Method of generating hot air

FIELD: combined cooling and refrigeration systems.

SUBSTANCE: method comprises expanding air in the turbine up to a low temperature, heating air in the first heat exchanger with utilized heat, compressing air to the initial pressure in the compressor, withdrawing heat in the second feeding heat exchanger, and supplying compressed dry air to the receiver where the air is heated.

EFFECT: enhanced efficiency.

4 dwg

 

The invention relates to the field of gas and can be used to generate a source of heating temperature, in particular, plus 100° C-150° from energy utilization threads when their temperature plus 20° C - + 60° C.

Known methods for producing hot air for heat pumps based on reversed Brayton cycle (cycle Lorentz), which includes the process of compression, heat, expansion, heat input from an external source.

The main drawback of the simple inverted Brayton cycle (cycle Lorentz) is that when the temperature reaches below zero for the turbine and the heat exchanger of the heat input comes icing by refrigerant (air), and from the recycling stream. To avoid reducing the temperature below zero it is necessary to limit the compression ratio in the compressor and(or) the number of removed heat in the supply heat exchanger. Reducing the rate of pressure rise in the main heat exchanger will reduce the heating temperature (Bulgarian AV, Mukhachev GA, Shchukin VK Thermodynamics and heat transfer. M., “Higher school”, 1973. The technique of mechanical engineering, 2002, No. 3 (37), Pastelist. The doctrine of the warmth and heat pumps. The technique of mechanical engineering, 2002, No. 3 (37), S. 122-132).

The known method and device, also implement the cycle Lorenz, described in the patent of the Russian Federation No. 2136929, F 24 F 3/14 F 02 6/00, 1999. The device is implemented in the way: the air expands in the turbine to a temperature of 0° To carry out heat exchange and is compressed in the compressor, served with a temperature of about 45° With the external environment.

The use of this plant for producing hot air at a temperature of about 100-150° With, for example, for heating or high temperature heating, it is impossible. At high boost pressure (for high temperature for the compressor) temperature for the turbine will be substantially less than zero. The latter, as in the analog (RF patent № 2136929), - scientific problem, which hinders efficient use (from the point of view of thermodynamics) air heat pumps, generated on the basis of turbomachines.

The closest analogue of the claimed method is a method for hot air, including the expansion of the air in the turbine of pererasseyaniya to low temperatures, heat in the first heat exchanger utilizing heat, compressed to the initial pressure in the booster compressor, the heat in the second nutrient exchanger and compressed dry air in the receiver (see A.S. USSR 1262217, CL F 25 11/00, 1986).

The invention aims at creating a more efficient way to produce hot air, where the temperature rise over the compressor is not associated directly with what rucenim temperature for the turbine below zero.

The problem is solved in that in a method of producing hot air, including the expansion air turbine of pererasseyaniya to low temperatures, heat in the first heat exchanger utilizing heat, compressed to the initial pressure in the booster compressor, the heat in the second nutrient exchanger and compressed dry air in the receiver according to the invention, in the receiver, the air is heated.

Refer to figure 1, which shows the gas heater 1, which can operate, for example, by an electric motor 2. The unit includes an air turbine of pererasseyaniya 3, the utilization heat exchanger 4 (first heat exchanger), booster compressor 5, a heater 6, for example, chemical product (the second nutrient exchanger) and the receiver 7.

The method is as follows.

In the receiver 7, the air is heated by electrical heating elements (not shown). The dry air from the receiver 7 is supplied to the turbine pererasseyaniya 3 (temperature at turbine, typically 0° C), is heated in the heat-recovery heat exchanger 4 and is compressed to the initial pressure in the receiver 7 in the booster compressor 5. The heat in the heat exchanger 6 is from the condition of constant temperature in the receiver 7.

For the feasibility analysis will refer to the graphs in figure 2-4. Here (figure 2 and 3) along the axis absz the SS pending the temperature of the heating body (external temperature), on the y - axis the temperature outside the compressor (figure 2) and the value of thermal coefficient (figure 3):

μt=Cp·(T- -Tonline)/E0,

where T- - temperature source to a high temperature (for compressor), Tonlinethe source temperature of the low temperature of the external coolant, E0- input power.

For such machines (temperature not below zero degrees for turbine) achieving fuel ratio for the compressor 100 to 150° is a good indicator.

Classic heat pumps that use freon, refrigerant, ammonia and other, it is possible to obtain a high fuel ratio (>μt>2,5) when the difference between cold and hot source less than 40° C. the Dependence of efficiency(μtin existing heat pumps from the temperature difference at the inlet and outlet of the compressor shown in figure 4. (PageList, the doctrine of the warmth and heat pumps, Machinery engineering, 2002, No. 3 (37), s-123).

The method of obtaining hot air, including the expansion air turbine of pererasseyaniya to low temperatures, heat in the first heat exchanger utilizing heat, compressed to the initial pressure in the booster compressor, the heat in the second nutrient exchanger and compressed dry air in d is the Iberia, characterized in that in the receiver the air is heated.



 

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