Dehumidifying air conditioning system

A technology for air conditioning systems and dehumidifiers, which is applied in air conditioning systems, air treatment details, space heating and ventilation, etc., and can solve problems such as changes, changes in dehumidification performance of supply air, and large-scale dehumidification systems.

Inactive Publication Date: 2007-07-18
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of cooling heat supplied to the air varies greatly due to temporal and seasonal fluctuations in the outside air temperature.
For this reason, there is a problem that once the heat pump is cycled according to this change, the heating amount of the exhaust air also c

Method used

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Examples

Experimental program
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Embodiment 2

[0062] Next, another embodiment of the present invention will be described with reference to FIGS. 4 to 7 . FIG. 4 is an overall system diagram of the dehumidification and air conditioning system according to the present embodiment, and FIG. 5 is a diagram showing the heat pump cycle used in the present embodiment on a temperature-enthalpy diagram. 6 is a graph showing the relationship between the temperature efficiency of the internal heat exchanger used in the present example and the power consumption and the like of the dehumidifying air-conditioning system according to the present example. FIG. 7 is a graph comparing the energy consumption of the dehumidifying and air-conditioning system according to the present embodiment and the details thereof with the three systems in FIG. 3 . In the respective figures, the same reference numerals as those in FIG. 1 are attached to the same components as those in the embodiment of FIG. 1 . In addition, in the following description, it...

Embodiment 3

[0080]The third embodiment will be described using FIGS. 8 to 12 . FIG. 8 is an overall system diagram of the dehumidification and air conditioning system according to the present embodiment. FIG. 9 is a diagram showing the heat pump cycle used in this example on a temperature-enthalpy diagram. FIG. 10 is a diagram showing the cell structure of the present embodiment. In addition, FIG. 11 is a detailed diagram comparing the energy consumption in the summer peak condition of the dehumidifying air-conditioning system according to the present Example and the details thereof with the case of using the heat pump. In addition, FIG. 12 is a graph comparing the monthly average energy consumption according to the present Example with the case where the heat pump is not used like FIG. 10 .

[0081] In FIG. 8 , the difference from FIG. 1 is that an on-off valve 83 is provided on the direct expansion cooling coil (first cooling coil) 81 which is the output of the refrigerator 80 to cool...

Embodiment 4

[0108] Next, a fourth embodiment of the present invention will be described with reference to FIG. 13 . The dehumidification and air-conditioning system of FIG. 13 has substantially the same configuration as that of FIG. 8, but differs in the following points. In the embodiment of FIG. 8 , the indoor return air 94 recirculated from the room is cooled by the second cooling coil 82 . In contrast, in the present embodiment, the second cooling coil 82 is used to cool the indoor air 94 . The process air in which the return air 94 and the outside air 91 introduced from the outside have merged is cooled.

[0109] In the present embodiment, the process air before flowing into the process area 11 of the dehumidification rotor 10 is cooled by the second cooling coil 82 . As a result, compared with the third embodiment, the rotor inlet air temperature detected by the temperature sensor 39 can be stably controlled to be close to the target value by the capacity control of the refrigerato...

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Abstract

In a dehumidifying system using a desiccant dehumidifier, regeneration air at the desiccant dehumidifier is heated by the condenser of a heat pump or a gas cooler, indoor return air re-circulated from an air-conditioned indoor to a dehumidifying rotor is cooled by an evaporator. Since the cooling load of indoor return air is almost stable during operations, the size of a heat pump unit is made small as compared with outdoor air cooling by setting the capacity of the heat pump to match this cooling load to thereby reduce initial costs. Furthermore, the heat pump can be operated at an almost maximum capacity throughout operating periods to provide a stabilized energy saving effect.

Description

technical field [0001] The present invention relates to a dehumidifying air-conditioning system which is based on a desiccant air conditioner and includes a heat pump as its air heating / cooling mechanism. Background technique [0002] As a dehumidification air-conditioning system which concerns on this invention, the technique described in Unexamined-Japanese-Patent No. 2005-34838 is mentioned, for example. In this publication, a desiccant rotor serving as a heat pump and a moisture absorption and desorption mechanism is provided as a cooling medium circuit, the air to be dehumidified is heated by the radiator of the heat pump, and the moisture is released in the desiccant rotor. The air is humidified in the zone, cooled by the heat absorber of the heat pump, and dehumidified in the dilution zone of the desiccant rotor. In addition, in this known example, the cooling medium of the heat pump radiates heat at supercritical pressure in the radiator, and carbon dioxide is used ...

Claims

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Application Information

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IPC IPC(8): F24F3/00F24F3/147
CPCF24F2203/1088F25B2309/061F24F2203/1068F24F2203/106F24F2203/1032
Inventor 藤居达郎今成正雄高桥稔杉浦匠头岛康博福井伊津志
Owner HITACHI LTD
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