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Hot water supply heat exchangerRelated Patent Categories: Heat Exchange, Flow Passages For Two Confined FluidsHot water supply heat exchanger description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070119578, Hot water supply heat exchanger. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to hot water supply heat exchangers used for heat pump type hot water supply apparatuses to exchange heat between water and a high-temperature refrigerant. BACKGROUND ART [0002] For example, in a hot water supply heat exchanger used for a heat pump type hot water supply apparatus, a scale component dissolved in water (for example, calcium carbonate) may be deposited and adhered onto the inner wall of a water passage with a rise in water temperature. This means that calcium carbonate is dissolved in running water. As illustrated by the solubility curve in FIG. 9, the degree of solubility of such calcium carbonate in running water decreases with a rise in water temperature. This causes calcium carbonate to be deposited as a scale component. The scale component deposited in the above-mentioned manner is adhered to the inner wall of a water passage. The adhesion of the scale component has been known to be pronounced especially in the following cases: a case in which the temperature of the pipe wall becomes high; a case in which the water speed is low; a case in which the. water flow is disturbed; and other cases. This has restricted use of heat transfer enhancers for enhancing heat transfer from the water side and made it difficult to enhance the performance of hot water supply heat exchangers. [0003] By the way, some hot water supply heat exchangers include a core pipe forming a water passage and a winding pipe placed around the core pipe in a spiral manner and forming a refrigerant passage and heat water flowing through the water passage by a refrigerant flowing through the refrigerant passage. Such hot water supply heat exchangers have already been suggested which can restrain a scale component from being adhered to the inner wall of a part of the core pipe located on the water outlet side and sufficiently secure a water passage even with the scale component adhered thereto to some extent (see Patent Document 1). [0004] Patent Document 1: Japanese Unexamined Patent Publication No. 2003-97898 DISCLOSURE OF INVENTION [0004] Problems that the Invention is to Solve [0005] However, for the hot water supply heat exchanger disclosed in the Patent Document 1, the problem that a scale component is adhered to the water outlet side can be solved but the performance of heat exchangers themselves cannot be enhanced. [0006] The present inventors noticed that the performance of heat exchangers can be enhanced by both restraining adhesion of a scale component and enhancing heat transfer. This led to the present invention. [0007] The present invention is made in view of the above-mentioned points, and its object is to enhance the performance of a part of a heat exchanger located on the inlet side of a water passage and having water of a predetermined temperature or less. Means of Solving the Problems [0008] A first aspect of the present invention is directed toward a hot water supply heat exchanger configured to include a water pipe 1 forming a water passage W and a refrigerant pipe 2 forming a refrigerant passage R and heat water flowing through the water passage W by a refrigerant flowing through the refrigerant passage R. An inlet part A of the water passage W including water of a predetermined temperature or less is provided with a heat transfer enhancer. [0009] With the above-mentioned structure, enhanced is heat transfer from the inlet part A of the water passage W including water of a predetermined temperature or less (in other words, a heat exchanger unit including water having a temperature at which calcium carbonate, i.e., a scale component, is hardly deposited) to the water side. This sharply enhances the performance of the whole heat exchanger. In particular, when the so-constructed hot water supply heat exchanger is used for a heat pump type hot water supply apparatus, the performance of heat transfer from the water side is typically lower than that from the refrigerant side, and the rate of heat transfer from the water side becomes lower in a low-temperature range than that in a high-temperature range due to the influence of physical property values (for example, the rate of heat transfer that decreases with a reduction in temperature or the viscosity coefficient that increases with a reduction in temperature). In view of the above, when the inlet part A of the water passage W including water of a predetermined temperature or less is provided with the heat transfer enhancer, this very significantly enhances the performance of the heat exchanger. [0010] A second aspect of the present invention is directed toward a hot water supply heat exchanger configured to include a water pipe 1 forming a water passage W and a refrigerant pipe 2 forming a refrigerant passage R and heat water flowing through the water passage W by a refrigerant flowing through the refrigerant passage R. A part of the water pipe 1 forming an inlet part A of the water passage W having water of a predetermined temperature or less is provided with a heat transfer enhancement pipe section. [0011] With the above-mentioned structure, enhanced is heat transfer from the inlet part A of the water passage W including water of a predetermined temperature or less (in other words, a heat exchanger unit including water having a temperature at which calcium carbonate, i.e., a scale component, is hardly deposited) to the water side. This sharply enhances the performance of the whole heat exchanger. In particular, when the so-constructed hot water supply heat exchanger is used for a heat pump type hot water supply apparatus, the performance of heat transfer from the water side is typically lower than that from the refrigerant side, and the rate of heat transfer from the water side becomes lower in a low-temperature range than that in a high-temperature range due to the influence of physical property values (for example, the rate of heat transfer that decreases with a reduction in temperature or the viscosity coefficient that increases with a reduction in temperature). In view of the above, when a heat transfer enhancement pipe is used as the water pipe 1 forming an inlet part A of the water passage W having water of a predetermined temperature or less, this very significantly enhances the performance of the heat exchanger. [0012] A third aspect of the present invention is directed toward a hot water supply heat exchanger configured to include a plurality of heat exchanger units H, H, . . . including a water pipe 1 forming a part of a water passage W and a refrigerant pipe 2 forming a part of a refrigerant passage R and heat water flowing through the water passage W by a refrigerant flowing through the refrigerant passage R. The plurality of heat exchanger units H, H, . . . are stacked one above another, the water pipes 1 are connected to one another to form a continuous water passage W, and the refrigerant pipes 2 are connected to one another to form a continuous refrigerant passage R. An inlet part A of the water passage W including water of a predetermined temperature or less is provided with a heat transfer enhancer. [0013] With the above-mentioned structure, enhanced is heat transfer from the inlet part A of the water passage W including water of a predetermined temperature or less (in other words, a heat exchanger unit including water having a temperature at which calcium carbonate, i.e., a scale component, is hardly deposited) to the water side. This sharply enhances the performance of the whole heat exchanger. In particular, when the so-constructed hot water supply heat exchanger is used for a heat pump type hot water supply apparatus, the performance of heat transfer from the water side is typically lower than that from the refrigerant side, and the rate of heat transfer from the water side becomes lower in a low-temperature range than that in a high-temperature range due to the influence of physical property values (for example, the rate of heat transfer that decreases with a reduction in temperature or the viscosity coefficient that increases with a reduction in temperature). In view of the above, when the inlet part A of the water passage W including water of a predetermined temperature or less is provided with a heat transfer enhancer, this very significantly enhances the performance of the heat exchanger. [0014] A fourth aspect of the present invention is directed toward a hot water supply heat exchanger configured to include a plurality of heat exchanger units H, H, . . . each including a water pipe 1 forming a part of a water passage W and a refrigerant pipe 2 forming a refrigerant passage R and heat water flowing through the water passage W by a refrigerant flowing through the refrigerant passage R. The plurality of heat exchanger units H, H, . . . are stacked one above another. The water pipes 1 are connected to one another to form a continuous water passage W, and the refrigerant pipes 2 are connected to one another to form a continuous refrigerant passage R. A heat transfer enhancement pipe is used as the water pipe 1 corresponding to an inlet part A of the water passage W. [0015] With the above-mentioned structure, enhanced is heat transfer from the inlet part A of the water passage W including water of a predetermined temperature or less (in other words, a heat exchanger unit including water having a temperature at which calcium carbonate, i.e., a scale component, is hardly deposited) to the water side. This sharply enhances the performance of the whole heat exchanger. In particular, when the so-constructed hot water supply heat exchanger is used for a heat pump type hot water supply apparatus, the performance of heat transfer from the water side is typically lower than that from the refrigerant side, and the rate of heat transfer from the water side becomes lower in a low-temperature range than that in a high-temperature range due to the influence of physical property values (for example, the rate of heat transfer that decreases with a reduction in temperature or the viscosity coefficient that increases with a reduction in temperature). In view of the above, when a heat transfer enhancement pipe is used for the heat exchanger unit H corresponding to the inlet part A of the water passage W including water of a predetermined temperature or less, this very significantly enhances the performance of the heat exchanger. In addition, since a heat transfer enhancement pipe is used for the heat exchanger unit H partly forming an inlet part of the water passage W and including water of a predetermined temperature or less, this facilitates configuring the heat exchanger unit H and connecting the heat exchanger unit H with another heat exchanger unit. [0016] According to a fifth aspect of the present invention, in the first or third aspect of the present invention, spiral grooves 7, 7, . . . formed in the inner surface of the water pipe 1 can be adopted as the heat transfer enhancer. The above-described structure can enhance the heat exchange performance of the heat exchanger while suppressing problems caused by deposition of a scale component and reduce the increase in pressure loss on the water side and the cost increase to a larger extent than other heat transfer enhancement pipes. [0017] According to a sixth aspect of the present invention, in the second or fourth aspect of the present invention, an internally-grooved pipe provided at its inner surface with spiral grooves 7, 7, . . . can be adopted as the heat transfer enhancement pipe. The above-described structure can enhance the heat exchange performance of the heat exchanger while suppressing problems caused by deposition of a scale component and reduce the increase in pressure loss on the water side and the cost increase to a larger extent than other heat transfer enhancement pipes. [0018] According to a seventh aspect of the present invention, in the first, second, third, fourth, fifth, or sixth aspect of the present invention, the refrigerant pipe 2 can be connected to the periphery of the water pipe 1. The above-mentioned structure can enhance the rate of heat transfer from the refrigerant pipe 2 to the water pipe 1, resulting in a more significantly enhanced heat exchange performance. EFFECTS OF THE INVENTION [0019] A first aspect of the present invention is directed toward a hot water supply heat exchanger configured to include a water pipe 1 forming a water passage W and a refrigerant pipe 2 forming a refrigerant passage R and heat water flowing through the water passage W by a refrigerant flowing through the refrigerant passage R. An inlet part A of the water passage W including water of a predetermined temperature or less is provided with a heat transfer enhancer. With the above-mentioned structure, enhanced is heat transfer from the inlet part A of the water passage W including water of a predetermined temperature or less (in other words, a heat exchanger unit including water having a temperature at which calcium carbonate, i.e., a scale component, is hardly deposited) to the water side. This sharply enhances the performance of the whole heat exchanger. In particular, when the so-constructed hot water supply heat exchanger is used for a heat pump type hot water supply apparatus, the performance of heat transfer from the water side is typically lower than that from the refrigerant side, and the rate of heat transfer from the water side becomes lower in a low-temperature range than that in a high-temperature range due to the influence of physical property values (for example, the rate of heat transfer that decreases with a reduction in temperature or the viscosity coefficient that increases with a reduction in temperature). In view of the above, when the inlet part A of the water passage W including water of a predetermined temperature or less is provided with the heat transfer enhancer, this very significantly enhances the performance of the heat exchanger. Continue reading about Hot water supply heat exchanger... Full patent description for Hot water supply heat exchanger Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Hot water supply heat exchanger patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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