often. Once heat regulation was under control the system operated satisfactorily.
Using the pressure drop in the outside air in the evaporator proved inadequate in determining the need for thawing. However, monitoring the differential between outside air temperature and evaporating temperature was useful when done in conjunction with a fixed thawing period of 10 minutes, for each half of the evaporator. The excellent result was a low energy expenditure of 0.9% of total thermal output of the heat pump.
The spring/damping elements and use of the simulated vibration programme to support the plant worked very well.
The airborne and solid-borne noise valves for the heat pump plant are all within regulation limits. No signs of wear were found on the engine after
a 3,900 h. running period, and comparisons of computer generated values and actual data showed little variation. The long-term operation ofthe fully automatic regulating system has been proved reliable and energy efficient. Output regulation is controlled by a sliding scale of forward temperature, maximizing energy savings.
Installation of the heat pump, together with all the associated measurement, control and monitoring equipment in a track container met the requirement for the most compact design possible. The evaporator is installed on the container roof; it consists of 2 half units, one of which can be defrosted if necessary while the other continues to operate normally. The heat pump occupies two-thirds of the length of the container, the remainder serves as the measurement room. The container is mounted on a M.A.N. Works building in Munich. Basically, the heat pump serves to produce hot sanitary water, and additionally in winter to provide space heating. At the design point it gives a heat output of 190 KW. Changing the R.P.M. Over a range from 1 200-2 500 min adjusts the output to demand. To eliminate vibration problems, the mounting was designed on the basis of a mathematical model of a multi-body system. The measured values of air-borne and structure-borne noise are well below the DIN values. After functional tests of several months' duration, since 1982 control and operation of the installation has been fully automatic.

Appel à propositions

Data not available

Régime de financement

DEM - Demonstration contracts

Coordinateur

MAN TECHNOLOGIE GMBH
Contribution de l’UE
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Adresse
DACHAUER STRASSE 667 POSTFACH 50 04 26
8000 MÜNCHEN
Allemagne

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