O-44

Y3Keywords

equipment or facility

Z4electricity

DConstruction
SANKEN SETSUBI KOGYO CO., LTD

Latent Heat Sensible Heat Separation Air Conditioning System
Capable of Utilizing Renewable EnergyFeatures
Highly efficient energy conservation performance is possible with the use of aluminum slit-type radiation
panels with good load responsiveness for indoor sensible heat treatment. The cold water temperature of16℃ - 20℃ and hot water temperature of 28℃ - 38℃ for these radiation panels are close to the indoor
environment, and these can be operated without the need for heat pumps with the direct use ofrenewable energy such as geothermal, solar energy, etc.
The use of renewable energy, desiccant units (DC) for waste heat utilization, or sensible heatexchangers (SHEX) for outside air latent heat treatment creates a comfortable indoor humidity
environment with a supply of outside air with an absolute humidity of 8g/kg or less.
This radiation panel air conditioning system creates an optimal human-friendly indoor environment byusing our proprietary controller to control the indoor ring environment index PMV (predicted mean vote)without controlling the room temperature. This latent heat sensible heat separation air conditioning
system also forms an essential part of ZEB (zero energy building) technologies to minimize airconditioning energy consumption.

Plan View
Metal reinforced polyethylene pipe
Inner diameter 12.1mm Outer diameter 16.1mm
12mm thick aluminum

A-A Cross-section
Aluminum panel →Good thermal conductivity, lightweight
Slits between panels → Natural convection effect* The radiation panels are bent to promote an expansion of radiation area and natural convection throughslits, making it possible to provide a higher cooling capacity which is about 130% of general radiation
panel products and to minimize the installation area.
Basic Concept or Summary
The renewable solar energy and geothermal heat utilization system is shown below.
Renewable Energy Heat Source

Sensible Heat Treatment

Latent Heat Treatment
Sensible Heat Treatment System Flow
Latent Heat Treatment
System (Aux.)

Air Supply

ReturnOutside Air
Coil Use (Pre-cooling/heating)Ceiling Radiator Panels

Pumping Well

Reduction Well

Air Supply

Exhaust

HP: Water-Cooled Chiller; HEX: Heat Exchanger;
HST: Solar Power Heat Storage Tank; PH: HotWater Pump; PCH: Cold/Hot Water Pump;
PW: Power Heat Pump;
AHU: Air Handling Unit; AHEX: Air Heat Exchanger;
PAC: Air Heat Pump Air Conditioner;
HM: Drop Pervaporation Humidifier;
DC: Desiccant Coil System

Pre-cooling CoilOutsideAir

Exhaust
350 m3/hCorridor

Ceiling Radiation Panels

2F Office Area
（20 person capacity）
190 m2AtriumGroundwater
Solar Heated Water
ExhaustDesiccant Coil Unit

Air Supply
500 m3/h

The DC alternately flows through 18°C cold water and 55°C hot water to two adsorption coil units,
supplying dehumidified outside air of 26°C or less with an absolute humidity of 8g/Kg or less without
producing indoor sensible heat load. (Pre-cooling coil cold water temperature of 18°C)
The SHEX System cools and dehumidifies and reheats using an aluminum sensible heat exchanger.
The cooling and dehumidification capacity of the heat pump equipment supplies cooled and dehumidified
outside air with about 60% of normal capacity.
* This system provides a heat pump backup when renewable energy cannot be used.

Effects or Remarks

O-44

Energy-saving with sensible latent heat separation air conditioning
Conventional Air Conditioning
Total Load 100

Latent/Sensible Heat Separation
Air Conditioning

Latent/Sensible Heat Separation
Air Conditioning

Latent/Sensible Heat Separation
Air Conditioning

Separate Temp. And Humidity Treatment

Separate Temp. And Humidity Treatment

Separate Temp. And Humidity Treatment

Total Load 100

Batch Temp. and Humidity Treatment
Temperature Ratio
70

Humidity Ratio
30

Heat Source
7°C Cold Water

33.3
Energy Consumption
Total 33.3kW

Temperature Ratio
70

Humidity Ratio
30

Heat Source
16°C Cold Water

Heat Source
7°C Cold Water

10.8

Total Load 100

Humidity Ratio
30

Temperature Ratio
70

1218Heat Source
16°C Cold Water

10.0

12.6

Energy Consumption

Desiccant

4.3

Energy Consumption

Total 20.8kW

Total 16.7kW

38% Energy Reduction

50% Energy Reduction

Total Load 100

Temperature Ratio
70

Humidity Ratio
30
12Heat Source
16°C Cold Water

4.1

18
Desiccant

2.5

Energy Consumption

Total 6.6kW

80% Energy Reduction

By using 16℃ cold water in sensible heat treatment, 38% energy savings can be achieved with theimprovement of heat source COP. The use of waste heat DCU for latent heat treatment gives an energy
saving of 50%, and the further use of geothermal heat applied directly to the 16℃ cold water can produce
an energy saving of 80%.
In addition, the use of radiant panel air conditioning is more energy efficient in terms of heat transfer thanconventional convection air conditioning. (Specific Heat – Water:Air 4.19:1 KJ/(kg/K))
Installation in Practice or Schedule
Domestic(Tsukuba Mirai TC)(Sapporo Branch)(Kyoto City Office)・ Sanken Setsubi Tsukuba Mirai Technology Center ZEB (Design and Construction: Sanken SetsubiKogyo) ZEB Achieved Mar. 2014
Awards: 2nd Society of Heating, Air-Conditioning and Sanitary Engineers of Japan Awards
Renewal Award
Advanced Technology Introduction Award from the 2014 Environment Minister's Award for
Global Warming Prevention Activities
Carbon Neutral Award, 3rd Japanese Association of Building Mechanical and ElectricalEngineers Awards
Sustainable Architecture Jury Encouragement Award, 6th Institute for Building Environment
and Energy Conservation Awards

・ Sanken Setsubi Sapporo Branch Office ZEB (Design and Construction: Sanken Setsubi Kogyo)
Completed Nov 2018
Awards: Outstanding Performance Award at the 2018 METI Hokkaido Bureau of Economy, Trade andIndustry Northern Energy Conservation/New Energy Awards
2018 Illumination Promotion Award (Hokkaido Area), Illuminating Engineering Institute ofJapan
9th Carbon Neutral Award (Hokkaido Branch) of the Japanese Association of Building
Mechanical and Electrical Engineers
Special Award from Judging Committee of the FY2021 Energy Conservation Grand PrizeAward, Energy Conservation Center, Japan・ Kyoto City Office (Design: Nikken Sekkei Ltd.; Construction: Sanken/Meiwa JV) Completed May 2019
Sensible latent heat separation radiant air conditioning area of about 4,000㎡ (No slit typeradiation panels)
Awards: Prize of the Chairman of ECCJ of the FY2022 Energy Conservation Grand Prize Award,
Energy Conservation, Japan
61st SHASE Award for Distinguished Technologies (Architectural Equipment Category),
Society of Heating, Air-Conditioning and Sanitary Engineers of Japan
11th Carbon Neutral Award (Kinki Branch) of the Japanese Association of Building
Mechanical and Electrical Engineers

Overseas

Completion of renovation work at Zero Energy Plus Building of BCA Academy in Singapore in Sep. 2020

Contact:

SANKEN SETSUBI KOGYO CO., LTD
17-21 Shinkawa 1-Chome, Chuo-ku, Tokyo
Tel: +81-3-6891-0016 Fax: +81-3-5540-3261
URL: https://skk.jp/en/corporate/