JPS6078244A - Heating medium circulating type hot water supplying device - Google Patents

Abstract

PURPOSE:To enable to store the water having a temperature, which realizes hot water supply for a short time, in the upper portion of a hot water supply tank and consequently to cope with a suddenly developed hot water supply load by a structure wherein a heating heat exchanger, through which heat transfer medium circulates, is provided in the upper portion of the hot water supply tank and at the same time a circulating circuit if stored hot water to communicate the upper part of a tank wall with its lower part is provided. CONSTITUTION:When hot water storage operation is performed, because of a condenser 2 being arranged in the upper portion of a hot water supply tank 1, only the stored hot water in the upper portion is heated. Accordingly, under the condition that the circulating of stored hot water 11 by a circulating pump 13 is stopped, the temperature of the stored hot water in the upper portion of the hot water supply tank is so quickly raised that the certain fixed amount of hot water can be held. Consequently, the state to enable to cope with the unexpected hot water supply load is established. In order to heat the whole amount of stored hot water, the circulating pump 13 is put into operation so as to lower the water to be heated by circulating from the upper portion to the lower portion in the hot water supply tank.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a so-called heat medium circulation water heater that stores hot water using outside air as a heat source using a heat pump device or the like that utilizes heat medium circulation, and particularly relates to an improvement in a hot water storage structure. It is something.

[Prior art]

Figure 1 is an explanatory diagram of a conventional heat pump water heater disclosed in, for example, Japanese Utility Model Application Publication No. 58-62066. In Figure 1, (1) is a compressor, and (2) is the discharge side of the compressor (1). A condenser (3) connected to the
1 is an expansion valve provided on the outlet side of this condenser (2), (
41 is the expansion valve + evaporator connected to 31, (5) is the blower, (6) is the evaporator (accumulator installed between 41 and compressor (1), and (7) is the hot water tank. It is kept warm by a heat insulating material (8). (9) is a water supply pipe, (II is a hot water supply pipe).

In the heat pump water heater configured in this way,
When the hot water storage operation is performed, the high temperature refrigerant passes through the condenser (2) in the lower part of the hot water supply tank (7) and heats the stored hot water α11 in the tank by natural convection. Therefore, since the tank is heated from the bottom, there is almost no difference in the temperature inside the tank between the top and bottom, and the tank can be heated evenly.

Conventional heat pump water heaters heat the entire amount of hot water (I11) stored in the tank from the bottom of the tank (7), which takes a long time to raise the temperature to boiling point. Despite having sufficient heat capacity, the hot water storage temperature is low.

The disadvantage was that it could not be used.

[Summary of the invention]

The present invention has been made to overcome the drawbacks of the conventional devices as described above, even for short-term operation.

Objectives C and T are to provide a heat medium circulation water heater that stores water at a temperature that can be used for hot water supply in the upper part of the tank and can handle sudden hot water supply loads.

[Embodiments of the invention]

An embodiment of this invention will be described below. FIG. 2 is an explanatory diagram of the heat pump water heater of the present invention, and the reference numeral (11) is
~(II) is the same or equivalent part of the conventional device shown in FIG. 1. However, the condenser (3) (2) is disposed above the hot water tank (7). Also.

It has a circulation path for stored hot water that passes through the hot water tank (7) and communicates with the upper and lower parts. -r That is, a circulation pump 0 is provided between the hot water pipe aa at the top of the hot water tank (7) and the water supply pipe (9), and the hot water from the hot water tank is circulated to the bottom according to the necessity of hot water supply operation. .

Furthermore, a sensor (141, as) for detecting boiling water during hot water storage operation is installed on the outer wall of the hot water tank (7). The sensor αS boils the top of the hot water tank only when there is no large hot water supply load, such as when hot water is being supplied to a bath, and is used to detect sudden or small hot water supply loads.In addition, the sensor Based on preset boiling conditions for large hot water loads.

This sensor heats the water to the bottom of the tank. In addition,
aa is a control device that controls this system.

Next, the operation according to the embodiment of the present invention will be explained with reference to FIG.

In the heat pump water heater (4) configured as described above, when hot water storage operation is performed, since the condenser (2) is not disposed above the hot water tank, the hot water stored above the condenser (2) You will only have to heat it. Therefore, when the circulation of the stored hot water a9 by the circulation pump 0 is stopped, the temperature of the stored hot water in the upper part of the hot water tank is rapidly raised, and a certain amount of hot water is held. For this reason, it is always possible to respond to suddenly occurring hot water supply loads. During times when you are not taking a bath, such as during the day, heat the water up to the position of the upper sensor Q41.

When the scheduled time for bathing approaches, boil the entire amount of water stored at the bottom of the hot water tank. In this case, the circulation pump is operated to circulate and lower the heated water from the upper part to the lower part in the hot water tank.

Note that the above explanation refers to hot water storage operation using a heat pump device.
Although shown as an example, the heating medium for heating the hot water tank may be a heating medium other than a heat pump, for example, a heating medium collected by a solar heat collector, which circulates and stores hot water.

Further, although the evaporator (4) is described as being based on an air heat source, it may be a water heat source or a direct expansion type evaporator consisting of a solar heat collector.

〔Effect of the invention〕

As described above, according to the present invention, since the heating heat exchanger is disposed at the top of the hot water tank, high-temperature water is stored at the top of the hot water tank immediately after the start of the heat medium circulation operation. It can handle the hot water supply load.

In addition, after the hot water reaches the upper sensor position, the storage operation is stopped, and a separate controller is installed to start operation at busy times when hot water needs to be supplied to a large hot water supply, such as when dispensing hot water to a bath. Since the lower part of the tank is at a low temperature, heat loss from the core to the outside of the tank can be prevented.

In addition, even in hot water storage operation after the upper part of the tank is heated, the water level that has been raised by circulating the hot water in the tank and heating and storing it will drop from the upper part, so for example, if the scheduled bathing time is earlier. After a certain amount of hot water storage operation, it is possible to cope with the hot water supply load.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional heat pump water heater, and FIG. 2 is an explanatory diagram showing a heat pump water heater according to an embodiment of the present invention. In the figure, 0) is the compressor, (2) is the condenser, (31 is the expansion valve, +4) is the evaporator, (7) is the tank, (9) is the water supply pipe, α
O is a hot water pipe, 01) is a hot water supply pipe, 03 is a hot water pipe, and αj is a circulation pump. Note that the same reference numerals in the two figures indicate the same or equivalent parts. Agent Masuo Oiwa (7) Figure 1

Claims (2)

[Claims] (1) A heating heat exchanger in which a heat medium circulates is installed in the upper part of a hot water tank configured to supply water from the bottom of the tank and hot water from the top, and a hot water storage that penetrates and communicates with the tank wall and the lower part. A heat medium circulation water heater characterized by being equipped with a water circulation circuit. (2) A heating heat exchanger in which a heat medium circulates is provided at the top of a hot water tank configured to supply water from the bottom of the tank and hot water from the top, and a hot water storage that penetrates and communicates with the top and bottom of the tank wall. Equipped with a water circulation circuit and a large hot water tank.
Equipped with multiple boiling detection sensors at the bottom and top of each hot water tank that detect the amount of boiling water corresponding to a small hot water supply load,
When operating in preparation for small-load hot water supply, the stored hot water circulation system is stopped. A heat medium circulation type hot water supply device characterized in that a circulation pump is operated during operation in preparation for large-load hot water supply.