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3. SYSTEM DESIGN GUIDE
WR2
MEE15K052
3. SYSTEM DESIGN GUIDE
3-1. Designing of water circuit system
1) Example of basic water circuit
1) Example of basic water circuit
The water circuit of the water heat source HYBRID CITY MULTI connects the heat source unit with the cooling
tower/auxiliary heat source/heat storage tank/circulation pump with a single system water piping as shown in the
figure below. The selector valve automatically controls to circulate water toward the cooling tower in the cooling
season, while toward the heat storage tank in the heating season. If the circulation water temperature is kept in a
range of 10~45°C [50~113°F] regardless of the building load, the water heat source HYBRID CITY MULTI can be
operated for either cooling or heating. Therefore in the summer when only cooling load exists, the temperature rise
of circulation water will be suppressed by operating the cooling tower. While in the winter when heating load
increases, the temperature of circulation water may be dropped below 10°C [50°F]. Under such situation, the
circulation water will be heated with the auxiliary heat source if it drops below a certain temperature.
When the thermal balance between cooling and heating operation is in a correct proportion, the operation of the
auxiliary heat source and cooling tower is not required.
In order to control the above thermal balance properly and use thermal energy effectively, utilizing of heat storage
tanks, and night-time discounted electric power as a auxiliary heat source will be economical.
Meantime as this system uses plural sets of heat source unit equipped with water heat exchangers, water quality
control is important. Therefore it is recommended to use closed type cooling towers as much as possible to prevent
the circulation water from being contaminated.
When open type cooling towers are used, it is essential to provide proper maintenance control such as that to install
water treatment system to prevent troubles caused by contaminated circulation water.
E.H
S.T
T
T
C.T.P
C.T
P
3-way valve
Example of basic water circuit for water heat source HYBRID CITY MULTI
S.T
: Heating tank
(Heat storage tank)
C.T
: Cooling tower
C.T.P : Cooling water pump
P
: Circulation water pump
T
: Thermostat for water
E.H
: Electric heater
: Heat source unit for cooling
operation
: Heat source unit for heating
operation
The indoor unit and refrigerant piping system are excluded in this figure.
0000003905.BOOK 49 ページ 2016年1月25日 月曜日 午後2時45分
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