TYPE 205 - SERPENTINE COLLECTOR

This Type models a serpentine collector with N rows of parallel tubes. Below are listed the 
PARAMETERS, INPUTS and OUTPUTS for the collector model. As a number of the inputs require temperature dependent properties of the fluid to be known, Type188 was written to provide such data and can be used in conjunction with this Type.

PARAMETERS		DESCRIPTION
1	N		number of turns	
2	D_i		inner tube diameter (m)
3	D		outer tube diameter (m) 
4	delta		plate thickness (m)
5     L		length of each turn (m)
6     W		tube spacing (m)
7	k		plate conductivity (kJ/m^2-K)
8	U_be		loss coefficient from back and edge of collector per unit aperture area (kJ/m^2-K)
9	E_p		absorber plate emmitance
10	Alpha		absorber plate absorptance	
11	N_G		number of glass covers
12	RefInd	refractive index of glass covers
13	XKL		product of extinction coefficient and thickness of cover plates (m/m)


INPUTS		DESCRIPTION
1	T_in		temperature of fluid entering collector (C)
2	m_dot		mass flowrate of fluid entering collector (kg/hr)
3	T_a		abient temperature of collector surroundings (C)
4	I_T		Radiation incident on collector surface (kJ/hr-m^2)
5	wind		wind speed (m/s)
6	I_h		total radiation on horizontal surface (kJ/hr-m^2)
7	I_d		diffuse radiation on horizontal surface (kJ/hr-m^2)
8	rho_g		ground reflectance
9	theta   	incidence angle of beam radiation (degrees)
10	beta		collector slope (degrees)
11	mu     	dynamic viscosity (N-s/m^2)
12	C_p		specific heat of collector fluid (kJ/kg-K)
13	kw		fluid thermal conductivity (kJ/hr-m^2)
14	rho     	fluid density (kg/m^3)


OUTPUTS		DESCRIPTION
1	T_out		temperature of fluid exiting collector (C)
2	m_dot		mass flowrate of fluid exiting collector (kg/hr)
3	Q_useful	rate of energy gain from collector (kJ/hr)
4	T_pm		mean absorber plate temperature (C)
5	F_R		collector heat removal factor 
6	TauAlpha	transmittance-absorbtance product
7	P_loss	pressure loss (kPa)
8	U_L		overall heat loss coefficient (kJ/hr-m^2)