FI74801C - Procedure for collecting the freezing heat of the water. - Google Patents

Description

74801

Method for recovering the heat of freezing of water by means of a heat pump - Förfarande för tillvaratagande av vattnets tillfrysningsvärme

The invention relates to a method for recovering the heat of freezing of water with a heat pump.

The use of water as a heat source in heat pump machinery is known, for example, from EP patent application 0 088 468 (F 25 B 29/00) and from NO publication 152 269 (F 25 B 29/00).

GB 1 314 895 (F 25 C 1/12) discloses an ice machine for freezing liquid products, the main principle of which, i.e. that heat is transferred from the freezing liquid to the colder heat transfer surface through a loop-shaped moving belt, is the same as the methods of the invention operating heat pump evaporators. The application of this main principle to the heat pump evaporator is presented in Finnish patent application 85 0931.

The invention according to the present application does not relate to the above-mentioned main principle, but to methods used in connection with this main principle, which are thermotechnically and functionally suitable for use in connection with heat pumps. For example, a solution to the problems associated with crushing ice is presented when freezing heat is recovered from the water used as a heat source. To achieve this, the methods according to the invention are characterized by what is set forth in the characterizing part of claim 1. Other features of the invention will be apparent from the dependent claims.

In the following, the invention will be explained with reference to the accompanying Figures 1-5. The names in the pictures and text are: 1 water 2 ice 2 74801 3 water + ice 4 oil 5 rubber 6 end roller (roller) 7 side roller (roller) 8 sliding plate 9 rubber profile (seal, rim) 10 spacer plate / plate 11 evaporator plate 12 spreader 13 refrigerant liquid 14 refrigerant vapor 15 side plate 16 scraper 17 nozzle / atomizer 18 wall 19 pump 20 oil tank 21 riser valve 22 wind generator 23 porous material 24 electric resistor 25 controller

In the methods of the invention for utilizing the heat of freezing water with a heat pump, water (1) is applied as a film to one surface of a plate (8) made of a highly thermally conductive material, the plate is moved relative to the heat pump circuit evaporator (11). of view. To crush and remove ice from the surface of the plate (8), the ice layer is bent between the rotating, cylindrical roll (7) and the plate (8) as the plate (8) bends. A lubricant can be used between the plate (8) and the evaporator (11) to reduce wear and enhance heat transfer. The plate (8) can be led as an endless loop into contact with the evaporator (11) inside the loop, whereby water (1) is applied to the outer surface of the plate loop (8). The spreading of water as a film on the surface of the plate (8) can be effected by a spreader (12) which acts as a plate parallel to the movable heat transfer plate (8) and in its immediate vicinity relative to the evaporator (11). The spreading of water as a film on the surface of the plate (8) can be achieved by spraying water on the plate in drops using a nozzle / sprayer (17).

The main principle of the invention is the same as in the method according to patent application No. 85 0931, i.e. the heat-conducting plate (8) contacts (possibly lubricates in between) the cold heat transfer surface of the evaporator (11) and slides against it, freezing water on one side of the plate bending.

In order to enhance the crushing and detachment of ice, a side roll (7) is used in the method according to the invention, at which the sliding plate (8) bends in a different direction than at the end roll (6). Between the side roll and the end roll, the ice layer is forced to bend so much that it is crushed into small pieces which come off the plate at the latest at the scraper (16). Scrapers are not essential in principle. Crushed ice mixed with water can be returned to a heat source (water body). In some cases, the formation of an ice pile on the ground may also be allowed. When you place the evaporator in a higher place, the wind helps the ice to spread over a larger area.

In Figures 1, 2, and 3, the evaporator is constructed by making grooves in metal plates (e.g., aluminum or copper) (11) (in which refrigerant flows and evaporates) and gluing the plates together or to the plate (10). The evaporator plate (11) can be straight (flat) or curved (convex). In the evaporator plate (11) of Fig. 2, the number of grooves increases in the direction of increasing steam concentration 4 74801 (to increase the flow cross-sectional area and to reduce the pressure drop).

, In Figures 4 and 5, the refrigerant flows in the gap between the plates (11), whereby the evaporator has a very simple structure. To reduce the pressure drop, the gap thickness can be increased in the direction of increasing vapor concentration (Figure 5).

In Figures 1, 2 and 4, water (1) is applied to the sliding plate (8) by spreaders (12) which are plates (e.g. metal or rubber) which drag the sliding plate or are fixed at a certain distance from the sliding plate. Water can also be applied to the sliding plate in small droplets (with nozzles (17)) as shown in Fig. 3 or using a porous material (23) as shown in Fig. 5.

In Figures 1, 2 and 3, the sliding plate (8) and the side plates (15) delimit an enclosed space (a seal (9) may be used), which may contain oil or Vaseline. The transport of lubricant between the sliding surfaces is aided by the guides (25) in the oblique position and the grooves in the end roller (6) pulling the sliding plate (8). In Fig. 3, the oil flows into the oil tank (20), from where it is pumped to a suitable place (on the plate (8)) and the risk of leakage in the seal (9) is then low.

The sliding surfaces can also be curved in Figures 2 and 3. If this is not the case, sufficient contact between the plates (11) and (8) can be ensured by arranging a slight vacuum (by sucking air out) into the space limited by the plates (8) and (15).

The invention can be used for storing wind energy according to Figure 4 by melting ice (e.g. with an electric heater (24) or transferring shaft power directly to the friction loss of water (1) by propeller, agitator, etc.) during strongest winds, where the wind turbine does not have to be large.

Claims (5)

74801 A method of utilizing the freezing heat of water by a heat pump, comprising applying water as a film to one surface of a plate (8) made of a highly thermally conductive material, moving the plate relative to the heat pump circuit evaporator (11), contacting the plate with an evaporator characterized in that in order to crush and remove ice from the surface of the plate (8), the ice layer is bent between the rotating, cylindrical roll (7) and the plate (8), the plate (8) bending. Method according to Claim 1, characterized in that a lubricant is used between the plate (8) and the evaporator (11) in order to reduce wear and enhance heat transfer. Method according to Claim 1 or 2, characterized in that the plate (8) is brought into contact with the evaporator (11) inside the loop as an endless loop and that water (1) is applied to the outer surface of the plate (8). Method according to Claim 1, 2 or 3, characterized in that the spreading of water as a film on the surface of the plate (8) is effected by a spreader (12) which is stationary relative to the evaporator (11), parallel to the movable heat transfer plate (8) and in its immediate vicinity. plate. Method according to Claim 1, 2 or 3, characterized in that the spreading of water as a film on the surface of the plate (8) is effected by spraying water onto the plate in droplets using a nozzle / atomizer (17).