JPS59107198A - Total heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the growth of bacteria for thereby performing a hygienically safe ventilation, while maintaining a latent heat exchanging efficiency, by causing a heavy metal or a substance containing a heavy metal to deposit on a diaphragm surface. CONSTITUTION:A substance 8 containing a heavy metal plus a traditional hygroscopic material is deposited on a diaphragm 4. The heavy metal includes, for example, Ag, Cu, Zn, Cd and Hg etc., which are present independently, or as a chloride, as a metallic salt such as a nitrate or a metallic oxide. As for instance, a diaphragm made of a bleached kraft paper with a LiCl added as a hygroscopic material is sprayed with a bacteria and tested. It was experienced that the bacteria growth rate was accelerated where no heavy metal was added, and some bacterias died where AgCl and CuCl were added in the 1wt% of diaphragm weight.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improved energy-saving heat exchanger that recovers sensible heat and latent heat while providing ventilation.

Conventional configurations and their problems Total heat exchangers that recover sensible heat and latent heat are broadly classified into stationary transmission type and heat storage rotating type. Among these, the static transmission type generally has the structure shown in FIG. In other words, multiple layers of partition plates with heat conductivity and moisture permeability are stacked at predetermined intervals,
- The secondary airflow and the secondary airflow are formed to pass alternately between these layers, and sensible heat and latent heat are transferred between the airflows through the partition plate. Conventionally, as shown in FIG. 2, as shown in FIG. 2, conventionally, a hygroscopic substance 5 such as Lieβ is added to a base material 4 such as paper having pores 3 in many cases. Moisture permeation phenomenon includes two processes: ■ After moisture is adsorbed on the surface of the base material, it moves through the base material with a concentration gradient and is desorbed on the surface of the base material on the other side of the flow, and ■ It passes directly through the pores as water vapor. The former is influenced by the ability of the hygroscopic substance, and the latter by factors such as the porosity and pore size of the substrate. For that reason,
In order to increase the latent heat exchange efficiency, it is necessary to increase the porosity to the extent that air leakage does not become too large and to improve the permeability of the base material. The pressure difference between air flows on both sides of the partition plate is usually very small compared to the pressure difference between water vapor, and even if the porosity is increased, air leakage is relatively small.

By the way, if bacteria are included in the airflow, they may adhere to the surface of the partition plate and multiply, and may migrate to the other side of the flow through the pores, causing problems in hospitals and the like. As a preventive measure, there is a method of treating the surface of the partition plate with synthetic resin to close the pores, but this greatly reduces the amount of moisture that can pass through directly as water vapor, significantly reducing latent heat exchange efficiency.

In addition, as shown in Figure 3, the heat storage rotary type has a honeycomb structure in which corrugated substrates 6 and flat substrates 7 are alternately laminated in the circumferential direction, and in this case as well, bacteria are not included in the airflow. If the equipment is in use, bacteria may form on the surface of the circuit board, multiply while the equipment is stopped, and then return to the room when the equipment is restarted, causing problems.

OBJECTS OF THE INVENTION The present invention provides a total heat exchanger that prevents bacterial growth and allows sanitary and safe ventilation while maintaining high latent heat exchange efficiency.

DESCRIPTION OF THE INVENTION According to the present invention, heavy metals are included or attached to the material constituting the total heat exchanger.

DESCRIPTION OF EMBODIMENTS An embodiment based on the present invention will be described below. Figure 4 shows a partition plate of a static permeation total heat exchanger which is an embodiment of the present invention.
is attached. Heavy metals include tin (Aq) and copper (C
u), zinc (Zn), cadmium (Cd), mercury (
) IcI) etc. are used, and their states include metal alone,
These include metal salts or metal oxides such as chlorides and nitrates.

In order to confirm the effects of the present invention, Li as a hygroscopic substance was
Using a partition plate made of bleached kraft paper to which eβ has been added, we sprayed bacteria and tested how the state of bacterial growth changed depending on whether there was a side door containing heavy metals. Although the reproduction increased, AqCCCu O12 was added by 1wt to the weight of the partition plate.
% addition, mortality decreased.

Furthermore, when a heavy metal-containing substance was added to the substrate of a regenerative rotary total heat exchanger, no increase in bacterial reproduction was observed and the bacteria were killed, and the same effect as in the above case was observed.

Effects of the Invention As described above, according to the present invention, by attaching heavy metals directly or a heavy metal-containing substance to the total heat exchange element material, the proliferation of bacteria can be prevented due to its sterilizing effect.
It is possible to provide a total heat exchanger that can be used in hospitals and the like.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a static transmission type total heat exchanger, Fig. 2 is a partial sectional view of a conventional partition plate, Fig. 3 is a schematic diagram of a regenerative rotary type total heat exchanger, and Fig. 4 is a schematic diagram of the present invention. It is a partial sectional view of the partition plate in the total heat exchanger of one Example. 1.4... Partition plate, 2... Spacing plate, 3
... Pore, 5 ... Hygroscopic substance, 8 ...
...Substances containing heavy metals.

Claims (4)

[Claims] (1) A total heat exchanger in which at least a part of the total heat exchange element material contains heavy metals. (2) The total heat exchanger according to claim 1, wherein heavy metals are supported on at least a portion of the static permeation type total heat exchange element material whose partition plates are made of a material having heat conductivity and moisture permeability. (3) The total heat exchanger according to claim 1, wherein at least a portion of the rotary total heat exchange element material supports heavy metals. (4) Heavy metals include silver, copper, zinc, and cadmium. The total heat exchanger according to claim 1, characterized in that at least one type of mercury is used.