A Modelling and Control Approach for a Type of Mixed Logical Dynamical System Using in Chilled Water System of Refrigeration System

Table 2

Thermal parameters and control coefficients.

Parameter	Value	Description
(kg)	301.83	indoor air mass
(kg/s)	0.03	constant of switchable pump
(kg/s)	0.02	rated volume of variable frequency pump
(kg/s)	0.1	constant volume of whole fixed pumps
(kg/s)	0.635	constant volume of sending air
(m^2)	68	area of walls
(m^2)	22	area of windows
(m^2)	6	area of roof
(J/kgk)	1010	specific heat of air
(J/kgk)	4180	specific heat of water
	3	amount of switchable pumps
(W/m^2k)	0.049	heat transfer coefficient of walls
(W/m^2k)	0.051	heat transfer coefficient of windows
(W/m^2k)	0.05	heat transfer coefficient of roof
(J)	70	latent heat load
	0.13	return air rate
(°C)	5	temperature difference
	0.88	transfer efficiency from water system to air system
	0.082	coefficient of cooling capacity allocation
	0.00032	coefficient of feedback control
(°C)	35, 35, 36	initial temperature
(°C)	35, 35, 36	temperature of walls, windows, and roof, respectively
(°C)	19.5	setting temperature
(kW)	35	power of whole fixed pumps
(kW)	37	power of switchable pump
(kW)	75	rated power of variable frequency pump