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Application of Desiccant Heating, Ventilating, and Air-Conditioning System in Different Climatic Conditions of East Asia Using Silica Gel (SiO2) and Titanium Dioxide (TiO2) Materials

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Desiccant Heating, Ventilating, and Air-Conditioning Systems

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Abstract

This chapter shows the numerical investigation of the developed solar–DHVAC system applied in the East Asian climatic conditions with two different desiccant wheel coating materials—the Silica Gel (SiO2) and the Titanium Dioxide (TiO2). The system was applied in temperate climate (Beijing and Tokyo), subtropical climate (Taipei and Hong Kong) and tropical climate (Manila and Singapore). The study showed that the specification of the solar–DHVAC system varies depending on the climatic conditions. In the comparison of the two materials, it was found that the TiO2 can support lower indoor temperature and humidity ratio than the SiO2 with the same specification of the solar thermal system and DHVAC system. In general, the solar–DHVAC system can provide the required indoor temperature and humidity ratio. However, for the hot and humid climate such as in tropical, large size of the solar thermal system is needed. In addition, higher volumetric flow of air to support the high cooling load is required.

This chapter is a modified version of our paper [1].

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Abbreviations

C P :

Specific heat (kJ/kg-K)

DHVAC:

Desiccant heating, ventilating and air-conditioning

DCOP:

Desiccant coefficient of performance (-)

E :

End

EA :

Exit air

E F,1 :

Electric energy consumption of fan 1 (kJ)

E F,2 :

Electric energy consumption of fan 2 (kJ)

E H,1 :

Electric energy consumption of heater 1 (kJ)

E H,2 :

Electric energy consumption of heater 2 (kJ)

E OP :

Off-peak electric energy consumption (kJ)

E P :

Peak electric energy consumption (kJ)

E P,1 :

Electric energy consumption of pump 1 (kJ)

E P,2 :

Electric energy consumption of pump 2 (kJ)

h :

Moist air enthalpy (kJ/kg)

H Con :

Latent heat of condensation (kJ/kg)

I Cur :

Electric current (A)

m :

Mass flow (kg/s)

OA:

Outdoor air

OPEC:

Off-peak electric energy consumption (-)

PA:

Processed air

Q CL :

Cooling load (kJ)

Q H,1 :

Thermal energy supplied by electric heater number 1 (kJ)

Q H,2 :

Thermal energy supplied by electric heater number 2 (kJ)

Q LE :

Latent energy (kJ)

Q L,1 :

Thermal energy load number 1 (kJ)

Q L,2 :

Thermal energy load number 2 (kJ)

Q SC :

Solar energy collected (kJ)

Q SE :

Sensible energy (kJ)

RA:

Return/room air

S :

Start

SF:

Solar fraction (-)

SCOP:

System coefficient of performance (-)

SHR:

Sensible heat ratio (-)

t :

Time (s)

T :

Temperature (°C)

TCOP:

Thermal coefficient of performance (-)

U :

Over-all heat transfer coefficient (W/m2K)

V ol :

Electrical voltage (V)

X :

Humidity ratio (kgH20/kgAir)

A :

Air

CE:

Cooling effect

CL:

Cooling load

Col:

Collector

I :

Inlet

O :

Outlet

OA:

Outdoor air

SA:

Supply air

1..12 :

State points

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Author information

Authors and Affiliations

  1. Building Research Institute, Tsukuba, Japan

    Napoleon Enteria

  2. Tohoku University, Sendai, Japan

    Hiroshi Yoshino, Akashi Mochida & Hiroshi Yonekura

  3. Maeda Corporation, Tokyo, Japan

    Akira Satake

  4. Tokyo Polytechnic University, Atsugi, Japan

    Ryuichiro Yoshie

  5. Akita Prefectural University, Akita, Japan

    Rie Takaki

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  1. Napoleon Enteria
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  2. Hiroshi Yoshino
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  3. Akashi Mochida
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  4. Akira Satake
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  5. Ryuichiro Yoshie
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  7. Hiroshi Yonekura
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Correspondence to Napoleon Enteria .

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Editors and Affiliations

  1. Building Research Institute, Tsukuba, Ibaraki, Japan

    Napoleon Enteria

  2. University of Reading, Reading, Berkshire, United Kingdom

    Hazim Awbi

  3. Tohoku University, Sendai, Miyagi, Japan

    Hiroshi Yoshino

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Enteria, N. et al. (2017). Application of Desiccant Heating, Ventilating, and Air-Conditioning System in Different Climatic Conditions of East Asia Using Silica Gel (SiO2) and Titanium Dioxide (TiO2) Materials. In: Enteria, N., Awbi, H., Yoshino, H. (eds) Desiccant Heating, Ventilating, and Air-Conditioning Systems. Springer, Singapore. https://doi.org/10.1007/978-981-10-3047-5_11

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  • DOI: https://doi.org/10.1007/978-981-10-3047-5_11

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