JPH0443186B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water supply system in an apartment complex or the like.

Conventional Technology Traditionally, hot water supply systems in apartment buildings have been of the collective type or the individual type. A collective hot water system supplies hot water to the entire residential building using a single heat source. It always supplied hot water at a constant temperature to avoid running out of hot water.

Problems to be Solved by the Invention In conventional systems such as those mentioned above, firstly, collective fuel supply systems always require a large heat source in order to supply a constant hot water temperature and unconditionally meet the demands of residents. I had no choice but to use the machine. In addition, in order to constantly circulate high-temperature hot water,
It was not an energy-saving system as there was a lot of heat loss.

The present invention aims to solve these problems and provide a hot water supply system for housing complexes that is energy-saving, space-saving, and does not run out of hot water.

Means for solving the problem To achieve this objective, each dwelling unit has a small hot water tank, and the heating source for the hot water tank is only one, and the heating source is measured by a flow meter connected to the hot water tank. A hot water storage tank whose flow rate per unit time continuously exceeds the set flow rate for a set time or longer is heated preferentially.

Effect: By this method, it is possible to provide a hot water supply system for apartment buildings that is energy efficient, space saving, and does not run out of hot water.

Embodiments Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram when a heat pump water heater is used as a heat source device. A refrigeration cycle is composed of a heat source device 1 consisting of a compressor and an expansion valve, an evaporator 2 as an air heat source, a plurality of condensers 3, and a refrigerant flow rate control valve 6 with refrigerant piping. The evaporator 2 at this time may be water-cooled. Water in the hot water tank 4 is sucked up from the bottom of the hot water tank by a circulation pump 5 and sent to the condenser 3. The heat-exchanged water is returned to the hot water tank 4 again. To hot water tank 4,
Water is supplied through a water supply pipe 10 and hot water is supplied through a hot water supply pipe 9. A flow meter 7 is installed in the middle of the water supply pipe 10. The flow meter may be placed anywhere along the hot water supply route. Flow rate data measured by the flow meter 7 is sent to the controller 8. The controller 8 calculates the flow rate per unit time, and as a result, the flow rate control valve 6 controls the heating amount of each condenser.

The effect will be explained below. This system uses a single heat source unit to supply hot water to multiple residences, and by taking advantage of the simultaneous usage rate of hot water, it has a large heating capacity per residence, while using a small heat source capacity as a whole. It is possible to respond. This means that although the capacity of the heat exchanger 3 is large in FIG. 1, the capacity of the heat source device 1 can be made smaller than the sum of the capacities of all the heat exchangers. At this time, by having a hot water storage tank in each house, the simultaneous usage rate can be further reduced.Conversely, considering the start-up characteristics of the refrigeration cycle, it is difficult to instantaneously heat the water with a heat pump, A hot water tank is required. In order to reduce the capacity of this hot water storage, looking at the characteristics of the hot water supply load in a house, the largest load is filling the bathtub with water, and a large amount of hot water is continuously supplied at this time.

If you try to cover this with just hot water from the hot water tank,
For example, a large bathtub requires a capacity equivalent to 200℃ at 50℃. In order to further reduce the required capacity of the hot water storage tank, the hot water storage tank may be heated at the same time as filling with water. This is called water filling and simultaneous heating. In order to certify that we are currently under water supply, we look at the amount of hot water used per day by purpose.
By far, the biggest factor is hot water supply when the water is filled, and it is also the largest in terms of the amount used per unit time and the continuous length of time it is used.

You can use this information to understand the purpose of hot water supply. If you want to fill 200 in 20 minutes, it will cost 10/
Requires a flow rate of minutes. Taking advantage of the fact that this continues for 20 minutes, when 7/min or more is used continuously for 2 minutes or more, it is recognized as water filling time and water filling and simultaneous heating is started. When the flow meter 7 in Fig. 1 measures the usage amount of 7/min or more for 2 minutes, adjust all flow control valves and adjust the amount of refrigerant circulating to the condenser 3 so that the amount of heat exchange is maximized. Make it. The water supplied from the water supply pipe 10 at the same time as the hot water supply from the hot water supply pipe 9 is mixed with the surrounding hot water at the bottom of the hot water storage tank, and is sent to the condenser 3 by the circulation pump 5.
Heat is exchanged with and heated up to 50℃. Hot water tank 4 again
The water is returned to the hot water supply pipe 9 and used for filling water. For example, if heat exchanger 3 has an auxiliary heating capacity of 10000Kcal/h, water will be heated 4.2/min from 10℃ to 50℃.
It should be possible to raise the temperature by 40 degrees, and if you want to fill the tank with water in 20 minutes, as shown in Figure 2, the amount of water supplied by simultaneous heating of water and water will be 84 in the shaded area in 4.2 x 20 minutes.
The capacity of the hot water storage tank was 200, but at 50℃ it is 120.
If converted to 60℃, it can be reduced to 96 degrees.

In order to supply heat using a heat source with as small a capacity as possible, it is necessary to distribute the heating capacity appropriately to avoid running out of hot water in residential units that require heating quickly. If it is not necessary to heat the water and water at the same time, the other dwelling units can be heated when there is sufficient heat source capacity.

In addition, since each house has a hot water storage tank, heating only when necessary will be sufficient to meet refueling requests.
This saves energy compared to the conventional collective type, which continuously circulates high-temperature water.

FIG. 3 shows an example to which this control is applied. The grid in the diagram represents the water supply to the bathtubs in each dwelling unit. Even if the amount of hot water used by each dwelling unit overlaps, the only time it is necessary to quickly heat the bathtub is when filling the bathtub with water, so under the normal concept of simultaneous usage rate, this control is required even during times when the usage rate should be 60%. If used, it is possible to reduce the amount by up to 40%. In other words, the heat source capacity can be reduced accordingly.

Effects of the Invention As described above, the water heater of the present invention can reduce not only the hot water storage tank but also the heat source capacity in a hot water supply system for multiple dwelling units, and can realize energy and space-saving hot water supply without running out of hot water. Its practical effects are significant.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of a water heater according to an embodiment of the present invention, Fig. 2 is a diagram showing the proportion of hot water supplied by simultaneous heating of water when filling a bathtub with water, and Fig. 3
The figure is a diagram showing changes in the concurrent usage rate in the system. 1... heat source machine, 2... evaporator, 3... condenser,
4... Hot water tank, 6... Valve, 7... Flow meter, 8...
controller.

Claims (1)

[Claims] 1. Equipped with a plurality of hot water storage tanks arranged in each of a plurality of dwelling units, one heat pump heating source for the plurality of hot water storage tanks, a condenser, a refrigerant flow control valve, and a hot water supply flow meter each connected to the hot water storage tank. death,
When there is a hot water storage tank in which the hot water supply flow rate per unit time measured by the flow meter continuously exceeds the set hot water supply flow rate for a set time or more, the amount of heating in each of the condensers is adjusted by adjusting each of the refrigerant flow rate control valves. control,
A water heater characterized by controlling the heat pump heating of the hot water storage tank preferentially.