Keywords

Y3

Equipment or facility

Z4Electric power

S3

Construction industry
Sanken Setsubi Kogyo Co., Ltd.

Dehumidifying air supply unit with
“Zero Energy Consumption Precooling and Reheating”

Features

S The “ECOSALA®” dehumidifying air supply unit features a unique cooling, dehumidifying and reheating
system, which uses the heat from the outdoor air with high temperature for reheating outdoor air that iscooled through the cooling and dehumidifying process, thereby offsetting the energy for precooling andreheating to make this a unit that features zero energy consumption precooling and zero energy
consumption reheating.
S This is an all-in-one unit that incorporates all necessary components, including instrumentations,control panel, inverter panel and the like, with the test operation completed at the manufacturing plant,
to facilitate an implementation that is completed in a short period and save labor for local installation
work.
S The control system employs an open system utilizing ICT that can be introduced regardless of existing
equipment manufacturers.
S The system also features a multi-function touch-screen monitor, offers visualization of air conditions
and real-time display of energy reduction rates.
S The system is also equipped with a multi-site remote monitoring system that facilitates sharing of same
screen displays with smart phones and computers, to facilitate easier commissioning and maintenancework after implementation of the system.
Temperature and humidity (summer cooling 1)

Temperature and humidity (summer cooling 1)
ON/OFFswitch

After precooling withsensible heatexchange

OA

After coilcooling

SOA

ON/OFFswitchRA

Air line
diagram

Air line
diagramStatusStatusTemperature andhumidity settings

Controlsettings

ecificSp

lpythaen]A)

Dg(J/k[KAbsolute humidity [kg/kg (DA)]

Re]

H [%

ity Rumidehlativ

B

Coil cold water

DSOAC

After precooling withsensible heat exchange

After coilcooling

RAAir supply fan
OperatingTemperature andhumidity settings

Energy saving rate

Exhaust pressure
Controlsettingsl Provides visualization of air conditions(in real time).

Fan

Dehumidification quantity calculation

Sensibleheatexchanger

Dehumidification quantity
Cooling heat
quantity
Reheatingquantity

Dry bulb temperature [°C]

OutdoorairAOA

CoilProcessing heat quantityl Displays energy reduction rates(in real time).

Fan

Same screen display is shared forimprovement method considerations

Freezing prevention

Air supply

ECOSALA SOAIndoor

Control panel on unit
CoilSensible heat exchangerl Incorporates everything that is needed for operation,
including the power board and the like.
The “ECOSALA®” all-in-one unitl Supports multi-site remote monitoring.

Overview or Principles
Outdoor air (OA)

Air supply (SOA)

OutdoorMuggyIndoor
Dry andcomfortable

BlowerSecondary cooling anddehumidifying withcooling coil(using 7°C cold water)

Zero energyconsumption
precooling
Cooling anddehumidifying

icSp

ifec

Temporary cooling anddehumidifying withsensible heat exchanger(zero energy consumption)

yalpthen

Coil inlet

Outdoorair• Indoors
Cooling coil

Sensible heatexchanger

Zero energy
consumption
reheating

SOA (low-humidity
Coil outlet
external air)Reheating with sensible heatexchanger (zero energy consumption)

Absolute humidity [g/kgDA]

O-45

Dry bulb temperature [°C]l Air flow and air line diagrams for ECOSALA

Air flow of ECOSALA is shown. The external air ① is precooled by exchanging sensible heat of the outlet
air ③. The cold water coil outlet air ③, which is the inlet air ② cooled and dehumidified by the cold watercoil, is reheated by sensible heat exchange with the external air ①, to supply low humidity air ④ to theinterior. The energy required by ECOSALA is limited to cooling and dehumidifying with the cooling coil,since primary cooling and dehumidifying, as well as reheating that occurs along the line from cooling coiloutlet and thereafter are performed by sensible heat exchanger with zero energy consumption.

Primary energy consumption

Effects or Remarks

O-45

Total dehumidification returns
for May through October
Conventional system: 2425GJ/year
Installed system:
535GJ/year (78% reduction)

Gas
66

77%
reduction
78%
reduction

78%
reduction

78%
reduction

79%
reduction

May

Electricpower
5379%
reduction

June

July

78%
reduction

AugustSeptemberOctober

Conventionalsystem

Electric power with conventional system
Gas with conventional system
Electric power with installed system

Electricpower
26
Installedsystem

Carbon dioxide emissions

l Monthly energy reduction effects fromthe installation of ECOSALA®

l Carbon dioxide reduction effect fromthe installation of ECOSALA®

A sensible heat exchanger is used to perform zero energy consumption primary cooling and zero energy
consumption reheating, to achieve a reduction of energy for cooling by 30% (for external air conditions of34.3°C and 68% relative humidity) and 100% for reheating all entirely by the single unit of ECOSALA. An
implementation case example at a food processing plant confirmed an annual reduction of energy by atotal of 1,890GJ/year or a 78% reduction for primary energy consumption during the dehumidifying period,with the ECOSALA system reducing the prior consumption of 2,425GJ/year to 535GJ/year. The reduction
is 78% for the From the perspective of environmental conservation, .carbon dioxide emission, which isthought to be the cause for global worming, is reduced by 78%. This means that a significant contribution
is made to achieve carbon neutrality by effectively using the high temperature of the air in the atmosphere,
which is a renewable energy.
• “ECOSALA®”
Received award: The 2021 Energy Conservation Grand Prize from the Energy Conservation Center, Japan.
The Energy Conservation Center Chairman’s Award in Product and Business Model Division(Award winning topic: Energy conserving air conditioning solution with a dehumidifying and air supplying
unit that achieves a “zero energy consumption precooling and reheating”)
Installation in Practice or Schedule
Domestic

Plant A at Meiji Co., Ltd.
Dedicated fordehumidification: 8,000 m3/h
Installation completed inOctober, 2019

Tsukuba-Mirai Technology Center,Sanken Setsubi Kogyo Co., Ltd.
Dual use for dehumidification andhumidification: 2,000 m3/h
Installation completed in January, 2021

Saitama Technology Center, Sanken
Setsubi Kogyo Co., Ltd.
Dual use for dehumidification andhumidification: 4,200 m3/hInstallation completed in March, 2022

• Plant B at Meiji Co., Ltd.
Installation completed in June, 2022; exclusive use for dehumidification: 10,500 m3/h
• New R&D Building at Eiken Chemical Co., Ltd.
Installation completed in July, 2022; dual use for dehumidification and humidification: 6,750 m3/h
• Plant C at Meiji Co., Ltd.
Installation completed in February, 2023; exclusive use for dehumidification: 12,000 m3/h
• Plant A at Meiji Co., Ltd.
Implemented, exclusive use for dehumidification: 6,000m3/h• A supermarket
Implementation planned, dual use for dehumidification and humidification: 12,000m3/h• Plant C at Meiji Co., Ltd.
Implementation planned, exclusive use for dehumidification: 15,000m3/h

Contact:

Sanken Setsubi Kogyo Co., Ltd.
Development Group, Engineering Management Division
Mail: kaihatsu@skk.jp
URL: https://skk.jp/contact/