TY - GEN AU - Jin B Fang C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1986-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.86-3381 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1986 TI - Minimum life cycle cost heat losses for shallow trench underground heat distribution systems: ER -